Single-supply open-coil winding permanent magnet synchronous motor driving system for electric vehicles

Abstract

The invention relates to a single-supply open-coil winding permanent magnet synchronous motor driving system for electric vehicles. Six end leads of a stator winding of a three-phase permanent magnet synchronous motor are respectively connected to two standard two-level inverters. The driving system is supplied power by a direct-current power supply, and generates a rotary circular magnetic field by voltage space vector generated after space vector pulse width modulation. The driving system comprises a direct-current voltage source (1), a first inverter (2), a second inverter (3), a capacitor (4), an open-coil winding permanent magnet synchronous motor (5) and a common-mode voltage suppression vector (6). The first inverter is connected to one end of the winding of the permanent magnet synchronous motor, and the second inverter is connected to the other end of the winding. The drying system has advantages of a three-level inverter and can be applied to the field of driving of high-voltage high-power motors; while quantity of power devices is reduced. Owning to the compact design of the single supply, reliability of the driving system is improved. In addition, the effect of suppressing common-mode voltage can be achieved by effectively selecting the voltage space vectors on the basis of not increasing redundant switch devices.

Description

technical field [0001] The invention relates to a single-power open-winding permanent magnet synchronous motor drive system for electric vehicles, which can be applied to high-voltage and high-power drive occasions and belongs to the motor drive technology. Background technique [0002] Permanent magnet motors have the advantages of high power density and large output, and can meet the requirements of low speed, high torque and high power density, but there are problems such as narrow adaptable speed range, difficulty in speed up and voltage regulation control in field weakening. For this reason, scholars from various countries have proposed various improvement measures for permanent magnet motors, such as improving the structure and magnetic circuit of permanent magnet motors, and proposing new hybrid excitation structures and special control strategies. However, the power density, efficiency and other performances of the permanent magnet motor are sacrificed, which reduces...

AI Technical Summary

Problems solved by technology

[0003] Technical problem: The present invention proposes a single power supply for electric vehicles in view of the problems of low drive power levels, common-mode voltages, and difficulties in voltage regulation in existing drive systems for electric vehicles under the limitations of vehicle battery capacity and power switch voltage and current capabilities. The drive system of the open-winding permanent magnet synchronous motor solves the problems of low inverter drive power density, large output voltage harmonics and difficulty in field-weakening speed regulation in the existing drive system. Improved space vector modulation technique to suppress common-mode voltage

Images