Entries |
Document | Title | Date |
20080231219 | MOTOR DRIVE APPARATUS AND MOTOR DRIVE METHOD - To reduce noise by limiting a current peak value to a predetermined value or less and by smoothing the waveforms of drive currents during the current limitation, switching control means ( | 09-25-2008 |
20080252245 | Motor Driving Circuit Having Low Current Consumption under a Standby Mode - A power cutter, an oscillator, a counter, a S-R latch, and a Hall bias are further disposed inside a DC motor driving circuit so that current consumption of the DC motor driving circuit is reduced significantly under a standby mode. When the counter detects that a received pulse width modulation signal stays at a low electrical level over a predetermined time, the counter triggers the S-R latch so as to activate a disabling signal of the power cutter for shutting down most elements until the pulse width modulation signal returns to a high electrical level. With the aid of the built-in Hall bias, space for externally coupling the Hall bias is saved, and moreover, a Hall sensor retrieves a dynamically-adjusted power and currents so that remarkable current consumption is saved under a standby mode. | 10-16-2008 |
20080272725 | Load Monitor - A load monitor for monitoring the load of a motor comprises a Central Processing Unit (CPU) and a memory. During normal operation of the motor, the load monitor is arranged to repeatedly measure the torque and registering the speed of the motor. In connection with each measurement of the torque and registering of the speed, the load monitor determines a load limit value valid for the registered speed, which load limit value is a function of a plurality of torques and speeds and a predetermined deviation value stored in the memory. The measured torque is then compared with the determined load limit value and if the measured torque is not within an acceptable range limited by the determined load limit value then an appropriate action is taken. | 11-06-2008 |
20080284362 | Adjusting Device and Control Device of a Vehicle - The invention relates to a control device of a vehicle seat for controlling a first drive and a second drive and for detecting jamming of a body part or of an object by means of an adjusting movement of an adjusting part, which can be adjusted in a first adjusting direction by means of the first drive and in a second adjusting direction by means of the second drive, of the vehicle seat, wherein the control device is configured to detect the jamming by means of a combined evaluation of at least one first force variable which is dependent on the adjusting movement and of a second force variable which is dependent on the adjusting movement. | 11-20-2008 |
20080290828 | SYSTEM AND METHOD FOR DETECTING A STALLED MOTOR - A system for detecting when a motor is stalled. The system including a voltage driving circuit and a voltage sensing circuit. The voltage driving circuit providing a driving signal to the motor through a connection node. The voltage driver circuit being configured to disconnect from the connection node while the voltage sensing circuit determines if the motor is stalled. A voltage sensing circuit determines if the motor is stalled based on a generated voltage that occurs if the motor is not obstructed and continues to spin when the voltage driver circuit is disconnected. | 11-27-2008 |
20080297085 | MOTOR DRIVER SYSTEM AND METHOD FOR PROTECTING MOTOR DRIVER - A motor driver system includes an inverter configured to apply a three-phase voltage to a motor; an inverter driver configured to generate a reference voltage to the inverter to control a motor speed to follow a reference speed; and a motor protector configured to control the inverter driver so that a value of the reference voltage is equal to or lower than a predetermined voltage value. | 12-04-2008 |
20080303465 | DRIVE CONTROL SYSTEM OF AN ELECTRIC VEHICLE - The object of the present invention is to provide a drive control system of an electric vehicle that can prevent overshoot of the amount of slip. The drive control system of the electric vehicle includes: a motor to drive a driving wheel; a PDU; a number-of-revolution sensor that detects the number of revolutions of the motor; a grip number of revolutions calculating means | 12-11-2008 |
20080315814 | Motor Control Device, Motored Vehicle Equipped Therewith, and Method of Controlling a Motor - When a motor temperature exceeds a threshold value, a torque control unit reduces a torque control value for a motor generator. A torque limitation control unit determines from torque control value and vehicular speed whether limiting a torque by the torque control unit should be alleviated, and if so the torque limitation control unit activates a signal for a predetermined period of time. When the signal is activated, the torque control unit stops reducing the torque control value and fixes the torque control value to be constant. | 12-25-2008 |
20090009120 | SIGNAL INPUT METHOD AND OPENING/CLOSING CONTROLLER - It is intended to realize a signal input method which makes it possible to add another method to an existing method later in a simple manner as well as an opening/closing controller which employs two methods and can be constructed by adding another method to an existing method in a simple manner. | 01-08-2009 |
20090033265 | Monitoring Unit for Monitoring the Load of an Electric Motor - A monitoring unit is disclosed for monitoring the load of an electric motor. In at least one embodiment, the monitoring unit provides for the motor load to be monitored over the entire torque range. For this purpose, the monitoring unit uses linearizing matching of the indication variable. First, the monitoring unit is provided for detecting a motor current and a phase angle between the supply voltage and the motor current in the operating state of the motor. Furthermore, it includes at least one device for forming an indication variable from the motor current and the phase angle as a measure for monitoring the electric load of the motor. | 02-05-2009 |
20090039811 | Inhibitors of HSP90 - The invention relates to the use of 1H-indazol-6-ol compounds and salts thereof in the treatment of proliferative diseases and for the manufacture of pharmaceutical preparations for the treatment of said diseases, pharmaceutical preparations comprising 1H-indazol-6-ol compounds, novel 1H-indazol-6-ol compounds, and a process for the preparation of the novel 1H-indazol-6-ol compounds. | 02-12-2009 |
20090039812 | MOTOR DRIVE DEVICE - The present invention presents a motor drive device capable of detecting jamming accurately without falsely detecting jamming when a movable part contacts with other members. Jamming by a backrest is detected by judging whether the value of a period of one pulse P | 02-12-2009 |
20090039813 | METHOD AND APPARATUS FOR CONTROLLING ELECTRIC MOTOR - A method for controlling a motor current supplied to an electric motor by using an inverter device is provided. The inverter device includes an inverter circuit and a capacitor connected to an input of the inverter circuit. The method includes controlling the inverter circuit in such a manner as to supply an alternating electric current to the electric motor after the temperature of the capacitor reaches a temperature at which a maximum acceptable motor current value becomes greater than or equal to a value at which the torque necessary for starting the electric motor is produced. | 02-12-2009 |
20090039814 | Trapping Prevention Guard and Method for Controlling a Motor-Driven Adjusting Device - In order to reliably detect a jamming situation, in particular in a seat adjusting means, provision is made for a total loading exerted by the drive during a start phase to be determined and for this to be fixed as the basic loading. The existence or non-existence of a jamming situation is finally determined during a monitoring phase by comparing the gasinc loading and the total loading that varies during operation of the adjusting apparatus. | 02-12-2009 |
