System for preventing malfunction of a switching circuit for linear motor
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United States of America Patent
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Aug 14, 2001
Grant Date -
N/A
app pub date -
Apr 7, 2000
filing date -
Jun 24, 1999
priority date (Note) -
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Abstract
There is disclosed a system for preventing malfunction of a switching circuit for a linear motor capable of preventing malfunction of the switching circuit due to magnet flux from the permanent magnet mounted on the movable element, the system including sensing magnets provided at a longitudinal one side of a movable element having a plurality of permanent magnets mounted thereon, a plurality of Hall sensors mounted on the stator element and used for controlling current flow into a plurality of armature coils by turning on/off a switching circuit, based upon the sensing of magnet flux generated from the sensing magnets, and dummy sensing magnet provided at one side end of the sensing magnet in such a manner that its polarity is opposite to that of the sensing magnet, and for preventing magnets flux generated from the plural permanent magnets from introducing into the plural Hall sensors.
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