| 摘要 |
PURPOSE:To accurately control a motor by providing means for correcting the secondary resistance value by a torque detected value at no variation time of the secondary magnetic flux command to calculate the accurate current command irrespective of the stator side temperature variation. CONSTITUTION:A discriminator 16A judges whether the secondary magnetic flux command varies within the prescribed time or not by monitoring the differentiated value of a differentiator 36, and supplies a discrimination signal to the secondary resistance calculator 16B when the variation does not occur. A detection signal is supplied from a torque sensor 14 to the secondary resistance calculator 16B, and the secondary resistance value R2 is calculated when the discrimination signal is supplied. This value R2 is supplied to the secondary resistance correcting circuit 16C to update to correct the value R2 set to multipliers 40, 44 so far. |
