DocumentCode :
2473916
Title :
Study of anti-demagnetization property for a flux-shunt permanent magnet DC motor
Author :
Yang, Yee-Pien ; Wu, Cheng-Ju
Author_Institution :
Dept. of Mech. Eng., Nat. Taiwan Univ., Taipei, Taiwan
fYear :
2010
fDate :
14-17 March 2010
Firstpage :
422
Lastpage :
426
Abstract :
Rare earth magnets of high-energy products have been widely used to improve the efficiency, as well as the power and torque per unit weight, of permanent magnet machines. In addition to limited resources and high prices, the rare earth magnet may risk irreversible demagnetization during field weakening or malfunctioning in machine operation. To solve this problem, this research investigates the anti-demagnetization property due to the flux shunt mechanism and hybrid magnetomotive force in a permanent magnet direct-current motor. The hybrid magnetomotive force is provided by low-grade permanent magnets and additional field windings, between which are ferromagnetic media that shunt the adjustable magnetic flux in the machine. An optimal machine design is performed and verified with a finite element analysis. A prototype is fabricated, and the experimental results show that machine efficiency and torque are increased by increasing the current of field winding and that machine speed can be extended by reducing the field current. Finally, the anti-demagnetization mechanism is proved effective by investigating the reduction of back electromagnetic force after demagnetization.
Keywords :
DC motors; demagnetisation; electric potential; finite element analysis; permanent magnet motors; adjustable magnetic flux; anti-demagnetization property; back electromagnetic force reduction; ferromagnetic media; field malfunctioning; field weakening; field windings; finite element analysis; flux-shunt permanent magnet dc motor; hybrid magnetomotive force; machine speed; optimal machine design; permanent magnet machines; rare earth magnets; risk irreversible demagnetization; DC motors; Demagnetization; Machine windings; Magnetic flux; Magnetic properties; Mechanical factors; Permanent magnet machines; Permanent magnet motors; Permanent magnets; Torque; Permanent magnet machine; demagnetization; flux shunt; hybrid magnetomotive force;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Industrial Technology (ICIT), 2010 IEEE International Conference on
Conference_Location :
Vi a del Mar
Print_ISBN :
978-1-4244-5695-6
Electronic_ISBN :
978-1-4244-5696-3
Type :
conf
DOI :
10.1109/ICIT.2010.5472763
Filename :
5472763
Link To Document :
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