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- Publisher
- de Gruyter
- Copyright
- © Polish Academy of Sciences
- ISSN
- 2300-2506
- eISSN
- 2300-2506
- DOI
- 10.1515/aee-2017-0030
- Publisher site
- See Article on Publisher Site
Abstract
AbstractEmergency motor switch-on happens occasionally while operating a doublesquirrel- cage motor at full supply voltage with the rotor blocked (e.g., in coal mills). After releasing the blockage, the by now heated motor is started up again. However, the mechanical stress caused by the increased temperature poses considerable hazards to the squirrel-cage winding. This paper presents a double-cage induction motor model for analysis of thermal fields in transient operation. The thermal field for the rotor of a doublesquirrel- cage motor of soldered or cast structure, operating in the conditions described, has been calculated in the present paper using a thermal network method. Measurement results have been presented for the double-squirrel-cage winding temperature for a soldered cage construction in the blocked rotor state.
Journal
Archives of Electrical Engineering – de Gruyter
Published: Jun 27, 2017