Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1983-01-03
1984-09-25
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Primary circuit control
318806, 318811, H01P 540
Patent
active
044737904
ABSTRACT:
A variable speed a-c drive motor is controlled by a current feedback pulse width modulation scheme which effectively isolates the controlled motor current from variations in the input d-c voltage. An additional control loop is provided to superimpose a control signal on the amplitude command input circuit of the pulse width modulation control scheme. The additional loop responds to line current and particularly line current resonance between the input d-c filter and the line inductance. Instantaneous line current is then maintained at the minimum required to support instantaneous power flow to the a-c motor so that resonance current is suppressed.
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patent: 4258302 (1981-03-01), Plunkett
patent: 4320331 (1982-03-01), Plunkett
J. Zubek et al., "Pulse Width Modulated Motor Drives with Improved Modulation," 9th Annual IEEE/IAS Mtg. 1974, vol. 1A-11, No. 6, Nov./Dec. 1975, pp. 695-703.
Walden & Turnbull, "Adjustable Voltage and Frequency Polyphase Sine Wave Generator", 1974 IEEE/IAS Annual Mtg., (74 CHO 833-41A), pp. 1015-1020.
D'Atre John D.
Garces Luis J.
Plunkett Allan B.
Ritter Allen M.
Davis Jr. James C.
General Electric Company
Mollon Mark L.
Smith Jr. David
Snyder Marvin
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