| 摘要 |
<P>PROBLEM TO BE SOLVED: To determine the position of a rotor of a permanent magnet motor. <P>SOLUTION: A rotor position estimating device 42 of the permanent magnet motor having a stator and a rotor is provided with a circuit 58 for generating negative sequence stationary currents (NSSC) of a d-axis and a q-axis. A signal adjusting circuit 64 combines the NSSC signal with first and second feedback signals based on a rotor position estimating signal. A mechanical system simulator 70 connected to the output of the circuit 64 via a regulator 66 generates a rotor position estimating signal θ<SB>r</SB>on the basis of an instruction torque T<SB>e</SB>signal. The circuit 64 is provided with a second harmonic amplifier 74 for receiving the signal θ<SB>r</SB>to output the first feedback signal, and an opposite saliency model 90 for receiving the signal θ<SB>r</SB>to output the second feedback signal. <P>COPYRIGHT: (C)2003,JPO |
