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Title:
DRIVE UNIT OF SYNCHRONOUS MOTOR
Document Type and Number:
Japanese Patent JP2014217191
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a drive system of a synchronous motor which allows for stable driving from a very low speed area near zero speed by adjusting the individual difference of each motor, in phase estimation means used for phase estimation by detecting a variation in the neutral point potential, caused by unbalance in the three-phase inductance of a three-phase synchronous motor.SOLUTION: A drive system of a three-phase synchronous motor includes two phase estimation means, i.e., a first phase estimation means based on the neutral point potential and second phase estimation means based on the speed induced voltage, and phase correction means for storing the phase difference between two phase estimation means in a high speed area, and correcting the output from the first phase estimation means in low speed area by using the phase difference thus stored.

Inventors:
HARA TAKAFUMI
IWAJI YOSHITAKA
AOYANAGI SHIGEHISA
Application Number:
JP2013093183
Publication Date:
November 17, 2014
Filing Date:
April 26, 2013
Export Citation:
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Assignee:
HITACHI AUTOMOTIVE SYSTEMS LTD
International Classes:
H02P6/18; H02P6/06; H02P6/08; H02P6/17; H02P6/182; H02P6/28; H02P27/08
Domestic Patent References:
JP2000152687A2000-05-30
JP2012105515A2012-05-31
JP2010074898A2010-04-02
JPH10174499A1998-06-26
Foreign References:
WO2012157039A12012-11-22
Attorney, Agent or Firm:
Manabu Inoue
Yuji Toda
Shigemi Iwasaki