20090051306 | Electric power tool, control unit and recording medium - An electric power tool includes a direct current motor, at least one switching device, a trigger switch, a control unit, and a drive unit. The control unit sets a driving duty ratio for PWM controlling the direct current motor so as to increase the driving duty ratio in a stepwise manner in accordance with an operation continuation time of the trigger switch during a period from when an operation of the trigger switch is started until when a predetermined start-up time has elapsed. | 02-26-2009 |
20090058340 | Closure panel control apparatus - A controller computes a pinching amount of an object caused by a window glass. The controller estimates a prior pinching amount of the object caused by the window glass before the controller computes the pinching amount of the object. The controller confirms occurrence of the pinching of the object based on the computed pinching amount and the estimated prior pinching amount of the object. | 03-05-2009 |
20090066281 | METHOD AND APPARATUS FOR ELECTRIC MOTOR TORQUE MONITORING - Methods and apparatus are provided for monitoring an achieved motor torque produced by an electric motor. The method includes determining the achieved motor torque based on a rotor position of the electric motor and a phase current of the electric motor when the motor speed is not greater than a first pre-determined threshold, determining the achieved motor torque based on a loss-compensated power supplied to the electric motor when the motor speed is greater than the first pre-determined threshold, comparing the achieved motor torque with the torque command, and indicating a fault when the achieved motor torque is not within a pre-determined margin of the torque command. | 03-12-2009 |
20090079375 | MOTOR CONTROLLER AND ELECTRIC POWER STEERING APPARATUS - A microcomputer | 03-26-2009 |
20090108786 | Motor protection device and method - A motor protection device includes a detection unit for detecting an operating state of a motor and outputting a detection signal; a reference unit for generating a variable reference signal; a discriminating unit for comparing the detection signal with the variable reference signal to discriminate whether the motor is in an abnormal condition; and a protection unit that receives a result of discrimination from the discriminating unit and limits a driving current for the motor when the motor is in an abnormal condition. The motor protection device is characterized in that the reference unit adjusts the variable reference signal according to a motor rotation detection signal, so that the motor rotation detection signal and the detection signal are used synchronously in discriminating whether the motor is in an abnormal condition, and the motor in an abnormal condition may be doubly protected. | 04-30-2009 |
20090115364 | ELECTRIC MOTOR DRIVING DEVICE, AND AIR CONDITIONER USING THE SAME - Disclosed is a motor-driving device capable of protecting an inverter from breakdown. First current-protecting section retains reference voltage value Vref | 05-07-2009 |
20090115365 | METHOD OF DETERMINING TORQUE LIMIT WITH MOTOR TORQUE AND BATTERY POWER CONSTRAINTS - A method to determine a limit torque associated with an electro-mechanical transmission includes determining electric motor torque constraints and battery power constraints. A limit torque function and a standard form of the limit torque function are determined. The limit torque function and the motor torque constraints and the battery power constraints are transposed to the standard form to determine a limit torque. | 05-07-2009 |
20090121667 | Electronic control system - The invention relates to an electronic control system for controlling a voltage across a load, in particular across a fan motor of a motor vehicle, as a function of a control signal, comprising: a setting transistor, a transistor, which activates the control channel of the setting transistor, as well as two resistors, which form a voltage divider via which the voltage across the load is fed to the emitter of the transistor, wherein the control system is designed, in the absence of the control signal, to block the control channels of all the transistors of the control system for limiting the current through all the resistors of the control system, such that, in the absence of the control signal, the control system has a quiescent current consumption in the off-state current range of the transistors. | 05-14-2009 |
20090140679 | TERTIARY LOCK SYSTEM POWER UNIT - A system for moving an aircraft thrust reverser component includes a power drive unit, a thrust reverser actuator assembly, and a tertiary lock system. The power drive unit is operable to rotate and supply a rotational drive force. The thrust reverser actuator assembly receives the rotational drive force from the power drive unit and moves the thrust reverser component between a stowed position and a deployed position. The tertiary lock system selectively engages and disengages the thrust reverser component and includes a tertiary lock power unit, an electromechanical tertiary lock assembly, and a voltage limiting circuit. The voltage limiting circuit limits the voltage magnitude of a control signal supplied to the tertiary lock assembly to a predetermined value. | 06-04-2009 |
20090160386 | ELECTRIC DRIVE DEVICE CONTROL SYSTEM AND METHOD - An electric drive device control system includes an electric drive device and an electric control unit. The electric control unit stores a control-side correction current for compensating for a current deviation of the electric control unit and a drive-side correction current for compensating for an operation deviation of the electric drive device. The electric control unit updates the drive-side correction current to a new drive-side correction current, which is specific to a new electric drive device, when the electric drive device is replaced with the new electric drive device. The electric control unit also updates the control-side correction current to a new control-side correction current, when the electric control unit is replaced with the new electric control unit. | 06-25-2009 |
20090167227 | Method and control device for monitoring and limiting the torque in a drive train of a road motor vehicle - A method for monitoring and limiting the output or the torque of a drive motor in a drive train of a road motor vehicle, including the steps of: determining a permissible maximum value of the output or the torque as a function of a signal from a driver input sensor; determining an actual value of the output or the torque, and comparing the actual value to the maximum value and triggering a measure that limits the output or the torque as a function of the comparison result. The method is characterized by the repeated formation of a difference from the actual value and the maximum value, formation of a sum of values of a function of the difference, comparison of a value of the sum to a threshold value, and initiation of the measures if the value of the sum is greater than the threshold value. An independent claim is directed to a control device, which is programmed to implement the method. | 07-02-2009 |
20090189559 | ELECTRIC MOTOR PROTECTION SYSTEM - An electric motor protection system for protecting an electric motor of a household appliance includes a temperature sensor for sensing a temperature of the electric motor, a motor speed sensor for sensing a speed of the electric motor, a current sensing circuit for sensing an electric current supplied to the electric motor, a power control device for controlling the electrical power supplied to the electric motor, and a signal processing unit electrically connected to the temperature sensor, the motor speed sensor, the current sensing circuit, and the power control device. The signal processing unit is configured to make calculations and judgments based on the measurements of the temperature sensor, the motor speed sensor and the current sensing circuit, and a plurality of predetermined values, and to control the power control device accordingly so as to protect the motor from overheating, being overloaded, or driven by excessive current. | 07-30-2009 |
