Ripple counter for multi-pole motors
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United States of America Patent
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Sep 30, 2014
Grant Date -
Apr 25, 2013
app pub date -
Oct 19, 2012
filing date -
Oct 21, 2011
priority date (Note) -
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Abstract
An electric motor includes at least one first brush and at least one second brush, which are arranged in a stationary fashion and arranged to contact a commutator that rotates with a rotor. The commutator includes at least one cylindrical section with a circumferential surface on which a plurality of segments are arranged with insulating sections interposed between them. In order to detect the rotating speed and position of the rotor, the motor includes brushes with asymmetric circumferential widths or angles or a stator with an uneven magnetization. The motor is arranged to detect only one signal when the rotor rotates for an angle between two adjacent segments.
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