| 摘要 |
PURPOSE:To apply a vector control to a high voltage induction motor by providing correcting means for reducing a control amount of a component which contributes to the generation of a magnetic flux at starting or low speed time of the motor to prevent a transformer from saturating. CONSTITUTION:A magnetic flux reference correcting circuit 17 has a function for outputting a magnetic flux correction signal phi1* to reduce to a magnetic flux reference phi2* decreased from a normal magnetic flux reference phi1* at speed time of the prescribed speed omegar1 or lower. The reference phi* is reduced to phi2* when an induction motor 4 is started to prevent a transformer 20 from saturating. Thus, a vector control can be applied to the motor while preventing the transformer 20 from saturating. |