20090206784 | Safety Device for Power Window - A safety device for power window, which generates pulses by rotation of a raising/lowering motor for raising or lowering a window glass of a power window for vehicle, and determines occurrence of pinching of a foreign substance from change in pulse width during closing operation of a window, and thus reverses window operation into window opening operation, is obtained, wherein false determination due to variation in voltage of a battery hardly occurs. | 08-20-2009 |
20090218975 | Actuator System - An actuator system, preferably for patient lifters, comprises at least one actuator ( | 09-03-2009 |
20090243527 | INTEGRAL TYPE AIR CONDITIONER - When cooling operation or dehumidifying operation is started, a blower fan for an evaporator and an exhaust fan for a condenser are driven at an initial rotational number. A compressor is driven at a fixed rotational number. Due to load variation, an operating current supplied from a power source is changed. When the operating current exceeds a reference value, the rotational number of the blower fan is gradually reduced. When an endothermic quantity by the evaporator decreases, a temperature of a gas refrigerant flowing through the evaporator is lowered. Since the load applied on the compressor is reduced, the operating current decreases. In this way, when the compressor is loaded, the operating current increased, however, by controlling operation of the fans as described above, it is possible to prevent that the power source is shut off due to overcurrent and operation is stopped. | 10-01-2009 |
20090267556 | FUEL CELL DRIVE SYSTEM - A motor system is configured by: detecting a duration of idle stop by an idle stop end state detection unit | 10-29-2009 |
20090295320 | Method and Apparatus for Variation of a Rated Current - The invention relates to a method for variation of a rated current which is specific of a motor by providing a rated current basic value signal ( | 12-03-2009 |
20100001674 | Method for activating a drive system and drive system - This invention discloses a method for activating a drive system for control surfaces or working systems of an aircraft, wherein the speed of a drive unit of the drive system is regulated, and after a starting operation the maximum driving power available during the further operation for speed regulation of the drive unit is reduced. Likewise, this invention comprises a drive system for control surfaces or working systems of an aircraft, comprising a drive unit with speed regulation and a corresponding control. | 01-07-2010 |
20100019712 | ELECTRIC DRIVER UNIT - An electric driver unit for an electric valve timing adjusting apparatus is disclosed. The electric driver unit includes: a motor for driving the apparatus; a switching part for applying a drive voltage to the motor; a current information output part for providing current information associated with a current flowing in the switching part; a power distribution control part for controlling power distribution to the motor by controlling the switching part; and an oil temperature information output part for providing oil temperature corresponding value, which depends on temperature of oil that surrounds the apparatus. The power distribution control part controls the current based on the current information so that the current stays below a target value. The target value includes a normal value and a large value. The power distribution control part adopts the large value as the target value until the oil temperature corresponding value reaches a predetermined temperature. | 01-28-2010 |
20100039057 | ANTI-PINCH METHOD AND DEVICE FOR CONTROLLING AN OPENABLE AND CLOSABLE BODY - In an anti-pinch method and device for controlling an openable and closable body, a driving circuit operatively drives a motor with a driving current to move the body relative to a frame body between closing and open positions. A current sensor generates a sensing signal corresponding to the driving current. A control unit calculates a difference between magnitude of the driving current and a reference current value upon detecting that the magnitude of the driving current is greater than the reference current value, and outputs an abnormal signal indicative of an object being pinched between the body and the frame body upon detecting that the difference is greater than a predetermined threshold value. The driving circuit is responsive to the abnormal signal from the control unit to perform one of stopping driving of the motor and driving the motor to move the body toward the open position. | 02-18-2010 |
20100045224 | ELECTRIC VEHICLE CONTROL DEVICE - When an electric vehicle outputs a torque instruction, firstly, a request torque is acquired and a judged whether the acquired request torque is positive or negative (S | 02-25-2010 |
20100045225 | Mirror Adjustment Mechanism, Wing Mirror Unit and Method - An electric motor circuit for controlling an electric motor of a mirror adjustment mechanism includes a switch-off circuit that is provided with a current sensor for measuring the electrical supply current and, depending thereon, generating a voltage. In an embodiment, a current branch is configured to be rendered conductive in response to the generated voltage; an electronic switch is configured to interrupt the supply current as a result of the current branch being rendered conductive. The current branch may be configured to form a first branch of a current mirror which is out of balance and is dimensioned such that the first branch does not carry current under normal operating conditions of the motor, and a second branch is conductive. In an embodiment, upon the occurrence of a supply current that is greater than a predetermined critical level, the first branch is also rendered conductive. | 02-25-2010 |
20100052588 | VEHICLE CONTROLLER AND CONTROL METHOD - By the vehicle controller of the present invention, when the economy mode is selected by a driver, boosting by a converter is limited and output torque of a motor is limited. Even in the economy mode, however, if the driver requests large torque, either the limit on boosting or the limit on output torque is cancelled. As a result, a vehicle controller for a vehicle including a battery, a converter boosting/lowering the battery voltage and a motor operating with the power from the converter is provided, by which unnecessary power consumption is reduced and the torque requested by the driver can be generated. | 03-04-2010 |
20100066288 | Over-voltage and under-voltage management for electric drive system - A method of voltage supply management for an electric drive system includes receiving a voltage signal ( | 03-18-2010 |
20100066289 | SYSTEM AND METHOD FOR CONTROLLING AN ELECTRIC MOTOR - A method for controlling an electric motor includes receiving a first control command that is indicative of a desired motor control. A current operating condition for the motor is determined. It is then determined whether the first control command meets at least one predetermined criterion at the current operating condition. A second control command that is different from the first control command is generated when the first control command meets the at least one predetermined criterion. Generating the second control command includes determining a current value of a motor parameter, changing the parameter value, and using the changed parameter value to generate the second control command. The second control command is then used to control the motor. | 03-18-2010 |
