بهینه سازی طراحی موتور سنکرون آهنربایی
Abstract
I. Introduction
II. Initially Designed IPMSM
III. Individual Sensitivity Analysis of Geometrical Parameters on Performance of the IPMSM
IV. Combined Sensitivity Analysis of Geometrical Parameters on Performance of the IPMSM
V. Optimization Results and Discussion
Authors
Figures
References
Abstract
Due to the advantages of high torque density, high efficiency, and wide constant power speed range (CPSR), interior permanent magnet synchronous motors (IPMSMs) are gaining more and more attention in electric vehicle (EV) applications. There are many geometrical parameters in IPMSMs, and some of them have significant impact on the performance of such machines. This paper presents a parametric sensitivity study of the rotor geometrical parameters for a V-shaped magnet IPMSM. In which, both the individual sensitivity and the combined sensitivity with considering the interaction effects of these parameters are performed by finite-element analysis (FEA). The electromagnetic characteristics in the low-speed range, including average torque, torque ripple, cogging torque, power density, power factor, efficiency, etc. and the flux-weakening capability in the high-speed range are investigated in detail. Based on the parametric study, the V-shaped magnet IPMSM is optimized. The results show that the performance of the optimal design is significantly improved. In addition, the validity of the FEA simulation results is verified by experiment with a prototype.
Introduction
With the increased concerns on the energy shortage and environment pollution, traditional vehicles equipped with internal combustion engine (ICE) are facing serious challenges due to their pollutant emissions. By contrast, electric vehicles (EVs) have been widely regarded as one of the most promising solutions to solve the problems associated with ICE vehicles [1]. In EVs, motors are the unique source for propulsion. The motors for EVs require both good torque characteristics in the low-speed range and good flux-weakening capability in the high-speed range [2], [3]. In the last few decades, many different kinds of motors have been developed for EV applications [4]–[13]. Due to the low reliability caused by mechanical commutators and brushes, DC motors have been replaced by AC motors [5]. In AC motors, induction machines are used in this application due to the advantages of high reliability and low cost. However, this type of motor consists of a number of drawbacks, such as low efficiency, low power factor, and low inverter-usage factor, especially in the high-speed range [6]. Permanent magnet (PM) brushless motors are more capable than induction machines, and they have been adopted by many famous automakers due to the merits of high efficiency, high power factor, high power density, etc. [7], [8]. There are various configurations of PM brushless motors. For instance, PM retention is needed in surface-mounted PM motors in the high-speed range and this limits their applications.