scholarly journals Efficiency Optimization Strategy of Permanent Magnet Synchronous Motor for Electric Vehicles Based on Energy Balance

Symmetry ◽  
2022 ◽  
Vol 14 (1) ◽  
pp. 164
Author(s):  
Wenhui Pei ◽  
Qi Zhang ◽  
Yongjing Li
Keyword(s):  
Energy Balance ◽  
Hamiltonian System ◽  
Permanent Magnet ◽  
Balance Equation ◽  
Permanent Magnet Synchronous Motor ◽  
Energy Balance Equation ◽  
Synchronous Motor ◽  
Optimization Strategy ◽  
Loss Model ◽  
Efficiency Optimization

This paper presents an efficiency optimization controller for a permanent magnet synchronous motor (PMSM) of an electric vehicle. A new loss model is obtained based on the permanent magnet synchronous motor’s energy balance equation utilizing the theory of the port-controlled Hamiltonian system. Since the energy balance equation is just the power loss of the PMSM, which provides great convenience for us to use the energy method for efficiency optimization. Then, a new loss minimization algorithm (LMA) is designed based on the new loss model by adjusting the ratio of the excitation current in the d–q axis. Moreover, the proposed algorithm is achieved by the principle of the energy shape method of the Hamiltonian system. Simulations are finally presented to verify effectiveness. The main results of these simulations indicate that the dynamic performance of the drive is maintained and the efficiency increase is up to about 7% compared with the id=0 control algorithm, and about 4.5% compared with the conventional LMA at a steady operation of a PMSM.

scholarly journals Uncontrolled Generation Analysis and System Optimization of Permanent Magnet Synchronous Motor for Electric Vehicle

2019 ◽  
Vol 37 (2) ◽  
pp. 258-265
Author(s):  
Liao Zhang ◽  
Chao Gong ◽  
Jinglin Liu
Keyword(s):  
Steady State ◽  
Permanent Magnet ◽  
High Speed ◽  
Permanent Magnet Synchronous Motor ◽  
System Optimization ◽  
Synchronous Motor ◽  
Optimization Strategy ◽  
Protection Scheme ◽  
The Status ◽  
Current Flows

When a permanent magnet synchronous motor(PMSM) which is controlled by flux-weakening strategy rotates in high speed, the controller would send the turning-off signals to switch off all the transistors quickly if faults(e.g. overvoltage and overcurrent) occur. At this moment, the equivalent electromotive force is higher than battery voltage due to the high speed of motor, so the current flows into the battery through the uncontrolled rectifier bridge composed of six freewheeling diodes, resulting in the drive system works at the status of uncontrolled generation(UCG). Firstly, the mathematical model of the system is established. Then, according to the theoretical analysis, the UCG process is divided into three stages: transistors turning-off stage, diodes freewheeling and turning-on stage and steady-state UCG stage. It is found that the steady-state UCG process has the shortcomings of large current and long time. Therefore, an optimal protection scheme based on fuzzy control is proposed, which can reduce danger damage of UCG. Finally, simulation and experiment are adopted to study the process of UCG, and the effectiveness of the optimization strategy is verified.

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