20100066290 | VOLTAGE PROTECTING APPARATUS - A voltage protecting apparatus is used for detecting voltage of a motor driver, and adjusting the voltage of the motor driver when at an over-voltage state. The motor driver includes a direct current (DC) power source and a power board. The voltage protecting apparatus includes a switch unit, a voltage transform unit, a controller, a voltage detector, and an over-voltage judger. When the controller outputs a high level signal, the switch unit is turned on, the voltage transform unit transforms the output voltage of the DC power source to a low voltage. The over-voltage judger receives the low voltage and compares the low voltage to a predetermined voltage. When the low voltage is greater than the predetermined voltage, the over-voltage judger outputs a control signal to the controller for signaling the controller to control the power board so as to adjust the voltage of the motor driver. | 03-18-2010 |
20100097024 | DRIVE SYSTEM FOR MULTIPLE MOTORS - A drive system for multiple motors includes a first motor, a second motor, a motor drive power supply for supplying power to the first and second motors, a first motor drive amplifier, a second motor drive amplifier, a first overcurrent detection apparatus, and a second overcurrent detection apparatus. The first overcurrent detection apparatus is connected between the motor drive power supply and the first motor drive amplifier for detecting current through the first motor drive amplifier, and comparing the current value to the first overcurrent benchmark value to output an overcurrent detection signal correspondingly. The second overcurrent detection apparatus is connected between the motor drive power supply and the second motor drive amplifier for detecting current through the second motor drive amplifier, and comparing the current value to the second overcurrent benchmark value to output an overcurrent detection signal correspondingly. | 04-22-2010 |
20100109590 | DRIVING DEVICE AND PROTECTION METHOD THEREOF - A driving device includes a motor, a first rotating portion, a second rotating portion, a piezoelectric assembly, and a controlling unit. The motor includes a rotating shaft. The first rotating portion is fixed to the rotating shaft. The second rotating portion is engaged with the first rotating portion. The piezoelectric assembly is sandwiched between the first rotating portion and the second rotating portion. The controlling unit is electrically connected to the motor and the piezoelectric assembly. The controlling unit is configured for storing a predetermined voltage, and determining whether an electric voltage output by the piezoelectric assembly is greater than or equal to the predetermined voltage and inactivating the motor if the electric voltage output by the piezoelectric assembly is greater than or equal to the predetermined voltage. A protection method for the driving device is also provided. | 05-06-2010 |
20100141194 | Pump Controller System and Method - Embodiments of the invention provide a method of detecting a fault condition in a motor of a pump. The method includes sensing a first current value and a speed of the motor, attempting a recovery operation if the first current value is greater than a current threshold and if the speed of the motor is less than a motor speed low threshold, and sensing a second current value during the recovery operation and shutting down a drive to the motor if the second current value is also greater than the current threshold. The method also includes performing the recovery operation for a time period if the second current value is less than the current threshold and attempting to operate the motor in a normal mode after the time period has elapsed. | 06-10-2010 |
20100244757 | Current Limit Control Method of DC Motor and Related Device and Circuit - A control method of a current limit of a DC motor includes generating a reference voltage according to a preset current limit value of a DC motor; comparing the reference voltage with the voltage drop of a power control switch which drives the DC motor to generate a compare result; and controlling the power delivered to the DC motor according to the compare result in order to limit the current of the DC motor. | 09-30-2010 |
20100283420 | FAN ARRANGEMENT IN WHICH THE CONSUMED ELECTRIC POWER IS INFLUENCED - A fan arrangement ( | 11-11-2010 |
20100320951 | INVERTER DEVICE, ELECTRIC AUTOMOBILE IN WHICH THE INVERTER DEVICE IS MOUNTED, AND HYBRID AUTOMOBILE IN WHICH THE INVERTER DEVICE IS MOUNTED - A torque limit section that applies limit to a torque instruction value of an electric motor such that a switching elements temperature is restricted to no more than an element upper limiting temperature includes a torque restriction section that finds a torque restriction value for restricting the torque of the electric motor in accordance with the said switching elements temperature; a torque restriction mitigation section that finds a torque restriction mitigation value for mitigating the torque limit value in accordance with the integrated value of the deviation of the element upper limiting temperature and the switching elements temperature; a first subtractor that finds a torque restriction value by subtracting the torque restriction mitigation value from the torque limit value; and a second subtractor that finds a limited torque instruction value obtained by subtracting the torque limit value from the torque instruction value and outputs this to the gate generating section. | 12-23-2010 |
20110031920 | CONTROLLER AND METHOD FOR ESTIMATING, MANAGING, AND DIAGNOSING MOTOR PARAMETERS - A motor control system includes a control module, a switching module, and a filtering module. The control module determines output voltages for operating a motor based on a torque demand. The switching module generates switching signals for an inverter that drives the motor. The switching module generates the switching signals based on the output voltages. The switching module generates an out-of-volts (OOV) signal according to a comparison based on the output voltages, a maximum duty cycle, and a voltage of a direct current (DC) bus that provides power to the inverter. The filtering module generates an OOV amount by filtering the OOV signal. The control module selectively limits the torque demand based on the OOV amount. | 02-10-2011 |
20110050141 | ELECTRIC MOTOR STATOR WINDING TEMPERATURE ESTIMATION - A temperature estimation controller and methods are provided for estimating stator winding temperature over a full range of motor operating speeds. In one implementation, the angular velocity of a motor is determined along with a total power loss for each phase of said motor. The total power loss in each phase comprises stator winding power loss and a core power loss. Stator winding temperatures for each phase of motor can then estimated based on the total power loss in that phase, and a combined thermal impedance for that phase. The combined thermal impedance comprises a first thermal impedance between the stator winding and the stator core, and a second thermal impedance between the stator core and the motor coolant. | 03-03-2011 |
20110080128 | FAN SYSTEM CIRCUIT MODULE - A fan system circuit module including a stable voltage input terminal for receiving a stable voltage, an operation unit electrically connected to the stable voltage input terminal and a drive chip. The operation unit includes a first resistor, a second resistor, a first capacitor and a third resistor. After powered on at the stable voltage, the operation unit generates an operation signal for the drive chip to decrease drive current value of the fan. In case that a lock of the fan takes place, the drive chip can effectively decrease the block current. The circuit module has soft-start function and provides block current protection effect so as to avoid malfunctioning of the fan system due to too great start current of the fan and avoid burnout of the fan due to high rise of temperature. | 04-07-2011 |
20110254492 | SYSTEM HAVING A VARIABLE FREQUENCY POWER DISTRIBUTION BUS FOR DRIVING A VARIABLE SPEED MOTOR - A system and method for supplying power to a variable speed motor for rotating a shaft may include generating an A/C output having a variable frequency corresponding to speed of a prime mover, where the speed of the prime mover is equal to or greater than a predetermined speed limit. The A/C output of the prime mover may be distributed to the variable speed motor such that the speed of the variable speed motor is varied relative to the frequency of the A/C output. The variable speed motor may be electrically disconnected from the A/C power when the speed of the prime mover being used to drive the variable speed motor is equal to or within a predetermined range of the predetermined speed limit. An alternate A/C output may be distributed to the variable speed motor after the A/C power is electrically disconnected from the variable speed motor. | 10-20-2011 |
