Abstract

An open-end winding permanent magnet synchronous motor (PMSM) has a larger range of speed regulation than normal PMSM with the same DC voltage, and the control method is more flexible. It can also manage energy distribution between two power sources without a DC/DC converter. This paper aims at an electric vehicle equipped with OW-PMSM drive system with dual power sources and dual inverters; based on analyzing the external characteristics of each winding mode, we propose a winding mode switching strategy whose torque saturation judgmental algorithm, which is insensitive to motor’s parameters, could automatically realize upswitching of the winding mode. The proposed multi-level current hysteresis modulation algorithm could set the major power source and switch it at any time in independent mode, which accomplishes energy distribution between two power sources; its two control methods, low switching frequency method and high power difference method, could achieve different energy distribution effects. Simulation results confirm the validity and effectiveness of the winding mode switching strategy and current modulation method. They also show that an electric vehicle under the proposed control methods has better efficiency than one equipped with a traditional OW-PMSM drive system under traditional control.

Highlights

  • With more rigorous demands for energy savings and environmental protection in industry and the vigorous development of electric vehicles driven by electric motors nowadays, permanent magnet synchronous motor (PMSM) has become the typical electric motor in electric vehicles because of its advantages such as high-power density and a simple control scheme

  • We found that the motor under that the motor under the proposed multi-level current hysteresis modulation had about 30% less the proposed multi-levelthan current hysteresis had about

  • We found 15 of 22 that setting that the motor under the proposed multi-level current hysteresis modulation had about 30% less torque fluctuation than the motor under traditional two-level current hysteresis modulation

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Summary

Introduction

With more rigorous demands for energy savings and environmental protection in industry and the vigorous development of electric vehicles driven by electric motors nowadays, PMSM has become the typical electric motor in electric vehicles because of its advantages such as high-power density and a simple control scheme. A drive system constituting an OW-PMSM (open-end winding permanent magnet synchronous motor) and dual inverters has received extensive application [1,2,3,4,5]. This system is actuated via attaching both ends of OW-PMSM’s stator windings with an inverter. It allows dual inverters to use electricity from different electric sources and, when working in a dual electric sources condition, it could manage energy distribution between the two sources without a DC/DC converter [14,15,16].

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