| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a sensorless controller of a synchronous motor which generates no rotation angle estimation error due to deviation of high-frequency current caused by the restriction of output voltage vector of an inverter. <P>SOLUTION: A high-frequency voltage observing means 8 observes high-frequency voltage in output voltage resulting from switching operation of an inverter 4 from a rotating coordinate system synchronizing with the rotation of a synchronous motor 6. A current obtaining means 9 observes high-frequency current generated corresponding to the high-frequency voltage from the rotating coordinate system. An approximation operating means 10 operates an inductance matrix in the rotating coordinate system of the synchronous motor 6 by approximation operation using a plurality of sets of the high-frequency voltage value and the high-frequency current value. A rotation phase angle estimating means extracts a feature quantity proportional to a rotation phase angle estimation error from the inductance matrix and estimates the rotation phase angle by controlling so that the feature quantity converges on the predetermined target value. <P>COPYRIGHT: (C)2009,JPO&INPIT |
