METHOD FOR CALCULATING MOTOR CONSTANT OF PERMANENT MAGNET SYNCHRONOUS ELECTRIC MOTOR AND MOTOR CONSTANT COMPUTATION DEVICE

WIPO Patent Application WO/2013/018349

A1

This method for computing a motor constant of a permanent magnet synchronous electric motor includes: a voltage application step in which an application voltage, in which a DC component and an AC component are combined, is applied to the permanent magnet synchronous electric motor after the frequency of the AC component is changed; a current detection step in which a motor current that flows in accordance with the applied voltage is detected; a phase difference computation step in which a phase difference between the AC component of the applied voltage and the AC component of the motor current is computed; and a motor constant computation step in which a motor constant of the permanent magnet synchronous electric motor is computed. In the motor constant computation step, the motor constant is computed on the basis of an applied voltage and a motor current that yield a phase difference close to 45 degrees.

JP5531428	Power-saving drive devices and methods for devices with the same load pattern
JP2011114995	DRIVE CIRCUIT FOR MOTOR AND MOTOR EQUIPPED WITH THE SAME

TAZAWA TORU
NISHIZONO MASARU

PCT/JP2012/004822

February 07, 2013

July 30, 2012

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PANASONIC CORP (JP)
TAZAWA TORU
NISHIZONO MASARU

H02P27/06

JP2011193563A	2011-09-29
JPH0634724A	1994-02-10
JPH10225200A	1998-08-21
JP2006174524A	2006-06-29
JP2004072821A	2004-03-04
JP2000312498A	2000-11-07
JP2009232573A	2009-10-08

See also references of EP 2741416A4

NAITO, Hiroki et al. (JP)
Hiroki Naito (JP)

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