PM stepping motor
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United States of America Patent
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May 29, 2018
Issued Date -
N/A
app pub date -
Oct 23, 2014
filing date -
Oct 24, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
A PM stepping motor includes a two-phase stator which includes first and stator stators, and a rotor which is rotatably supported inside the two-phase stator. Each of the first and second stators includes an outer yoke, an inner yoke and a coil. Each of the first and second stators is formed with a convex portion and a concave portion. The convex portion formed on the inner yoke of the first stator is engaged with the concave portion formed on the inner yoke of the second stator. The inner yoke is formed with two protrusions engaged with a cutout of the outer yoke. The convex portion and the concave portion are arranged line-symmetrically with respect to a center line passing through a center point of the inner yoke and a center position between the two protrusions, and an angle θ between each position and the center line ranges 30°<θ<90°.
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