Title:
ELECTRIC MOTOR POLE POSITION SENSING METHOD, POLE POSITION SENSING APPARATUS, AND ELECTRIC MOTOR CONTROL APPARATUS USING THE SAME
Document Type and Number:
WIPO Patent Application WO/2003/015256
Kind Code:
A1
Abstract:
It is possible to provide a method capable of easily and reliably sense a magnetic pole position by using inverter output higher harmonic and high−frequency current such as a carrier frequency component. A voltage type PWM inverter causes means (6) for providing an arbitrary phase difference between UV, VW, and WU to generate an arbitrary high frequency other than the output frequency of an inverter (7) in motor input voltage or current and convert it into a two−phase still coordinate system having an &agr −axis which is the U phase of the motor and a β−axis orthogonally intersecting the &agr −axis. Current of an arbitrary high−frequency component is sensed along the &agr −axis and the β−axis. Furthermore, the two−phase still coordinate system is phase−moved by 45 degrees to a coordinate system where the &agr −axis is moved by 45 degrees to &agr ’−axis and a β’−axis orthogonally intersects the &agr ’−axis. The &agr ’−axis and the β’−axis define another two−phase still coordinate system and sense current of an arbitrary high−frequency component. The magnetic pole position of the electric motor is sensed (12) by using the high−frequency current components sensed by the four axes.
Inventors:
WOGARI MENGESHA MAMO (JP)
IDE KOZO (JP)
SAWAMURA MITUJIRO (JP)
IDE KOZO (JP)
SAWAMURA MITUJIRO (JP)
Application Number:
PCT/JP2002/007979
Publication Date:
February 20, 2003
Filing Date:
August 05, 2002
Export Citation:
Assignee:
YASKAWA DENKI SEISAKUSHO KK (JP)
WOGARI MENGESHA MAMO (JP)
IDE KOZO (JP)
SAWAMURA MITUJIRO (JP)
WOGARI MENGESHA MAMO (JP)
IDE KOZO (JP)
SAWAMURA MITUJIRO (JP)
International Classes:
H02P6/16; H02P6/06; H02P6/08; H02P6/17; H02P6/28; H02P21/00; H02P21/18; H02P21/22; H02P21/24; H02P23/16; H02P23/18; H02P27/04; H02P27/08; (IPC1-7): H02P6/18
Foreign References:
| JP2002320398A | 2002-10-31 | |||
| JP2002171798A | 2002-06-14 |
Other References:
See also references of EP 1432112A4
Attorney, Agent or Firm:
Oguri, Shohei (28th Floor ARK Mori Building, 12-32, Akasaka 1-chom, Minato-ku Tokyo, JP)
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