Motor control method, motor control device, motor system, and storage medium

Abstract

The present invention provides a motor control method, a motor control device, a motor system and a storage medium. Wherein, the motor control method includes: limiting the command value of the quadrature axis current of the motor according to the difference between the bus voltage and the voltage threshold, and judging the positive and negative of the limit according to the motor speed, and / or calculating the motor according to the difference between the bus voltage and the voltage threshold The compensation angle of the rotor position angle is determined, and the lead or lag relationship of the compensation angle is determined according to the motor speed to compensate the rotor position angle; the operation of the motor is controlled according to the command value of the quadrature axis current and / or the compensated rotor position angle. Through the technical solution of the present invention, in the process of motor deceleration and braking, the quadrature axis current is limited and / or the rotor position angle is compensated, and the compensated rotor position angle is fed back to the next closed-loop operation calculation, so as to realize the whole self-calibration motor. control.

Description

technical field [0001] The present invention relates to the technical field of motors, and in particular, to a motor control method, a motor control device, a motor system, and a computer-readable storage medium. Background technique [0002] In motor control, commonly used methods include V / F (voltage frequency conversion) control, I / F (current frequency conversion) control, vector control, and direct torque control. Among them, V / F control and I / F control are easily affected by load fluctuations, and the harmonics and pulsations of the motor may be relatively large under direct torque control. Vector control can effectively control the motor current, and the steady-state operation and dynamic The responses have certain advantages, but they are more sensitive to input parameters such as motor inductance and rotor angle. [0003] The motor is generally controlled by a frequency converter to rectify the AC power of the grid into DC power, store and transfer capacity through ...

AI Technical Summary

Problems solved by technology

If there is no braking unit or other energy-consuming units on the bus side, or if no control and protection are performed, it will easily cause bus voltage overvoltage and cause failure

[0005] In addition, in vector control, the rotor position information of the motor is particularly critical. Whether using a position sensor or a positionless control algorithm, there may be deviations in the rotor position of the motor

During steady-state operation, the angular deviation of the motor rotor will prevent the AC-D axis current from being distributed according to the command, thus reducing the efficiency of the motor

During deceleration and braking, when the rotor position used for calculation is ahead of the actual rotor position, the direct-axis motor will generate a part of the quadrature-axis current component opposite to the direction of the speed, so that even when the quadrature-axis current is equal to 0, the motor continues to be at Generating operation, the bus voltage continues to rise, causing a fault

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