| 摘要 |
<P>PROBLEM TO BE SOLVED: To increase a rotor position detecting accuracy by identifying machine constants when a rotor position of a motor is detected from detected values of voltage and current and the machine constants of the motor without using a rotary encoder or the like. <P>SOLUTION: An error reducing portion 19 has a value which a torque variation volume of a compressor 6 has set in advance and outputs a Lq correction command by comparing a torque variation volume output brought from an amplification adjusting portion 15 with the set value. A position detecting portion 12' corrects the Lq by responding to the Lq correction command, and outputs the rotor position and an angular velocity by using the Lq after the correction. As the torque variation volume of the compressor 6 is almost determined by a structure of the compressor 6, the Lq correction command is outputted by comparing the torque variation volume possessed by the compressor 6 with a value of torque variation outputted by a control, and the correction of the Lq in the position detecting portion 12' is actualized. <P>COPYRIGHT: (C)2009,JPO&INPIT |
