Electricity: motive power systems – Generator-fed motor systems having generator control – Automatic generator control and/or with time-delay means
Patent
1998-07-31
1999-12-07
Ro, Bentsu
Electricity: motive power systems
Generator-fed motor systems having generator control
Automatic generator control and/or with time-delay means
318145, 318158, 361145, 414606, 414737, H02P 900, B66C 108
Patent
active
059989440
ABSTRACT:
An apparatus and method for controlling a lifting magnet (12) of a materials handling machine (10) to eliminate arcing between contacts (70-80) within the magnet controller (26) as is well as is large voltage spikes. The controller (26) selectively excites the shunt field windings (66,68) of a direct current generator (22). The magnitude and direction of the current passing through the shunt field windings (66,68) is varied by the magnet controller (26) to control the magnitude and polarity of the voltage at the generator output (23). The armature (60) of the generator (22) is rotatably driven by a hydraulic motor at an essentially constant speed to minimize voltage variations at the output (23) of the generator (22). At least the drop cycle is controlled through use of a current transducer (200) that senses current flowing to the lifting magnet so that the electronic controller is able to control the flow of current to the lifting magnet based upon the sensed current in the magnet circuit.
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Chlad Kenneth J.
Clutter Ronald W.
Cooper Timothy L.
Robinson Charles A.
Caterpillar Inc.
Ro Bentsu
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