PURPOSE: To obtain a precision magnetizer with a simple construction and at a low cost by a method wherein two annular magnetizing yokes are so held as to make the respective salient pole teeth parts gear in each other to form an annular protruded pole teeth part and conductors are applied to the circumference of the annular salient pole teeth part.

CONSTITUTION: The inside circumferential portions of annular yokes 20 and 21 composed of two independent magnetic units are so formed as to have thin thicknesses and multipole teeth parts 22 and 23 which have fine pitches and are protruded toward one of the axial directions so as to face each other are extended and formed to form annular magnetizing yokes 24 and 25. The magnetizing yokes 24 and 25 are so held as to make their respective salient pole teeth parts 22 and 23 gear in each other with a fine gap 26 along the axial direction so as to make the salient pole teeth parts 22 and 23 alternately arranged circularly. With this constitution, a conductor winding space 27 to which suitable number of turns of conductors 28 can be applied is formed around the salient pole teeth parts 22 and 23 by the yokes 20 and 21 of the magnetizing yokes 24 and 25.