Method and system for position estimation of switched reluctance motor on the basis of pulse current envelope

Abstract

The present invention discloses a method and system for position estimation of a switched reluctance motor on the basis of a pulse current envelope, belonging to the field of the switched reluctance motor control technique. The method for position estimation of the switched reluctance motor on the basis of the pulse current envelope comprises: performing initialization setting, extracting a pulse current envelope of a non-conducting region, extracting a pulse current envelope of a conducting region, extracting a complete period pulse current envelope, and determining positions, etc. The system for position estimation of the switched reluctance motor on the basis of the pulse current envelope comprises: an initialization module, a module of extracting a pulse current envelope of a non-conducting region, a module of extracting a pulse current envelope of a conducting region, a module of extracting a complete period pulse current envelope, and a position determination module. The method and system for position estimation of a switched reluctance motor on the basis of a pulse current envelope are simple, are capable of effectively estimating a position of a motor rotor, and are high in versatility, with no need for additional hardware.

Description

technical field [0001] The invention relates to a method and system for estimating the position of a switched reluctance motor, in particular to a method and system for estimating the position of a switched reluctance motor based on a pulse current envelope. Background technique [0002] In the application field, the switched reluctance motor needs the rotor position signal. At present, the rotor position signal is mainly obtained by the direct position detection method. This method is to add a position sensor to the motor to obtain the position signal. Typical examples include electromagnetic type and photoelectric type. , magnetosensitive, etc., among which photoelectric sensors are the most widely used, but these traditional mechanical sensors have complex structures and are inconvenient to install, which not only increases the complexity of the system structure, but also reduces the reliability of the system and increases the cost, restricting the Switched reluctance mot...

AI Technical Summary

Problems solved by technology

The advantage of injecting high-frequency pulses into the previous non-conducting phase is that it is simple and easy to implement, but the disadvantage is that it will generate negative torque

The advantage of the method of injecting high-frequency pulses into the latter non-conducting phase is that the accuracy of motor commutation is improved, and the commutation position is at the moment when the inductance just rises, the inductance change rate is large, and the peak value of the pulse current is also very large, which is easy for the microprocessor The disadvantage is that during the pulse injection process, the pulse current is in a symmetrical state with the minimum center position of the inductance. In this way, it is necessary to judge the direction of the pulse current amplitude change during the commutation process in order to finally judge the commutation time.

The advantage of this method is that it does not need to set the current threshold and is not affected by voltage and load fluctuations. It has certain robustness, but the influence of motor saturation needs to be considered.

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