Sewing machine drive motor control system

Details Sewing machine drive motor control system Sewing machine drive motor control system

1979-04-09

1982-04-06

Smith, Jr., David

Electricity: motive power systems

Braking

Dynamic braking

318269, 318345G, H02P 516

Patent

active

043238335

ABSTRACT:
A braking and speed-control circuit is disclosed which prevents excessive current from being dissipated in a DC series motor. The circuit includes two free-wheeling diodes, a forward-biased diode, and a thyristor. The forward-biased diode is placed between the field coil and the armature winding of the motor. One free-wheeling diode is placed across the entire motor circuit, including the forward-biased diode. The other free-wheeling diode is placed across the forward-biased diode and the field coil. The thyristor can short across the forward-biased diode and the armature winding.

REFERENCES:
patent: 3188547 (1965-06-01), Zelina
patent: 3189811 (1965-06-01), King
patent: 3325714 (1967-06-01), Torii
patent: 3544873 (1970-12-01), Gunsser et al.
patent: 3705990 (1972-12-01), Pileckis
patent: 3753059 (1973-08-01), Berman
patent: 3812409 (1974-05-01), Dinger
patent: 3848169 (1974-11-01), Asano et al.
patent: 4013933 (1977-03-01), Dohi et al.

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