Electric motor for use in speed determining system, has flux deflecting unit provided at rotor to cause deflection of magnetic flux depending on position of rotor shaft, so that flux is changed by sensor depending on position of shaft

摘要

The motor has a rotor with a rotor shaft (12), and a magnetic field sensor (15) for detecting a change of a direction and/or strength of a magnetic flux. Magnets (11, 16) are provided for producing the magnetic flux. A flux deflecting unit is provided at the rotor to cause deflection of the magnetic flux depending on the position of the rotor shaft, so that the flux is changed by the sensor depending on the position of the shaft. A magnetic field of the magnets penetrates the sensor with strength, with which a flux deviation of the sensor is detectable in a positive and negative direction.