| 摘要 |
PURPOSE:To prevent a circuit configuration from becoming complicated by supplying a reactive current to current detecting means, and suppressing a peak of a composite torque by reduction in a torque due to the reactive current. CONSTITUTION:A reactive current is supplied to a current detection resistor 14. The current is obtained by simultaneously conducting positive and negative side switching element groups 13a, 13b for a predetermined conducting zone, i.e., a timing range. The reactive current is made to flow through a current detection resistor 14, and parts of currents flowing to driving coils Lu, Lv, Lw are cut to reduce a torque ripple without influence of the accuracy of position detecting means such as Hall elements 11u, 11v, 11w, etc., without a special circuit configuration. |
