Method and system for automatically correcting initial position of rotary transformer of electric vehicle

Abstract

The invention discloses a method for automatically correcting an initial position of a rotary transformer of an electric vehicle. The method comprises: a motor is in an idle state; according to presetduration time, counter electromotive force signals and rotary transformer position signals of the motor are detected periodically; an average offset value theta1 of the counter electromotive force signals and the rotary transformer position signals during N1 periods as well as an average offset value thetan of the counter electromotive force signals and the rotary transformer position signals during Nn periods is calculated; when the |theta1-thetan|is less than theta0, an initial position of a rotary transformer is adjusted and the adjusting angle is as follows: theta=(theta1+thetan) / 2, wherein the theta0 is an allowable offset value. According to the invention, the offsets of the counter electromotive force signals and rotary transformer position signals are detected when the motor is inan idle state; the initial position of the rotary transformer is corrected and adjusted to ensure the high position precision requirement of the rotary transformer; the installation accuracy requirement and the production cost of the initial position of the rotary transformer are reduced; and the output accuracy of the torque of the motor is improved.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a method for automatically correcting the initial position of a rotary transformer of an electric vehicle. The invention also relates to an automatic correction system for the initial position of the resolver of the electric vehicle and an electric vehicle. Background technique [0002] With the continuous depletion of chemical energy and the aggravation of environmental pollution, electric vehicles are increasingly used in the market. As an indispensable system component of electric vehicles, the driving motor and motor controller provide driving force for the whole vehicle. [0003] The vector control technology usually used in the control of permanent magnet synchronous motors for electric vehicles requires accurate motor rotor position to judge the position of the motor magnetic poles, and then realize precise control of torque. The more accurate the motor rotor position mea...

AI Technical Summary

Problems solved by technology

In this way, a lot of time and energy will inevitably be spent on the installation and operation of the motor resolver before the motor leaves the factory, which increases labor costs and reduces production efficiency

Moreover, when testing on the test bench, when the number of tests is large, test deviations are prone to occur, resulting in the problem of poor consistency of the initial position of the resolver

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