| 摘要 |
PURPOSE: A magnetizing yoke of a DC motor is provided to reduce a magnetizing time by simultaneously magnetizing a permanent magnet for a rotor and a permanent magnet for sensing. CONSTITUTION: The first yoke coil(51) and the second yoke coil(55) are connected in series or in parallel in order to simultaneously magnetize a permanent magnet(11) for a rotor and a permanent magnet(15) for sensing. When the first and the second yoke coils(51,55) are connected in series, since the first and the second yoke coils(51,55) are different in impedance(Z1,Z2), a voltage applied between both the coils should be increased as much as addition of impedance of the second yoke coil(55) so as to obtain a magnetic field necessary for magnetizing the permanent magnet(11) for the rotor, compared with the conventional method. If a magnetizer having the same capacity as a magnetizer used during a separate magnetizing is to be used, the number of coil turned and thickness of the coil should be properly adjusted to make an impedance applied to a magnetizing yoke of the permanent magnet(11) for the rotor equal to a total impedance.
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