Control system of pumping operation using AC exciting generator-

Details Control system of pumping operation using AC exciting generator- Control system of pumping operation using AC exciting generator-

1988-10-21

1989-08-15

Croyle, Carlton R.

Pumps

Condition responsive control of pump drive motor

Single motor control element responsive to means sensing...

417 38, 318798, F04B 4902

Patent

active

048569658

ABSTRACT:
A control system of pumping operation comprises a cycloconverter for converting AC power from a AC power system into AC power having a given frequency, anAC exciting generator-motor, having a stator side electrically connected to the AC power system, having a rotor side electrically connected to the cycloconverter, and having a rotor shaft mechanically coupled to a pump-turbine by which the pumping operation is carried out, a circuit breaker inserted between the AC power system and the AC exciting generator-motor, a rotation speed controller for controlling a rotation speed of the AC exciting generator-motor such that the rotation speed becomes slow when the pumping operation is to be stopped, an AC excitation controller for decreasing a degree of excitation effected by the cycloconverter, wherein decreasing of the excitation degree starts when the rotation speed of the AC exciting generator-motor reaches a given minimum value, and a circuit breaker controller for turning off the circuit breaker when input power, supplied from the AC power system to the AC exciting generator-motor becomes substantially zero.

REFERENCES:
patent: 4382745 (1983-05-01), Kuwabara et al.
patent: 4625125 (1986-11-01), Kuwabara
patent: 4641040 (1987-02-01), Megnint
patent: 4743827 (1988-05-01), Shiozaki et al.
patent: 4754156 (1988-06-01), Shiozaki et al.
Patent Abstracts of Japan--vol. 9, No. 73 (M--368) 6/1796, Apr. 3, 1985, & JP-A-59 203883 (Hitachi Seisakusho K.K.).

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