| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 318400070 | Plural diverse feedback (e.g., torque and speed, load and speed, etc.) | 22 |
| 20080231217 | Brushless Dc Motor Control Method and Brushless Dc Motor Controller - The present invention discloses a control technology for brushless DC motor, in which firstly it is to build or import a motor running parameters' database, then detect the signals always running and the signals closely relevant to the rotor's rotating state such as the voltage and the current, and process these signals and figure out the signals about the rotor's position. Wherein these detected signals should be filtered before being used, and the best filter is the low-pass filter to cut out the high frequency components, and the cut-off frequency of the low-pass filter are determined by the motor running voltage U and PWM signal width when the motor is running at no load, finally determine if the motor is working properly by means of the motor running parameters stored in the database in advance, that is to determine if the detected value is identical with the one predicted from the database. Depending on the results from the detecting and comparison above, the control signal is generated to adjust the motor running state. With the technical method in this invention, the position sensor is not needed. This reduces the motor's external wiring amounts and the wiring complexity. Also the motor's seal is improved. Meanwhile, it is possible to measure the rotor's position accurately in any state according to this invention technology. Thus the motor running state can be controlled properly. | 09-25-2008 |
| 20080315807 | Method for Operating an Electronically Commutated Motor, and Motor for Carrying Out a Method Such as This - An electronically commutated motor (ECM | 12-25-2008 |
| 20090033260 | Method and device for controlling a brushless direct-current motor - Presented in an apparatus for controlling a brushless DC motor with a permanent magnet arranged on a rotor and a stator with windings. The apparatus includes an observer that is adapted to determine an estimated temperature of the permanent magnet as a function of the temperature of the windings, and determine at least one actuating signal for controlling the DC motor as a function of the estimated temperature of the permanent magnet. | 02-05-2009 |
| 20090189555 | Electric motor control device and drive unit - An electric motor control device includes a power supply unit that supplies power to a three-phase electric motor; a three-phase current sensor that individually detects three respective phase currents of the three-phase electric motor; a summing unit that calculates a three-phase sum by adding the three phase currents detected by the three-phase current sensor; a detected current correction unit that calculates correction amounts for at least two of the three phase currents based on a phase and an amplitude of the three-phase sum and then corrects phase current detection values by the calculated correction amounts; and a motor control unit that controls a power supply by the power supply unit to the three-phase electric motor by feedback control based on the three phase currents after correction by the detected current correction unit and on target currents. | 07-30-2009 |
| 20090243524 | Power Inverter - A power inverter comprises a power module connected at least to a rotating electric machine, a gate drive circuit board which supplies switching power to the power module, and a rotating electric machine control circuit board which supplies a signal for controlling the waveform of the switching power to the gate drive circuit board. A noise reduction board is formed on a board different from the rotating electric machine control circuit board. The configuration of the noise reduction board is such that various signals for forming a signal for controlling the waveform of the switching power by means of the rotating electric machine control circuit board are inputted through the noise reduction board to the rotating electric machine control circuit board. | 10-01-2009 |
| 20090256505 | SYNCHRONOUS MOTOR AND CONTROL METHOD OF SYNCHRONOUS MOTOR - A synchronous motor including therein a three-phase inverter and position sensors, having a unit for calculating a digital input current value from the analog output of an input current detection circuit that detects the input current flowing into the DC input terminal of the three-phase inverter, and a digital feedback speed control unit for adjusting the amplitudes and frequency of the AC voltages outputted from the three-phase inverter in such a manner that the motor speed calculated by a motor speed calculation unit | 10-15-2009 |
| 20090309526 | CONTROL CIRCUIT WITH DUAL PROGRAMMABLE FEEDBACK LOOPS FOR BLDC MOTORS - A BLDC (brushless direct current) motor system of the present invention includes a control circuit, a sequencer, a driving circuit, and a BLDC motor. The control circuit comprises a speed-feedback loop and a torque-feedback loop to control the maximum speed and the maximum torque of the BLDC motor in parallel configuration. The speed-feedback loop generates a speed-control signal. The torque-feedback loop generates a torque-control signal. A PWM circuit receives the speed-control signal and the torque-control signal to generate a PWM signal. A pulse width of the PWM signal is correlated to the level of the speed-control signal and/or the level of the torque-control signal. | 12-17-2009 |
