Method for correcting offset angle of resolver and inverter

Abstract

The invention relates to a method for correcting an offset angle of a resolver and an inverter. The method comprises a detection step, and the detection step comprises the steps: controlling three phase currents, provided for a permanent magnet synchronous motor according to a correction current, to meet a relation IU = 2IV = -2IW = Icali in a steady state, and detecting a first angular position of a rotor at the moment through a rotary transformer, then obtaining the deviation angle of the rotary transformer by calculating the difference value between the detected first angular position and the nominal angular position, wherein IU represents a first phase current, IV represents a second phase current, IW represents a third phase current, Icali represents a correction current, and the nominal angular position is a predefined angular position reached by the rotor when subjected to only the magnetic field of the first phase current. The method provided by the invention can conveniently and accurately detect and correct the deviation angle of the rotary transformer.

Description

technical field [0001] The invention relates to the technical field of motors. In particular, the present invention relates to a method for correcting an offset angle of a resolver and an inverter performing the method. Background technique [0002] With the increasingly prominent environmental and energy issues, new energy vehicle technology has received more and more attention. Current new energy vehicles are generally equipped with motors as the driving mechanism, and permanent magnet synchronous motors (Permanent Magnet Synchronous Motor, PMSM) are more and more widely used in new energy vehicles due to their simple and compact structure and efficient power output capabilities. Applications. To be able to control a permanent magnet synchronous motor, the motor controller needs to accurately sense the angular position of the rotor rotation, which is usually measured by a resolver. When the motor is running, the magnetic field of the stator rotates synchronously with th...

AI Technical Summary

Problems solved by technology

However, this method is only applicable to the test bench, and the motor must be disassembled during the test; at the same time, it also requires engineers to operate special calibration tools or special software on site

Calibration cannot be done using the above methods without a test bench, e.g. on the vehicle or at the end of the production line

Images