20110260667 | POWER CONTROL ON A MULTI-MOTION ELECTRIC DRIVE SYSTEM - A motor control system for controlling two or more motor groups includes a power converter that receives power from a power source and converts the power to an intermediate power and an intermediate power link coupled to the power converter. The motor control system also includes at least one motor driver coupled to the intermediate power link configured to provide power to one or more motors and a controller coupled to the power converter and the at least one motor driver. The controller is configured to cause the at least one motor driver to limit the amount of power delivered to the one or more motors based on the amount of power that the power converter can produce. | 10-27-2011 |
20120181964 | Method of Controlling a Motor - Embodiments of the invention provide methods of controlling a motor, such as a servo motor. One method can include monitoring a current temperature of the motor and a power stage of the motor substantially continuously and substantially in real-time. This method can include determining optimum settings for a first time interval to remove power and the second time interval to provide power in order to deliver maximum output while remaining below the maximum rated temperature of the motor. One method can include pulsing power to the motor for a second time interval after a first time interval has elapsed and tailoring pulse shapes of the power provided to the motor for the second time interval. One method can include calculating a maximum phase current based on the rotor shaft torque for each real-time speed of the motor that correlates to the maximum allowable current draw from the power supply. | 07-19-2012 |
20120187880 | CONTROL DEVICE FOR AN ELECTRIC MOTOR - A control device for an electric motor of a cooling fan for the radiator of a motor vehicle has a control transistor connected to the motor, and an electronic control unit for controlling the speed of the motor. The control unit controls the transistor in such a manner as to limit the current flowing in the motor to a predetermined value when, by effect of the load conditions of the motor and the voltage applied to the motor, the current in the motor tends to exceed the predetermined value. | 07-26-2012 |
20120194114 | Motor Drive Circuit - A motor drive circuit includes: a drive circuit configured to drive a motor whose coil current decreases with increase in counter electromotive voltage of a motor coil; a detection circuit configured to detect whether or not a current value of the coil current is greater than a predetermined value; a first control circuit configured to control the drive circuit so that the current value of the coil current becomes smaller than or equal to the predetermined value, when it is detected that the current value of the coil current is greater than the predetermined value; and a second control circuit configured to control the first control circuit so that the first control circuit does not control the drive circuit based on a detection result of the detection circuit until a predetermined time has elapsed from a start of supply of the coil current. | 08-02-2012 |
20120206080 | MOTOR DRIVING CONTROL APPARATUS FOR CONTROLLING MOTOR OUTPUT ACCORDING TO POWER CHARACTERISTICS OF AC POWER SUPPLY - A motor driving control apparatus includes a motor driving unit which drives a motor and a driving control unit which supplies to the motor driving unit a command value for the motor driving unit to drive the motor. A power characteristic acquiring unit acquires a power characteristic of an AC power supply that supplies power to the motor. A control parameter determining unit determines based on a voltage characteristic of the AC power supply whether, during driving of the motor, the voltage of the AC power supply drops to a level that adversely affects the driving of the motor, and if positive, the control parameter determining unit sets a control parameter so that the voltage of the AC power supply does not drop below that level and supplies the control parameter to the driving control unit in order for the driving control unit to determine the command value. | 08-16-2012 |
20120242267 | DEVICE FOR CONTROLLING A PLURALITY OF ELECTRICAL CONSUMERS - A device for controlling a plurality of electrical consumers to which a constant control current is applied at control nodes. A transformer unit to which a regulated and/or constant current having a predetermined frequency is applied at the input end comprises at least one first and a second winding at the output end which have a common tap, a first circuit branch forming a first control node for a first electrical consumer is associated with the first winding, and a second circuit branch forming a second control node for a second electrical consumer is associated with the second winding. Furthermore, the first and the second circuit branch each have a magnetically interacting pair of reactors which are wound in opposite directions relative to each other, and a first reactor of said pair is connected to the first control node via rectifying means, while a second reactor of the same pair is connected to the second control node via rectifying means. The reactors that are connected to one of the control nodes are wound in opposite directions. The pairs of reactors are magnetically coupled, in particular having a common reactor core. | 09-27-2012 |
20120274253 | ELECTRIC RATCHET FOR A POWERED SCREWDRIVER - A powered screwdriver system includes an electric ratchet. In accordance with one aspect, the powered screwdriver system includes a driver housing and includes a motor disposed within the housing. A working end provides a rotational output and is mechanically coupled to the rotor. A power source provides power to the motor. A controller receives signals representative of a motor condition and, based on the received signals, controls the motor in a manner providing the electric ratchet. | 11-01-2012 |
20120280643 | METHOD AND DEVICE FOR OPERATING A POWER TOOL - In a method for operating a power tool having an electric motor which is supplied with operating current and operating voltage during the operation, a root-mean-square value of the power output of the electric motor is regulated upon exceeding a predefined limiting value of the electrical power output of the electric motor in such a way that it maximally reaches the limiting value. | 11-08-2012 |
20120299518 | METHOD AND APPARATUS FOR CONTROLLING TORQUE OF AN ELECTRIC MOTOR DRIVEN VEHICLE - Disclosed herein is a technique for controlling the torque of an electric motor driven vehicle. In the technique, the current speed of a drive motor, a speed boundary section, a target torque, a drive torque limit and a generation torque limit are input. The ratio of the current speed in the entire speed boundary section is calculated as a mixture ratio when the current speed is within the speed boundary section. A limit torque is calculated, reflecting the drive torque limit and the generation torque limit in the calculated mixture ratio. Of the limit torque and the target torque, the torque that is smaller in absolute value is determined as the final torque that is required of the drive motor. | 11-29-2012 |
