| 摘要 |
PURPOSE:To reduce the generation of continuous current on a push-pull- connected driving circuit, by suppressing the transfer of phase switching signal at the time of feeding forward/reverse rotation switching signal. CONSTITUTION:By a logical circuit 5, the output current Ia, Ib of hole amplifiers 2-4 is put together, to generate the output of phase switching signals U-W. By driving circuits 6-8, according to the change of the level of the phase switching signals U-W, the phase switching of driving current I1-I6 fed to motor coils L1-L3 is performed. By a forward/reverse rotation switching circuit 9, according to the change of the level of forward/reverse rotation switching signal Va, the phase of the phase switching signals U-W is reversed, and the rotational direction of a motor is reversed. By a detecting circuit 21, the transfer of the phase switching signals U-W is suppressed when the change of the level of the forward/reverse rotation switching signal Va is detected. As a result, the continuous current of the driving circuits 6-8 is reduced. |
