Linear motor having automatic armature windings switching at min

Details Linear motor having automatic armature windings switching at min Linear motor having automatic armature windings switching at min

1998-02-26

1999-08-24

Ramirez, Nestor

Electrical generator or motor structure

Dynamoelectric

Linear

318135, H02K 4100

Patent

active

059428171

ABSTRACT:
A linear motor having motor magnets on a movable stage, also includes non-interleaved armature windings on a path. The magnets are arranged m along the span A of the movable stage. The armature windings are arranged with n windings occupying a distance equal to the span S. A switching device automatically switches power on to the armature windings entering the span, and switches power off to the windings leaving the span. The switching is done when the a magnet is aligned with the coil whose power is being switched on or off in order to minimizes switching noise. Switching is conveniently done using Hall effect devices controlling the switches, and a switching magnet, movable with the stage, having a length equal to the span. As the switching magnet comes within magnetic interaction distance of a Hall effect device, the Hall effect device closes its associated switch. As the switching magnet moves out of magnetic interaction distance with the Hall effect device, the Hall effect device closes its associated switch. The array of magnets includes one additional magnet outside each end of the span to maintain a sinusoidal magnetic field strength across the entire span.

REFERENCES:
patent: 4721892 (1988-01-01), Nakamura et al.
patent: 4760294 (1988-07-01), Hansen
patent: 4769580 (1988-09-01), Heidelberg et al.
patent: 4912746 (1990-03-01), Oishi
patent: 5136217 (1992-08-01), Hoffman et al.
patent: 5497038 (1996-03-01), Sink
patent: 5701042 (1997-12-01), Takei
patent: 5703417 (1997-12-01), Kelly

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