Permanent magnet synchronous motor driving system capable of switching winding

Abstract

The invention discloses a permanent magnet synchronous motor driving system capable of switching a winding. According to the permanent magnet synchronous motor driving system, a winding switch conversion device with a simple structure is utilized to realize automatic reconstruction of the winding. Meanwhile, operation switching of the low-speed and high-speed windings is realized with combination of double-inverter coordination control and flux weakening control so that range of operation rotating speed of the driving system is substantially widened, and operation efficiency and fault tolerance performance of the system are enhanced. In the low-speed state, single-inverter double-winding operation is performed; in the intermediate-speed state, double-inverter double-winding operation is performed; and in the high-speed state, firstly permanent magnet synchronous motor terminal voltage is limited by utilizing the flux weakening control mode, then the winding is switched and single-inverter single-winding operation is performed. A double-inverter circuit is adopted so that working modes of the system are flexible and various, i.e. both single-inverter operation and double-inverter operation can be realized, and thus the system has certain fault tolerance capability.

Description

technical field [0001] The invention relates to a drive system of a permanent magnet synchronous motor, in particular to a drive system of a permanent magnet synchronous motor with switchable windings. Background technique [0002] Due to the outstanding advantages of high efficiency and high torque / power density, the permanent magnet synchronous motor drive system has gradually become one of the important development directions of modern electric traction systems such as hybrid electric vehicles and pure electric vehicle drive systems. However, for electric vehicles such as electric vehicles, the operating speed range is very wide, so the speed regulation range of the drive system is required to be high, and the ratio of the maximum speed to the base speed reaches or exceeds 5:1. The permanent magnet synchronous motor has the inherent problem that the air gap magnetic field is difficult to adjust after it is manufactured. With the increase of the speed in the speed control ...

AI Technical Summary

Problems solved by technology

For example, patent 101911473A discloses a winding switching device for a three-phase AC motor. The device is connected to the separation part of the stator winding to realize the working switching of different parts of the stator winding, so that the winding switching between high speed and low speed of the motor can be realized, but there is no An effective control method for winding switching is given

However, due to the switching between different windings, the output torque has a sudden change during the switching process, which will inevitably bring a great impact on the dynamic performance of the entire speed control system.

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