Title: Field weakening vector controller for permanent magnet synchronous motor and module
Application Number: 200610132003 Application Date: 2006.10.19
Publication Number: 1956317 Publication Date: 2007.05.02
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H02P21/00;H02P6/08;H02P27/04
Applicant(s) Name: Hitachi Ltd. Address:
Inventor(s) Name: Tobari Kazuaki;Maeda Daisuke;Endo Tsunehiro
Attorney & Agent: qurui
Abstract:
    a field weakening vector controller for the permanent magnet synchronous motor which accomplishes a high-precision, high-response, and high-stability motor torque control even in a field weakening region and which is applicable both to an inexpensive current detecting system and to a system without a pole position detector is provided. A stable motor control characteristics can be accomplished by correcting a q-axis current command value by a product of a d-axis current command value (or a detected current value) calculated by field weakening control and a sine signal which is a phase difference between the reference axis of control and the reference axis of the motor.
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