© The Institution of Engineering and Technology
The magnetomotive force (mmf) of a modular planar winding contains multiple distinct waveforms which travel in opposite directions. An inductive rotor will produce oppositional forces from both waveforms, giving a poor overall performance. This study concerns the use of planar modular windings in linear induction motors by harmonic cancellation. A double-sided arrangement of stators is used and a mechanical offset is applied between the two stators such that the fundamental mmf waveform is reinforced and the oppositional harmonic mmf waveform is suppressed. A comprehensive mathematical analysis of mmf harmonic behaviour in the offset machines has been developed. Further, a high-speed dynamic test rig has been produced, which verifies the excellent performance of the offset modular configuration.
References
-
-
1)
-
Eastham, J.F., Cox, T., Lai, H.C., Proverbs, J., Foster, A., Colyer, S.: `Electromagnetic launch using novel linear induction machines', IMarEST engine as a weapon, December 2006, London, UK, p. 170–179.
-
2)
-
Eastham, J.F., Cox, T., Proverbs, J.: `Comparison between plate and wound secondaries for linear induction motors with concentrated winding primaries', SPEEDAM, June 2008, Ischia, Italy, p. 142–146.
-
3)
-
Eastham, J.F., Cox, T.: `Transient analysis of offset stator double sided short rotor linear induction motor accelerator', MAGLEV, December 2008, San Diego, USA.
-
4)
-
D. Roger ,
H.C. Lai ,
P.J. Leonard
.
Coupled elements for problems involving movement.
IEEE Trans. Magn.
,
2 ,
548 -
550
-
5)
-
J.F. Eastham ,
T. Cox ,
H.C. Lai ,
J. Proverbs
.
The use of concentrated windings for offset double stator linear induction motors.
Electromotion
,
2 ,
51 -
56
-
6)
-
Leonard, P.J., Rodger, D., Lai, H.C., Norton, M., Hill-Cottingham, R.J.: `Coupling FE with power electronics and rotor dynamics of motors', IEE Seminar on Current Trends in the Use of Finite Elements (FE) in Electromechanical Design and Analysis, January 2000, p. 6/1–6/6, Ref. 2000/013.
-
7)
-
Eastham, J.F.: ‘Improvements in and relating to electromotive machines’. International Patent Application PCT/GB2007/003849, 2007.
-
8)
-
Wang, J., Xia, Z.P., Howe, D., Long, S.A.: `Comparative study of 3-phase permanent magnet brushless machines with concentrated, distributed and modular windings', IET power electronics, machines and drives, March 2006, Dublin, Ireland, p. 489–493.
-
9)
-
J.F. Eastham ,
T. Cox ,
P. Leonard ,
J. Proverbs
.
Linear induction motors with modular winding primaries and wound rotor secondaries.
IEEE Trans. Magn.
,
11 ,
4033 -
4036
-
10)
-
Eastham, J.F.: ‘Improvements in and relating to electromotive machines’. International Patent Application PCT/GB2007/003851, 2007.
-
11)
-
T. Cox ,
J.F. Eastham ,
J. Proverbs
.
End turn leakage reactance of concentrated modular winding stators.
IEEE Trans. Magn.
,
11 ,
4057 -
4061
-
12)
-
D. Rodger ,
H.C. Lai ,
P.J. Leonard ,
R.J. Hill-Cottingham
.
(2005)
MEGA finite element modelling package.
http://iet.metastore.ingenta.com/content/journals/10.1049/iet-epa.2009.0086
Related content
content/journals/10.1049/iet-epa.2009.0086
pub_keyword,iet_inspecKeyword,pub_concept
6
6