| 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 F 2 RB 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.
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