Three-mode motor and control method thereof

Abstract

The invention discloses a three-mode motor. The motor is a three-phase permanent magnet motor. The motor is provided with a three-phase winding connected with a three-phase power source in a star connection mode. Each phase of winding unit of the three-phase winding is composed of four windings with the same number of turns, when the motor runs in a low-speed mode, the four windings of each phase of winding unit are connected in series, when the motor runs in a middle-speed mode, the four windings of each phase of winding unit are connected in series pairwise and then connected in parallel, two star center points are formed by each phase, and when the motor runs in a high-speed mode, the four windings of each phase of winding unit are connected in parallel, and four star center points are formed by each phase. Different rotating speeds of the motor are matched with different states, the efficiency of the low-speed section and the high-speed section of the motor is obviously improved, low-speed starting efficiency is improved, torque is increased, restarting of a watchdog is allowed, and the requirement on the technical reliability of a controller is obviously lowered.

Description

technical field [0001] The invention relates to the field of speed-regulating motors. Background technique [0002] The driving motor of electric vehicles requires the motor to be highly efficient and reliable from 0 speed to the highest speed. The mechanical gear shifting method is used to match the speed and efficiency range of the motor, and the structure is complex and the cost of mechanical shifting is high. The popular speed-up method of motor control algorithm, that is, the rated speed of motor design is relatively low, and the method of speed-up by weakening magnetic field at high speed seems to perfectly solve the requirements of electric vehicle motors, so it has been widely promoted. With the continuous development of electric vehicles, the increase in output and the continuous increase in vehicle speed, the disadvantages of the field-weakening control motor are gradually obvious, the efficiency drops sharply at high-speed operation, and the power consumption at ...

AI Technical Summary

Problems solved by technology

[0005] 1. The problem of high speed and low efficiency;

[0006] 2. The problem of abnormal dragging may occur at high speed;

[0007] 3. The problem that the watchdog circuit of the controller is not allowed to trigger the start and the defect that the reliability of the controller is too high

Images