Peak current control in the armature of a DC motor during plug-b

Details Peak current control in the armature of a DC motor during plug-b Peak current control in the armature of a DC motor during plug-b

1991-04-15

1992-12-15

Wysocki, A. Jonathan

Electricity: motive power systems

Braking

'plugging' or application of reverse power to motor

318370, 318380, H02P 300

Patent

active

051720388

ABSTRACT:
The present invention features an electric motor control system combination with at least one electric motor having a field winding and an armature winding connected in series. The system also includes a first power terminal, a second power terminal, a current-limiting resistor, and a current sensor. The current-limiting resistor and the current sensor are connected in series between the first power terminal and the second power terminal. A contactor has a contact operable to shunt the current-limiting resistor. A microcomputerized control connected to the contactor and the current sensor governs the contractor to shunt the current-limiting resistor when the electric motor is not in a plugged condition. The contactor is operative when the current sensor detects a substantially zero current through the electric motor. The microcomputerized control continuously regulates power being supplied to the electric motor and provides optimum armature current in all operative modes of the electric motor, including a braking mode. This results in smooth braking that is accomplished with a minimum of armature heating.

REFERENCES:
patent: 3826962 (1974-07-01), Morton et al.
patent: 3911342 (1975-10-01), Herwig
patent: 3958163 (1976-05-01), Clark
patent: 3995204 (1976-11-01), Konrad et al.
patent: 4092577 (1978-05-01), Markham
patent: 4104571 (1978-08-01), Gurwicz et al.
patent: 4240015 (1980-12-01), White
patent: 4529919 (1985-07-01), Melocik et al.
patent: 4804893 (1989-02-01), Melocik
patent: 4933611 (1990-06-01), Albanesius et al.

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