Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1990-01-16
1991-12-03
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 40MM, 310239, H02K 1920, H02K 1300
Patent
active
050702696
ABSTRACT:
A miniature motor having a frequency generator comprising a miniature motor consisting of a stator equipped with a permanent magnet for forming a magnetic field, and a rotor having windings wound on a rotor core, constructed so as to feed electric current to the rotor windings through a commutator which makes sliding contact with current-feeding brushes held by a brush holder fixedly fitted to a small motor case. A frequency generator is provided consisting of a rotor for detecting revolution, a stator disposed in such a manner as to face the rotor, a permanent magnet for forming a magnetic field between the rotor and the stator, and a frequency-detecting coil generating an induced voltage proportional to the revolution of the rotor. The frequency generator is incorporated in the miniature motor, in which the stator of the frequency generator has a cylindrical portion which comes in contact with the inner circumferential surface of the motor housing and a plurality of stator engaging portions, on the open-end edge of the cylindrical portion, for engaging with the open-end edge of the motor housing. The frequency generator stator is fitted to the motor housing in a state where the frequency generator stator cylindrical portion is press-fitted to the motor housing and the stator engaging portions are fitted to the open-end edge of the motor housing, and the brush holder on the small case is provided on the inner circumferential surface of the stator.
REFERENCES:
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patent: 4049984 (1977-09-01), Ishii et al.
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patent: 4529900 (1985-07-01), Uzuka
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patent: 4884000 (1989-11-01), Muller
Sata Nobuyuki
Tamaki Jun
LaBalle C.
Mabuchi Motor Co. Ltd.
Stephan Steven L.
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