| 摘要 |
PROBLEM TO BE SOLVED: To provide a sensor-less vector controller, in which a complicated arithmetic operation need not be executed and a voltage detector need not be installed. SOLUTION: A time constant T2 regarding a rotor for an induction motor 3 is stored in a slip-frequency arithmetic circuit 8, and slip frequency ωs is arithmetically operated by using a flux-current detecting value iM and a torque- current detecting value iT from a static/rotational coordinate conversion circuit 9 and the time constant T2 . An inverter output-frequency command value ω1 * obtained by adding a rotor-speed command value ωr * and slip frequency ωs is input to a counterelectromotive-force arithmetic circuit 4, and a counterelectromotive-force command E* is output. A voltage-command arithmetic circuit 5 outputs voltage command values vM* and vT* on the basis of E* and stator resistance R1 . A rotational/static coordinate conversion circuit 6 outputs a voltage command value v1 * to a voltage type inverter device 2 on the basis of vM* and vT*. |
