Patent ID: 7733044
Filing Date: 2010-06-08
Classification: B60L,H02P,Y02T

Abstract:
1. An IPM (Interior Permanent Magnet) motor system comprising: an IPM motor comprising a stator having slots and a rotor having poles; a control unit configured to control said IPM motor, said control unit estimates an initial position of said rotor to said stator in an angle estimation read precision, and said angle estimation read precision is equal to an angle unit precision of 360°/2 m, where m is the number of said slots in said stator; and a bearing sensor provided for a rotation axis which is connected with said rotor to detect a movement quantity from said initial position of said rotor to said stator; wherein said control unit comprises: a calculating section configured to output a number of rotations of said IPM motor and a measured phase angle from an output from said bearing sensor; a current command generating section configured to generate a d-axis current command and a q-axis current command based on the number of rotations and a torque command; a measuring section configured to generate a measured d-axis current and a measured q-axis current from a 3-phase motor current of said IPM motor; a voltage command generating section configured to generate a 2-phase voltage command from said d-axis current command, said q-axis current command, said measured d-axis current and said measured q-axis current; a command converting section configured to generate a 3-phase voltage command from a post correction phase angle and said 2-phase voltage command; a driving section configured to drive said IPM motor based on said 3-voltage command; and a correcting section configured to generate said post-correction phase angle from said measured phase angle, said d-axis current command, said q-axis current command, said measured d-axis current and said measured q-axis current.