Rotary component rotational speed detecting device, has magnet producing background field in sensor element, where field is influenced by transmitter wheel dependent on rotational speed of component

摘要

The device has a transmitter wheel associated to a rotary component (1). A number of revolutions of the rotary component are detected. A sensor element (4) is pre-stressed with a magnet (5). Another stationary component (3) is arranged between the former component and the sensor element. The magnet assigned to the sensor element produces a background field in the sensor element, where the field is influenced by the transmitter wheel dependent on a rotational speed of the former component. The transmitter wheel is made of ferrous magnetic material.