| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem of an induction motor driving gear, which does not smoothly start as the start is controlled by using the arithmetic results obtained with parameters of low accuracy secondary magnetic flux and the like, and that in the worst case, does not start due to the generation of negative torque. SOLUTION: A slip angle frequency arithmetic value from a slip angle frequency arithmetic device 21 and a motor angle frequency detected in a motor angular speed detector 59 are added (first adding means). A primary frequency arithmetic device 12 arithmetically outputs a frequency arithmetic value based on an output detection signal of an inverter 3. In the transition period from a start mode to an ordinary mode judged in a simulator 14, after performing an output (control means 50) by continuously changing the frequency arithmetic value from the primary frequency arithmetic device 12, the output is added (second adding means) with an adding output of the first adding means, by producing a primary angular frequency ω1* for start compensation, a positive slip angle frequency is obtained, smooth start compensation can be performed. |
