| 摘要 |
PURPOSE:To simplify a controller of an induction motor by controlling ON and OFF an inverter so as to become the current value added by or subtracted by the prescribed value to or from a sinusoidal reference current, thereby eliminating the suppression control of the correcting control of switching frequency. CONSTITUTION:A reference sinusoidal wave oscillator 16 receives a clock pulse from a reference clock oscillator 18 and a set current value Ir, and outputs a reference current A of the output frequency (f) of an inverter in frequency and set current value Ir of width. A comparator 15 receives the current A, compares the load current D of the AC output side of the inverter outputted from a load current detector 14 with the reference upper and lower limit currents B, C added with and subtracted from allowable width command value Ih to control ON and OFF a switching element of the inverter circuit. |
