Abstract：In this paper, a doubly salient permanent magnet (DSPM) machine with novel full-pitch windings is proposed. The operating principle is analyzed and the finite element method is used to calculate the flux distributions of 4/6-pole fully pitched DSPM machine. The static characteristics such as flux linkage, back EMF, inductance, and static torque show that the full pitched DSPM machine has bipolar flux variation, and the output power is equal to the previous DSPM machine with concentrated windings, with decreased copper consumption and higher efficiency. Moreover, two ways to improve the output capability of the DSPM machine are proposed. An improved three-phase 24/10-pole fully pitched DSPM machine was manufactured, analyzed and tested, and the result not only verifies the correctness of the theoretical analysis, but also reveals in the first time that the flux switching permanent magnet (FSPM) machine is a full pitched DSPM machine in nature and the higher power density of the FSPM machine is due to its increased airgap flux density by using more permanent magnet, instead of the bipolar flux variation. It also shows that the improved full-pitch winding DSPM machine has higher power output capability than the concentrated winding DSPM machine.
[1] Liao Y, Liang F, Lipo T A. A novel permanent magnet motor with doubly salient structure[J]. IEEE Transactions on Industry Applications, 1995, 31(5): 1069-1077. [2] Sarlioglu B, Zhao Y, Lipo T A. A novel doubly salient single phase permanent magnet generator[C]. IEEE IAS Annual Meeting, 1994: 9-15. [3] 边敦新, 詹琼华, 哈里布. 法迪, 等. 一种新型双凸极单相永磁电动机的工作原理与参数计算[J]. 中国电机工程学报, 2000, 20(10)：14-18. [4] 程明, 周鹗, 蒋全. 双凸极变速永磁电机的静态特性[J]. 电工技术学报, 1999, 14(5)：9-13. [5] 孙强, 程明, 周鹗, 等. 双凸极永磁电机转矩脉动分析[J]. 电工技术学报, 2002, 17(5)：10-15. [6] Cheng M, Sun Q, Zhou E. New self-tuning fuzzy PI control of a novel doubly salient permanent magnet motor drive[J]. IEEE Transactions on Industrial Electronics, 2006, 53(3): 814-821. [7] Hong E, Ben Ahmed A H, Lucidame J. Switching flux permanent magnet polyphased synchronous machine[C]. Proc. of the 7th Eur. Conf. on Power Electronics and Applica- tions, 1997, 3: 903-908. [8] Zhu Z Q, Pang Y, Howe D, et al. Analysis of electromagnetic performance of flux-switching permanent-magnet machines by nonlinear adaptive lumped parameter magnetic circuit model [J]. IEEE Transactions on Magnetics, 2005, 41(11): 4277-4287. [9] Hua Wei, Cheng Ming, Zhu Z Q, et al. Study on static character- istics of a novel two-phase flux-switching doubly-salient permanent magnet machine[J]. Transactions of China Electrotechnical Society, 2006, 21(6): 70-77. [10] Deodhar R P, Andersson S, Boldea I, et al. The flux-reversal machine: a new brushless doubly-salient permanent-magnet machine[J]. IEEE Transactions Industry Application, 1997, 33(4): 925-934. [11] Wang C, Nasar S A, Boldea I. Three-phase flux reversal machine[J]. IEE Proceedings-Electric Power Application, 1999, 146(2): 139-146. [12] Pollock C, Wallace M. The flux switching motor, a DC motor without magnets or brushes[C]. Conf. Rec. IEEE IAS Annual Meeting, 1999, 3: 1980-1987.
2009, Vol. 24 
