Rotor position estimation method of three-stage electro-magnetic brushless synchronous motor with variable salient pole characteristic

Abstract

The invention relates to a rotor position estimation method of a three-stage electro-magnetic brushless synchronous motor with variable salient pole characteristic. The rotor position estimation method is a rotor position estimation method, based on high-frequency signal injection with different frequencies, of the three-stage electro-magnetic brushless synchronous motor with the variable salient pole characteristic and is a position estimation method for a high-frequency response current signal when rotation square waves with different frequencies are injected to a stator winding of a main power generator and the rotor position information of the main power generator is detected to be contained in a stator side of an excitation machine. The three-stage motor position information estimation method has the following advantages that: 1) the electro-magnetic motor is used as a rotation transformer, the stator winding and a rotor winding of the motor are equivalent to an input winding and an output winding of the transformer, the characteristic of mutual inductance changing with a rotor position between an armature winding and an excitation winding of the main power generator is fully utilized, the influence of salient pole change of the main power generator is prevented, and the method has universality on a winding type motor; and 2) the solution process is relatively simple, and the estimation accuracy is relatively high.

Description

technical field [0001] The invention belongs to the technical field of AC motor transmission control, and relates to a method for estimating the rotor position of a three-stage electric excitation brushless synchronous motor with variable salient pole characteristics. Background technique [0002] The integrated system of starting / power generation can save the special starting mechanism and effectively reduce the weight of the aircraft. The three-stage electric excitation brushless synchronous motor (hereinafter referred to as the three-stage motor), as the generator commonly used in the current aircraft AC power system, is favored by researchers of starting / power generation integration technology due to its mature structure and high reliability. In the starting process, the accurate acquisition of the rotor position is the key to the successful ignition of the three-stage motor as a motor to drive the engine. The complex and changeable aviation environment restricts the us...

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Problems solved by technology

[0007] In order to avoid the deficiencies of the prior art, the present invention proposes a method for estimating the rotor position of a three-stage electric excitation brushless synchronous motor with variable saliency characteristics, which solves the problem that the current rotor position estimation method is difficult to realize the accurate position estimation of a three-stage motor The problem

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