Class / Patent application number | Description | Number of patent applications / Date published |
318400050 | With reference signal generation (e.g., from external system, mechanical oscillator, etc.) | 16 |
20080218107 | Motor Drive Unit and Electric Apparatus Having a Motor - A motor drive unit capable of detecting the position of a stationary rotor of any type of sensorless motor, determining a proper startup logic for the rotor, and starting up the motor in a stable condition. To do this, multiple stator coils of the sensorless motor are supplied with rotor-position detecting drive voltages that are adapted to vary the middle point voltage of the multiple stator coils but do not rotate the motor. The middle point voltage of the stator coils is compared with a detection reference voltage. When the result of the comparison matches one of predetermined detection logic patterns, a proper startup logic is generated in accordance with the position of the rotor specified by the matching detection logic pattern to start up the motor. Otherwise, the detection reference voltage is changed in level, and a new rotor-position detecting signal is generated to repeat the procedure for detecting the rotor position. | 09-11-2008 |
20080238349 | METHOD AND CIRCUIT FOR CONTROLLING MOTOR AND BRUSHLESS MOTOR SYSTEM USING THE SAME - A method and a circuit for controlling a motor and a brushless motor using the same are provided. The brushless motor includes three phase coils, wherein the first terminals of all the phase coils are coupled to a common node. The method includes following steps: among the above-mentioned three phase coils, when there is no current flowing through the first phase coil of the above-mentioned three phase coils and a current flows from the second terminal of the second coil to the second terminal of the third phase coil, detecting the voltage at the second terminal of the first phase coil to be a first specific voltage; detecting the voltage drop of a DC sensing resistor to be a second specific voltage; and utilizing the first specific voltage, the second specific voltage and the DC voltage supplied to the motor to estimate zero crossing points for controlling the motor. | 10-02-2008 |
20080252238 | MOTOR DRIVE CIRCUIT - A pulse generation unit generates a PWM signal whose duty ratio changes according to a target torque of a motor. A back electromotive detection circuit compares a back electromotive voltage generated at a coil of the motor with a middle point voltage of the coil, and outputs a back electromotive detection signal that becomes high level at a timing of the zero crossing point. A phase adjustment unit compares phases of the back electromotive detection signal and a reference signal that becomes a predetermined level at a predetermined timing, and adjusts the duty ratio of the PWM signal by feedback so that the phase error becomes a minimum. A frequency adjustment unit adjusts the frequency of the PWM signal such that the frequency of the PWM signal becomes integral multiples of the frequency of the back electromotive detection signal. | 10-16-2008 |
20110062905 | MOTOR CONTROL DEVICE AND ELECTRIC POWER STEERING SYSTEM - A motor control device is configured in such a manner that a current detection circuit and an exciting circuit for a motor resolver share one grounding wire. A microcomputer that serves as a current detector sets a phase of an exciting current in such a manner that values of an excitation noise superimposed on an output voltage of the current detection circuit at respective timings (L | 03-17-2011 |
20120181958 | COMMUTATED ELECTRIC DRIVE AND METHOD FOR CONTROLLING A COMMUTATED ELECTRIC MOTOR - A commutated electric drive has an electric motor having a sensor assembly which has a permanent magnet on a shaft of the electric motor and an analog Hall sensor situated stationary relative to the stator of the electric motor opposite to the permanent magnet. A controller for controlling the windings of the electric motor has a memory for storing a calibration Hall signal of the magnetic field of the permanent magnet, measured using the Hall sensor, over one revolution of the shaft. The controller has a device for comparing the calibration Hall signal with an instantaneous Hall signal of the instantaneous magnetic field of the permanent magnet, measured using the Hall sensor. Temperature effects and aging effects may be recognized and taken into account when determining the rotor position. | 07-19-2012 |
20120249028 | Method and Monitoring Unit for Checking Position Values - A method for checking position values using a monitoring unit to which position values of a position measuring device are supplied at time intervals of a query interval, includes: calculating a movement value from at least two position values and the time interval of their arrival; calculating an expected value for a position value to be checked that follows the at least two position values, by adding the most recent of the at least two position values and a change in position that results from the movement value and the time until the position value to be checked arrives; determining a position expectation interval from the expected value and a maximum position interval; comparing the position value to be checked to the position expectation interval; and outputting a signal that indicates the result of the comparison. | 10-04-2012 |
20130162185 | MOTOR DRIVING SYSTEM AND MOTOR SYSTEM - A motor driving system including command value output means configured to output an analog value according to a rotation speed command; a first power line having first switching means; a drive circuit, to which power is supplied via the first switching means and the first power line, driving a motor supplying rotation based on the analog value; and switching control means configured to make the first switching means nonconductive when the analog value is smaller than a first predetermined value, and independent of the command value output means. | 06-27-2013 |
