Brushless DC motor with rare-earth magnet rotor and segmented st

Details Brushless DC motor with rare-earth magnet rotor and segmented st Brushless DC motor with rare-earth magnet rotor and segmented st

1979-08-27

1981-06-30

Budd, Mark O.

Electrical generator or motor structure

Dynamoelectric

Rotary

310156, 310218, 310254, H02K 1926, H02K 118

Patent

active

042764904

ABSTRACT:
A brushless DC motor is provided comprised of a steel ring rotor on which rare-earth magnets are fastened and a segmented stator having a comb-like core for each segment that extends at each end beyond its support structure so phase windings in slots in those extended ends can be provided to the same extent as for all other slots in the comb-like segment, thereby producing substantially the same torque on the rotor over the extended ends as over the central portion of the stator segment. Due to their high coercivity, the rare-earth magnets can operate into air circuits between stator segments without demagnetization, returning to their high flux levels upon re-entering a stator segment.

REFERENCES:
patent: 2993134 (1961-07-01), Harvey
patent: 3072813 (1963-01-01), Reijnst et al.
patent: 3237034 (1966-02-01), Krasnow
patent: 3344325 (1967-09-01), Sklaroff
patent: 3452229 (1969-06-01), Pimlott et al.
patent: 3454857 (1969-07-01), Farrand et al.
patent: 3586942 (1971-06-01), McMahan
patent: 3859549 (1975-01-01), Boesel

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