Electrical generator or motor structure – Dynamoelectric – Linear
Patent
1990-04-02
1991-09-10
Beha, Jr., William H.
Electrical generator or motor structure
Dynamoelectric
Linear
318135, H02K 41025, B60L 1302, G05B 1158
Patent
active
050476769
ABSTRACT:
A brushless dc linear actuator includes a guide rail which extends in a longitudinal direction, and at least one moving member such as a slide, each of which is movable along the guide rail in the longitudinal direction. Each moving member includes permanent magnets. Rail supports are provided for each end of the guide rail and for holding the guide rail substantially horizontal. The moving member is propelled electromagnetically forward and backward along the rail by sequential activation of at least one series of electromagnetic coils distributed longitudinally with a predetermined pitch. A Hall-effect arrangement, including one Hall-effect element adjacent to each coil, provides non-impulsive, gradual activation and shut-off of active ones of the coils within a predetermined distance of the permanent magnets of the moving member. The pitch of the coils is determined as a precise function of the width of the permanent magnets, a phase simulation constant, and a coil selection constant.
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Beha Jr. William H.
Hitachi Metals Ltd.
Rebsch D. L.
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