| 摘要 |
PURPOSE:To allow a current to follow up a current reference up to high frequency with fidelity by controlling an inverter based on the vector length and phase angle of the instantaneous value of a load current and the vector length of the induced power of the load. CONSTITUTION:A current which is supplied from an inverter 13 to an induction motor 15 is detected by current transformers 27-29 and a current detector 30, is converted via 3-phase/3-phase converter 31, and the vector length and phase angle are detected by a vector detector 32. A phase difference detector 34 detects the phase difference between the actual vector and the reference vector from a two-phase sinusoidal function generator 35. An adder 22 adds the output of a controller 23 which represents the deviation of the current vector length and the output of a multiplier 21 as a vector length command of the output voltage of the inverter 13 is applied to a PWM controller 24. Further, an adder 25 adds the output of a controller 26 which represents the current phase difference and the output of a setter 37, and applies it as the phase command value of the output voltage of the inverter 13 to the PWM controller 24. |
