Linear motor apparatus

Details Linear motor apparatus Linear motor apparatus

2006-01-10

2006-01-10

Schuberg, Darren (Department: 2834)

Electricity: motive power systems

Linear-movement motors

Reexamination Certificate

active

06984945

ABSTRACT:
A linear motor apparatus which drives a mover of a linear motor in a stable manner, by using only information on change of relative position, without using an absolute value sensor. The apparatus has a coil array of plural phases of coils and a magnet relatively movable to the coil array, plural drivers, at least one of which being provided for each phase, to feed a current to all the same phase coils of the coil array, a sensor for measuring a change of relative position of the magnet moved by the current to the coil array, and a controller to determine the polarity of the current applied to the same phase coils based on the change of the relative position measured by the sensor, and apply a drive current to drive the magnet in a desired direction to the same phase coils.

REFERENCES:
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patent: 4789815 (1988-12-01), Kobayashi et al.
patent: 5757149 (1998-05-01), Sato et al.
patent: 8-111998 (1996-04-01), None
patent: 6-284785 (1997-10-01), None
patent: 11-316607 (1999-11-01), None
patent: 11-341853 (1999-12-01), None

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