Current feed forward-voltage feedback flux weakening control method for electromobile permanent magnet synchronous motor

Abstract

The invention discloses a current feed forward-voltage feedback flux weakening control method for an electromobile permanent magnet synchronous motor. The current signals of the built-in electromobilepermanent magnet synchronous motor are collected, and the conversion of coordinates is carried out to obtain stator current direct-axis component and stator current quadrature-axis component; voltagesignals are collected to obtain voltage source inverter direct current bus voltage; rotary transformer signals on the built-in permanent magnet synchronous motor are collected, and the rotor positionangle and mechanical rotating speed of the motor are obtained through calculation; and a blurry PI feedback link is added on the basis of a traditional formula computing method. For the purpose thatthe motor is smoothly and stably switched in a constant torque region and a constant power region, a smooth switching method based on a weighting function is proposed. The method disclosed by the invention is simple and practicable, the dynamic performance of the motor in the constant power region can be improved effectively, the method has relatively high parameter robustness, and the method canbe smoothly and stably switched in the constant torque region and the constant power region.

Description

technical field [0001] The invention relates to a permanent magnet synchronous motor. In particular, it relates to a current feedforward-voltage feedback field weakening control method for a permanent magnet synchronous motor of an electric vehicle. Background technique [0002] Due to the advantages of high power density, high reliability and high efficiency, the interior permanent magnet synchronous machine (Interior Permanent magnet synchronous machine, IPMSM) has been widely used in electric vehicles, machine tool spindle drive systems and other demanding speed control drive systems. Wide range of applications. With the continuous improvement of the performance of the microprocessor and the continuous improvement and optimization of the motor control algorithm, in addition, the body design of the permanent magnet synchronous motor is also continuously optimized. The permanent magnet synchronous motor drive system has been favored by scholars at home and abroad in recent...

AI Technical Summary

Problems solved by technology

Most of the traditional classic field weakening control strategies are based on the mathematical model of the motor, and the control algorithm is easily affected by changes in the external environment such as motor parameter changes and load disturbances.

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