Brushless DC motor

Details Brushless DC motor Brushless DC motor

1987-05-28

1989-06-13

Salce, Patrick R.

Electrical generator or motor structure

Dynamoelectric

Rotary

310216, 310256, H02K 2900, H02K 304

Patent

active

048395528

ABSTRACT:
A brushless DC motor in which a rotary axis is rotatably mounted in a bearing portion of a stator housing, a rotor yoke is fixedly mounted on an end portion of said rotary axis, a magnet member is mounted on the face of said rotor yoke, a return yoke of ring shape is mounted to one face of said stator housing, a plurality of circumferentially extending cavity portions are formed in said return yoke spaced apart from each other in the radial direction relative to the rotary axis, and a driving coil is positioned facing said rotor yoke.
Therefore, core loss caused in said return yoke is reduced by said cavity portions of said return yoke, whereby it is able to obtain high stability at high speed rotation.

REFERENCES:
patent: 1136942 (1915-04-01), Cutten
patent: 4455516 (1984-06-01), Furusho
patent: 4547713 (1985-10-01), Langley et al.
patent: 4698539 (1987-10-01), Workman
patent: 4712034 (1987-12-01), Iwasaki

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