| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a sensorless controller of a synchronous electric motor, with which a stable operation is realized with simple adjustment and an operation amount is not extremely increased. <P>SOLUTION: A PWM modulating means 7 modulates an input three-phase voltage command based on a PWM system and outputs gate signals to respective phase switching elements of an inverter 4. A high-frequency component operating means 8 operates a high-frequency component of the current generated by voltage decided in the PWM modulating means 7 and output from the inverter 4 at every switching of the inverter 4. An index operating means 9 operates a value proportional to a rotation phase angle estimation error from the high-frequency component of the current in a γδ coordinate system rotating in synchronizing with the rotation of the synchronous electric motor 6 as an index R. A rotation phase angle estimating means 10 estimates a rotation phase angle by using the index R. <P>COPYRIGHT: (C)2008,JPO&INPIT |
