Coreless motor
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United States of America Patent
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-
Aug 23, 2011
Grant Date -
Nov 26, 2009
app pub date -
May 12, 2009
filing date -
May 20, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
A coreless motor able to be downsized and easy to be assembled and to ensure the concentricity between a motor shaft, a magnet, and an outer cylinder. The coreless motor includes an outer cylinder gear unit having an output shaft and a speed-reducer mechanism incorporated into a field assembly having a magnet fitted on an inner yoke and an outer cylinder fitted on an outer periphery of the magnet, a motor shaft unit having an inner lid rotatably supporting a motor shaft via ball bearings, a rotor unit having a circular plate attached with a commutator electrically connected to a coil, an outer lid unit having an outer lid mounted with brushes. The inner lid is incorporated in the inner yoke, the coil is incorporated in between the outer cylinder and the magnet, and the outer lid unit is attached to the rotor unit and the outer cylinder.
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