Protective method and apparatus for a controlled current inverte

Details Protective method and apparatus for a controlled current inverte Protective method and apparatus for a controlled current inverte

1980-04-22

1982-12-28

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318762, 318803, 318807, H02P 540

Patent

active

043664270

ABSTRACT:
A controlled current inverter system forms the basis of an AC motor drive system for furnishing a motor load 22 with a variable frequency, variable magnitude AC current from a thyristor controlled DC to AC inverter 16 which is supplied current from a thyristor controlled AC to DC converter 10 by way of a DC link including an inductor 14. The frequency of the inverter is controlled by means of a control circuit including a voltage controlled oscillator 18. In the event that the converter 10 operates in such manner as to place a short circuit across the DC link 14 during a regenerative mode of operation of the motor 22, apparatus 36 is shown and described and a method is disclosed for providing a momentary advance gating of the inverter 16 which causes the motor 22 to shift from the existing regenerative mode toward a motoring mode and thereby quench any build-up of excessive converter-inverter circulating currents.

REFERENCES:
patent: 3859579 (1975-01-01), Plunkett
patent: 4230979 (1980-10-01), Espelage et al.

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