Patent ID: 8829831
Filing Date: 2014-09-09
Classification: H02P

Abstract:
1. A parameter estimating apparatus for permanent magnet synchronous motor driving system, the apparatus including a current command generating unit generating a current command on a synchronous reference frame from a torque command, a current controller generating a voltage on the synchronous reference frame using a rotor position of a PMSM (Permanent Magnet Synchronous Machine) from the current command, a first coordinate converter converting an output of the current controller on the synchronous reference frame to an output on stationary reference frame, an over-modulator limiting the output of the first coordinate converter to within a predetermined range and outputting the limited output, an inverter unit applying a voltage command tracing the command torque to the PMSM, and a second coordinate converter converting a phase current outputted from the inverter unit on the stationary reference frame to a phase current on the synchronous reference frame, the apparatus comprising: a first estimating unit estimating a d-axis magnetic flux and a q-axis magnetic flux on a synchronous reference frame, using the output voltage of the over-modulator, the phase current from the second coordinate converter, and the rotor position; a second estimating unit estimating a q-axis inductance on the synchronous reference frame using the q-axis magnetic flux from the first estimating unit; and a third estimating unit estimating a d-axis inductance on the synchronous reference frame using the d-axis magnetic flux from the first estimating unit, wherein a current command is generated, using, by the current command generating unit, the q-axis inductance and d-axis inductance from the second and third estimating units.