| 20100052582 | METHOD AND ARRANGEMENT FOR DETERMINING ROTATION SPEED OF A MOTOR - A method and an arrangement for determining the rotation speed of a motor fed by an inverter, the arrangement comprising means for determining the rotation speed of the motor in at least two alternative manners, whereby the means for determining the rotation speed of the motor comprise one of the at least two alternative manners of performance: means for measuring the frequency of the voltage fed to the motor by the inverter; and means for estimating the rotation speed of the motor on the basis of the measured frequency. | 03-04-2010 |
| 20100097019 | System and Method for Providing Cooling Fan Characteristic Feedback - A device comprising a fan controller, an encoder, a driver, a resistor/capacitor filter, and a baseboard management controller. The fan controller is configured to output a cooling fan status signal, and to output a cooling fan information data signal. The encoder is configured to encode the cooling fan status signal and the cooling fan information data signal together into a combined signal. The driver is configured to invert the combined signal and to output an inverted signal. The resistor/capacitor filter is configured to filter out the cooling fan information data signal from the inverted signal, and to output a filtered signal. The baseboard management controller is configured to determine a status of a cooling fan in response to the filtered signal, and to output a control signal to the fan controller module for the cooling fan based on the cooling fan information data signal within the inverted signal. | 04-22-2010 |
| 20110006711 | APPARATUS FOR CARRYING OUT IMPROVED CONTROL OF ROTARY MACHINE - In an apparatus, a predicting unit uses, as an initial value of a controlled variable, at least one of a first measured value of the controlled variable and a second measured value of a physical variable expressed as a function of the controlled variable. The predicting unit predicts, based on the initial value of the controlled variable, a value of the controlled variable when a driving mode of a switching element of a power converter is set. A driving unit has an integral element and determines, based on an output of the integral element to which a deviation between the predicted value of the controlled variable and a command value of the controlled variable is inputted, an actual driving mode of the switching element to thereby drive the switching element in the determined driving mode. | 01-13-2011 |
| 20110062907 | APPARATUS AND METHOD FOR DRIVING SENSORLESS MOTOR - An apparatus and a method for driving a sensorless motor are described and shown in the specification and drawings, where the method includes steps as follows. First, a control signal is acquired, where the control signal has information of a predetermined rotational speed. Next, energy is supplied and progressively increased to the sensorless motor, so as to rotate a rotor of the sensorless motor. Then, a position of the rotor is detected. Finally, the energy is gradually regulated so that the sensorless motor is maintained at the predetermined rotational speed. | 03-17-2011 |
| 20110215744 | METHOD FOR DETECTING THE ROTOR POSITION OF AN ELECTRIC MACHINE, AND DEVICE FOR THE SAME - The invention relates to a method for providing information on a rotor position of a rotor of an electric machine ( | 09-08-2011 |
| 20110234130 | MOTOR CONTROL DEVICE - A motor control device for controlling a three-phase brushless motor that has a rotor and field coils includes: a load range determining unit that determines a rotor rotation angle range, in which the three-phase brushless motor becomes a load, as a load range when a short-circuit fault occurs in one of a plurality of switching elements. The load range determining unit determines a rotor rotation angle range, in which load current is presumed to flow through a closed circuit formed of the short-circuit switching element and any one of regenerative diodes connected in parallel with the respective normal switching elements when the rotor is rotated in a state where all the switching elements other than the short-circuit switching element are turned off, as the load range. | 09-29-2011 |
| 20120206073 | Method and System for Measuring a Characteristic of an Electric Motor - A control system for an electric motor having a first control device arranged to control current in a first coil set for generating a first torque on a rotor and a second control device arranged to control current in a second coil set for generating a second torque on the rotor, the system comprising a controller arranged to instruct the first control device to control current in the first coil set to generate a torque on the rotor to allow rotation of the rotor; and means for measuring a characteristic associated with the second coil set resulting from the rotation of the rotor from the torque generated by the first coil set while substantially no current is flowing in the coils of the second coil set. | 08-16-2012 |
