Control device for heating deep-sea electric motor oil

Details Control device for heating deep-sea electric motor oil Control device for heating deep-sea electric motor oil

1988-03-22

1989-02-28

Smith, Jr., David

Electricity: motive power systems

Nonrunning, energized motor

318798, 417366, H02P 740

Patent

active

048088960

ABSTRACT:
A control device monitors the elapsed off time of an oil filled deep sea electric motor 4, and compares this with a calculated time for the oil temperature to drop to a predetermined value at a sensed water depth. When the two times are equal a low, heating current is supplied to the primary winding 11 to prevent the oil from becoming more viscous. The heating current is insufficient to rotate the motor armature, and its intensity is increased with depth corresponding to the decrease of the water temperature with depth.

REFERENCES:
patent: 3704078 (1972-11-01), Conery et al.
patent: 4195324 (1980-03-01), Waltz
patent: 4638643 (1987-01-01), Sakazume et al.

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