永磁無刷馬達利用電子電路方式取代傳統有刷馬達的換相動作，具有高效率、可控制性佳以及維修方便等優點，其依照磁鐵配置可分為內藏型(Interior Permanent Magnet, IPM) 與表面型(Surface-mounted Permanent Magnet, SPM)兩種。內藏型具有較佳結構強度等優勢，因此適用於較大型馬達如壓縮機馬達。然而大型馬達由於磁鐵強度大，有組裝不易及製造成本高等缺點，故研
發新的充磁技術有其必要。「後充磁法」(Post-Assembly Magnetization)是一種新的充磁技術，其作法為馬達組裝完成後，再利用本身定子線圈透過外部的充磁電路，將轉子內部的磁鐵充磁，如此可改善上述缺點，然而此作法有許多技術上亟需克服之處。
　　本文主要在於將後充磁技術應用於內藏式永磁無刷馬達。由於內藏式磁鐵的馬達磁鐵本身距離線圈較遠，故充磁時候之磁場分析也較為困難。本文研究內容概分為分析、模擬與實驗驗證三個部分。在分析方面利用靜磁場數值解析後充磁專用馬達的磁路、磁通密度以及電感值，再透過等效磁路法做修正計算，並進一步分析充磁瞬
間電流與電壓之關係，以獲得理想的馬達特性。在模擬方面，藉由有限元素軟體建立其定子線圈電流通過時的模型，依據充磁時的磁場強度與磁通密度來推算磁鐵在各位置的飽和程度，並模擬磁通於轉子之分布圖形，以驗證充磁時轉子角度之計算結果。最後將實際的馬達量測數據與模擬數據做比較與分析，得到充磁時定子線圈
繞組所需的最小充磁電流，並提供了一個預估不同定子繞組情況下，所可能產生的反電動勢波形方法。實驗結果電感值估算部分與實驗值接近，而充磁電流之預估方面亦得出其定性關係，可提供未來設計製作後充磁永磁馬達之參考。

　　In comparison with brush commutation motors,permanent-magnet (PM)brushless motors possess advantages such as higher efficiency, easier to control and less maintenance requirement.According to the magnet layout in rotors, PM brushless motors can be categorized into two types, one being the surface-mounted permanent magnet (SPM) and the other the interior permanent magnet (IPM) motors. The IPM motors are structurally stronger than the SPM motors and are more suitable for large-scale motors such as electric vehicles or compressor. However, the large flux intensity required may cause problems in the process of handling and assembling the magnets and hence increase manufacturing cost.Post-assembly magnetization (PAM) is a new
magnetization technique, which fabricates the motors before the magnet is magnetized by applying impulse on the motor stator windings.
　　This paper focuses on the PAM technique applied to IPM motors. The distance between magnets and winding coils appears significant for IPM motors, and hence the magnetization with the PAM and its magnetic field distribution are expected to be more difficult to analyze.This study contains three parts, and there are analysis, simulation and experiment. In the analysis, the static magnetic field analytical method is employed to analyze the magnetic circuit, flux density and inductances,which are then modified using the equivalent magnetic circuit model. In the simulation, the stator winding applied with electric impulses for magnetization is modeled with finite element analysis to obtain the required magnetization level and the distribution of flux. Finally, this study compares the measurement data with the simulation results. The overall results can be provided as good references for further motor design using post-assembly magnetization.

[1] Ansoft Corporation, Maxwell 2D field simulator user reference, 2000.

[2] Ansoft Corporation, Simulation System SIMPLORER 6.0 User
Manual, 2002.

[3] A. Radun, Analytical Calculation of the Switched Reluctance Motor’s
Unaligned Inductance, IEEE Transactions on Magnetics, Vol. 35, No.
6, 1999.

[4] C. K. Lee and B. I. Kwon, Study in the post-assembly magnetization
method of permanent magnet motors, International Journal of Applied
Electromagnetics and Mechanics, Vol.20, 2004.

