Zero adjustment method for rotary transformer of permanent magnet motor

Abstract

The invention provides a zero adjustment method for a rotary transformer of a permanent magnet motor. The method comprises the steps that an upper computer sends a rotary transformer zero adjustment instruction to a motor controller through a CAN bus; the motor controller increases the d-axis instruction voltage ud by taking 0.0001 as a step, the q-axis instruction voltage uq is zero, and the rotor position angle instruction is 0 degree; the A-phase winding current of the motor is compared with the rotary transformer zeroing current instruction until the A-phase winding current Ia is equal to the rotary transformer zeroing current instruction, and the d-axis instruction voltage at the moment is a fixed value ud0; a rotary transformer digital quantity is read, and a rotary transformer stator is manually adjusted; the upper computer sends a motor positioning angle of 120 degrees; the rotation digital quantity of the rotor with the position angle of 120 degrees is read; a rotor position angle instruction is 240 degrees; a rotation digital quantity Ang240 is read when the position angle of the rotor is 240 degrees; and zeroing is finished. According to the permanent magnet motor rotary transformer zero adjustment method provided by the invention, the problem of rotary transformer zero adjustment under high bus voltage can be solved; and the problems of phase sequence detection and rotary transformer wiring detection of the motor are synchronously solved in the rotary transformer zero setting process.

Description

technical field [0001] The present application relates to the technical field of motor control, in particular to a method for adjusting the zero position of a resolver for a permanent magnet motor. Background technique [0002] Due to the high efficiency and high power density of the permanent magnet motor, it has become the mainstream drive motor in the field of electric vehicles. The high-quality control of the permanent magnet motor requires accurate detection of the rotor electrical angle. Resolver, referred to as resolver, is an electromagnetic sensor, also known as a synchronous resolver. It is a small AC motor for measuring angles, used to measure the angular displacement and angular velocity of the rotating object, and consists of a stator and a rotor. [0003] The reason why the permanent magnet servo motor uses an angle sensor such as a resolver is to perform vector control, so that the electromagnetic field generated by the stator winding is always orthogonal to ...

AI Technical Summary

Problems solved by technology

The prior art achieves resolver zero adjustment under low voltage, but high voltage resolver zero adjustment has not been reported; in the process of resolver zero adjustment, the motor phase sequence and resolver wiring are not detected, and there are problems of accuracy, versatility and safety

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