| 摘要 |
An electric motor ( 10 ) has: a stator ( 12 ) and a rotor ( 14 ) having a shaft ( 87 ). The rotor ( 14 ) has a sensor magnet ( 82 ) having a number SP of sensor poles ( 71, 72, 73, 74 ) for generating a predetermined distribution of the magnetic flux density, such that SP=2, 4, 6, 8, etc. The motor also has at least two rotor position sensors ( 450, 455, 460, 465 ) for generating rotor position signals (B_S 1 , B_S 2 ) characterizing the magnetic flux density, the rotor position sensors ( 450, 455, 460, 465 ) being arranged in the region ( 30 ) of the circumference of the sensor magnet ( 82 ). The motor also has an evaluation apparatus ( 32 ) that ascertains, from the rotor position signals (B_S 1 , B_S 2 ), an absolute value (phi_el, phi_mech) for the rotational position of the rotor ( 14 ). A method of generating an absolute value for the rotational position of an electric motor is likewise described.
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