Varistor in an electric motor

Details Varistor in an electric motor Varistor in an electric motor

1989-11-14

1992-03-10

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310220, 310 64, 310 51, H02K 1100, H02K 928, H01R 3946

Patent

active

050952390

ABSTRACT:
In a fractional horsepower PMDC motor a varistor comprises an annular ring of varistor material having a heat sink bonded to one face. The heat sink includes a plurality of fan blades and is attached to a commutator of the motor. The heat sink increases the thermal capacity of the varistor to resist overheating under stall conditions and improves heat dissipation when the motor is running.

REFERENCES:
patent: 2470096 (1949-05-01), Eck
patent: 3487248 (1969-12-01), Kaneko et al.
patent: 3488538 (1970-01-01), Hayashi
patent: 3745505 (1973-07-01), Turnbull et al.
patent: 4734607 (1988-03-01), Ikawa et al.
patent: 4833357 (1989-05-01), Tamura et al.
patent: 4859893 (1989-08-01), Wang

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