Diagnostics of Rotor Asymmetries in Inverter-fed, Variable Speed Induction Machines - Brossura

Calvo, Eva Teresa Serna

Brossura

ISBN 10: 3832522530 ISBN 13: 9783832522537

Casa editrice: Logos Verlag Berlin, 2009

Riassunto

Electrical machines spread over production lines in the industry and can cause the shutdown of whole equipments if they collapse. In the past, safe and reliable operation was basically ensured by manufacturers and users of electrical machines with the help of simple protections such as overcurrent and overvoltage devices. Nowadays, many operators use condition based maintenance strategies in parallel with conventional corrective maintenance so that not only reliability and safety are increased, but also economical losses can be reduced. In the case of induction machines, common faults are asymmetries in the squirrel cage as for example broken bars or fractures in the end rings. This type of fault causes a characteristic harmonic in the different variables of the machine that can be used for the purpose of diagnostics. Although several condition monitoring techniques have been proposed for machines supplied from the mains, the issue is still open in the case of inverter fed variable speed induction machines. In this work, the influence of field oriented control in the fault signature of an induction machine with a single broken rotor bar is investigated. A comparison of different indicators based on the Fourier's Series is presented. Besides, several variants of the field oriented control have been addressed, especially the sensorless schemes. This analysis is validated both through simulations and experimental data obtained in a test bench with a faulty squirrel cage induction machine.

Dettagli dell'edizione

• Editore: Logos Verlag Berlin
• Data di pubblicazione: 2009
• Lingua: Inglese
• ISBN 10: 3832522530
• ISBN 13: 9783832522537
• Rilegatura: Copertina flessibile
• Numero di pagine: 110
• Contatto del produttore: non disponibile
• Persona responsabile: non disponibile