Radial-direction gap type magnet motor

Details Radial-direction gap type magnet motor Radial-direction gap type magnet motor

2007-11-15

2011-10-25

Mullins, Burton (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C148S101000, C148S103000

Reexamination Certificate

active

08044547

ABSTRACT:
In a radial-direction gap type magnet motor, when an energy density increases, a direction change Mθ/φp of a static magnetic field with respect to a mechanic angle between different poles increases in an exponential manner and thus to decrease a cogging torque of the motor is not compatible to increase a torque density. In order to solve the problem, assuming that φt denotes a mechanic angle of a stator iron core teeth, φp denotes a mechanical angle of a magnetic pole, and Mθ denotes an angle of a static magnetic field with respect to a circumferential tangential line of a radial magnetic pole center, a radial-direction type magnet motor in which φt<φp, Mθ in a magnetic pole center region is 75 to 90°, and Mθ/φp≦7 is satisfied in the magnetic pole end region of φp×0.1°, and further, a static magnetic field generating source is configured as a magnetic anisotropic magnetic pole having an energy density (BH) max≧150 kJ/m3is provided.

REFERENCES:
patent: 7202585 (2007-04-01), Ohata et al.
patent: 7228616 (2007-06-01), Stephens
patent: 7453181 (2008-11-01), Kikuchi et al.
patent: 7569961 (2009-08-01), Miyashita
patent: 2009/0007417 (2009-01-01), Yamashita et al.
patent: 2002-191144 (2002-07-01), None
patent: 2002-262533 (2002-09-01), None
patent: 2006-080115 (2006-03-01), None
Fumitoshi Yamashita et al., “Jiko Soshikika Radial Jiki Ihosei Kidorui Bond Jishaku,” Matsushita Technical Journal, Feb. 2005, vol. 51, No. 1, pp. 56-60.
J. Schulze, “Application of High Performance Magnets for Small Motors,” Proc. of the 18thInternational Workshop on High Performance Magnets and Their Applications, 2004, pp. 908-915.
Y. Pang et al., “Comparison of Brushless Motors Having Halbach Magnetized Magnets and Shaped Parallel Magnetized Magnets,” Proc. of the 18thInternational Workshop on High Performance Magnets and Their Applications, 2004, pp. 400-407.
W. Rodewald et al., “Properties and Applications of High Performance Magnets,” Proc. of the 18thInternational Workshop on High Performance Magnets and Their Applications, 2004, pp. 52-63.
Atsushi Matsuoka et al., “Examination of Performance Improvement Brushless DC Fan Motors,” Rotating Equipment Seminar of Electric Association, the Institute of Electrical Engineers of Japan (IEEJ), RM-01-161, 2001, pp. 13-18.
D. Howe et al., “Application of Halbach Cylinders to Electrical Machine,” Proc. of the 16thInternational Workshop on Rare-Earth Magnets and Their Applications, 2000, pp. 903-922.
Takahiko Iriyama, “Development Trends of High-Performance Rare-Earth Bonded Magnets,” Ministry of Education, Culture, Sports, Science and Technology, Innovation Creation Project/Symposium of Efficient Usage of Rare-Earth Resource and Advanced Material, 2002, pp. 19-26.
B. H. Rabin et al., “Recent Developments in Nd-Fe-B Powder,” 120thTopical Symposium of the Magnetic Society of Japan, 2001, pp. 23-28.
M. Ma, “Recent Powder Development at Magnequench,” Polymer Bonded Magnets 2002.
S. Hirosawa et al., “Structure and Magnetic Properties of Nd2Fe14B/FexB-type Nanocomposites Prepared by Strip Casting,” 9th Joint MMM/INTERMAG, FG-05, 2004.
H. A. Davies et al., “Nanophase Pr and Nd/Pr-Based Rare Earth-Iron-Boron Alloys,” Proc. of 16thInternational Workshop on Rare-Earth Magnets and Their Applications, 2000, pp. 485-495.
R.W. Lee et al., “Processing of Neodymium-Iron-Baron Melt-Spun Ribbons to Fully Dense Magnets,” IEEE Transactions on Magnetics, Sep. 1985, vol. 21, pp. 1958-1963.
A. Kawamoto et al., “Sm2Fe17N3Magnet Powder Made by Reduction and Diffusion Method,” IEEE Transactions on Magnetics, Sep. 1999, vol. 35, No. 5, pp. 3322-3324.
T. Takeshita et al., “Magnetic Properties and Microstructures of the NdFeB Magnet Powder Produced by Hydrogen Treatment,” Proc. of the 10thInternational Workshop on Rare-Earth Magnets and Their Applications, pp. 551-557.
International Search Report issued Feb. 19, 2008 in International application No. PCT/JP2007/072174, 2 pages.

Affiliated with

Also associated with

Rating

Radial-direction gap type magnet motor does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Radial-direction gap type magnet motor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radial-direction gap type magnet motor will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4257617