Speed control device for DC motors

Details Speed control device for DC motors Speed control device for DC motors

1998-04-03

2000-05-23

Shaw, Clifford C.

Electric heating

Metal heating

By arc

388937, B23K 912

Patent

active

060668342

ABSTRACT:
A speed control device is provided such that the speed of DC motors is controlled to remain constant with varying voltages supplied from a power source. A given application for such a speed control device is in the use of portable, hand-held Metal Inert Gas (MIG) welders. The power requirements of a portable MIG welder are twofold. Power is required for the generation of a welding current to enable the workpieces to be sufficiently heated and thus, welded together, and power is also required to drive a wire spooler which provides wire at a constant rate, leading to accurate and consistent welds. The speed control device provided ensures constant power delivery for both power requirements, regardless of variations in the voltage of a power supply and irrespective of a mechanical load asserted on the welder.

REFERENCES:
patent: 4703156 (1987-10-01), Hayes
patent: 4851743 (1989-07-01), Schmerda et al.
patent: 5086208 (1992-02-01), Habermann
patent: 5289560 (1994-02-01), Abney
patent: 5609782 (1997-03-01), Kim
patent: 5889922 (1999-03-01), Bufe et al.

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