Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1992-01-07
1994-06-28
Shoop, Jr., William M.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318749, 318795, 361 23, H02H 504
Patent
active
053250346
ABSTRACT:
An emergency power circuit powers an induction motor which has at least first and second windings. The motor is normally operating at a normal speed determined by connection to commercial frequency power line, but which is subject to failure. During failure the emergency power circuit is used to supply emergency power from a DC storage battery. An inverter is supplied by the battery and has an output connectable to the motor. A control circuit for the inverter establishes a first frequency to run the motor at a running speed which is considerably less than the normal speed. Single, two-phase and three-phase systems are disclosed as well as a soft start system to start the motor at about one-fourth speed and run it at one-half speed. Preferably a high frequency oscillator is used with the frequency divided dozen to operate the motor at a speed below normal 60 Hz energization speed. The foregoing Abstract is merely a resume of general applications, it is not a complete discussion of all principles of operation or applications, and is not to be construed limitation on the scope of the claimed subject matter.
REFERENCES:
patent: 4258368 (1981-03-01), Arnold et al.
patent: 4722019 (1988-01-01), Pohl
patent: 4794309 (1988-12-01), Saito et al.
patent: 4843295 (1989-06-01), Thompson et al.
patent: 4853569 (1989-08-01), Lewus
Reynolds, deceased William R.
Reynolds, executor by Renata C.
Cabeca John W.
Shoop Jr. William M.
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