Apparatus for controlling a pump motor of a forklift truck

Details Apparatus for controlling a pump motor of a forklift truck Apparatus for controlling a pump motor of a forklift truck

1998-04-23

2000-03-21

Martin, David

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Armature control by digital or combined analog and digital...

388815, 388930, 318430, 318432, H02P 517

Patent

active

060411635

ABSTRACT:
A pump motor control apparatus is adapted to control a pump motor of a forklift truck by using a driving transistor connected between a battery and the pump motor. The pump motor control apparatus includes a current detection circuit for detecting a current flowing through the pump motor to generate a current detection signal representing the current. A controller is employed to determine the load condition based on the current detection signal to thereby generate a control signal for use in the control of the driving transistor. The control signal is a pulse width modulation signal whose on-duty ratio is controlled depending on the load condition so as to decrease the torque and speed of the pump motor during the unloaded condition but to increase the torque and speed of the pump motor during the loaded condition.

REFERENCES:
patent: 4673851 (1987-06-01), Disser
patent: 4933614 (1990-06-01), Kawata

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