| 摘要 |
PURPOSE:To enable a huller or the like with required three-phase alternating current, to be driven by use of a single phase power source, by obtaining the three-phase alternating current with the rectification and power inversion of a domestic single phase power source. CONSTITUTION:By a rectification circuit 1, domestic single phase alternating current is rectified. By a smoothing circuit 2, the output of the rectification circuit 1 is smoothed. By a power inverter circuit 3, the output of the smoothing circuit 2 is converted to three-phase alternating current. After signal from a control circuit 62 is pulse-shaped by a waveform shaping circuit 61, the signal enters a base drive circuit 7. The power inverter circuit 3 is conduction- controlled so that the three-phase alternating current may be produce in order by the output of the base drive circuit 7. By the U, V and W of the output of the power inverter circuit 3, an AC motor 8 is driven, and the speed of rotation is controlled by the frequency of the three-phase alternating current. |
