Method and apparatus for yarn end-down detection in a textile ya

Details Method and apparatus for yarn end-down detection in a textile ya Method and apparatus for yarn end-down detection in a textile ya

1991-08-30

1993-04-13

Shoop, Jr., William M.

Electricity: motive power systems

With particular motor-driven load device

Tension-maintaining type of motor-control system

318456, 318461, 66157, 388813, B65H 5938

Patent

active

052026108

ABSTRACT:
Method and apparatus for detecting breakage in a yarn strand being wound onto a yarn support member rotatably driven by a DC motor and having a closed-loop motor control system for maintaining a desired velocity of the motor and for signaling commutation of the phases of the motor during the yarn winding operation. The closed-loop motor control system monitors the signal conduction angles delivered to commutate the phase windings of the motor, detects a sudden minimum preestablished decrease in the monitored conduction angles, and generates a control signal in response to a sudden decrease in the conduction angle resulting from a yarn strand breakage. The control signal may be employed to stop current supply to the motor.

REFERENCES:
patent: 3571680 (1971-03-01), Tellerman et al.
patent: 3805244 (1974-04-01), Tooka
patent: 3813583 (1974-05-01), Akiyama
patent: 4063304 (1977-12-01), Ogura et al.
IEE Power Electronics & Variable-Speed Drives Conference, London, Jul. 1988; paper entitled "Four-Quadrant Brushless Reluctance Motor Drive", T. J. E. Miller et al., published Jul. 1988, (4 pages).
IEE Power Electronics & Variable-Speed Drives Conference, London, Jul. 1990; paper entitled "A New Control IC For Switched Reluctance Motor Drives", T. J. E. Miller et al., published Jul. 1990 (5 pages).

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