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Calculation of rotor losses in PM machines with retaining sleeves using transfer matrices

Calculation of rotor losses in PM machines with retaining sleeves using transfer matrices
Calculation of rotor losses in PM machines with retaining sleeves using transfer matrices
Accurate calculation of rotor losses in PM synchronous machines can be critical because these losses tend to be very small relative to others in the machine. Numerical methods, such as finite element analysis (FEA), can now provide accurate estimates of these losses, but they, especially 3D FEA, can be time consuming. Analytical methods therefore remain very useful as quick tools for estimating losses at the early design stages. This paper presents a new improved analytical method for the calculations of rotor eddy current losses in PM machines using a reformulation of the current sheet model into transfer matrices to solve Helmholtz’s diffusion equation. Such methodology reduces the complexity of the problem significantly, particularly in machines with retaining sleeves, and simplifies the numerical evaluation of the resulting equations. A high speed PM machine with a retaining sleeve is presented as a case study.The analytical results are verified using FEA.
1751-8660
Renedo Anglada, Jaime
4ba2df6e-f91f-4ffc-8169-068852e59e90
Sharkh, Suleiman M.
c8445516-dafe-41c2-b7e8-c21e295e56b9
Yuratich, Michael A.
80b84a92-aa40-4e03-8c65-993ee5729380
Renedo Anglada, Jaime
4ba2df6e-f91f-4ffc-8169-068852e59e90
Sharkh, Suleiman M.
c8445516-dafe-41c2-b7e8-c21e295e56b9
Yuratich, Michael A.
80b84a92-aa40-4e03-8c65-993ee5729380

Renedo Anglada, Jaime, Sharkh, Suleiman M. and Yuratich, Michael A. (2018) Calculation of rotor losses in PM machines with retaining sleeves using transfer matrices. IET Electric Power Applications. (doi:10.1049/iet-epa.2017.0863).

Record type: Article

Abstract

Accurate calculation of rotor losses in PM synchronous machines can be critical because these losses tend to be very small relative to others in the machine. Numerical methods, such as finite element analysis (FEA), can now provide accurate estimates of these losses, but they, especially 3D FEA, can be time consuming. Analytical methods therefore remain very useful as quick tools for estimating losses at the early design stages. This paper presents a new improved analytical method for the calculations of rotor eddy current losses in PM machines using a reformulation of the current sheet model into transfer matrices to solve Helmholtz’s diffusion equation. Such methodology reduces the complexity of the problem significantly, particularly in machines with retaining sleeves, and simplifies the numerical evaluation of the resulting equations. A high speed PM machine with a retaining sleeve is presented as a case study.The analytical results are verified using FEA.

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Accepted/In Press date: 26 April 2018
e-pub ahead of print date: 8 June 2018

Identifiers

Local EPrints ID: 421072
URI: http://eprints.soton.ac.uk/id/eprint/421072
ISSN: 1751-8660
PURE UUID: 1e569d1f-c5b3-443e-bd90-076e587f7b00

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Date deposited: 22 May 2018 16:30
Last modified: 07 Oct 2020 05:07

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