Rotor position estimating method for sensorless switched reluctance motor

Abstract

The invention discloses a rotor position estimating method for a sensorless switched reluctance motor. The method comprises the steps: fully considering the real-time requirements of a sensorless position estimating algorithm when a switched reluctance motor runs at high speed and at super speed, obtaining the highest inductance position through a method combining inductance gradient zero-crossing pulse detection with transformer electromotive force and motion counterelectromotive force intersection point estimating pulse detection (i.e., an estimating method for position alignment of a stator and a rotor), and then estimating the rotating speed and the position of the rotor by utilizing an electric angle difference between every two adjacent electric periods and recording a time interval difference. Transformer electromotive force and motion counterelectromotive force can be effectively prevented from being calculated at the same time, complex table storage, complex model building, complex algorithms and other complex links can be avoided, extra hardware resources are not needed, the real-time performance, rapidity and reliability of position estimation can be guaranteed, and controller resources can be given full play. The method plays an important role in controlling the high-speed running and the super-speed running of a switched reluctance motor.

Description

technical field [0001] The invention relates to a rotor position estimation method, in particular to a rotor position estimation method suitable for high-speed and ultra-high-speed switched reluctance motors without a position sensor, and belongs to the technical field of detection and control of switched reluctance motors. Background technique [0002] Due to its simple structure and robustness, switched reluctance motors are suitable for high-speed operation and harsh working environments, and have good application prospects in many occasions such as aerospace, electric vehicles, ships, and distributed power systems. However, obtaining accurate rotor position information is a prerequisite to ensure high-performance motor control. However, the introduction of traditional photoelectric, electromagnetic, and magnetic-sensitive position or speed sensors will not only increase the cost and complexity of the system, but also reduce the reliability and environmental adaptability ...

AI Technical Summary

Problems solved by technology

However, the research results show that the phase current gradient method must meet the condition that the back EMF in the rising area of ​​the conduction phase inductance is greater than the voltage across the winding, and at the same time, the complexity of the system is increased due to the addition of some signal conditioning circuits

The combination of phase inductance slope zero-crossing and phase current slope zero-crossing can effectively avoid the problems existing in the current gradient method, but the premise must meet the strict single pulse waveform of the winding current, the jitter of the current waveform or the instability of the calculation of the current slope , may estimate the wrong position detection pulse, thus limiting the application range of the current gradient method

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