Design for the Interior Permanent Magnet Synchronous Motor Drive System Based on the Z-Source Inverter

Shuai Dong,Rui Wang,Qianfan Zhang,Hongwei Ma

doi:10.3390/en12173350

Shuai Dong, Rui Wang + Show 2 more

Open Access

https://doi.org/10.3390/en12173350

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Journal: Energies	Publication Date: Aug 30, 2019
Citations: 4	License type: CC BY 4.0

Affiliation: Harbin Institute of Technology

Abstract

The permanent magnet synchronous motor (PMSM) running above the base speed requires flux-weakening control, which is usually realized by the direct-axis demagnetization current generated by the vector control, thus leading to a decrease in the system efficiency in the flux-weakening region. In addition, the motor power output range is limited by the inverter output voltage and current level. In this paper, a Z-Source drive PMSM control system with adjustable DC-link voltage was proposed to improve the efficiency of the motor system. The proposed system was experimentally verified. The response time of DC-link voltage is 10 ms and the overshoot is 3%, indicating good dynamic characteristics. Compared with the flux-weakening scheme, the Z-Source inverter scheme can achieve higher efficiency (about 3%) when the PMSM speed was set to 650 r/min.

Highlights

The motor and its control system are the key core components of electric vehicles [1]
A bus voltage-adjustable permanent magnet synchronous motor (PMSM) drive system based on voltage-type Z-Source inverter
The results showed that the system had good dynamic and steady-state characteristics

Summary

Introduction

The motor and its control system are the key core components of electric vehicles [1]. The permanent magnet synchronous motor (PMSM) drive system has high efficiency and high-power density, so it has become the preferred drive system in all types of electric vehicles. In the hybrid car Prius, which has the largest share in the global market at present, both the main drive motor and starting generator adopt the PMSM system. In the motor drive system powered by storage battery or super-capacitors used in electric vehicles, two schemes are generally adopted to increase the motor speed: flux-weakening control and increasing the DC-link voltage. Compared with the surface PMSM, the interior PMSM is more suitable for the flux-weakening speed-rising due to the reluctance torque produced by the inconsistent rotor inductance between the direct axis and quadrature axis [5,6]

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Conclusion