초록 ▼

A device for detecting the speed of rotation and/or an angle of rotation of a shaft having a motion transmitter which rotates with the shaft, the device consisting of a magnetic-field-dependent sensor which receives a signal from the motion transmitter. A permanent magnet is arranged in the vicinity

A device for detecting the speed of rotation and/or an angle of rotation of a shaft having a motion transmitter which rotates with the shaft, the device consisting of a magnetic-field-dependent sensor which receives a signal from the motion transmitter. A permanent magnet is arranged in the vicinity of the sensor with an evaluating circuit, the sensor being an integrating component of the evaluating circuit. The arrangement of the permanent magnet with respect to the sensor and of the permanent magnet and sensor with respect to the motion transmitter, on the one hand, and the construction of the sensor as a saturable-core probe (fluxgate effect), on the other hand, make it possible to detect even very slow rotational movements such as occur, for example, with antiblocking systems or forward drive control systems in motor vehicles.

대표청구항 ▼

A device for detecting one of a speed of rotation and an angle of rotation of a shaft, having a ferro-magnetic motion transmitter which rotates with the shaft and which has on a periphery thereof areas of high magnetic permeability and areas of low magnetic permeability and configured as one of a to

A device for detecting one of a speed of rotation and an angle of rotation of a shaft, having a ferro-magnetic motion transmitter which rotates with the shaft and which has on a periphery thereof areas of high magnetic permeability and areas of low magnetic permeability and configured as one of a toothed wheel and a perforated disc, a magnetic-field-dependent sensor means for sensing motion of the motion transmitter and arranged at a distance from the motion transmitter and comprising a soft-magnetic planar strip core of high permeability and low hysteresis and eddy-current losses, an evaluating circuit having a coil wound onto the said strip core transversely to a longitudinal direction of the strip core, a permanent magnet arranged at a distance from the motion transmitter and sensor, the sensor, permanent magnet and motion transmitter being substantially linearly disposed with respect to each other with the sensor remote with respect to the motion transmitter with lines of magnetic force of the permanent magnet passing substantially perpendicularly through a flat side of the strip core and through said evaluating circuit and wherein said permanent magnet having poles disposed substantially equidistant from the periphery of the motion transmitter and disposed between the motion transmitter and the sensor and lying substantially in the plane of the strip core, the strip core of the sensor being aligned in a longitudinal direction substantially perpendicular to a magnetic axis of the permanent magnet and to the motion transmitter, and means for driving the strip core into saturation in response to a high frequency current.