Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1985-11-20
1987-03-24
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Primary circuit control
318732, 318731, H02P 128, H02P 130
Patent
active
046528075
ABSTRACT:
An induction motor starting method comprises the steps of supplying a predetermined low-frequency current to the primary winding of an induction motor through a first cycloconverter having its input side connected to a commercial-frequency power source and its output side connected to the primary winding, supplying a voltage of a frequency from zero up to a first frequency through a second cycloconverter having its first input side connected to the commercial-frequency power source and its output side connected to the secondary winding, controlling the first cycloconverter to increase the frequency of the low frequency voltage supplied to the primary winding to the first frequency when the rotation speed of the induction motor reaches substantially a first rotation speed, and disconnecting the output side of the first cycloconverter with the primary winding to connect the output side of the first cycloconverter to the second input side of the second cycloconverter and connect the primary winding to the commercial-frequency power source when the rotation speed of the motor reaches substantially a second rotation speed.
REFERENCES:
patent: 4039909 (1977-08-01), Baker
patent: 4132931 (1979-01-01), Okuyama et al.
patent: 4277733 (1981-07-01), Munson
Hitachi , Ltd.
Smith Jr. David
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