Compensation method for high-speed position detection error in three-phase electrically excited doubly salient motor

Abstract

The invention discloses a compensation method for high-speed position detection error in a three-phase electric excitation doubly-salient motor. According to the method, the flux linkage differences of any two phases of the motor are detected; and flux linkage components generated by an armature winding are subtracted from the flux linkage differences, so that influence on the zero crossing point of the positive-to-negative conversion of the flux linkage differences caused by armature reaction can be eliminated. Compared with the prior art, the compensation method of the invention can reduce position observation error caused by the armature reaction and realize accurate phase commutation and stable operation of the electric excitation doubly-salient motor with no position sensors.

Description

technical field [0001] The invention belongs to the field of motor control, and relates to a position sensorless control method of an electrically excited double salient pole motor. Background technique [0002] Due to its simple structure, high reliability, and flexible air gap flux adjustment, electrically excited double salient motors have broad application prospects in aviation, new energy and other fields. Like the brushless DC motor, when the motor is used in the drive system, it needs to detect the rotor position to achieve accurate commutation. The additional sensor reduces the reliability of the system, increases the cost, and limits the application range of the motor. Therefore, the research on the electric excitation dual The position sensorless operation technology of salient pole motor is of great significance. [0003] At present, the position detection method based on flux linkage has been widely researched and applied in other motors, but little research has...

AI Technical Summary

Problems solved by technology

This patent application utilizes the characteristic that the zero-crossing position of the line flux linkage of the three-phase electric excitation doubly salient motor coincides with the commutation position, but the line flux linkage detected by this method also includes the armature winding The generated flux linkage component, when the motor is loaded and running, its zero-crossing position from positive to negative will still lead due to the influence of armature reaction, if it is not compensated, it will easily lead to commutation failure

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