A rotation detection apparatus includes a magnetic field generation source, a spin valve element, and a calculator. The magnetic field generation source is rotatable while generating a magnetic field, and has a temperature coefficient of residual magnetic flux density having an absolute value of 0.1%/° C. or less. The spin valve element includes a magnetic layer configured to generate a movement of a magnetic domain wall in accordance with a change in direction of the magnetic field associated with a rotation of the magnetic field generation source. The calculator is configured to detect a change in resistance of the spin valve element caused by the movement of the magnetic domain wall and to calculate the number of rotations or a rotation angle of the magnetic field generation source.


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    Title :

    MAGNETIC FIELD DETECTION APPARATUS, ROTATION DETECTION APPARATUS, AND ELECTRIC POWER STEERING SYSTEM


    Contributors:

    Publication date :

    2021-09-16


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    H02K Dynamoelektrische Maschinen , DYNAMO-ELECTRIC MACHINES / B62D MOTOR VEHICLES , Motorfahrzeuge / G01B MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS , Messen der Länge, der Dicke oder ähnlicher linearer Abmessungen / G01D MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE , Anzeigen oder Aufzeichnen in Verbindung mit Messen allgemein / H10N






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