A wheel speed sensor assembly includes a rotor formed with first and second protrusions arranged circumferentially on the outer periphery thereof in two separate rows at an equal angular pitch. The first protrusions are angularly displaced from the respective second protrusions by half the angular pitch of the first or second protrusions. The sensor assembly further includes a senor having two magnetoelectric devices each opposing the first protrusions or second protrusions. With this arrangemen...

A device for sensing the input shaft speed of an automotive automatic transmission that is driven by the engine through the fluid coupling of a torque converter. The speed sensor device includes circumferentially spaced markings about the transmission input shaft and a speed sensor that is placed at close proximity to the circumferentially spaced markings through a hole in the torque converter stator shaft. An electronic control unit (ECU) analyzes the sensor output signal and in the case of an ...

A moving object detection device has a magnetic sensor element, a permanent magnet for applying a magnetic field to the magnetic sensor element; a board on which electronic parts are mounted, a holder; and a case. The holder has an integral approximately box-shaped support part to hold the magnet and the board, and the holder is inserted into the case so that the magnetic sensor element, the permanent magnet, and the board are contained in the case. The holder and the case are fitted and fastene...

A two-wire type current output sensor includes two external connection terminals to one of which a power supply flows from an outside and from the other one of which the power supply flows to the outside, a detecting element capable of outputting a detection signal, a signal processing circuit for changing a current supplied to a power supply side of the signal processing circuit based on the detection signal of the detecting element and outputting the changed current, and a connection switching...

A rotor of a sensor-less motor has a multiplicity of magnetic poles, with one magnetic pole giving a smaller magnetic flux than other the magnetic poles. A coil is provided at a predetermined position external to the rotor. An induction signal is generated in the coil as the magnetic flux through it is changed by the rotation of the rotor. An index signal indicative of the reference rotational position of the rotor is generated based on the change in the induction signal. Thus, the reference rot...

An evaluation method for an output signal of a sensing device for scanning a cyclic movement, consisting of a rotatable pole wheel provided with equidistant teeth and an inductive sensor, permits recognition and display of damage to the pole wheel, in particular defective or missing teeth. Contrary to known evaluation processes, where error monitoring of the output signal is carried out for a relatively short time period comprising few signal cycles of the output signal, an observation of the ou...

A speed detector including a circular rotational member having a plurality of equally spaced-apart teeth on the outer circumference thereof, and first and second magnetic sensors. The first and second magnetic sensors each comprise a permanent magnet, a magnetic pole which permits the passage therethrough of a magnetic flux generated by the permanent magnet, and a detection coil wound on a portion of the magnetic pole. The magnetic poles of the first and second magnetic sensors are disposed in c...

Disclosed is an apparatus for generating a pulse train whose instantaneous repetition rate represents the instantaneous angular velocity of a rotating device. An oscillator feeds a high frequency signal to a coil through which a center pole of magnetic material projects. The rotating device causes an object such as a gear to rotate, at least a portion of the extremity of which (e.g., the tips of its teeth, in the case of a gear) repeatedly comes into close contact with the tip of the center pole...

Method and apparatus for achieving adiabatic demagnetization of an electron spin echo sample for enhancing the dynamic range and operable repetition rate of electron spin echoes by applying a "preparation" pulsed magnetic field of a predetermined field strength and direction to the sample located in a resonant cavity prior to the application of a pair of successive microwave pulses orthogonally to a relatively smaller static, unidirectional magnetic field so that a spin echo signal is produced b...

A variable reluctance magnetic transducer including a tubular housing having a closed end and an open end. A bracket is attached to the outside of the housing a predetermined distance form the closed end of the housing. A core supporting a ferrous metal pole piece and a permanent magnet is disposed within the housing with an end of the pole piece contacting the inside of the closed end of the housing to accurately position the pole piece end relative to the bracket. The core supports a pair of f...