NDLI: Comparison of Different Tapped Windings for Flux Adjustment in Induction Motors

Content Provider	IEEE Xplore Digital Library
Author	Ferreira, F.J.T.E. Cistelecan, M.V. de Almeida, A.T.
Copyright Year	1986
Abstract	In single-speed three-phase squirrel-cage induction motors with rated power above 3 kW, although the use of electronic soft-starters is increasing fast, the conventional star-delta starters are still the most used, requiring three contactors. In this paper, motor soft starting and/or magnetizing flux adjustment solutions based on two-flux-level, delta- and star-connected, tapped windings are proposed, providing an alternative to the conventional star/delta windings. The motor flux adjustment in the proposed tapped winding is based on the change of the winding factor and/or per-phase number of turns. The connection-mode change system for the proposed tapped windings requires only two contactors, and no extra cost is expected for the motor manufacturing or rewinding. For the proposed tapped winding arrangements, a theoretical analysis is made, and simulated and experimental results are presented. The presented solutions can be used to improve the part-load efficiency and power factor of fixed-speed variable-load motors, particularly if they operate long periods with load lower than 35%-45% and short periods with load close to 100%, and an automatic load-based winding connection-mode management system is used.
Sponsorship	IEEE Power Engineering Society
Starting Page	375
Ending Page	391
Page Count	17
File Size	4905483
File Format	PDF
ISSN	08858969
Volume Number	29
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Windings Coils Induction motors Saturation magnetization Contactors Magnetic flux Torque winding connection-mode change energy savings induction motors MMF analysis motor flux adjustment motor starting power factor improvement star/delta connections three-phase tapped windings
Content Type	Text
Resource Type	Article
Subject	Energy Engineering and Power Technology Electrical and Electronic Engineering

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