D.C. brushless motor with an improved yoke

Details D.C. brushless motor with an improved yoke D.C. brushless motor with an improved yoke

1984-10-09

1986-05-13

Skudy, R.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 43, 310 71, 310 89, H02K 1100

Patent

active

045889120

ABSTRACT:
In a D.C. brushless motor, a drive coil (11), a drive circuit (40), and an magnetoelectric transducer (19) are mounted on an insulating base plate (7) which is received in a generally cup-shaped yoke (12). The drive coil, drive circuit and transducer are all mounted on a first side of the base plate (7) while terminals (7b) of the drive circuit protrude from the first side. As a result, the base plate (7) is placed on a bottom of the yoke (12) which bottom substantially faces an entire area of a rotor (5) of the motor thereby reluctance of a magnetic circuit formed by said yoke (12) is substantially constant during one revolution of the rotor (5). The base plate may (7) be directly in contact with the yoke (12) so as to facilitate heat dissipation, while the drive circuit (40) and the transducer (19) are hermetically sealed by a synthetic resin (7d). In some embodiments, a recess (12c) is formed in addition to a center recess (12g) of the yoke (12) so that the rotor (5) is accurately positioned at a desired initial setting position on deenergization of the drive coil (11) and quick start of the rotor (5) is accomplished.

REFERENCES:
patent: 3180267 (1965-04-01), Bemmann
patent: 3845339 (1974-10-01), Merkle
patent: 4115713 (1978-09-01), da Costa
patent: 4181867 (1980-01-01), Muller
patent: 4242608 (1980-12-01), Ishigaki
patent: 4429240 (1984-01-01), Kishi

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