Title:
電動機の診断装置
Document Type and Number:
Japanese Patent JP6945728
Kind Code:
B2
Abstract:
The electric motor diagnosing device includes a current detection circuit (7) for detecting current of an electric motor (5), and a calculation processing unit (10) which receives output of the current detection circuit (7) and performs determination for winding short-circuit abnormality of the electric motor (5), wherein the calculation processing unit (10) includes a driving state determination unit (41) for determining the driving state of the electric motor (5), and an initial negative-phase-sequence current analysis unit (31) for analyzing initial negative-phase-sequence current in a normal state, and performs determination for winding short-circuit of the electric motor using, as an evaluation value, a difference between negative-phase-sequence current calculated from current of the electric motor during driving and the initial negative-phase-sequence current. Thus, negative-phase-sequence admittance is not calculated and therefore short-circuit failure in stator windings of the electric motor can be detected accurately.
Inventors:
Toshihiko Miyauchi
Makoto Kanamaru
Makoto Kanamaru
Application Number:
JP2020514817A
Publication Date:
October 06, 2021
Filing Date:
April 17, 2018
Export Citation:
Assignee:
Mitsubishi Electric Corporation
International Classes:
G01R31/34; G01R31/52; H02K11/26; H02K11/27
Domestic Patent References:
| JP2012186973A | ||||
| JP504857B1 |
Foreign References:
| WO2017081908A1 |
Attorney, Agent or Firm:
Patent Business Corporation Parumo Patent Office