| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a speed sensorless vector control device that can be adapted to a tension control system that requires torque control and also can be used as a lift. <P>SOLUTION: A magnetic flux/speed/slide estimator 15 is constituted of an observer, and operates a magnetic flux value Φ^, a speed estimation value ω^ and a slide estimation value ωs1^, on the basis of a q-axis voltage V1q* output from a q-axis current controller 4, a d-axis voltage V1q* output from a d-axis current controller 9, a torque current value I1q^ output from a coordinate converter 14, and an exciting current value I1d^. A switching device 18 comprises an input part that inputs a zero-speed signal from an information source that can detect the zero speed of an induction motor 13, and outputs the speed estimation value ω^ operated by the magnetic flux/speed/slide estimator 15 when the zero-speed signal is not input, and when the zero-speed signal is input, the switching device outputs zero as the speed estimation value. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
