| 摘要 |
Provided is a vector control apparatus for an induction motor which is capable of obtaining stable rotation in a short period of time for adjustment even at the time of low-speed operation by increasing the SN ratio of an output voltage to suppress the arithmetic error in the primary angular frequency arithmetic value based on a magnetic flux command value calculated from a circuit constant and an actual measurement of the induction motor even in the case where the rotation velocity of the induction motor is lower. The vector control apparatus includes: magnetic flux command value arithmetic means (11) for selecting and outputting the magnetic flux command value on the basis of a torque command value Tmr that is input from the external, the circuit constant of the induction motor, and the actual measurement related to the induction motor; and vector control means (10) for controlling the inverter device (3) on the basis of the magnetic flux command value that is output from the magnetic flux command value arithmetic means (11) and the circuit constant of the induction motor (8). The magnetic flux command value arithmetic means (11) includes a magnetic flux command value back calculation arithmetic section (21) for calculating a magnetic flux command arithmetic value F2RB so that a voltage that is applied to the induction motor 8 becomes equal to or higher than a setting value corresponding to an unstable area. |
