Transient load damping circuit for excavator

Details Transient load damping circuit for excavator Transient load damping circuit for excavator

1976-05-20

1977-06-21

Dobeck, B.

Electricity: motive power systems

Constant motor current, load and/or torque control

318433, 318140, 318141, H02P 700

Patent

active

040314405

ABSTRACT:
A Ward-Leonard drive system for a dragline excavator includes a feedback circuit which connects to the motor-generator armature loop to sense a signal proportional to motor armature counter emf and rate of change of armature current. The feedback circuit takes the second derivative of this signal and applies it to a circuit which controls motor speed and torque. The feedback circuit alters the response of the drive system to sudden increases in motor load caused by rough digging and thereby reduces transient loading on the mechanical elements of the drive system.

REFERENCES:
patent: 3867678 (1975-02-01), Stoner

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