| Entries |
| Document | Title | Date |
|---|
| 20080239594 | Motor Lock Detection Circuit - A motor lock detection circuit for detecting lock of a motor, comprising: a binarizing circuit to binarize a signal, obtained from the motor, having a frequency corresponding to rotation speed of the motor, to generate a binary signal; an edge detecting circuit to generate an edge detection signal when detecting an edge of the binary signal; a first counter to count based on a first counter clock, be reset according to the edge detection signal generated by the edge detecting circuit, and generate a count signal when counting for a first count period longer than an interval between edges of the binary signal; and a second counter to count based on a second counter clock, be reset according to the count signal, and generate a motor lock detection signal indicative of detection of lock of the motor when counting for a second count period longer than the first count period. | 10-02-2008 |
| 20080259510 | Control Apparatus for an Actuating Device in a Motor Vehicle - Control apparatus for an actuating device in a motor vehicle, in particular a motor vehicle seat actuating device, having a sensor for determination of an actual speed of a drive movement of a drive for the actuating device, having a computation unit which is connected to the sensor, and having a power driver for passing current through the drive as a function of the control signal, with the computation unit being designed and configured to regulate the actuating speed of the drive movement as a function of the actual speed and of a predeterminable set speed by means of a control signal, and to stop or to reverse the drive movement as a function of an evaluation, associated with trapping, of the control signal. | 10-23-2008 |
| 20080278869 | Electric Machine Control System - A drive system for an electrical machine is provided. The system includes a control unit and a monitoring unit, which is independent of the control unit. The control unit includes a device that converts one or more incoming operating parameters of the electrical machine to an output value. The monitoring unit includes a device that converts the operating parameters to a comparison value, with the conversion being carried out more quickly in the control unit than in the monitoring unit. A comparator compares the output value or an intermediate value of the output value with the comparison value of the output value or of the intermediate value. | 11-13-2008 |
| 20080291588 | Motor control microcomputer and control method for the same - An object of the present invention is to improve safety of a motor by instantaneously detecting the abnormality of a PWM signal. To achieve the object, provided is a motor control microcomputer for outputting PWM signals to a motor drive circuit driving a motor, which includes an abnormal signal detection circuit and a PWM signal stop circuit. The abnormal signal detection circuit receives inputs of positive-phase and negative-phase signals of the PWM signals, detects that both of the positive-phase and negative-phase signals are at the H level, and then outputs detection signals. The PWM signal stop circuit receives the detection signals from the abnormal signal detection circuit, and stops the outputs of the PWM signals. | 11-27-2008 |
| 20090073617 | MULTI-PHASE AC MOTOR DRIVING DEVICE - A multi-phase AC motor driving device in which occurrence of failure is not erroneously determined is provided. In a multi-phase AC motor driving device including an inverter circuit; current detecting resistances Ru, Rv, and Rw, respectively arranged on lower arm of the respective phase of the inverter circuit, for detecting phase current of the motor; and a control portion and a PWM circuit for controlling ON/OFF operation of switching devices of the inverter circuit, the determination on the occurrence of failure based on the current values detected by the current detecting resistances is not made if the ON-duty ratios of the switching devices on the upper arms of the inverter circuit are not smaller than a predetermined value. | 03-19-2009 |
| 20090091866 | SHIFT SWITCHING DEVICE AND SHIFT SWITCHING METHOD - A shift-by-wire shift switching device and shift switching method that switch a shift range of an automatic transmission using an electric motor. The shift switching device includes a controller that determines whether a fault has occurred in a current supply line of each phase of the electric motor on a phase-by-phase basis, executes an open-loop control of the electric motor using only the phases in which it has been determined that a fault has not occurred, and determines whether a fault has occurred in the current supply line by detecting an activation state of the electric motor when the open-loop control of the electric motor is executed. Therefore, it is possible to determine whether a fault in the motor is a short-circuit fault or a break fault, without addition of a part such as a short-circuit detection sensor. | 04-09-2009 |
| 20090310264 | MOTORISED BARRIER ROLLER - A fire or smoke barrier | 12-17-2009 |
| 20090323232 | ELECTRIC POWER CONVERSION DEVICE, COMPRESSOR MOTOR WITH THE DEVICE, AND AIR CONDITIONER WITH THE MOTOR - The device is provided with an electric power conversion circuit including switching elements for converting a DC electric power to an AC electric power, a load connected to an output side of the electric power conversion circuit, means for detecting a current flowing through a DC side in the electric power conversion circuit, a voltage command value preparing means for controlling the operation of the switching elements in the electric power conversion circuit and a wire breaking detecting means. The wire breaking detection means judges a wire breaking in the load or an abnormality of any of the switching elements in the electric power conversion circuit by making use of a DC current detection value in a period when a current of maximum voltage phase or of voltage minimum phase of the electric power conversion circuit is flowing in a DC current. | 12-31-2009 |
