Motor control method, motor control device and computer equipment

Abstract

The present application provides a motor control method, a motor control device, and a computer device. The motor control method includes: obtaining a pulsation signal of the output torque of the motor; extracting the amplitude of the M-order pulsation harmonic in the pulsation signal, M=6n, wherein n is a natural number greater than or equal to 1; according to the amplitude of the M pulsating harmonic, the harmonic current of the M+1 harmonic positively correlated with the amplitude of the M pulsating harmonic is obtained, and the harmonic current of the M-1 order harmonic; the output voltage of the motor is controlled by using the harmonic current as a feedback signal. The motor control method provided in the present application can suppress problems such as speed fluctuation, vibration and noise generated by high-order pulsating harmonics of a permanent magnet synchronous motor.

Description

Technical field [0001] The present application relates to the field of motor control, and more particularly to a motor control method, apparatus and computer equipment. Background technique [0002] PMSM (Permanent Magnet Synchronous Machine, PMSM) as the current electromechanical energy field application of new energy vehicles, new energy power generation, industrial AC servo and power of ships, aircraft and other core power conversion components, with high efficiency, high energy density, wide speed range and simple maintenance. Compared with the conventional electrically excited synchronous motors, permanent magnet synchronous motor canceled brushes, slip rings and other devices, improving reliability, reducing maintenance costs; compared with conventional squirrel-cage induction motor, permanent magnet synchronous motors because No additional current to establish a magnetic field, so the runtime can maintain a high power factor, with high efficiency, energy saving effect is m...

AI Technical Summary

Problems solved by technology

like figure 1 As shown, in the commonly used three-phase permanent magnet motor inverter topology, in order to prevent the short circuit of the DC link caused by the simultaneous conduction of the upper and lower bridge arms, the dead time is generally inserted into the PWM control signal output by the DSP, and the insertion of the dead time And the impact of power device tube voltage drop, so that there are high-order harmonics in the voltage output by the inverter

In the manufacturing process of the motor, due to the limitation of the process, it is difficult to achieve a completely sinusoidal distribution of the spatial magnetic field, resulting in the presence of high-order harmonics in the flux linkage of the permanent magnet when the motor is running.

[0004] The existence of these harmonics leads to the existence of pulsating components in the output torque of the motor. In addition, the existence of cogging torque will also affect the smoothness of the motor output torque

The direct impact of high-order pulsation harmonics is speed pulsation. For high-precision servo systems, the existence of speed pulsation will inevitably reduce the servo performance of the system; high-order pulsation harmonics will also cause vibration of the mechanical system, which will not only damage the bearing , reduce the life of the system, and generate high-frequency auditory noise, which reduces the comfort of the product and limits its application in industries that require high noise levels, such as elevators and household appliances.

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