Motor control device and electric power steering device equipped with same
A control device and motor technology, applied in the field of motor control devices and electric power steering devices, can solve problems such as sound, vibration and torque ripple, current waveform distortion, and deterioration of response performance, and achieve improved noise resistance, easy compensation, and improved Responsive effect
Active Publication Date: 2020-01-03
NSK LTD
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Problems solved by technology
Since this dead time is nonlinear, the current waveform is distorted, the response performance of the control deteriorates, and sound, vibration, and torque ripple occur.
Method used
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[0080] Although the current distortion can be substantially improved by the dead time compensation function and the dq axis decoupling control, it is worrying that the current distortion "caused by the dead time" due to individual differences in ECUs, deterioration over time, etc. change. Also, in the case of only the dq-axis decoupling control, there are cases where "the deviation of the back electromotive force cannot be dealt with due to motor back electromotive force compensation other than the first-order component and individual differences in motors." In addition, in the case of transient steering input, in the case of only dq-axis decoupling control and PI control, there are "due to the delay of the output system and detection system, the delay of the correction function using the motor speed, etc., it cannot follow the "The problem. In order to solve these problems, in order to "improve the current distortion that cannot be compensated by dead time compensation, dq a...
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Provided is a motor control device based on a vector control method, said motor control device improving the strain of a current waveform and enhancing responsiveness to current control by compensating for a dead time of an inverter and estimating a disturbance that cannot be compensated for through the dead time compensation, thus suppressing sound, vibration, and torque ripple of a motor; and anelectric power steering device equipped with the same. The present invention is a motor control device that performs vector control of a three-phase brushless motor on the basis of dq-axis current command values and that performs vector control via an inverter by converting three-phase current detection values of the three-phase brushless motor into dq-axis feedback currents and feeding the dq-axis feedback currents back to the dq-axis current command values, converting deviation voltages of the feedback into two-phase duty command values, and converting the two-phase duty command values intothree phases. The motor control device is provided with: a dq-axis dead time compensation unit that calculates dead time compensation values of the inverter and that performs dead time compensation;and a dq-axis disturbance estimation observer that inputs the dq-axis current command values, a motor revolving speed, the dq-axis feedback currents, and the deviation voltages and that calculates andoutputs dq-axis disturbance compensation values. The motor control device adds the dq-axis disturbance compensation values to the deviation voltages and estimates a disturbance that cannot be compensated for through the dead time compensation.
Description
technical field [0001] The present invention relates to a motor control device and an electric power steering device equipped with the motor control device. The motor control device performs vector control on the driving of a three-phase brushless motor through a dq-axis rotating coordinate system, and performs "inverter dead time compensation". In particular, the present invention relates to a motor control device and an electric power steering device equipped with the motor control device. The motor control device performs dq-axis dead time compensation and estimates the "pass dead time" by the dq-axis external disturbance estimation observer. "External disturbances that cannot be compensated by zone time compensation", and space vector modulation is also performed to further improve the performance of "steering response, abnormal noise of the motor, vibration and torque ripple", and improve responsiveness and noise immunity according to the motor speed. The accuracy of the...
Claims
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IPC IPC(8): H02P21/13B62D5/04B62D6/00H02P27/08B62D101/00B62D113/00B62D119/00H02P21/05
CPCH02P21/13H02P21/05H02P27/08B62D5/04B62D6/00H02P21/22B62D5/0463B62D5/0487H02P27/12
Inventor 高濑博明皆木亮菅原孝义
Owner NSK LTD