On-line Suppression Method of Rotor Position Offset Error of Permanent Magnet Synchronous Motor

Abstract

An online suppression method for rotor position offset error of a permanent magnet synchronous motor belongs to the field of motor control. The method for suppressing the existing rotor position offset error of the present invention requires offline measurement, and has the problems of low signal-to-noise ratio and large current amplitude fluctuation. Including: injecting the high-frequency square wave voltage signal into the γ-δ shaft system, and identifying the original rotor position estimate based on the high-frequency mathematical model of the permanent magnet synchronous motor established under the γ-δ shaft system; based on the motor electromagnetic torque equation, Using the two current vector amplitudes and their corresponding current vector angles that can be adaptively adjusted according to the load conditions at adjacent moments, the rotor position offset error existing in the original rotor position estimation value is calculated and obtained; according to the rotor position offset error On-line compensation is performed on the original rotor position estimate to realize on-line suppression of rotor position offset error. The invention effectively avoids the problems of low signal-to-noise ratio and large current amplitude fluctuation in the error detection process.

Description

technical field [0001] The invention relates to an online suppression method for rotor position offset error of a permanent magnet synchronous motor, and belongs to the field of motor control. Background technique [0002] With the development of the world's industrialization process, the motor has always been an important link in the electromechanical energy conversion process. In recent years, permanent magnet synchronous motors have become an ideal choice for variable frequency speed regulation electrical drive systems and new energy vehicle industries due to their simple structure, small size, high power density, high efficiency, and good speed regulation performance. There is a more prominent performance. [0003] In the application of high-performance permanent magnet synchronous motor speed control system, rotor position information is a necessary condition for signal decoupling control. In the industry, mechanical position detection elements such as photoelectric e...

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Problems solved by technology

[0006] In view of the fact that the existing suppression method of rotor position offset error requires offline measurement, and there are problems of low signal-to-noise ratio and large current amplitude fluctuation, the present invention provides an online suppression method for permanent magnet synchronous motor rotor position offset error

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