| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a sensorless control method and its apparatus for reducing a vibration generated in a low speed region, independent of a control axis in intermediate and high speed regions, and continuously controlling an AC electric motor with the high control accuracy from zero speed to the high speed region during a rapid change in a load and a rapid acceleration/deceleration operation. <P>SOLUTION: The sensorless control method for continuously controlling the AC electric motor 9 from the zero speed to the high speed region, uses a speed estimate ωest and a position estimate θest estimated by a position/speed estimator 15 using a mechanical mathematical formula model, and controls so as to obtain a position error Δθ from an outer product operation of a first magnetic flux vector operated using a rotor angle and a second magnetic flux vector operated without using the rotor angle and make the position error Δθ zero. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
