Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1978-05-30
1980-10-07
Rubinson, Gene Z.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318810, 318812, 318327, H02P 540
Patent
active
042271371
ABSTRACT:
The rotor speed of a three phase induction motor is detected by a two channel pulse tachometer, which generates per revolution of the rotor 384 signals that are summed with a slip rate command signal in the first of two successive digital counters. The counters divide the 384 signals/revolutions by 192, thereby producing a four bit counter output which cycles twice per revolution of the rotor. The four bit output is decoded by a read-only memory which produces six output signals each half revolution of the rotor. The read-only output signals are applied to an inverter circuit which controls the gating of the SCR's in the lines of the stator winding of the motor. Gating circuits associated with the counters prevent undesirable simultaneous triggering of count up and down terminals, respectively, on the counters. Also balanced choke coils are employed in two of the stator winding leads between the inverter and the rectifier which supplies DC current to the inverter-controlled SCR's.
REFERENCES:
patent: 3477002 (1969-11-01), Campbell
patent: 3644721 (1972-02-01), Preiser
patent: 3731169 (1973-05-01), Burgholte et al.
patent: 3887853 (1975-06-01), Klein et al.
patent: 4039914 (1977-08-01), Steigerwald et al.
Hartman Metal Fabricators, Inc.
Rubinson Gene Z.
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