[5] C. K. Lee and B. I. Kwon, Design of Post-Assembly Magnetization
System of Line Start Permanent-Magnet Motors Using FEM, IEEE
Transactions on Magnetics,Vol. 41, No.5, 2005.

[6] D. Hanselman, Brushless Permanent Magnet Motor Design Second
Edition, The Writers’ Collective, 2003.

[7] G. W. Jewell and D. Howe, Computer-Aided Design of Magnetizing
Fixtures for the Post-Assembly Magnetization of Rare-Earth
Permanent Magnet Brushless DC motors, IEEE Transactions on
Magnetics, Vol.28, No.5, 1992.

[8] H. Zeroug, B. Boukais and H. Sahraoui, Analysis of Torque Ripple in
a BDCM, IEEE Transactions on Magnetics, Vol.38, No.2, 2002.

[9] K. J. Lee, S. Kim and J. Lee, Effect of maximum torque according to
the permanent magnet configuration of a brushless dc motor with
concentrated winding, Journal of Applied Physics, Vol.93, 2003.

[10] T. R. Eastham, Graham E. and D. L. Chang, In Situ Magnetization of
Isotropic Permanent Magnets, IEEE Transactions on Magnetics, Vol.
38, No.5, 1991.

[11] J. F. Gieras and Mitchell Wing, Permanent Magnet Motor Technology
Design and Applications Second Edition, Revised and Expanded,
MARCEL DEKKER, 2002.

[12] J. F. Gieras, Analytical Approach to Cogging Torque Calculation in
PM Brushless Motors, IEEE Transactions on Magnetics, Vol.2, 2003.

[13] Zheng P., Y. Liu, Y. Wang, Shukang and Cheng, Magnetization
Analysis of the Brushless DC Motor Used for Hybrid Electric Vehicle,
IEEE Transactions on Magnetics, Vol.41, No.1, 2005.

[14] Zheng P., Y. Liu, Y. Wang and Cheng, Post-Assembly Magnetization
of Brushless DC Motor. IEEE Transactions on Magnetics, 2004.

[15] P. Campbell, Permanent Magnet Materials and their Application,
CAMBRIDGE UNIVERSITY PRESS, 1999.

[16] S. M. Hwang, J. B. Eom, Y. H. Jung, D. W. Lee and B. S. Kang,
Various Design Techniques to Reduce Cogging Torque by Controlling
Energy Variation in Permanent Magnet Motors, IEEE Transactions on
Magnetics, Vol.37, No.4, 2001.

[17] T. J. E. Miller and J. R. Hendershot Jr., Design of Brushless
Permanent-Magnet Motors, MAGNA PHYSICS PUBLISHING and
CLARENDON PRESS OXFORD, 1994.

[18] Y. Kawase, T. Yamaguchi and Y. Hayashi, Analysis of Cogging
Torque of Permanent Magnet Motor by 3-D Finite Element Method,
IEEE Transactions on Magnetics, Vol.31, No.3, 1995.

[19] Y. Okada, H. Inoug, H. Fusayasu and H. Nishida, Analysis for
Permanent Magnet Motor Taking Account of magnetizing Process,
IEEE Transactions on Magnetics, Vol.33, No.2, 1997.

[20] 王以真，實用磁路設計，全華科技圖書，2000。

[21] 王薔、李國定、龔克，電磁場理論基礎，五南圖書，2003。

[22] 茆尚勳，直驅式跑步機用直流無刷馬達設計，成功大學碩士論文，
2002。

[23] 陳雙穩，永磁無刷馬達之繞線結構對性能影響之研究，國立成功
大學碩士論文，2001。

[24] 陳秋麟，王順忠，電機機械基本原理第三版，美商麥格羅-希爾國
際，2003。

[25] 孫清華，最新直流無刷馬達，全華科技圖書，2001。

[26] 廖福奕編譯，小型馬達技術，全華科技圖書，2003。

[27] 賴國洲，基本電學，全華科技圖書，2004。

[28] 謝旻甫、趙儒民，自主性太陽能船之推進與監控系統整合設計(I)，
國科會-能源局能源科技研究計畫報告, 2005。