Method and apparatus for dynamic braking in a motor control syst

Details Method and apparatus for dynamic braking in a motor control syst Method and apparatus for dynamic braking in a motor control syst

1980-04-22

1981-10-13

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Braking

318758, 318375, H02P 322

Patent

active

042950864

ABSTRACT:
A controlled current inverter motor control system including a controlled source of direct current for supplying a variable frequency inverter by way of a direct current link circuit which includes, within the link circuit, a selectively insertable dynamic braking resistive element. Upon a call for a dynamic braking mode of operation, the source of direct current is short circuited and the normal operational or running control of the motor is discontinued. Special circuitry is provided which then forces a special frequency control of the inverter to thus control the angle between the motor flux and motor current to a prescribed value proportional to the extant value of a motor operating parameter (motor current or motor flux) prior to the insertion of the dynamic braking resistive element into the link circuit.

REFERENCES:
patent: 3688171 (1972-08-01), Salihi et al.

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