Abstract: The rotation sensing device comprises a magnet, magnetic sensors, and yokes, which are secured to the base and control the magnetic flux of the magnetic field formed by the magnet; each magnetic sensor comprises a magnetic wire, a coil, and a bobbin; each yoke comprises a left yoke piece and a right yoke piece partially covering the left portion and the right portion of the magnetic sensor; the left yoke piece has a left front plate portion, the left front plate portion, which extends linearly from the front of the left portion of the bobbin, which is to the left of the section where the coil is provided, all the way to the front of the coil, and is inclined with respect to the direction of extension of the magnetic wire such that the right end thereof is located rearwardly of left end thereof.

Abstract: The magnetic sensing portion 30 of the rotation sensing device comprises three magnetic sensors 31-33 and a substrate 45 for mounting these magnetic sensors, with each magnetic sensor comprising a magnetic wire 34 generating large Barkhausen effects, a coil 35, and a bobbin 36. The magnetic sensors are disposed on the substrate 45 such that the directions of extension of the magnetic wires 34 are parallel to the substrate 45, the magnetic sensing portion 30 is disposed on the outer periphery of the trackway of the magnetic field forming portions such that the directions of extension of the magnetic wires 34 are parallel to the axial direction of the rotary shaft 3, and the location of the magnetic wire installation portion 38 in the bobbin 36 of each magnetic sensor is configured such that the respective magnetic wires 34 of the three magnetic sensors are respectively equidistant from the rotary shaft 3.

Abstract: The rotation sensing device comprises a magnet, magnetic sensors, and yokes, which are secured to the base and control the magnetic flux of the magnetic field formed by the magnet; each magnetic sensor comprises a magnetic wire, a coil, and a bobbin; each yoke comprises a left yoke piece and a right yoke piece partially covering the left portion and the right portion of the magnetic sensor; the left yoke piece has a left front plate portion, the left front plate portion, which extends linearly from the front of the left portion of the bobbin, which is to the left of the section where the coil is provided, all the way to the front of the coil, and is inclined with respect to the direction of extension of the magnetic wire such that the right end thereof is located rearwardly of left end thereof.

Abstract: The magnetic sensing portion 30 of the rotation sensing device comprises three magnetic sensors 31-33 and a substrate 45 for mounting these magnetic sensors, with each magnetic sensor comprising a magnetic wire 34 generating large Barkhausen effects, a coil 35, and a bobbin 36. The magnetic sensors are disposed on the substrate 45 such that the directions of extension of the magnetic wires 34 are parallel to the substrate 45, the magnetic sensing portion 30 is disposed on the outer periphery of the trackway of the magnetic field forming portions such that the directions of extension of the magnetic wires 34 are parallel to the axial direction of the rotary shaft 3, and the location of the magnetic wire installation portion 38 in the bobbin 36 of each magnetic sensor is configured such that the respective magnetic wires 34 of the three magnetic sensors are respectively equidistant from the rotary shaft 3.