Electricity: motive power systems – Limitation of motor load – current – torque or force
Reexamination Certificate
2005-06-14
2005-06-14
Ip, Paul (Department: 2837)
Electricity: motive power systems
Limitation of motor load, current, torque or force
C318S292000, C318S293000, C318S599000, C318S434000
Reexamination Certificate
active
06906484
ABSTRACT:
A method of limiting current in a DC motor acts on a full bridge circuit (137) through which the stator winding arrangement (102) of that motor is supplied with current. Upon response of the current limiter, energy supply to the stator winding arrangement (102) from the DC power network is interrupted. The stator winding arrangement is then operated substantially in short circuit via semiconductor switches of the full bridge circuit, and the decaying current flowing in that context serves substantially to continue driving the motor. When that current has reached a lower value, energy supply from the DC power network to the motor is once again activated. The effective value of the current flowing to the motor is preferably reduced when the current limiter responds. The time period during which that current flows, in the form of current blocks, is then increased in compensatory fashion.
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Berroth Hansjörg
Hahn Alexander
Heller Frank
Jeske Frank
Karwath Arno
ebm-papst St. Georgen GmbH & Co. KG
Ip Paul
Oliver, Esq. Milton
Ware Fressola Van Der Sluys & Adolphson LLP
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