Motor having thermostatically controlled or limited space heater

Details Motor having thermostatically controlled or limited space heater Motor having thermostatically controlled or limited space heater

1994-07-27

1997-05-20

Dougherty, Thomas M.

Electrical generator or motor structure

Dynamoelectric

Rotary

H02K 1100

Patent

active

056315090

ABSTRACT:
An apparatus adapted to be connected to a power source, the apparatus for driving a rotatable component. A motor has a stationary assembly and a rotatable assembly in magnetic coupling relation to the stationary assembly, the rotatable assembly in driving relation to the rotatable component, the stationary assembly including windings adapted to be energized by the power source to produce an electromagnetic field for rotating the rotatable assembly, the windings having a maximum desired operating temperature and a predetermined minimum desired temperature rise. A heater is in heat exchange relationship to an outer surface of the windings, the heater adapted to be connected to the power source at least when the motor windings are not energized to generate heat transferred to the windings to increase the temperature of the windings. An optional thermostat may be connected in series between the heater and the power source. The thermostat limits a maximum temperature of the heater so that the generated heat is generally insufficient to cause overheating of the heater and the heat generated inhibits condensation on the windings during periods when the motor windings are not energized. The heater has a surface area and a power density such that the heat generated by the heater generally does not raise the temperature of the heater above a maximum temperature during periods when the motor windings are not energized and substantially all residual heat has dissipated from the motor. Methods of manufacture of such motors are also disclosed.

REFERENCES:
patent: 1029230 (1912-06-01), Russell
patent: 2024385 (1935-12-01), Persons
patent: 3878362 (1975-04-01), Stinger
patent: 4661734 (1987-04-01), Capuano et al.
patent: 4797536 (1989-01-01), Handley
patent: 5061835 (1991-10-01), Iguchi
patent: 5103078 (1992-04-01), Boykin et al.
patent: 5131455 (1992-07-01), Tsuchiyama et al.
patent: 5161606 (1992-11-01), Berkeley et al.
patent: 5413164 (1995-05-01), Teshima et al.

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