Electricity: motive power systems – Generator-fed motor systems having generator control – Control of both the generator and the motor
Patent
1975-11-17
1977-12-06
Schaefer, Robert K.
Electricity: motive power systems
Generator-fed motor systems having generator control
Control of both the generator and the motor
318151, 318341, 318471, 318473, H02P 526
Patent
active
040619494
ABSTRACT:
An earth excavator including apparatus for stabilizing performance by compensating for changes in temperature. The apparatus includes a temperature compensating voltage regulator for regulating and controlling the output voltage of an exciting generator as a function of sensed temperature. The exciting generator supplies field excitation voltage and current to electric motors in the earth excavator. In order to maintain substantially constant current through the motor field windings with variations in temperature of the windings, and therefore to maintain the performance of the motors and thus of the excavator substantially constant with variations in temperature, the exciting generator output voltage is regulated in a manner such that the regulated voltage supplied by the exciting generator is a direct function of the temperature of the motor field windings. The output voltage of the exciting generator is controlled by controlling the average current through the exciting generator field winding. In order to produce a signal representative of motor field winding temperature, the temperature of a representative motor field winding, or of the exciting generator field winding, or of an element having a temperature which is representative of motor field winding temperature is sensed.
REFERENCES:
patent: 2659852 (1953-11-01), Trevitt
patent: 2776397 (1957-01-01), McWilliams
patent: 3378753 (1968-04-01), Poppinger et al.
patent: 3381199 (1968-04-01), Persson
patent: 3396323 (1968-08-01), Auld
patent: 3590365 (1971-06-01), Nelson
patent: 3783360 (1974-01-01), Bundy
patent: 3896359 (1975-07-01), Olander et al.
General Electric Company
Indyk Eugene S.
Myles Vale P.
Schaefer Robert K.
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