Self-adaption method of zero compensation detection of rotary transformer of permanent magnet motor

Abstract

The invention discloses a self-adaption method of zero compensation detection of a rotary transformer of a permanent magnet motor. The rotary transformer detects the rotate speed, the direction of rotation and the rotor position of the permanent magnet motor; three current sensors respectively detect direct current bus current Idc, motor V-phase current Iv and motor U-phase current Iu, and rotor d shaft current Id and rotor q shaft current Iq are obtained by means of CLARK conversion and PARK conversion through a micro-programming controller; the permanent magnet motor is adjusted to be in a zero torque control mode, at the moment the Id equals to flux-weakening current and the Iq equals to zero; when a magnetic field of the permanent magnet motor is zero position alignment, the Idc is approximate to zero; in case that the zero position of the magnetic field deviates, the Idc is not approximate to zero; a rotary transformer deviation angle is regulated and rotated through the micro-programming controller until the Idc is approximate to zero and a rotor of the permanent magnet motor and a d shaft coincide. The self-adaption method can detect the accurate position of a motor rotor in real time, avoids a process of zero compensation manual calibration, improves torque control accuracy of a motor and system security, and is suitable for mass manufacturing of the motor.

Description

technical field

[0001] The invention relates to an adaptive method for detecting zero position compensation of a rotary transformer of a permanent magnet motor. Background technique

[0002] Permanent magnet motors are widely used in hybrid vehicles and industrial servo systems. For mass-produced permanent magnet motors, due to current processing technology issues and cost considerations, the resolver of each permanent magnet motor is used to detect the magnetic field zero of the permanent magnet motor. There is a certain deviation in the position, and the current development trend of permanent magnet motors is miniaturization and low cost, which makes the flux linkage of permanent magnet motors generally designed to be very large. The requirements for zero detection of the magnetic field of permanent magnet motors are very high. If the zero position of the magnetic field of the permanent magnet motor cannot be accurately detected, there will be obvious deviations in the ou...

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