| 摘要 |
PCT No. PCT/JP83/00463 Sec. 371 Date Sep. 12, 1984 Sec. 102(e) Date Sep. 12, 1984 PCT Filed Dec. 28, 1983 PCT Pub. No. WO84/02810 PCT Pub. Date Jul. 19, 1984.The present invention relates to a three-phase brushless motor in which two electromagnetic transducer elements for detecting the rotation position of a rotor having a plurality of magnetized regions are disposed to have a relative positional relation with an electrical angle of 120 DEG or 240 DEG , a composed signal having a phase difference of 120 DEG relative to the output signals from the electromagnetic transducer elements is provided and the drive current to be supplied to the stator coil is determined on the basis of the composed signal and the output signals from the electromagnetic transducer elements. An auxiliary magnetic pole having opposite polarity to that of main magnetic pole is disposed on the rotor at the portions near and opposing to the electromagnetic transducer elements so as to make the waveform of the composed signal of the output signals from the electromagnetic transducers steep at zero-cross points. Thus, the drive currents supplied to the stator coils are made excellent and uneven rotation torque can be improved.
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