| 摘要 |
PROBLEM TO BE SOLVED: To ensure highly accurate torque control, even in the vicinity of a frequency such as highly accurate integration of speed is difficult by detecting the components in the direction of gap magnetic flux and the direction perpendicular thereto and then correcting the direction of gap magnetic flux. SOLUTION: A harmonic voltage detector 10 detects, from a primary voltage v1 detected by a voltage detector 4, a component vh perpendicular to a gap magnetic flux and having a same frequency vh as that fh of a harmonic current outputted from a harmonic current generator 12, using the phase command θg of gap flux. A flux direction corrector 11 time integrates the output from the harmonic voltage detector 10 and operates the product of the time integrated output and the output from a harmonic input switch 16 and then delivers the averaged value thereof to a substractor 13. A substractor 13 subtracts the output of the flux direction corrector 11 from the output of a current command generator 7, i.e., the angular frequency of the gap magnetic flux, for correcting the angular frequency ωg of the gap magnetic flux. A notch filter 15 removes only the frequency fh component of a torque command Tc, before it is delivered to a torque controller 5. |
