Title:
STATE DETERMINATION DEVICE, MOTOR DRIVE SYSTEM, FREEZING SYSTEM, FAN SYSTEM, AND STATE DETERMINATION METHOD
Document Type and Number:
WIPO Patent Application WO/2023/176873
Kind Code:
A1
Abstract:
A control unit (31) determines, on the basis of a first frequency component (C1) of a signal based on an electric current or a voltage of a motor (50), whether or not the motor (50) or a device (70) is in a specific state. When the signal is a DC signal, the frequency of the first frequency component (C1) is that of a specific frequency component (Cs) that is less than 1 time the mechanical angle frequency (fm) of the motor (50). When the signal is an AC signal, the frequency of the first frequency component (C1) is obtained by subtracting the frequency of the specific frequency component (Cs) from a fundamental frequency (f0) of the signal, or by adding the frequency of the specific frequency component (Cs) to the fundamental frequency (f0) of the signal.
Inventors:
OKAMOTO HIDEYUKI (JP)
DOI AKIHIRO (JP)
ARAKI TAKESHI (JP)
DOI AKIHIRO (JP)
ARAKI TAKESHI (JP)
Application Number:
PCT/JP2023/010040
Publication Date:
September 21, 2023
Filing Date:
March 15, 2023
Export Citation:
Assignee:
DAIKIN IND LTD (JP)
International Classes:
H02P29/024
Domestic Patent References:
| WO2019082277A1 | 2019-05-02 |
Attorney, Agent or Firm:
MAEDA & PARTNERS (JP)
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