Patent ID: 7965004

Claim:
An electric motor ( 10 ) which comprises: a stator ( 12 ), a rotor ( 14 ) rotatable about a rotation axis ( 85 ) having a sensor magnet ( 82 ) with an even-numbered plurality of sensor poles ( 71 , 72 , 73 , 74 ), said sensor magnet ( 82 ) being formed with a magnetic flux density distribution producing a magnetic flux which, over an angular sector, has a sinusoidal profile; a shaft ( 87 ) and a bearing tube ( 20 ) for rotatably supporting said sensor magnet ( 82 ), the shaft ( 87 ) and sensor magnet ( 82 ) being rotatably supported in the bearing tube ( 20 ); at least two analog rotation sensors ( 460 , 465 ) for producing rotor position signals (B_S 1 , B_S 2 ) which signals characterize the magnetic flux density of the magnetic flux acting, from the sensor magnet ( 82 ), on the respective sensor ( 460 , 465 ), and which analog rotor position sensors ( 460 , 465 ) are arranged adjacent a periphery of the sensor magnet ( 82 ) and outside said bearing tube ( 20 ), on a common flat support arrangement ( 468 ) that is parallel to the rotation axis ( 85 ) of the sensor magnet, near a point at which said arrangement is intersected by a first plane ( 470 ) perpendicular to the rotation axis ( 85 ), said analog rotor position sensors ( 460 , 465 ) being arranged on the support arrangement ( 468 ) at a distance from one another, such that, during operation, they generate two sinusoidal signals having a phase shift of 90° with respect to each other; and a signal generator ( 90 ) for generating at least one pulse-shaped signal (A, B) from the two sinusoidal rotor position signals (B_S 1 , B_S 2 ) that are phase-shifted by 90°.