20120299519 | FORCE PROFILING BARRIER OPERATOR SYSTEMS - Disclosed are alternate embodiments of various components of a barrier operator system. and methods of operation, including of the mechanical drive subsystem with segmented and self-locking rail unit, rail mounting supports, belt and chain drive tensioning, and drive assembly carriage and interface; the electronics and software routines for controlled operation of the various barrier operator functions; wall console communications with the barrier operator; encryption and decryption of access codes; establishment and monitoring of travel limits and barrier speed and force profiles; thermal protection of barrier operator drive motors; and establishment and control of communications from the barrier operator to accessories by way of a wireless adapter. | 11-29-2012 |
20120319634 | METHOD AND APPARATUS FOR INITIALIZING AN ELECTRIC POWER CONTROL SCHEME - A method for controlling an electric power flow between a high-voltage battery and an electrically-powered torque machine of a powertrain system includes, upon violating a constraint associated with the electric power flow during operation of the powertrain system, executing a battery power control scheme for controlling the electric power flow including commanding an initial state for a parameter of the electric power flow, the initial state for the parameter of the electric power flow including a maximum estimated state for the parameter of the electric power flow occurring during one of a plurality of selected ones of previous timesteps. | 12-20-2012 |
20130015800 | SYSTEM FOR USE IN CONTROLLING MOTOR TORQUE AND METHOD OF ASSEMBLING SAMEAANM Ramamurthy; Shyam SunderAACI LouisvilleAAST KYAACO USAAGP Ramamurthy; Shyam Sunder Louisville KY USAANM Whalen, JR.; Richard FrancisAACI ProspectAAST KYAACO USAAGP Whalen, JR.; Richard Francis Prospect KY USAANM Thomas; Cecilia MariaAACI ShepherdsvilleAAST KYAACO USAAGP Thomas; Cecilia Maria Shepherdsville KY USAANM Booth; Alistair JosephAACI Fort MillAAST SCAACO USAAGP Booth; Alistair Joseph Fort Mill SC US - A method of assembling an electric drive system includes providing a power conversion assembly and coupling an electric power source and a motor to the power conversion assembly. The method also includes coupling a computing device that includes a processor and a memory device operatively coupled to the processor to the power conversion assembly. The method further includes configuring the computing device to record at least one measurement related to a speed of the motor. The method also includes configuring the computing device to calculate a power output limit of the power conversion assembly and limit the power output of the power conversion assembly by limiting torque induced by the motor as a function of the speed of the motor. | 01-17-2013 |
20130038263 | LIFT APPARATUS AND SYSTEM - A lifting apparatus for a lift system is disclosed. The apparatus includes a) a motor adapted for providing a lifting force, b) at least one connector operatively connected to the motor, the connector adapted for connecting a load-bearing component to the motor, c) an information receiver for receiving a load limit information about the load-bearing component, d) a motor controller electrically coupled to the motor and the information receiver, wherein the motor controller is adapted to limit the lifting force of the motor based on the load limit information received by the information receiver. | 02-14-2013 |
20130057187 | METHOD AND DEVICE FOR DETECTING BLOCKING OR SLUGGISHNESS OF A DC MOTOR - The invention relates to a method for detecting blocking or sluggishness (M | 03-07-2013 |
20130076284 | MOTOR DRIVE DEVICE, AND MOTOR DRIVE METHOD - A motor drive device includes a drive controller for generating drive signal “trq”, a limiter for limiting a value of drive signal “trq” within a range, a limit value generator for generating limit value “lmt”, and a drive output section for generating an energizing signal in response to an output signal from the limiter. The limit value generator generates a comparison signal by adding offset value “ofs” to drive signal “trq” and updates limit value “lmt” based on a size relation between a value (trq+ofs) of the comparison signal and limit value “lmt”. | 03-28-2013 |
20130099709 | Circuit Protection Method and Motor Control Circuit - A circuit protection method for a motor control circuit includes determining whether the motor control circuit complies with an operating condition when the motor control circuit is in a start mode, a lock mode or a restart mode, and modulating a current outputted from the motor control circuit when the motor control circuit complies with the operating condition. | 04-25-2013 |
20130099710 | MOTOR CONTROL METHOD AND MOTOR CONTROL APPARATUS FOR DENTAL HANDPIECE - The present invention relates to a motor control method for a dental handpiece provided with a motor that rotationally drives a cutting tool. The control method includes a step A of limiting the motor current to a first limit current I | 04-25-2013 |
20130106334 | VARIABLE SPEED MOTOR POWER DE-RATING (LIMITING) SYSTEM AND METHOD FOR OPERATING A MOTOR WITH THE SAME | 05-02-2013 |
20130119909 | METHOD OF DETECTING AN OFF-BALANCE CONDITION OF A CLOTHES LOAD IN A WASHING MACHINE - An off-balance detection method comprises a plurality of off-balance detection schemes that utilize wash basket speed to detect an off-balance load condition at speed ranges that span the entire spin cycle and include speeds corresponding to natural frequencies of a mass comprising a wash tub and a wash basket. The schemes can be used alone or in combination with one or more of the other schemes. The off-balance detection method can further comprise a power limiting method to prevent motor overload when an off-balance condition is present. | 05-16-2013 |
20130119910 | ELEVATOR MOTOR POWER SUPPLY CONTROL - An exemplary power supply assembly includes a drive device having a bus capacitor. A switch associated with an input side of the drive device selectively connects the drive device to a power supply. An inductor has an impedance that limits an amount of current supplied to the bus capacitor during an initial charging of the bus capacitor when the switch connects the input side of the drive device to the power supply. A restrictive circuit portion dampens a resonance effect of the inductor. The restrictive circuit portion has a resistance that allows the bus capacitor to charge quickly. The impedance of the inductor has a more significant effect on how quickly the bus capacitor charges than an effect of the resistance. A dampening factor of the restrictive circuit controls a voltage of the bus capacitor during the charging of the bus capacitor. | 05-16-2013 |
20130141028 | MOTOR CONTROLLING APPARATUS - A motor controlling apparatus includes a first target torque value calculator, a frequency detector, a second target torque value calculator, a torque command value calculator, a torque limiter, and a controller. The first target torque value calculator calculates a first target torque value, which is a target value of an output torque of a motor. The frequency detector detects a motor rotational frequency. The second target torque value calculator calculates a second target torque value based on the rotational frequency. The torque command value calculator mathematically combines (e.g., adds) the first and target torque values to calculate a torque command value. The torque limiter sets the signs of the first target torque value and the torque command value to be equal to limit the torque command value according to the first target torque value. The controller controls the motor based on the limited torque command value. | 06-06-2013 |
20130162188 | HANDHELD MACHINE TOOL - A handheld machine tool has a drive motor and a supplementary handle which is mounted on the housing of the handheld machine tool and is assigned a drive-torque limitation device, the drive-torque limitation device limiting the drive torque to a torque level below a maximum torque if the supplementary handle is not mounted on the housing. | 06-27-2013 |
