Rotor losses in a high speed synchronous generator with permanent magnet excitation and rectifier load Veen, van der, J.L.F.; Offringa, L.J.J. Published: 01/01/1996 Document Version Publisher’s PDF, also known as Version of Record (includes final page, issue and volume numbers) Please check the document version of this publication: • A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website. • The final author version and the galley proof are versions of the publication after peer review. • The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. • Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Download date: 28. Jul. 2018
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Rotor losses in a high speed synchronous generator withpermanent magnet excitation and rectifier loadVeen, van der, J.L.F.; Offringa, L.J.J.
Published: 01/01/1996
Document VersionPublisher’s PDF, also known as Version of Record (includes final page, issue and volume numbers)
Please check the document version of this publication:
• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differencesbetween the submitted version and the official published version of record. People interested in the research are advised to contact theauthor for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers.
Link to publication
General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright ownersand it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.
• Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ?
Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediatelyand investigate your claim.
Rotor losses in a high speed synchronous generator with permanent magnet excitation and rectifier load I by J.L.F. van der Veen and L.J.J. Offringa. - Eindhoven: Eindhoven University of Technology, 1996. - VIII, 43 p. - (Eindhoven University of Technology research reports; 96-E-301). ISBN 90-6144-301-6 NUGI832 Trefw.: synchrone generatoren I harmonische analyse I elektrische machines; verliezen I elektrische machines ; permanente magneten. Subject headings: permanent magnet generators I harmonic analysis I eddy current losses.
II
ROTOR LOSSES IN A HIGH SPEED SYNCHRONOUS GENERATOR WITH PERMANENT MAGNET EXCITATION AND RECTIFIER LOAD
J.L.F. van der Veen and L.J.J. Offringa
Abstract-In an early stage of the development of a high speed synchronous generator with permanent magnet excitation it became apparent that rotor losses due to asynchronous components of the air-gap field, are a major problem. So, a model is needed which includes the effects of space harmonics and harmonics in the stator current caused by a rectifier load. An approximate solution for the rotor losses caused by the asynchronous components has been derived. The derived formulae show the effects of machine dimensions and harmonics. The main purpose of this study is to have a tool for making an early choice between several configurations. A modified 9 phase system, combined with a shield around the permanent magnet rotor, is a prospective option.
keywords: synchronous generators, permanent magnets, harmonic analysis, rotor losses, high speed, eddy current losses.
Veen, J.L.F. van der and L.J.J. Offringa Rotor losses in a high speed synchronous generator with permanent magnet excitation and rectifier load. Eindhoven: Eindhoven University of Technology, Faculty of Electrical Engineering, 1996. EUT Report 96-E-301
Address of the authors Section Electromechanics and Power Electronics (EMV) Group MBS Faculty of Electrical Engineering Eindhoven University of Technology P.O.Box 513, 5600 MB, Eindhoven, The Netherlands Tel. 040-2473571/2473568 Fax 040-2434364 Email [email protected]@ele.tue.nl
1.3. Conducting shield and division of the stator circuit in subsystems
1 3 4
2. Analysis of harmonic components ......................................... 5 2.1. Three phase winding ................................................. 5 2.2. Simple elimination of harmonic components ................................. 6 2.3. Transformation to rotor coordinates ....................................... 7 2.4. Division of the stator phase windings in subsystems .......................... . 2.5. Polyphase systems ................................................. .
8 10
3. Rotor losses caused by asynchronous rotating fields ............................ 12 3.1. Calculation of the rotor losses with an approximate solution of the field equations 12 3.2. Quality factor ...................................................... 17
4. Comparison of rotor losses .............................................. 19 4.1. Summary of the results from chapter 2 and 3. .............................. 19 4.2. Winding density of space harmonics ...................................... 21 4.3. Harmonics of the stator currents ......................................... 23
5. Numerical calculation ................................................. 24 5. \. Results of the calculations ............................................. 27
While not Eof(In_File) do begin readln(In_File,pararneter); i:=Pos('=' ,parameter); len: =Length(parameter); pararneter:=Copy(parameter,i+ I ,len-i); geg_str[j):=parameter; j:=j+ I; end;
Val(ge~str[ I),max I ,test); Val(ge~str[2),k,test);
Val(ge~str[3),p,test);
Val(ge~str[ 4).f,test); V al(ge~str[ 5),Idc,test); Val(ge~str[6),rl,test);
V al(ge~str[7),r2,test); Val(geg_str[8),r3,test); Val(ge~str[9),d,test);
syn I 1 asyn I 23 69.1 69.1 0.593 4.6 asyn I 25 37.6 106.7 0.593 4.3 syn 5 5 asyn 5 19 9.3 116.0 0.593 5.6 syn 7 7 asyn 7178.7124.80.5936.3 syn II 11 asyn II 13 11.7 136.50.5938.3 asyn 13 11 15.0151.50.59310 syn 13 13 asyn 17725.4 176.90.593 16.5 syn 17 17 asyn 19 5 31.7 208.6 0.593 23.8 syn 19 19 asyn 23 1 36.0 244.6 0.593 54.1 syn 23 23 asyn 23 25 0.1 244.70.4196.0 asyn 25 1 30.5 275.1 0.593 54.1 asyn 25 23 0.2 275.3 0.419 6.5 syn 25 25 Pv= 275.3
Page 40
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