Brushless DC motor

Details Brushless DC motor Brushless DC motor

1989-06-12

1990-11-20

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310154, 310156, 310180, H02K 117, H02K 2104, H02K 2112, H02K 2126

Patent

active

049721127

ABSTRACT:
A brushless DC motor includes a rotor assembly and a stator assembly. The rotor assembly includes a plurality of rotor permanent magnets of a first polarity. The stator assembly includes a plurality of stator magnetic field assemblies facing the rotor assembly. Each stator magnetic field assembly includes a box-like magnetic core having an opening facing the rotor assembly. A permanent magnetic core is disposed within the box-like magnetic core having a surface facing the rotor assembly and possessing a second polarity at this surface. A field coil is wound in proximity to the box-like magnetic core for energizing the stator magnetic field assembly. A boosting permanent magnet is provided along an outer surface of the box-like magnetic core.

REFERENCES:
patent: 3201625 (1965-08-01), Smith et al.
patent: 3670189 (1972-06-01), Monroe
patent: 3862445 (1975-01-01), Volkrodt
patent: 3999107 (1976-12-01), Reuting
patent: 4007387 (1977-02-01), Rustecki
patent: 4011479 (1977-03-01), Volkrodt
patent: 4712028 (1987-12-01), Horber
patent: 4763034 (1988-08-01), Gamble

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