20130162189 | METHOD FOR PERFORMING CLOSED-LOOP AND/OR OPEN-LOOP CONTROL OF A WINDSHIELD WIPER DEVICE, COMPUTER PROGRAM PRODUCT, CONTROL DEVICE AND WINDSHIELD WIPER DEVICE - A method for operating a direct wiper drive having a motor, in particular for a windshield wiper, is described. The method comprises making available a limiting load torque for normal operation, determining at least a first characteristic variable for the plausibility of an exceptional case, determining at least a second characteristic variable for the reliability of an exceptional case, and deactivating the limiting load torque as a function of the first characteristic variable and the second characteristic variable. | 06-27-2013 |
20130181648 | ACTUATOR CONTROL SYSTEM - A system comprising an actuator and a controller configured to drive the actuator with a pulse width modulated (PWM) signal. The controller is configured to limit a duty cycle of the PWM signal in response to a current supplied by the PWM signal. | 07-18-2013 |
20130193891 | PRECISION-FASTENING HANDHELD CORDLESS POWER TOOLS - Cordless power tools include a pistol housing having an upper portion that merges into a downwardly extending handle, a DC motor residing in the upper portion of the housing, the DC motor having a rotor that drives an output shaft; a torque transducer on board the tool in communication with the output shaft; and a dynamic motor control circuit residing in the housing in communication with the motor and torque transducer. The dynamic motor control circuit includes a Kelvin resistor in communication with the motor for measuring motor current and digital hall switches in communication with the motor for measuring motor speed. The motor current can vary by at least 100 A during operation. | 08-01-2013 |
20130214716 | PORTABLE APPLIANCE MOTOR CONTROL WITH SPEED-BASED CURRENT LIMITATION - A method of controlling a portable appliance includes measuring an input current supplied to a motor of the portable appliance and measuring a rotational speed of a shaft of the motor. The method also includes determining a current limit based on the rotational speed of the shaft using a substantially continuous function which relates a domain of rotational speeds to a range of current limits. The method further includes reducing, when the input current exceeds the current limit, the rotational speed of the shaft incrementally along the substantially continuous function until the input current is approximately equal to the current limit. | 08-22-2013 |
20130320900 | SYSTEM AND METHOD FOR TRACTION MOTOR CONTROL - A control method includes monitoring changes in torque produced by a traction motor when an excitation frequency of current supplied to the traction motor changes, determining if the torque produced by the traction motor decreases when the excitation frequency of the current supplied to the traction motor increases, and responsive to the torque produced by the traction motor decreasing when the excitation frequency increases, preventing the excitation frequency of the current supplied to the traction motor from increasing further. | 12-05-2013 |
20130334997 | METHOD AND APPARATUS FOR CONTROLLING A HIGH-VOLTAGE ELECTRICAL SYSTEM FOR A MULTI-MODE TRANSMISSION - A multi-mode transmission for a powertrain system includes a high-voltage electrical system with a high-voltage battery and high-voltage electrical bus coupled to a power inverter electrically coupled to torque machines configured to transform electric power to torque. A method for controlling the multi-mode transmission includes monitoring voltage and current on the high-voltage electrical bus, and estimating electric power limits for the high-voltage electric bus including a constrained battery power command based upon a total motor torque electrical power for the torque machines. Torque commands for the torque machines are constrained in response to the estimated electric power limits for the high-voltage electric bus. Operation of the torque machines of the multi-mode transmission is controlled in response to the torque commands for the torque machines. | 12-19-2013 |
20140021898 | Derating Vehicle Electric Drive Motor and Generator Components - A machine propelled by an electric motor and subject to a deration scheme is described wherein deration is specified by a combination of a temperature signal indicating a degree to which a machine component is overheating. The machine includes an electronic controller that receives a temperature signal indicative of a current temperature status of the electric motor. The electronic controller receives a motor speed signal indicative of a current speed status of the electric motor. The electronic controller calculates, in accordance with a derating scheme, a deration value for the electric motor, the deration value being determined by applying a set of current operating state parameter values to the derating scheme. The set of current operating state parameters include: a motor speed parameter value; and a temperature parameter value. | 01-23-2014 |
20140035504 | Subsea Measurement And Monitoring - A method for monitoring at least one subsea electric machine supplied by a system for electric power transmission. The system has a power supply, a controller and an AC power line connecting the at least one machine with the power supply. The method includes the steps of: receiving at the controller, high speed data from at least one subsea sensor arranged between the subsea side of the AC power line and the at least one subsea electric machine, wherein the high speed data includes measurements of an electrical parameter for the at least one machine; and comparing the one or more measurements to a predetermined value. A system for electric power transmission arranged for operating at least one subsea load or electric machine is also described. | 02-06-2014 |
20140084831 | CONTROL DEVICE AND METHOD FOR CONTROLLING ELECTRIC MOTOR - A control device of an electric motor includes: an operating state setting unit configured to set an operating state; a maximum output acquiring unit configured to acquire maximum output of the electric motor that is preset according to the operating state set; a speed detecting unit configured to detect a speed of the electric motor; a torque limit value calculating unit configured to calculate a torque limit value based on the speed and the maximum output; and a torque limiting unit configured to limit torque of the electric motor by the torque limit value when accelerating the electric motor. | 03-27-2014 |
20140097778 | WIRELESS MOTOR CONTROL SYSTEM - A wireless motor control system includes a connection device and a remote control device. The connection device has a pair of motor connection terminals and a pair of power connection terminals for connecting a motor and an electric power source. The connection device contains a second control circuit board having a processing element, and the processing element has a digital identity for interconnecting the connection device with a control element of the remote control device to form a unique signal transmission channel, and a Zigbee transmission method complied with IEEE 802.15.4 standard forms a group control network. With a relay and a current detector installed in the connection device, the power of the motor is disconnected immediately when there is an over-current. | 04-10-2014 |
20140184121 | MOTOR TORQUE CONTROL APPARATUS AND METHOD - A motor torque control apparatus and method are provided for reducing jolting and noise caused by an acceleration or tip-in operation in an electric or fuel cell vehicle and for improving response to acceleration by the acceleration or tip-in operation. The motor torque control apparatus includes a limiter operative to limit a slew rate of a final torque signal applied to a motor of the vehicle based on a maximum slew rate selected from one of two previously-input slew rate variable maps. Specifically, L-mode and D-mode control units select the slew rate according to slew rate variable maps of an L mode and of D mode, respectively. A switch unit connects one of the L-mode and D-mode control units to the limiter based on a current operation state of the vehicle. The control units select the slew rate based on the torque signal output by the limiter. | 07-03-2014 |
