Switch for a variable-speed induction motor
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United States of America Patent
Stats
-
Sep 20, 2005
Grant Date -
N/A
app pub date -
Sep 9, 2004
filing date -
Sep 9, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A switch for a variable-speed induction motor includes conductive connecting pieces, a rotary member, and a driving unit. The connecting pieces are mounted in a housing, are adapted to be connected to the induction motor, and have distal contact parts that surround an axis of the housing. The distal contact parts of any two of the connecting pieces form either an angular or height difference therebetween with respect to the axis. The rotary member is rotatable about the axis inside the housing, and is formed with contacting regions that are arranged along the axis and that are in sliding contact with the distal contact parts. The driving unit is operable so as to drive rotation of the rotary member about the axis such that the connecting pieces are bridged selectively and electrically by the contacting regions of the rotary member for varying the speed of the induction motor.
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