| 摘要 |
PURPOSE:To manufacture a motor having less torque ripple by flowing driving currents having approximately equal phase to the crossing magnetic flux of two-phase exciting coils in accordance with the sum and difference signals of the outputs from magnetoelectric transducers elements. CONSTITUTION:Coils 2, 2' and 3, 3' of A and B phase are disposed in the phase difference of pi/2.3 of electrical angle. A Hall element H1 is disposed at the position of pi/4.5 from one end of the coil 2, a Hall element H2 is disposed at the position of pi/4.5 from one end of the coil 3', and the phase difference of the Hall elements H1 and H2 is pi/2.3. Differential amplifiers 6, 7 supply the different and sum signals of the outputs from the Hall elements H1, H2 through power amplifiers 8, 9 to the coils 3, 2, respectively. Since the driving currents having equal phase to the crossing magnetic flux of the coils are thus flowed, a synthesized rotating torque can be obtained without torque ripple. |
