Speed changing device for electric fans

Details Speed changing device for electric fans Speed changing device for electric fans

1987-11-25

1989-06-20

Wong, Peter S.

Electrical generator or motor structure

Dynamoelectric

Rotary

310189, 318777, 318817, H02K 1708

Patent

active

048411884

ABSTRACT:
A speed-changing device for electric ceiling fans includes a run coil for electrical connection to a motor of a ceiling fan, and a starting and speed changing coil, together with a starting capacitor, parallel-connected to the coil. The starting and speed-changing coil includes a set of medium-speed taps and a set of low-speed taps, forming three speed-changing coils, in which speed-changing connections can be switched without producing any noise from the motor, by maintaining the same current direction after switching.

REFERENCES:
patent: 2310874 (1943-02-01), Schiff
patent: 4486699 (1984-12-01), Hoemann et al.

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