Electric micromotor
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United States of America Patent
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Nov 25, 2014
Issued Date -
N/A
app pub date -
Feb 3, 2012
filing date -
Feb 4, 2011
priority date (Note) -
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Abstract
A miniature electric motor (1) with an outer diameter (DA) that is smaller than or equal to 6 mm, has a hollow cylindrical stator (2) with stator coils (8) and a magnetic rotor (4) rotatably arranged around a rotational axis (16) in the stator (2) by means of a rotor shaft (10). The stator coils (8) can be energized in order to generate a magnetic rotational field in dependence upon the rotational position of the magnetic rotor (4). A sensor chip (20) having at least one magnetic field sensor (22) is arranged in such a manner in an area axially adjacent to a front face of the magnetic rotor (4) located within a plane that is vertical to the rotational axis (16) that the magnetic field sensor (22) is impinged in such a way by the magnetic field that the rotational position of the rotor can be evaluated.
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