SENSORLESS CONTROLLER OF AC MOTOR AND CONTROL METHOD

Title:

SENSORLESS CONTROLLER OF AC MOTOR AND CONTROL METHOD

Document Type and Number:

WIPO Patent Application WO/2003/084050

Kind Code:

A1

Abstract:

A sensorless controller of an AC motor which is controlled stable over the whole drive range including zero speed and zero output frequency regions. This sensorless controller comprises a high-frequency generator (110) for superposing a high-frequency signal on an estimated magnetic flux axis, a high-frequency component extractor (130) for extracting an error signal at a flux position from the voltage/current sense signal of the same frequency component as the high-frequency signal, a magnetic flux observer (120) for estimating the size and the position of a magnetic flux, a first adaptive adjuster for adaptively adjust the error signal on the high-frequency superposition side, a second adaptive adjuster for adaptively adjust the error signal on the magnetic flux observer side, a mixer (140) for selecting the first adaptive adjuster at an ultralow speed, first and second adaptive adjuster at a low speed, and the second adaptive adjuster at a high speed according to the speed, and a speed estimator (150) for estimating the speed from the mixer output.

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Inventors:

HA JUNG-IK (JP)
IDE KOZO (JP)

Application Number:

PCT/JP2003/003741

Publication Date:

October 09, 2003

Filing Date:

March 26, 2003

Export Citation:

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Assignee:

YASKAWA DENKI SEISAKUSHO KK (JP)
HA JUNG-IK (JP)
IDE KOZO (JP)

International Classes:

H02P6/06; H02P6/08; H02P6/18; H02P6/182; H02P6/28; H02P21/00; H02P21/04; H02P21/06; H02P21/09; H02P21/14; H02P21/18; H02P21/22; H02P21/24; H02P21/26; H02P21/28; H02P21/34; H02P23/03; H02P23/07; H02P23/12; H02P23/14; H02P23/16; H02P27/04; H02P29/00; (IPC1-7): H02P21/00

Foreign References:

JP2002051580A	2002-02-15
JP2000350489A	2000-12-15
JPH09191698A	1997-07-22

Attorney, Agent or Firm:

Oguri, Shohei (28th Floor ARK Mori Building, 12-32, Akasaka 1-chom, Minato-ku Tokyo, JP)

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