Angular position detector for rotor of electric motor - has magnetic sensor influenced by driven rotary element divided into even number of segments with alternate slots modifying state of sensor

摘要

The device has a magnetic or an electromagnetic sensor (2) arrangement and a rotating magnetic circuit (1) driven by the rotating component to pass in front of the sensor (2). The magnetic circuit (1) is of a circular shape divided into two or any even number of sectors (8,13). Alternate sectors (13) have a slot (14) passing in front of the sensor (2), the other sectors have a solid part (11) passing in front of the sensor (2). The sensor (2) state is thus alternately modified during the rotation of the magnetic circuit (1). The device is simple, accurate, reliable, statically and dynamically balanced and gives the position when the component is rotating or at rest. The device can be used to detect the angular position of a rotor of a motor.