Maximum torque control method for salient-pole permanent-magnet synchronous motor

Abstract

The invention provides a maximum torque control method for a salient-pole permanent-magnet synchronous motor, which is characterized in that vector control on the motor is carried out by a d-axis current instruction id* and a q-axis current instruction iq* under the synchronous rotation coordinate system of a rotor, thus realizing the aim of outputting maximum torque of the motor. Compared with the traditional control method, the maximum torque control method has the advantages of 1) offline calculating current instruction values, controlling in real time by only searching; greatly simplifying real-time operation; and reducing the requirement on the processing capability of a controller; 2) combining a table searching of d-axis current instruction with the precise calculation of q-axis current instruction, thus reducing the error caused by the table searching; and improving torque control precision.

Description

technical field [0001] The invention relates to a vector control method of a salient pole permanent magnet synchronous motor, in particular to a d-axis current command i capable of realizing maximum torque control d * , q-axis current command i q * The invention discloses a method for generating electric current, which belongs to the technical field of AC motor transmission. Background technique [0002] Permanent magnet synchronous motors are widely used in electric traction systems, including high-speed railway electric drive systems, automobile electric drive systems, elevators, etc. Toothless traction system, etc. [0003] The salient pole permanent magnet synchronous motor adopts the structure of the permanent magnet embedded in the rotor, which has a larger salient pole ratio than the surface mount type, and can generate large reluctance torque and high-efficiency output torque. The core of the vector control of the salient pole permanent magnet synchronous motor ...

AI Technical Summary

Problems solved by technology

[0006] The defect of the method described in CN101626216A is that in order to generate the optimal vector control current value under the specific torque, it is necessary to implement the motor to measure the current under various torque conditions to determine the most suitable d-axis current i d , q-axis current i q operation, the generation process is complex

The field weakening module is introduced in the adjustment process above the base speed, and the direct axis current command i d * compensating without taking into account i q This will inevitably cause the current operating point to deviate from the requirement of maximum torque control

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