Controlled current inverter with angle command limit

Details Controlled current inverter with angle command limit Controlled current inverter with angle command limit

1980-04-22

1982-02-02

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318803, 318808, H02P 540, H02P 742

Patent

active

043141900

ABSTRACT:
A controlled current inverter system forms the basis of an AC motor drive system for furnishing the motor load 18 with a variable frequency, variable magnitude AC current from an inverter 14 which is supplied from a variable DC current source such as a converter 12 by way of a DC link including an inductor 17. Motor speed and torque are controlled through the control of motor current I.sub.M and angle .theta., which is the angle formed between vectors designating motor current and flux through first and second control signal channels 39 and 59 coupled to the DC source 12 and the inverter 14, respectively. A control function of this angle, defined in terms of both method and apparatus, is implemented by means 61 and 63 which limits this angle to predetermined values for relatively low levels of motor current, for example, values of current corresponding to the current required for maintaining a minimum amount of motor flux. Thus, if actual motor current becomes lower than the anticipated motor current, the angle .theta. will be limited in a manner which maintains a minimum motor flux.

REFERENCES:
patent: 3863134 (1975-01-01), Pollard
patent: 4160940 (1979-07-01), Wolf
patent: 4230979 (1980-10-01), Espelage et al.
Phillips, K. P., "Current-Source Converter For AC Motor Drives," Transactions on Industry Applications, Nov./Dec. 1972.

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