Motor maximum torque current ratio control method and device, and computer readable medium

Abstract

The invention provides a motor maximum torque-current ratio control method and device, and a computer readable medium. The method comprises the steps: obtaining a first electromagnetic torque used forrepresenting an electromagnetic torque needed to be generated by a permanent magnet synchronous motor; determining a target quadrature-axis current and a target direct-axis current according to the first electromagnetic torque and a preset first mapping relationship, wherein the first mapping relationship is used for representing a geometrical relationship between the quadrature-axis current andthe electromagnetic torque and between the direct-axis current and the electromagnetic torque in the permanent magnet synchronous motor; and controlling the permanent magnet synchronous motor to operate according to the target quadrature-axis current and the target direct-axis current. The scheme can improve the efficiency of the permanent magnet synchronous motor.

Description

technical field [0001] The invention relates to the technical field of electrical engineering, in particular to a method, a device and a computer-readable medium for controlling the maximum torque-to-current ratio of a motor. Background technique [0002] Permanent magnet synchronous motor (permanent-magnet synchronous motor, PMSM) has the advantages of simple structure, small size, light weight, low power factor, etc., and is widely used in various industries of industrial production. The electromagnetic torque of the permanent magnet synchronous motor is determined by the flux linkage and the torque current, and the flux linkage is determined by the permanent magnet and the weak / strong magnetic current component, so under the premise that the permanent magnet synchronous motor produces the same electromagnetic torque, the torque current It may not be the same. The permanent magnet synchronous motor is controlled by the method of maximum torque current ratio control (Maximu...

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Problems solved by technology

[0004] Aiming at the current maximum torque-to-current ratio control method for permanent magnet synchronous motors, the relationship between the quadrature-axis current and the direct-axis current under the condition of satisfying the maximum torque-to-current ratio control is linearized, and then through the relationship between the quadrature-axis current and the direct-axis current The linear relationship between them is used to solve the quadrature-axis current and the direct-axis current. Since the maximum torque-current ratio control of the permanent magnet synchronous motor is only approximated, but the maximum torque-current ratio control of the permanent magnet synchronous motor is not actually realized. Resulting in lower efficiency of permanent magnet synchronous motors

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