| 摘要 |
PURPOSE:To improve the economy by dividing a pattern signal for simulating to a sinusoidal wave at every prescribed electric angle and memorizing them, thereby minimizing the capacity of a memory cell. CONSTITUTION:The electric angle 90 deg. of a sinusoidal wave is divided into six so that 15 deg.min is as unit waveform, and these unit waveforms are memorized in an ROM13. A rate multiplier 14 applies a clock signal for selecting the unit waveform corresponding to the output voltage having the prescribed ratio relation to the output frequency of an inverter main circuit to an up-down counter 15. The unit waveform read out from the ROM13 is selected by a data selector 18U, and outputs of 3-phase 360 deg. are led out. |
