| 摘要 |
PURPOSE:To improve the torque control accuracy of an apparatus by correcting the secondary constant in the operation expression of a slip angular velocity from the estimate of the deviation of a primary flux from a desired value and by practicing the estimated operation of the primary flux so that an integrating element approximates to a first-order lag module. CONSTITUTION:A first-order lag time constant T1 becomes a value independent of a power angular velocity W by a primary flux estimator 10 to enable a quick estimation also in a low frequency region. For example, even when the angular velocity takes the maximum value omegamax, T1=1/omegamax is enough to perform a sufficiently quick estimation. In this case, when a flux operation part starts estimation after setting an initial value to zero, an estimation lag occurs in the first-order lag time constant T1=1/omega. For the purpose of preventing this estimation lag, the initial value of primary fluxes lambda'1alpha, lambda'1beta is obtained from the desired value of primary fluxes lambda1alpha, lambda1beta and this value is used to perform operation. |
