Low noise miniature electric motor

Details Low noise miniature electric motor Low noise miniature electric motor

1992-04-28

1993-11-16

Ro, Bentsu

Electricity: motive power systems

Reciprocating or oscillating motor

Energizing winding circuit control

318254, 318463, H02K 2914

Patent

active

052627039

ABSTRACT:
A low noise brushless dc motor has a rotor with a permanent magnet and a stator with a bearing system mounting a shaft for rotating the rotor. The motor has an operating circuit that includes a tachometer winding connected to the base of a first transistor whose collector is in series with a first resistor. The other end of the tachometer winding is connected to the base of a second transistor whose collector is in series with a second resistor.

REFERENCES:
patent: 3373328 (1968-03-01), Hobo
patent: 3891905 (1975-06-01), Muller
patent: 4011475 (1977-03-01), Schmider
patent: 4028598 (1977-06-01), Bergmans
patent: 4065706 (1977-12-01), Gosling et al.
patent: 4374347 (1983-02-01), Muller
patent: 4667137 (1987-05-01), Macleod

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