High-efficiency control method for permanent magnet synchronous motor

Abstract

The invention discloses a high-efficiency control method for a permanent magnet synchronous motor. The high-efficiency control method comprises the step of: screening a low-speed MTPA (maximum torquecurrent ratio) working point, i.e., a first working region working point, through using a motor parameter correlation formula; acquiring a group of high-speed weak magnetic voltage limit elliptical working points through bench testing; importing data obtained by bench testing into MATLAB, and fitting rest working points of the second working region by utilizing a data fitting toolbox of the MATLAB; merging all the obtained points into a table by taking a stator phase voltage peak value as a boundary; and querying the generated table according to the given moment and the feedback speed to directly obtain the optimal working current in the current state. By adopting the high-efficiency control method, the table data is few, and the occupied storage space is small; and motor operation regionsare separately processed, and current compensation is performed in a weak magnetic voltage limit oval region so that control is enabled to be more comprehensive and accurate.

Description

technical field [0001] The invention belongs to the technical field of motor drive control. More specifically, the present invention relates to a high-efficiency control method for a permanent magnet synchronous motor. Background technique [0002] With the continuous development of the economy, the number of automobiles has increased rapidly. In the era when the country vigorously advocates environmental protection, electric vehicles have become an inevitable development trend. As the core component of electric vehicles, the electric vehicle motor drive control system is the fundamental guarantee for improving the driving performance, mileage, reliability and safety of electric vehicles. The drive system of electric vehicles requires torque-speed characteristics with a wide range of vehicle speeds and large load changes. [0003] The traditional proportional-integral (PI) regulator is prone to overshoot and oscillation adjustment process, and the dynamic performance is af...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a high-efficiency control method for a permanent magnet synchronous motor, the purpose of which is to improve the accuracy of the direct axis current and the quadrature axis current in the full speed range, and realize the precise control of the torque of the permanent magnet synchronous machine, so as to solve the problem of traditional current loop regulation Problems such as wide range and slow response speed

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