指導老師：王明賢 老師 學 生：黃品翰 日 期：2015/1/15 Torque Ripple Minimization in Direct Torque Control of Brushless DC Motor Zhenguo Li†, Songfa Zhang*, Shenghai Zhou** and Jin-Woo Ahn*** J Electr Eng Technol Vol. 9, No. 5: 1569-1576, 2014 ㄈ KER RING 西崑SER S 指導老師：王明賢 老師 學 生：黃品翰 日 期：2015/1/15

Outline Abstract Introduction Direct Torque Control System of BLDCM Simulation and Experiments Conclusion References

ABSTRACT Recently, interior permanent magnet synchronous motors (Interior- PMSMs) have become known as a good candidate for hybrid electric vehicle (HEV) traction drive application due to their unique merits. However, the dynamic and steady-state behaviors of these motors are quite dependent on the permanent magnet (PM) type, conguration, and volume in rotor structures. This paper uses a novel structure of Interior-PMSMs for traction applications with fragmental buried rotor magnets in order to achieve low torque ripple, iron losses, and cogging torque. In this paper, rst, the eect of the PM type on a d-q equivalent circuit model is examined. Next, the design and simulation of an Interior-PMSM for HEV traction drive application, in order to extract the output values of the motor and sensitivity analysis of the PM type, are done using a 3-dimensional nite element method model. We then present the back electromotive force,power factor, cogging torque, ux density, torque per ampere diagram, PM volume, and constant power speed ratio value behavior of the designed Interior-PMSM with dierent PMs in the rotor structure, and we discuss the eect of temperature variation on these output parameters. This study can help designers in the design approach of such motors. 本文主要在BLDCM提出一個直接轉矩控制使轉矩漣波最小化，由於BLDCM的低電感，當一個電壓向量用於一個周期時 擁有大電流和大轉矩漣波