H-Switch start-up control and frequency converter for variable s

Details H-Switch start-up control and frequency converter for variable s H-Switch start-up control and frequency converter for variable s

1982-07-29

1984-07-10

Rubinson, G. Z.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318807, 363149, H02P 534, H02M 502

Patent

active

044595352

ABSTRACT:
A simple combinational technique is disclosed using one or more H-switches for start-up control and frequency conversion in an AC motor. A coordinating logic system provides H-switch toggling timing patterns yielding phase shifted voltage waveforms in the motor windings to afford a rotating field during start-up, and provides irregular switching times yielding a chopped sinusoid output waveform of converted frequency for variable speed operation.

REFERENCES:
patent: 4117364 (1978-09-01), Baker
Andrews, Dallas R., "Diode Used for Motor Starting," RCA Technical Notes; 705; Jan. 1967.
"Power Transistor Applications for Switching Regulators & Motor Control", Marvin Smith, General Elec. Co., Semiconductors Prod. Dept., Auburn, N.Y., Oct. 1979, pp. 22-23.
"Static Power Frequency Changers", Guygui and Pelly, John Wiley & Sons, N.Y., 1976.

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