| 摘要 |
PURPOSE:To enhance accuracy in torque control by compensating for the fluctuation of exciting inductance over the entire operating range. CONSTITUTION:Speed of an IM is detected at a speed detecting section 43 which then outputs a target value corresponding to a detected angular frequency omegar. The target value is fed to a first coordinate converting section 51 which then delivers an ideal value and the like. These values are fed through an ideal voltage operating section 52 to a polar coordinates converting section 9. The polar coordinate converting section 9 is provided with outputs from a secondary resistance variation operating section 10 and a slip angular frequency operating section 11. Current flowing into the IM is detected through a second coordinates converting section 6. The detected value is then compared with a target value and the difference is fed through PI amplifiers 7, 8 to an identifying circuit section 12. The identifying circuit section 12 delivers exciting inductance conversion data, operated based on various data, to a data section 77 which then controls the slip angular frequency operating section 11 and the like. |
