| 摘要 |
PURPOSE:To reduce calculating steps of necessary data by calculating the output of a speed system obtained by compensating the deviation between a rotary speed instruction value and actual rotary speed data for the instruction value representing the torque current as slip angular frequency data. CONSTITUTION:A frequency command fref inputted from a frequency command input 1 is supplied to a subtractor 2 to obtain a deviation from the actual rotating frequency signal fM inputted from an actual rotating frequency input 16. This deviation is compensated for PI by a speed detecting system 3, which outputs data WS representing the slip angle frequency. On the other hand, the signal fM is supplied to a magnetic flux command generator 6, which generates a magnetic flux command phi*. The command phi* is processed by a subtractor 7, a magnetic flux control system 8 and a magnetic flux calculator 9 to obtain data Im representing the exciting current and data phi representing the secondary magnetic flux. The signal WS is multiplied by K3 times by an amplifier 5, and multiplied by a multiplier 20 by data phi to produce as data I2 representing the torque current component. An induction motor is controlled by vector via data I2, Im, thereby reducing the calculating steps. |
