| 摘要 |
PURPOSE:To contrive starting not to be performed in a non-controlled state at the time of re-start after DC damping by finding difference component between a rotor position angle at the time of the re-start and a rotor position angle at the time of the DC clamping, and by using a rotor position angle to be obtained with the deduction of the difference component from the rotor position angle at the time of the restart, as the signal of the rotor position angle at the time of the re-start. CONSTITUTION:A rotor position correcting circuit 21 is provided with a means for finding difference component between a rotor position angle at the time of re-start and a rotor position angle at the time of DC damping, and a means for deducting said component from the rotor position angle at the time of the restart. On timing for the rotor position angle to come to THETAr, DC damping command is generated, and the rotor position angle is moved by THETAp, and is stopped. At the time of the re-start, the rotor position angle is actually moved by THETAp, and is stopped but is processed to be regarded as being stopped at THETAr on control. As a result, at the time of the re-start, a noncontrolled state is not set, and the control can be performed according to speed reference, and if the speed reference is set to be zero for example, the re-start from a zero speed state can be performed. |
