NDLI: Reduction of Cogging Torque Due to Production Tolerances of Rotor by Using Dummy Slots Placed Partially in Axial Direction

Content Provider	IEEE Xplore Digital Library
Author	Nakano, M. Morita, Y. Matsunaga, T.
Copyright Year	1972
Abstract	A novel stator-core structure for reducing cogging torque due to production tolerances of a permanent-magnet (PM) motor is proposed. On the basis of the results of a theoretical investigation on cogging torque (due to production tolerances of the motors' rotor), a stator-core structure, in which dummy slots are partially configured in the axial direction, is proposed. The phase of the cogging torque component due to production tolerances can be reversed by appropriately designing the shape of the dummy slot. Consequently, by applying the proposed dummy-slot configuration, it is possible to eliminate the cogging torque. The results of 2-D and 3-D finite-element analyses, considering variations in the shape and position of the PMs, show the effectiveness of the proposed dummy-slot stator-core structure in reducing cogging torque. In addition, measurements of cogging torque of 12-slot/10-pole PM motors demonstrate that the proposed stator-core structure significantly reduces the cogging torque due to production tolerances while having almost no effect on the average torque and output power of the motors.
Sponsorship	IEEE Industry Applications Society
Starting Page	4372
Ending Page	4382
Page Count	11
File Size	2769615
File Format	PDF
ISSN	00939994
Volume Number	51
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Torque Forging Rotors Stator cores Permanent magnet motors Harmonic analysis stator core Cogging torque finite-element methods (FEMs) magnetic circuits motors permanent-magnet (PM) motors production tolerance
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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