Full-speed position-less sensor technology for aviation starting power generation system

Abstract

The invention discloses a full-speed position-less sensor technology for an aviation starting power generation system based on coaxial running of a permanent magnet motor and a starting generator. A main motor is coaxially connected with the permanent magnet motor when serving as the starting generator, the permanent magnet motor is not connected into the system and is in no-load power generation running when the system is started, and counter potential is not easily interfered. After the number of poles of stators and rotors of the permanent magnet motor and the starting generator is determined, the positional relation among the stators and the rotors of the starting generator and the permanent magnet motor which are coaxially connected is determined according to relations among positional change of a stator and a rotor of a simulation permanent magnet motor and various phase line potentials and the 0-degree mechanical angle position of the starting generator, the initial position of the starting generator is judged according to injection pulse, the motor is started by a current response method, and a phase change point of the starting generator is determined by detecting a zero crossing point of a reference phase line potential of the permanent magnet motor when the rotating speed reaches a threshold value. The technology overcomes the shortcomings that magnetic property detection is easily interfered and the like when the starting generator electrically runs, and the technology is a simple and convenient full-speed position-less control strategy.

Description

technical field [0001] The invention relates to a position sensorless control method for an aviation starter generator, which belongs to the technical field of motor control. Background technique [0002] In the aviation electromechanical system, the use of starting / generating integration technology can not only effectively reduce the weight of the aircraft, increase the power density, and improve the reliability, but also facilitate the integration of the generator and the engine, improve the surge margin of the engine and reduce fuel consumption etc. have obvious advantages. However, the starter generator needs to complete the whole process from static start to high-speed operation to engine ignition. In order to ensure the reliable operation of the system and realize the high-performance control of the motor, a position sensor is essential. Commonly used position sensors include electromagnetic position sensors (such as open transformers, ferromagnetic resonance circuits...

AI Technical Summary

Problems solved by technology

[0006] On the basis of the proposed method of starting and accelerating the electric excitation double salient pole motor without position sensor based on the current response of the commutation point, the present invention utilizes a three-stage electric excitation synchronous motor and an electric excitation double salient pole motor etc. The permanent magnet motor running coaxially with it is not connected to the system during operation, and can be in the state of no-load power generation. Only when the starter generator is running for power generation, the permanent magnet motor running coaxially needs to be rectified to provide excitation current after power generation. Combined with the starter generator Based on the driving circuit and electromagnetic characteristics of the permanent magnet motor and the potential characteristics of the permanent magnet motor during power generation, a novel full-speed position sensorless technology for the coaxial connection of the permanent magnet motor and the starter generator used in the aviation starter generator system is proposed. The problem to be solved is: to overcome the weakness that the back electromotive force cannot be detected when the starter generator is running at low speed, and the current chopper detection is easily disturbed, and the terminal voltage is easily disturbed when the starter generator is running at high speed. The problem that the electromagnetic characteristics of the starter generator are easily disturbed by the excitation current and load changes when the starter generator is running in the full speed range fully considers the change law of the line potential of the permanent magnet motor for power generation and the relationship with the commutation point of the starter generator. In this paper, the advantages of permanent magnet motors that are not easily disturbed during no-load power generation are obtained, and a reliable and easy-to-implement position sensorless control strategy for starter generator operation is obtained. The foundation for smooth sensor operation

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