Methods and apparatus for improved DC motors and magnetic clutch

Details Methods and apparatus for improved DC motors and magnetic clutch Methods and apparatus for improved DC motors and magnetic clutch

1996-09-04

1999-01-19

Ramirez, Nestor

Electrical generator or motor structure

Dynamoelectric

Rotary

29598, H02K 2112

Patent

active

058616969

ABSTRACT:
A method for manufacturing a direct current motor having a stator and a rotor. The stator has a first number of slots, and the rotor includes a permanent magnet having a second number of alternately magnetized poles. The method includes calculating a magnetization pattern based on a magnetizing construct associated with said direct current motor, which magnetizing construct includes a hypothetical magnetizing stator having the same number of magnetizing teeth as the second number of alternately magnetized poles. The method further includes having the permanent magnet magnetized with substantially the calculated magnetization pattern, thereby forming the direct current motor.

REFERENCES:
patent: 5006745 (1991-04-01), Nishio et al.
patent: 5030864 (1991-07-01), Van Hout et al.
patent: 5355043 (1994-10-01), Kaneda
patent: 5418414 (1995-05-01), Ackermann et al.
patent: 5652473 (1997-07-01), Delamare et al.
Zhu et al., "Instantaneous Magnetic Field Distribution in Brushless Permanent Magnet dc Motors, Part I: Open-Circuit Field", IEEE Transactions on Magnetics, vol. 29, No. 1, Jan. 1993.
Ackermann, et al., "New Technique for reducing cogging torque in a class of brushless DC motors", IEE Proceedings-B, vol. 139, No. 4, Jul., 1992.

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