Patent ID: 8896163

Claim:
A miniature electric motor ( 1 ) with an outer diameter (D A ) that is smaller than or equal to 6 mm, comprising, a hollow cylindrical stator ( 2 ) with stator coils ( 8 ), a magnetic rotor ( 4 ) arranged so as to rotate around a rotational axis ( 16 ) in the stator ( 2 ) by means of a rotor shaft ( 10 ), wherein 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 ) arranged concentrically with respect to the rotational axis ( 16 ), having at least four magnetic field sensors ( 22 ), and arranged 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 ) for the purpose of detecting the rotational position of the magnetic rotor ( 4 ), wherein the sensor chip ( 20 ) is spaced from an adjacent front face of the magnetic rotor ( 4 ) via an axial gap (A) in such a way that the magnetic field of the magnetic rotor ( 4 ) passes through several components until it reaches the area of the sensor chip ( 20 ) and that the magnetic field sensors ( 22 ) are impinged in such a way by the magnetic field of the magnetic rotor ( 4 ) that the magnetic field can be evaluated in order to determine the rotational position of the rotor.