| 摘要 |
PURPOSE:To perform an operation equivalent to an integration by approximating an integrating factor to a primary delay factor, varying the time constant of a primary delay corresponding to a power source frequency to control a gain and a phase delay and correcting the gain and the phase delay. CONSTITUTION:An integrating factor is approximated to a primary delay factor. When the time constant T1 of a primary delay is controlled to 1/omega, an output obtained by a secondary magnetic flux presuming unit 10 is multiplied by 2<1/2>, and its phase delay is calculated to be deviated by -45 deg. for correction. Then, it becomes the same as an integrator. The secondary magnetic flux lambda2beta obtained by a secondary magnetic flux presuming unit 10 is inputted to a secondary resistance change calculator 11 to obtain a secondary resistance change K, which is then inputted to a slip angle speed calculator 5, which corrects the set value of the secondary resistance with the change K to obtain a slip angle omegas. Thus, generated torque change due to the secondary resistance change can be compensated to improve torque control accuracy. |