20130187581 | Method and arrangement for determining the dynamic state of an electric motor - In a method for the determination of a current initial rotational position of a rotor and in an arrangement for carrying out same, an incremental position encoder outputs an output signal. The output signal is produced by superposition of a chronologically random and systematically fluctuating signal interference on a basic signal, and composed of at least two component signals which change periodically in accordance with the rotational position of the rotor and are in a fixed angular relationship to one another. To determine the position, the output signal is used exclusively. The current initial rotational position of the rotor relative to a reference initial rotational position is determined by comparing the time profile of the portion of the systematically fluctuating signal interference of a current measured value sequence of the signal and the measured values of a signal sequence acquired starting from the reference initial rotational position. | 07-25-2013 |
20130271049 | MOTOR CONTROL APPARATUS EQUIPPED WITH DELTA-SIGMA MODULATION AD CONVERTER - A motor control apparatus includes a power conversion unit which supplies drive power to a motor, a current detection unit which detects the value of a current flowing from the power conversion unit to the motor, a delta-sigma modulation AD converter which converts the current value into digital data by using a modulation clock as a system clock, and which starts to count the number of clock pulses of the modulation clock upon reception of a reference signal and, when the number of clock pulses counted reaches a predetermined count value, outputs the digital data obtained during a prescribed time interval which contains the reception time of the reference signal, and a command generating unit which generates, using the digital data supplied from the delta-sigma modulation AD converter, a drive command for commanding the power conversion unit to output commanded drive power. | 10-17-2013 |
20140062357 | MOTOR DRIVING APPARATUS AND OPERATING METHOD THEREOF - There are a motor driving apparatus and an operating method thereof, the motor driving apparatus including: a speed sensor generating a sensor output signal of a motor; a reference signal generating unit generating a reference signal by using the sensor output signal; a pulse counting unit counting the reference signal during a pulse width period of the sensor output signal to provide a count value; and a glitch controlling unit determining whether a glitch is present or not using the count value to remove a glitch when present. | 03-06-2014 |
20140300299 | Method for Controlling an Electronically Commutated Polyphase DC Motor - A method for controlling a brushless DC motor (BLDC motor) having a rotor, a stator and an angle sensor and a logic circuit for generating the phase voltages of the windings depending on the phase angle of the rotor. The logic circuit access a lookup table, in which to implement commutation with block-shaped, trapezoidal, sinusoidal, sinoid-based signal waveforms. The drive values are stored for the electrical phase angle of the rotor for generating phase voltages (V | 10-09-2014 |
20150042250 | MOTOR DRIVING DEVICE - A motor driving device includes a logic unit configured to control an electrical conduction of a motor, a reference clock signal generating unit configured to generate a reference clock signal based on a rotational speed indication signal, a rotational speed signal generating unit configured to generate a rotational speed signal based on a rotational speed of the motor, and a rotational speed feedback control unit configured to receive the reference clock signal and the rotational speed signal and control the logic unit so that the rotational speed of the motor reaches a target value. The rotational speed feedback control unit changes a feedback gain in response to the rotational speed signal. | 02-12-2015 |
20150123579 | METHOD AND APPARATUS FOR CONTROLLING POWER CONVERTER WITH INVERTER OUTPUT FILTER - Power converters and methods are presented for driving an AC load connected through an intervening filter circuit, in which at least one filter current or voltage signal or value is determined according to feedback signals or values representing an output parameter at an AC output of the power converter, and AC electrical output power is generated at the AC output based at least partially on the at least one filter current or voltage signal or value. | 05-07-2015 |
20150381081 | CONTROLLING AN AC MACHINE - A method of controlling an AC machine that includes a stator and a rotor, wherein the method includes, whilst operating the AC machine according to an overmodulation technique: determining a reference speed for controlling the operation of the AC machine; filtering the reference speed such that if the reference speed exceeds a speed limit of the AC machine, the reference speed is reduced towards that speed limit; and controlling the operation of the AC machine based on the filtered reference speed. It has been found that controlling the AC machine in this way helps to inhibit “windup” of a controller used to implement the method, even if the overmodulation technique sets a non-constant maximum voltage. | 12-31-2015 |
20160149526 | MOTOR DRIVE CONTROLLER AND CONTROL METHOD OF MOTOR DRIVE CONTROLLER - A motor drive controller is provided with: a motor drive circuit that drives a motor and having a position detector that detects a position of a rotor of the motor and outputs a position detection signal; a motor control circuit that generates a rotation pulse signal based on the position detection signal output by the motor drive circuit; and a microcomputer that is provided with at least one timer and outputs a conversion signal that is obtained by multiplying the rotation pulse signal by n, where n is a natural number equal to or greater than two. | 05-26-2016 |
20160173014 | METHOD OF DRIVING BRUSHLESS MOTORS, CORRESPONDING DEVICE, MOTOR AND COMPUTER PROGRAM PRODUCT | 06-16-2016 |