| 20120217915 | System for Calibrating an Electrical Control System - A method calibrates a current sensing instant to latch a current value from a set of current signals. A current command including a magnitude at a Gamma angle is provided to control a motor when the motor is operating in a motoring mode at a shaft speed. A matching current command including a same magnitude at a same Gamma angle is provided to control the motor when the motor is operating in a braking mode at a same shaft speed. A first actual averaging rms current magnitude of three phase currents of the motor is monitored when the motor is controlled by the current command and operating in the motoring mode. A second actual averaging rms current magnitude of the three phase currents of the motor is monitored when the motor is controlled by the matching current command and operating in the braking mode. A current sensing instant is adjusted until an observed first actual averaging rms current magnitude in the motoring mode equals an observed second actual averaging rms current magnitude in the braking mode. | 08-30-2012 |
| 20120229063 | INVERTER POWER GENERATOR - An inverter power generator includes a current controller | 09-13-2012 |
| 20130154528 | SYSTEMS AND METHOD FOR CONTROLLING ELECTRIC MOTORS - A method for controlling a permanent magnet synchronous motor is disclosed. The method comprises receiving a feedback current from a motor; generating a digital current signal based on the feedback current, the digital current signal indicative of a value of the feedback current; generating a power signal and a first imaginary power signal based on the digital current signal and a three-phase voltage signal; receiving a speed signal indicative of an expected speed of the motor; generating a phase signal based on the speed signal and the power signal; generating a voltage signal based on the speed signal, the power signal, and the first imaginary power signal; and adjusting the three-phase voltage signal for driving the motor based on the voltage signal and the phase signal. | 06-20-2013 |
| 20130264978 | MOTOR POSITION AND VELOCITY DETECTING SYSTEM - Disclosed herein is a motor position and velocity detecting system capable of accurately detecting a position and a velocity of a motor without adding a hall sensor or the number of poles of the motor. The motor position and velocity detecting system includes: a hall sensor outputting hall signals from rotation of a motor; an edge detector detecting edge signals for the hall signals to output edge pulse signals; a peak detector detecting peak signals for the hall signals to output peak pulse signals; a position outputter connected to the edge detector and the peak detector and outputting a position of the motor; and a velocity outputter connected to the edge detector and the peak detector and outputting a velocity of the motor. | 10-10-2013 |
| 20140097775 | VARIABLE SPEED FAN MOTOR - A variable speed fan motor, including: a variable speed motor and a motor controller. The motor controller includes a microprocessor, an inverter circuit, a gear detection circuit, and a power supply unit. The gear detection circuit includes a plurality of Hall current sensing units. Each second power input line is connected with a first input end of each of the Hall current sensing units. Second input ends of the Hall current sensing units are connected in parallel, and are connected with a second AC input end of the power supply unit. An output end of the Hall current sensing unit is connected with an input end of the microprocessor. The microprocessor selects operating parameters according to an energized signal of the second power input lines and controls the variable speed motor to operate in accordance with the selected operating parameters. | 04-10-2014 |
| 20140232310 | SYSTEM AND METHOD FOR CONTROLLING A SINUSOIDAL-DRIVE BRUSHLESS DC ELECTRIC MOTOR FOR AN AUTOMOTIVE POWER ACTUATOR - A control system ( | 08-21-2014 |
| 20150015170 | Method and Apparatus for Determining Position for a Permanent Magnet Elevator Motor - A system for determining the angular position of a synchronous motor includes an encoder with a friction wheel engaging a rotating surface of the motor. The friction wheel is spun by the rotation of the motor, and the encoder generates a signal corresponding to the angular position of the friction wheel. An independent, sensor is provided to generate a pulse once per revolution of the motor. The independent sensor detects the presence of a target on the rotating surface of the motor and generates the pulse when the target is proximate to the sensor. A controller receives the signal corresponding to the angular position of the friction wheel as well as the pulse generated by the independent sensor to determine the angular position of the motor. The controller compensates the angular position of the motor each time the pulse is generated, correcting accumulated position error. | 01-15-2015 |
| 20150048768 | METHOD AND DEVICE FOR DETERMINING THE ROTOR POSITION AND SPEED OF A ROTATING FIELD MACHINE - A method for determining the rotor position and the rotational speed of a rotating field machine, including, based on Hall sensor signals, a step of determination of a sector in which a rotor of the rotating field machine is situated and a step of determination of a preliminary rotational speed of the rotating field machine. In a step of determination, the rotor position and the rotational speed are determined based on the sector and on the preliminary rotational speed, an observer of the rotating field machine being used at least for the determination of the rotational speed. | 02-19-2015 |