20140203747 | MOTOR CONTROL APPARATUS AND METHOD - A motor control apparatus and method are provided. The motor control apparatus may include a power supply device supplying power to a motor, a power control device selectively blocking current supplied to the motor depending on whether or not the current supplied from the power supply device to the motor is greater than a reference current value, a controller that controls an intensity of the current supplied from the power supply device to the motor, and a load torque detector that detects a load torque generated by the motor as the motor rotates. The controller controls a maximum value of the current to be supplied to the motor so that the maximum value is less than the reference current value when the maximum value of the load torque detected by the load torque detector is greater than a maximum motor output due corresponding to the reference current value. | 07-24-2014 |
20140312821 | INVERTER DEVICE FOR ELECTRIC VEHICLE - An inverter device for an electric vehicle includes an inverter circuit that controls an electric motor connected to a wheel via a connecting member and a control unit that controls torque of the electric motor. The control unit includes a current control unit that executes control so that a q-axis current command for the electric motor matches a current flowing through the electric motor, and a limiter unit that puts limitations so that a magnitude of the q-axis current command does not become equal to or smaller than a preset predetermined value. | 10-23-2014 |
20150028785 | ELECTRIC VEHICLE MOTOR TORQUE SAFETY MONITOR - A safety system for an electric motor controller is provided. The safety system includes a torque safety monitor having a first processor distinct from a second processor of a main motor controller. The first processor is configured to one of decrease or shut down AC (alternating current) power, sent from a DC/AC (direct current to alternating current) inverter to an electric motor, in response to an estimated torque of the electric motor differing from a commanded torque associated with the main motor controller by more than a set amount. | 01-29-2015 |
20150042252 | MOTOR CONTROLLER - The motor controller includes: a current detection section that detects a current between a battery and an inverter circuit generating a voltage applied to a coil of a motor; an overload determination value output section that outputs an overload determination value used to determine whether or not the motor is overloaded; an overload determination section that compares a current value detected by the current detection section against the overload determination value, and that determines the motor to be overloaded in a case in which the current value detected by the current detection section is the overload determination value or greater; and a forced 500 rpm instruction section that controls the motor rotation speed to 500 rpm, this being a specific speed, in a case in which the overload determination section has determined the motor to be overloaded. | 02-12-2015 |
20150084565 | PROTECTIVE MODULE AND METHOD AGAINST TORQUE PEAKS BETWEEN A MOTOR AND AN ELECTRIC MACHINE - A protective method is provided against torque peaks between a motor adapted for setting a shaft of the motor into rotation and an electric source adapted for electrically powering an electric assembly and including a fixed section and a rotating adapted for rotating with the shaft. The method includes a step for controlling the operation of the electric source forcing the rotary movement of the rotating section with the shaft to observe an instruction relating to the torque of the rotating section applied to the shaft of the motor, the instruction being adapted depending on at least one element characterizing a current operating state of the motor. | 03-26-2015 |
20150145456 | CONTROL SYSTEM FOR AN ELECTRIC MOTOR BASED ON A PULSED CONTROL SIGNAL - The present invention concerns a control system for an electric motor, wherein an operating mode with predetermined value assignments is selected for a parameter set for controlling an electric motor and the pulse frequency of a control signal for the electric motor is set in accordance with the selected operating mode in order thereby to signal to the electric motor the selected value assignments for the parameter set. | 05-28-2015 |
20150357962 | GEARED MOTOR UNIT HAVING FUNCTION FOR LIMITING THRUST LOAD - A compact geared motor unit, capable of properly protecting an electric motor without disengaging gears or suspending the unit, even when a thrust force larger than an allowable value is generated. The geared motor unit | 12-10-2015 |
20160020716 | MOTOR CONTROL SYSTEM AND METHOD FOR INPUT CURRENT PROTECTION - A motor control system for adjusting motor speed if a current overload condition occurs. The motor control system may include a motor, a power factor correction (PFC) circuit providing current to the motor, and a signal processor. The PFC circuit may limit current provided to the motor based on an output voltage sensed by the PFC circuit. The signal processor may sense input voltage of the PFC circuit to determine a power limit, then compare sensed or calculated drive power of the motor with the power limit. If the drive power sensed or calculated is greater than the power limit, the signal processor may output a signal for reducing the drive power to the power limit. Limiting the drive power provided to the motor limits or decreases a speed of the motor. | 01-21-2016 |
20160126879 | DUAL POWER MODE DRIVE - A method of controlling a motor drive having a normal mode wherein a DC link voltage is charged using an AC (e.g. mains) power supply and an emergency mode wherein the DC link voltage is charged using a DC supply (e.g. from a battery) is described. In the normal mode of operation, if the DC link voltage falls below a threshold indicative of the AC power supply being lost, the emergency mode is entered, typically following an intervening coast mode (during which the motor is not driven). Similarly, in the emergency mode, if the DC link voltage rises above a threshold indicative of the AC power supply being restored, the normal mode is entered, typically following an intervening coast mode. | 05-05-2016 |
20160142002 | CONTROLLER OF AN ELECTRIC MOTOR - A controller for an electric motor includes a protective circuit for limiting current or for polarity reversal protection, the protective circuit including a field effect transistor having a gate. The protective circuit further includes a control unit for providing a control voltage for the gate, a smoothing capacitor for charge storage being provided at the gate. | 05-19-2016 |
20160181966 | ELECTRIC MOTOR THERMAL PROTECTION USING STATOR CURRENT MEASUREMENTS | 06-23-2016 |
20160190973 | MOTOR DRIVE APPARATUS AND POWER STEERING APPARATUS - A disclosed motor drive apparatus includes a boost converter circuit, a first switch provided between the midpoint of the first upper and lower arms and the power supply, a first connection line connecting the power supply to an output part of the boost converter circuit, motor drive circuits provided for respective phases of a multi-phase motor, a second connection line connecting the output of the boost converter circuit to the respective second upper and lower arms of the motor drive circuits, second switches provided for the respective phases of the multi-phase motor, the second switches each selectively connecting the multi-phase motor to either midpoints of the second upper and lower arms of the corresponding phases or the midpoint of the first upper and lower arms; and a controller controlling the first switch and the second switches. | 06-30-2016 |
20160380574 | CHIP EVACUATION DEVICE DRIVEN BY SYNCHRONOUS MOTOR - In a chip evacuation device that evacuates chips produced in a machine tool to outside of the machine tool, a synchronous motor is used as a power source for the chip evacuation device. A load on the synchronous motor is monitored and a number of rotation or a direction of rotation of the synchronous motor is changed when it is determined that the load exceeds a preset threshold. | 12-29-2016 |