| 20100123980 | Electrical power diagnostic system - An electrical power diagnostic system includes a system housing, a power saw management system, and a user interface. The system housing is electrically connected with the power unit of the power saw, wherein the system housing includes a control panel provided thereon for allowing a user to adjust an operational parameter through the control panel. The power saw management system includes a control processor mounted within the system housing to electrically communicate with the power saw, wherein the control processor is pre-programmed to manage operational parameters of the power saw and supervise actual operation of the power saw machine and the saw blade in such a manner that when abnormal operating condition of the power saw machine is detected, the control processor is adapted to selectively adjust the operational parameters of the power saw machine for stopping the abnormal operating condition from continuously happening. | 05-20-2010 |
| 20100226052 | DRIVING DEVICE AND PROTECTION METHOD THEREOF - A driving device includes a motor, a clutch gear, a first rotating portion, a second rotating portion, a piezoelectric assembly, and a controlling unit. The motor includes a rotating shaft. The clutch gear is fixed to the rotating shaft. The first rotating portion sleeved on the rotating shaft includes a first end meshing with the clutch gear and a second end opposite to the first end. The second rotating portion is engaged with the second end. The piezoelectric assembly is sandwiched between the second end 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 a voltage output by the piezoelectric assembly equals to or exceeds the predetermined voltage. A protection method for the driving device is also provided. | 09-09-2010 |
| 20100232076 | METHOD FOR MITIGATING NEGATIVE SEQUENCE EFFECT RESULTING FROM NON-SYMMETRICAL SHORT CIRCUIT FAILURE OF SYNCHRONOUS ELECTRIC MACHINE BASED SYSTEMS - A drive system for a multi-phase electric machine with a permanent magnet rotor, the drive system may comprise conduction paths for each phase. Detectors on each of the conduction paths may determine electrical condition of the conduction path. At least one selectable interconnection path may be present between all of the conduction paths. The at least one selectable interconnection path may be operable to connect all of the conduction paths together responsively to one or more of the detectors determining that the electrical condition of its respective electrical path is representative of a predetermined electrical fault condition so that heating of the rotor during continued rotation of the rotor is prevented. | 09-16-2010 |
| 20110007436 | DEVICE AND METHOD FOR TAKING A SAFETY PRECAUTION AN IN ELECTRICAL TOOL - The invention relates to a device ( | 01-13-2011 |
| 20110051297 | Device, Computer Program Product and Computer-Implemented Method for Backspin Detection in an Electrical Submersible Pump Assembly - A system for determining whether a motor in an electrical submersible pump is backspinning is described herein. The system comprises a sensor mounted in a well bore proximate to a ground surface, the sensor outputting a backspin signal; a communication link connected to the sensor, the communications link communicating the backspin signal; and a controller receiving the backspin signal from the communications link and processing the backspin signal to determine whether the motor is backspinning. Computer readable instructions associated with the system perform the steps of: monitoring the signal to determine whether the signal is above a threshold, the threshold for determining whether the signal is a noise signal or a backspin signal, and outputting the backspin signal; impeding operable AC power to the motor, responsive to the backspin signal; monitoring the backspin signal to determine whether the backspin signal is below the threshold; and returning AC power to the motor responsive to the determination that the backspin signal is below the threshold. | 03-03-2011 |
| 20110149445 | Fault Clearing for Permanent Magnet Machines - A permanent magnet machine (PMM) has a kinetic portion electrically coupled to a power conversion portion. Motive power is provided to the kinetic portion by a torque applied to a motive shaft coupled to a prime mover, such as an aircraft engine or an automobile engine. A sensor is effective to detect a fault condition in the kinetic portion. When a fault is detected, the sensor applies a voltage to a winding within the kinetic portion generating an opposing directional counter torque to the motive shaft. A combination of the torque and counter torque exceeds a fracture yield strength of the motive shaft. The fault condition is then rendered safe while the prime mover may continue normal operation. | 06-23-2011 |
| 20110249368 | METHOD FOR DETECTING EARTH-FAULT CONDITIONS IN A MOTOR CONTROLLER - The present invention relates to a method for determining the existence of an earth-fault on-the-fly and thereby protecting a motor controller having a high- and a low-side DC-link, and having high- and low-side switching elements, the high- and low-side switching elements being operatively connected to the high- and low-side DC-link buses, respectively, the method comprising the steps of generating a fault signal, generating at least one test vector in response to the fault signal by switching at least one of the switching elements on, and measuring, while the at least one switching element is on, the magnitude of a current flowing in that DC-link operatively connected to the conducting switching element in order to detect an earth-fault. The present invention further relates to additional methods for on-the-fly determination of earth-faults. | 10-13-2011 |
