| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problem that it is difficult to appropriately estimate a rotation angle of a motor 10 in the middle of rotation at the time of starting an operation from an operation stop state of an inverter 34. <P>SOLUTION: Actual currents iu, iv and iw of the motor 10 are converted into current components on αβ-axes in a two-phase converting part 12 and then converted into current components on dq-axes in a dq converting part 14. The actual currents id and iq which are thus converted are fed back to command currents idc and iqc at usual time. At the time of starting the operation from the operation stop state of the inverter 34, the rotation angle θ used in the dq converting part 14 and an αβ converting part 28 is set to zero. Thus, voltage is applied so that real current on the αβ-axes is fed back to a command value. At that time, an extended induced voltage observer 40 starts estimation of the rotation angle based on command voltages vαc and vβc and actual currents iα and iβ. <P>COPYRIGHT: (C)2009,JPO&INPIT |
