Dynamic brake control

Details Dynamic brake control Dynamic brake control

1987-03-06

1988-08-02

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

Braking

318758, 318800, 318762, 318760, 187119, H02P 318

Patent

active

047616008

ABSTRACT:
A dynamic brake control system for an alternating current motor powered by a variable voltage, variable frequency inverter which regulates the speed of the motor. An AC to DC converter converts AC line power to DC power with the DC power being transferred to the inverter via a DC link. During electrical dynamic braking, the inverter functions to transfer power from the motor to the DC link. The torque available to the motor during braking is a function of the receptivity of the DC link. Link receptivity controlled by a resistance connected to the link in which the resistance is modulated at a frequency dependent upon the incoming AC line frequency at the converter. The modulation is binarily controlled so as to minimize ripple current on the DC link without the necessity of providing high frequency control of the modulating electronics.

REFERENCES:
patent: 4039914 (1977-08-01), Steigerwald et al.
patent: 4215304 (1980-07-01), D'Atre et al.
patent: 4503940 (1985-03-01), Watanabe

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