| 20120081818 | System and Method for Fast Discharge of a Ring Motor Field - High-power synchronous motors are commonly used in mining operations, for example, in gearless draglines, gearless conveyor drives, and gearless mill drives. Substantial electromagnetic energy is stored in the inductive field windings. In the event of a system fault, such as a short in the direct current power source exciting the field windings, the electromagnetic energy needs to be discharged from the field windings. This electromagnetic energy is typically dissipated as waste heat through a resistor. Disclosed is a field discharge system in which the electromagnetic energy is captured and stored as electrical energy in a capacitor. If an ultracapacitor bank is used for storage, the charged ultracapacitor bank can be used as a backup or auxiliary power source for mining operations. The discharge time is sufficiently small that high speed circuit breakers are not needed to disconnect stator windings from the alternating current power source when a fault occurs. | 04-05-2012 |
| 20120140364 | DRIVE FORCE DISTRIBUTION CONTROL APPARATUS - A drive force distribution control apparatus in which if a relay output voltage (Vah) detected by relay-output-voltage detecting means ( | 06-07-2012 |
| 20120182649 | Motor Drive Circuit - A motor drive circuit comprising: a drive circuit configured to supply a drive current to a drive coil of a motor; a control circuit configured to control an operation of the drive circuit; a locking protection circuit configured to control an operation of the control circuit so that the drive circuit stops supplying the drive current to the drive coil, if a rotation signal, indicating rotation of the motor, is not generated during a predetermined time period although the drive circuit is supplying the drive current to the drive coil; and a prohibition circuit configured to prohibit the locking protection circuit from controlling the control circuit. | 07-19-2012 |
| 20120275068 | FAULT TOLERANT ELECTRICAL MACHINE - A fault tolerant electrical machine including: a plurality of phases; a detector arranged to detect a fault in at least one of the phases; and a controller arranged to intentionally cause a fault in at least one other of the phases such that the vector sum of the second harmonic power vectors of the remaining phases is zero. | 11-01-2012 |
| 20130155552 | MOTOR DRIVE DEVICE - A motor drive device according to the present invention includes a motor having a rotor and a drive coil, a rotor position detector, a speed detector that converts position information into speed information, a direction detector that converts the position information into rotating direction information, and a drive unit that drives the motor. When any one of a case where a pulse of a rotor position detector signal is not inputted to the speed detector and another case where a change of rotating direction of the motor is detected by the direction detector in a state in which the rotor repeats a forward rotation and a backward rotation in a condition of the rotor is locked. | 06-20-2013 |
| 20130176648 | POLE-SLIP PROTECTION SYSTEM AND METHOD FOR SYNCHRONOUS MACHINES - A method of protecting a synchronous machine ( | 07-11-2013 |
| 20140055890 | CIRCUIT ASSEMBLY FOR AN ALTERNATING CURRENT CONTACTOR, MOTOR PROTECTION RELAY AND METHOD FOR PRODUCING A POWER SUPPLY UNIT - A circuit assembly for an alternating current contactor has an excitation coil, wherein the excitation coil has at least one first winding for generating a pick-up and/or release current. A method for producing a power supply unit of an electric load includes using an excitation coil of an alternating current contactor having at least one first winding for generating a pick-up and/or release current. | 02-27-2014 |
| 20140063661 | MOTOR RELAY WITH INTEGRATED ARC-FLASH DETECTION - Disclosed herein are various embodiments of devices and related methods for detecting an electrical arc event using a motor management relay and for suppressing the electrical arc event. The motor management relay may incorporate an optical arc-flash sensor configured to detect an optical event. Control logic may analyze the optical event and determine whether the optical event corresponds to an electrical arc event. When an electrical arc event is detected an instruction may be issued via a control port in communication with the control logic to implement a protective action. According to various embodiments, a plurality of sensors for monitoring electrical characteristics of a motor may also be in communication with the control logic. Input from the sensors may be analyzed in order to determine whether the optical event corresponds to an electrical arc event. | 03-06-2014 |
| 20140111888 | FAULT DETECTION SYSTEM AND METHOD FOR OVERSPEED PROTECTION SPEED SENSORS - A fault detection system for an over-speed protection system of a rotating machine includes a first speed sensor, second speed sensor, and third speed sensor sensing a speed of a shaft of the rotating machine. The system includes a first input configured to receive a first pulse train from the first speed sensor, a second input configured to receive a second pulse train from the second speed sensor, a third input configured to receive a third pulse train from the third speed sensor, and a processor configured to generate a shutdown signal for the rotating machine based on the first pulse train, the second pulse train, and the third pulse train. | 04-24-2014 |
