Imprinted geometric magnetic anticog permanent magnet motor

Details Imprinted geometric magnetic anticog permanent magnet motor Imprinted geometric magnetic anticog permanent magnet motor

1995-06-26

1998-07-21

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310152, 310154, 310254, 310261, H02K 2342

Patent

active

057838909

ABSTRACT:
A brushless, direct current, permanent magnet motor is disclosed, which comprises a stator and a rotor mounted for rotation about an axis in the stator. The stator has a plurality of stator teeth separated by axial interpolar teeth slots. Two pairs of ferrite ceramic magnets, formed as arc segments of equal circumferential length and axially constant radial thickness, are mounted on the rotor. Leading and trailing margins of each magnet are magnetized with a longitudinally varying magnetization strength or gradient while the central portion of each magnet is uniformly magnetized. This process produces axially alternating areas of low and high magnetization, which simultaneously cross each interpolar teeth slot upon rotor rotation to minimize cogging. An air gap of axially uniform width and the constant magnet thickness provides a constant reluctance path radially through the air gap and margins of the magnets.

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patent: 5319844 (1994-06-01), Huang et al.

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