Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1997-03-06
1998-07-14
Wysocki, Jonathan
Electricity: motive power systems
Induction motor systems
Primary circuit control
318729, 318438, H02P 700
Patent
active
057809909
ABSTRACT:
Alternating current electric induction motor operating from a source of AC electric power is driven at a parasynchronous rate of field collapse and magnetic flux reversal which is derived from the immediate train of alternating half-wave power cycles supplied by the AC power source. The higher and lower rates of magnetic flux field reversal result in a corresponding higher or lower rate of magnetic flux field rotation than that which is ordinarily produced. In a subsynchronous operating mode, bicyclic half-cycles of AC power are polarity-paired through inversion of one of the component half-cycles and successive pairs are alternated in polarity, thereby parasynchronously decreasing the effective rotating magnetic flux field rate. In a suprasynchronous mode, individual AC power half-cycles are split into quarter-cycle quadrants and the quadrants are successively alternated in polarity, thereby parasynchronously increasing the effective rotating magnetic flux field rate. A novel induction motor construction having two parallel RUN windings, with each winding sequentially excited in opposite directions by the parasynchronous power pulses simplifies intercycle switching circuitry. Shaft speed of a common 2-pole AC motor which ordinarily runs just shy of 3,600 RPM from 60 Hertz AC power now runs pseudosynchronously runs shy of 1,800 RPM in the subsynchronous mode and near 7,200 RPM in the suprasynchronous mode.
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