Brushless motor

Details Brushless motor Brushless motor

1979-07-12

1985-07-16

Wong, Peter S.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 67, 310266, 310156, H02K 104

Patent

active

045299005

ABSTRACT:
A brushless motor comprising a rotor assembly including a rotor magnet which is formed substantially as a hollow cylinder. In one embodiment, the rotor magnet is molded of synthetic resin and contains magnetic material. A rotor shaft is mechanically coupled to the rotor magnet. A stator assembly includes electromagnetic windings wound upon a core. The core has magnetic poles which are spaced from a surface of the cylindrical wall of the rotor magnet by an air gap. In one example, the rotor magnet is cup-shaped having an end wall which bridges the cylindrical wall so as to have the rotor shaft secured to such end wall. The stator assembly also may include a yoke member formed of magnetically permeable material and spaced from the opposite surface of the cylindrical wall of the rotor magnet, whereby the cylindrical wall of the rotor magnet rotates between the magnetic poles of the stator assembly and the yoke member.

REFERENCES:
patent: 3231770 (1966-01-01), Hyde
patent: 4074157 (1970-02-01), Lace
patent: 4082970 (1978-04-01), Girardin
patent: 4099077 (1978-07-01), Maekawa
patent: 4115715 (1978-09-01), Muller
patent: 4143288 (1979-03-01), Sato
patent: 4185215 (1980-01-01), Montagu

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