| 摘要 |
PURPOSE:To rapidly and accurately control a regeneration by controlling a power regenerative switch element parallel to a power reactor rectifier on the basis of a voltage detection and a current direction detection to return the regenerative energy to an AC power source. CONSTITUTION:When a motor 6 normally rotates and is not in a regenerative brake state, 3-phase ACs are converted by a power factor 4 to a DC, and further converted by an inverter 5 to 3-phase AC, and supplied to the motor 6. When becoming a regenerative state, switches 21-23 are closed by the outputs of a voltage detector 13 and a direction detector 15, and a control signal is supplied to transistors Q1-Q6. The transistors Q1-Q6 are connected in parallel with power reactor rectifiers D1-D6, and the regenerative energy is returned therethrough to an AC power source. |
