Title:
DEMAGNETIZATION DIAGNOSIS DEVICE FOR MOTOR AND DEMAGNETIZATION DIAGNOSIS METHOD FOR MOTOR CONTROL DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/117303
Kind Code:
A1
Abstract:
A pulse voltage generator 7 calculates a corrected pulse voltage application time Ton'. The pulse voltage generator 7 also outputs, for the duration of the corrected pulse voltage application time Ton', a voltage vector closest to a rotor phase γ from among voltage vectors V1 - V12 as a voltage vector command V+*. A current detector 8 detects the three-phase output currents Iu, Iv, Iw of a power converter 3, which are obtained when the first to sixth switching elements of the power converter 3 are turned on and off on the basis of the voltage vector command V+*. A three-phase/two-phase converter 9 converts the three-phase output currents Iu, Iv, Iw to two-phase output currents to output d-axis current Id. When the d-axis current Id after the corrected pulse voltage application time Ton' has elapsed becomes less than or equal to a demagnetization determination threshold value, a demagnetization determiner 10 determines that demagnetization occurs in a permanent magnet of the rotor of a motor 4. This improves the accuracy of a demagnetization diagnosis in a demagnetization diagnosis device for a motor.
Inventors:
FUJIMAGARI HIROMU (JP)
Application Number:
PCT/JP2020/033706
Publication Date:
June 17, 2021
Filing Date:
September 07, 2020
Export Citation:
Assignee:
MEIDENSHA ELECTRIC MFG CO LTD (JP)
International Classes:
H02P29/024; H02P21/14; H02P27/06
Foreign References:
| JP2010239790A | 2010-10-21 | |||
| JP2011254682A | 2011-12-15 | |||
| JP2011200019A | 2011-10-06 | |||
| JP2008043153A | 2008-02-21 | |||
| JPS6158115B2 | 1986-12-10 |
Other References:
See also references of EP 4057501A4
Attorney, Agent or Firm:
KOBAYASHI, Hiromichi et al. (JP)
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