Speed control device for dc motors

Details Speed control device for dc motors Speed control device for dc motors

H - Electricity

02

P

H02P 5/00 (2006.01) H02P 7/24 (2006.01)

Patent

CA 2233837

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 powerrequirements, regardless of variations in the voltage of a power supply and irrespective of a mechanical load asserted on the welder.

Régulateur de vitesse permettant de maintenir constante la vitesse de moteurs à courant continu malgré les variations de tension du courant fourni par une source d'alimentation. L'invention trouve une application dans l'utilisation de soudeuses MIG à main portables. Les besoins d'alimentation d'une soudeuse MIG portable comportent deux volets. L'alimentation doit permettre de disposer d'un courant de soudage pouvant assurer un chauffage suffisant des pièces pour qu'elles puissent se souder et aussi d'avoir le courant voulu pour entraîner une bobine qui fournit le fil à un rythme constant de manière à obtenir des soudures précises et homogènes. Le régulateur de vitesse de la présente invention assure une alimentation constante pour répondre aux deux besoins, indépendamment des variations de tension de la source d'alimentation ou d'une charge mécanique s'exerçant sur la soudeuse.

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