| 20140118865 | DISCONNECTION DETECTING DEVICE FOR ROTATING ELECTRICAL MACHINE, METHOD FOR DETECTING DISCONNECTION OF ROTATING ELECTRICAL MACHINE - A disconnection detecting device that can be applied to a control system of a motor-generator is provided. A disconnection detecting section judges whether logical conjunction (i.e. AND operation) of a condition that both current sensors are operating normally and a condition that the designated torque is equal to or more than a specified torque is true or not. In the event that the disconnection detecting section has determined YES, the disconnection detecting section judges whether the logical conjunction of a condition that the absolute value of the phase current is equal to or less than a specified current (>0) and a condition that the absolute value of the current change rate is equal to or less than a specified value (>0) is true or not. In the event that the disconnection detecting section has determined YES, the disconnection detecting section has determines that the disconnection has occurred. | 05-01-2014 |
| 20140240874 | TRACTION MOTOR DRIVE SYSTEM FOR A LOCOMOTIVE - A traction motor drive system may include a plurality of armatures arranged in parallel with each other. The traction motor drive system may also include a plurality of field circuits arranged in series with one another, where each field circuit is associated with a respective one of the armatures. The plurality of field circuits may be arranged in parallel with the plurality of armatures. The traction motor drive system may also include a field isolation system. The field isolation system may include a shunt circuit associated with at least one of the field circuits. The shunt circuit may have a first and second shunt terminal. The field isolation system may also include a first field switch arranged in series with the plurality of field circuits. The first field switch may be configured to switch between the first shunt terminal of the shunt circuit and a first field terminal of at least one of the field circuits. The field system may also include a second field switch, arranged in series with the plurality of field circuits. The second field switch may be configured to switch between the second shunt terminal of the shunt circuit and a second field terminal of at least one of the field circuits. | 08-28-2014 |
| 20140340795 | PROTECTION CIRCUIT - A protection circuit includes a protection module and a fan electrically connected to the protection module. The protection module includes a control chip, an inverter, and an electronic switch. An input terminal of the inverter is electrically connected to a voltage output terminal and the fan, and further electrically connected to a clear pin of the control chip. An output terminal of the inverter is electrically connected to a preparation pin of the control chip. A first terminal of the electronic switch is electrically connected to an output pin of the control chip. The first and second terminals of the electronic switch are electrically connected to a power source terminal A third terminal of the electronic switch is electrically connected to the voltage output terminal When the fan short-circuits, the power source terminal stops supplying power to the fan through the voltage output terminal | 11-20-2014 |
| 20140340796 | System and method of automatic detection and prevention of motor runaway - A robotic catheter control system includes a plurality of electric motors. Diagnostic logic automatically detects motor runaway fault conditions based on the current motor position, the target motor position and a predetermined tolerance parameter. Fault conditions include overshoot, movement in the a non-prescribed direction, exceeding a prescribed maximum motor speed and exceeding a prescribed maximum motor acceleration. The diagnostic logic terminates operating power to the electric motor when a fault condition is detected for any one of the motor. An error message is generated to notify the operator of the fault. | 11-20-2014 |
| 20150103449 | MOTOR PROTECTION DEVICE, MOTOR PROTECTION METHOD, AND MOTOR CONTROL SYSTEM USING THE SAME - Disclosed herein are a motor protection device, a motor protection method, and a motor control system using the same. According to the present invention, the motor protection device including: a rotation speed change sensing unit that senses and outputs pulse widths of a pulse signal outputted from a rotation sensor installed in a motor; an abnormality determining unit that outputs abnormality-occurrence signal if the pulse widths of the pulse signal outputted from the rotation speed change sensing unit increase beyond a predetermined value; and a stopping unit that stops operation of a motor control system if the abnormality-occurrence signal is outputted from the abnormality determining unit, the motor protection method, and the motor control system using the same are provided. | 04-16-2015 |
| 20150349518 | SWITCHING DEVICE FOR CONTROLLING ENERGY SUPPLY OF A DOWNSTREAM ELECTRIC MOTOR - A switching device includes an energy store and a measuring device connected to a control apparatus. The energy store is connected in series between the supply connection and the power supply. The control apparatus can monitor the energy supply of the switching device in the area between the supply connection and the power supply taking place via the supply connection via the measuring device. If the energy supply monitored by the measuring device falls into a critical range, and using the energy from the energy store: the control apparatus connects the semiconductor switch in an electrically conductive manner and then opens the second switch; and subsequently switches the semiconductor switch to an electrically non-conductive state and then opens the first switch. | 12-03-2015 |
