Traction motor controller for forklift vehicles

Details Traction motor controller for forklift vehicles Traction motor controller for forklift vehicles

1990-05-07

1991-12-03

Ro, Bentsu

Electricity: motive power systems

Battery-fed motor systems

318493, 388803, H02P 706

Patent

active

050702831

ABSTRACT:
A system for controlling separately excited shunt-wound dc motors, where control is achieved through microprocessor-based independent PWM control of a chopper (armature) and an H-bridge (field). Connected to the armature is an armature voltage amplifier for varying the applied armature voltage. A field voltage amplifier is also provided for determining the direction of motor rotation and varying the voltage applied to the field winding. A first sensor is connected to the motor armature in order to determine the motor rotational speed. A second sensor is connected to the armature circuit in order to determine the armature current. A third sensor is connected to the field circuit in order to determine the field current. A decoupling controller uses the motor speed and armature current information, and adjusts the armature voltage and the field voltage. An optimal controller uses the motor speed, field current and armature current information, and adjusts the armature voltage and the field voltage.

REFERENCES:
patent: 4079301 (1978-03-01), Johnson, III
patent: 4196377 (1980-04-01), Boxer
patent: 4410842 (1983-10-01), Owen
patent: 4422022 (1983-12-01), Hill et al.
patent: 4475070 (1984-10-01), Wilkerson
patent: 4484117 (1984-11-01), Bose
patent: 4549122 (1985-10-01), Berkopec et al.
patent: 4801855 (1989-01-01), Nohmi et al.
patent: 4845413 (1989-07-01), Hackl et al.

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