| 摘要 |
PURPOSE:To perform accelerating or decelerating operation of a motor within the shortest time by the effective use of torque of an inverter, by working out the accelerating or decelerating time and fluctuating frequency in accordance with the characteristic of motor and load. CONSTITUTION:A frequency command means 20 is composed of an output frequency decision circuit 21, a setter of moment of inertia 22, and a load torque setter 23 to set the load torque TL of a load 6. The output frequency decision circuit 21 is composed of an output frequency setter 24 to input acceleration and deceleration time data t and fluctuate the unit frequency f0, an output torque characteristic storage cell 25 where the characteristic of the output torque T is stored against the drive frequency f, and a shortest acceleration- deceleration time calculator 26 to calculate the shortest acceleration and deceleration time. Thus, the shortest time to fluctuate the unit frequency in each instant or the maximum fluctuating frequency fluctuating in a unit time is worked out and the command frequency is fluctuated accordingly. |
