A fast solution method for the optimal operating point of permanent magnet motor

Abstract

The invention relates to a fast solving method for the optimal operation point of a permanent magnet motor, which belongs to the technical field of permanent magnet motors. Through carrying out electromagnetic simulation analysis on the permanent magnet synchronous motor, a certain number of optimal operation points under different rotation speeds are acquired; the torque of each optimal operationpoint of the motor under each rotation speed and current amplitude are subjected to primary fitting, the torque and a current initial phase angle are subjected to cubic fitting, and coefficients of each fitting function are recorded; data corresponding to an existing specific rotation speed are called, the fitting function is inversely solved, and any optimal operation point under the rotation speed can be acquired; when the torque and the current initial phase angle can not be fit under partial rotation speeds, a stepping method is used to search for the optimal operation point; as for rotation speeds which does not generate data, adjacent rotation speed data are used for interpolation solution; and the motor efficiency under a certain number of optimal operation points is calculated toobtain a permanent magnet motor efficiency cloud map. Each optimal operation point of the motor can be quickly searched, subsequent operation is assisted to determine the loss, the efficiency featuresand the like during the whole operation range of the motor, and a basis is provided for design of a controller corresponding to the motor.

Description

technical field [0001] The invention mainly relates to a fast solution method for the optimal working point of a permanent magnet motor, belonging to the technical field of permanent magnet motors. Background technique [0002] The permanent magnet synchronous motor has the advantages of simple structure, high efficiency and high power density. The rotor structure of permanent magnet synchronous motor is roughly divided into surface mount type and built-in type. The permanent magnets of the surface rotor structure are installed on the outer circular surface of the rotor core, and the rotation speed is generally low. The permanent magnet of the built-in permanent magnet motor is placed inside the rotor core, and the mechanical structure is more reliable. The permanent magnets of the built-in permanent magnet motor have stronger anti-demagnetization ability, and the reluctance torque generated by the asymmetry of the rotor magnetic circuit structure helps to improve the powe...

AI Technical Summary

Problems solved by technology

[0005] The present invention proposes a fast solution to the optimal operating point of the permanent magnet motor in order to overcome the current problems of slow speed and long time consumption in the process of finding the optimal operating point of the motor during the testing process of the built-in permanent magnet motor and the design of the motor controller method, which realizes the rapid search for the optimal operating point of the permanent magnet synchronous motor at each speed during the simulation process

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