Brushless dc motor and rotor magnet

Details Brushless dc motor and rotor magnet Brushless dc motor and rotor magnet

1990-04-03

1991-07-09

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 67R, 310186, H02K 2122, H02K 2908

Patent

active

050308688

ABSTRACT:
A brushless dc motor comprising a stator, and a rotor incorporating a hollow cylindrical permanent magnet. The rotor magnet has sectors magnetized radially in opposite directions to define poles of opposite polarity extending around the circumference of the magnet. The magnet is completely magnetized so as to leave no non-magnetized sectors between the poles of the magnet. The magnet has grooves in its surface facing the stator, the grooves extending in the longitudinal direction of the magnet. Each groove is offset from, or non-symmetrical with respect to, the center of the rotor pole in which it is located.

REFERENCES:
patent: 3500090 (1970-03-01), Baermann
patent: 4031419 (1977-06-01), Spiesberger et al.
patent: 4549104 (1985-10-01), Nimura et al.
patent: 4562399 (1985-12-01), Fisher
patent: 4788464 (1988-11-01), Nishikawa et al.
patent: 4893040 (1990-01-01), Turner et al.

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