| 摘要 |
PURPOSE:To obtain a motor having no torque variation by employing a rotor magnet having the sine-wave distribution of magnetic fluxes, vertically summing the outputs of two Hall elements 6 and 7 whose electrical angles are separated by 90 deg., and supplying the resultant outputs to stator coils. CONSTITUTION:Two Hall elements 6 and 7 whose electrical angles are separated by 90 deg. send out the outputs of since-wave signals by the rotation of a rotor magnet having the sine-wave distribution of magnetic fluxes. The output of said Hall element 6 is supplied to an amplifier 19, from which the output SA is supplied to one end of a stator coil 4. The output of the Hall element 7 is supplied to an amplifier 21, from which the output SB is supplied to one end of a stator coil 5. The output SA is supplied to the connecting point of the stator coils 4 and 5 via an inversion amplifier 20. Therefore, the resultant vector 29 of the outputs SA and SB is supplied to the stator coil 4, and resultant vector 30 of the inverted output SA and output SB is supplied to a stator coil 5, thereby the driving voltage separated by 90 deg. of an electrical angle can be obtained. |
