Multi-stage brushless motor initial position detection method based on signal reverse transmission

Abstract

The invention relates to a signal inverse transfer-based multi-stage type brushless motor initial position detection method. An alpha axis and a beta axis of a main generator stator are injected with a high-frequency square signal separately, and a corresponding response signal is inversely transferred to an exciter through a rotary rectifier; a main generator rotor initial position signal is extracted from the stator current of the exciter; according to the method, based on the characteristic that the mutual inductance between a main generator stator winding and an exciting winding is changed along with rotor position changes, a salient pole effect of the main generator is not needed, and a resolving process is relatively simple, and the rotor initial position detection precision is relatively high. The method has the following advantages: 1) based on the characteristic that the mutual inductance between a main generator armature winding and the exciting winding is changed along with rotor position changes completely, influence from the salient pole changes of the main generator can be avoided, so that the method has relatively high applicability to the electric exciting motor; and 2) the resolving process is relatively simple, and the initial position detection precision is relatively high.

Description

technical field [0001] The invention belongs to the technical field of AC motor drive control, and relates to a method for detecting the initial position of a multi-stage brushless motor based on signal reverse transmission, and a multi-stage brushless motor rotor based on a high-frequency signal reversely transmitted from a main generator to an exciter The initial position detection method is a detection method in which high-frequency signals are separately injected into the alpha phase winding and beta phase winding of the main generator stator, and the initial position information of the main generator is extracted from the exciter stator current. Background technique [0002] The starter / power generation integrated system based on the multi-stage brushless motor can save the special starter mechanism and effectively reduce the weight of the aircraft. Multi-stage brushless motors (hereinafter referred to as multi-stage motors) are commonly used generators in aircraft AC p...

AI Technical Summary

Problems solved by technology

[0006] In order to avoid the shortcomings of the prior art, the present invention proposes a multi-stage brushless motor initial position detection method based on signal reverse transmission, which solves the problem that the current rotor initial position detection method is difficult to accurately detect the initial position of the multi-stage motor question

Images