Automatic control of torque or force at moving loads

Details Automatic control of torque or force at moving loads Automatic control of torque or force at moving loads

1994-08-19

1997-04-22

Martin, David S.

Electricity: motive power systems

Constant motor current, load and/or torque control

318 6, H02P 700

Patent

active

056231890

ABSTRACT:
The invention generates a correction signal for the command input to an automatic feedback control system or servomechanism used to control the torque, force, or tension acting upon an object or payload that is stationary or is moving relative to the motor housing. The correction signal is proportional to the sum of the torque acceleration and velocity errors. The "torque acceleration error" is the product of the inertia, referred to the motor shaft, and the motor acceleration. The "torque velocity error" is the product of the external damping factor acting on the motor shaft and the motor velocity. The correction is required when the steady state value of motor torque output is sensed and used for the negative feedback signal; this measurement is accomplished with relative ease. The correction would not be necessary if the torque or force were measured or sensed at the moving payload, but this is very difficult, expensive, and is often impractical due to unpredictable characteristics of the payload or possible damage to the payload. The invention also reduces errors by limiting acceleration and velocity of the payload, when its motion is controlled. A common application is machines used for winding or unwinding flexible membranes, such as plastic film or steel cable on reels or drums.

REFERENCES:
patent: 4587469 (1986-05-01), Ikebe et al.
patent: 4992715 (1991-02-01), Nakamura et al.
patent: 5263113 (1993-11-01), Naitoh et al.

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