Abstract: A magnetic detector of the present invention employs magneto-resistive elements and detects magnetic teeth of an object to be detected, and more particularly, a constant DC magnetic field is supplied to the magneto-resistive elements in such a way so as to avoid a non-linear region of the DC magnetic field to permit the use of such elements in the region exhibiting good linearity. The present invention provides the DC magnetic field to the magneto-resistive elements by employing a simple structure wherein the magneto-resistive elements are arranged inclined relative to the magnetic field defined between a permanent magnet and the magnetic teeth. Furthermore, the magneto-resistive elements having two phases delayed by .pi./2 are used in a half-bridge so as to improve the stability, waveform distortion, etc. with respect to the temperature of the detected signal.

Abstract: A linear motor comprising; a pair of iron cores with plural magnetic teeth groups in which phase is shifted 180 degrees in the direction of its movement, a movable element in which groups of magnetic teeth on the same iron core have the same phases, plural rows of magnetic teeth positioned crossing the direction of the movable element's movement at right angles and a fixed element in which mutual phase is shifted as much as n/m.multidot.P (m is the number of phases of the linear motor, n is an integer where m>n and P is the pitch of magnetic teeth).