© The Institution of Electrical Engineers
The paper considers some of the developments that have taken place over the last few years in the field of synchronous machines of unusual geometry. The advances, in common with improvements in conventional drives, have only been possible because of developments in power electronics and materials. In the field of industrial drives, the linear induction motor with its simple variable voltage controller is established as a worthwhile product. Several manufacturers enjoy steady sales. Linear synchronous motors are a comparatively new development in this field; they have the virtue of considerably higher force production but require a variable frequency supply. However, in small sizes, power integrated circuits have become available that can be used to power the machines as brushless DC drives. A tubular version using permanent magnet excitation is described. In the area of transportation it is evident that, in the schemes under investigation, the linear synchronous motor is beginning to dominate the position. The most developed high speed systems use long-stator synchronous machines. However, short-stator versions are also under investigation, and the paper describes some recent studies. The development of disc brushless alternators is also described. In these machines the excitation winding is located on the same side of the airgap as the AC winding. A demonstration of the use of the new ‘high’-temperature superconductors, which uses a double disc form of these machines, is outlined.
References
-
-
1)
-
Eastham, A.R., Dawson, G.E., Ong, R., Coathup, L.W.: `Design and operation of the homopolar linear synchronous motor for linear drive and for integrated suspension/propulsion applications', Proceedings of International Conference on Maglev Transport Now and the Future, 1984, IMechE, p. 95–103.
-
2)
-
Edwards, J.D., Lindon, P., Williams, G.: `Linear reluctance motors for vehicle suspension and propulsion', IEE Colloq. Dig., 1983, 11, p. 1/1–1/3.
-
3)
-
Fiedrich, R., Dreiman, K., Leistickow, R.: `The power supply and the propulsion system of the Transrapid 06 vehicle results of trials', Proceedings of International Conference on Maglev Transport Now and for the Future, 1986, Vancouever, Canada, p. 243–249.
-
4)
-
P.D. Evans ,
J.F. Eastham
.
Slotless-disc alternator with AC-side excitation.
IEE Proc. B
,
6 ,
399 -
406
-
5)
-
JJ. Cathey ,
D.A. Topmiller ,
S.A. Nasar
.
A tubular self-synchronous motor for artificial heart pump drive.
IEEE Trans.
,
3 ,
315 -
319
-
6)
-
R. Friedrich ,
A. Weller
.
Langstatorantrieb für Magnetschellbahnen-charakteristische Systemeigenschaften.
VDI Ber.
,
365 -
386
-
7)
-
P.D. Evans ,
J.F. Eastham
.
Disc geometry synchronous machines with AC side excitation.
Acta polytechnica
,
5 ,
5 -
13
-
8)
-
Gibbon, M.A., Parker, J.H.: `Operational experience with a LIM-Drive transit system', IEEE 86CH2276-4, Proceedings of International Conference on Maglev and Linear Drives, 1986, p. 135–140.
-
9)
-
Richardson, K., Evans, P.D., Eastham, J.F., Appleton, A.D., Alford, N.McN.: `An alternator using a high tem-peratue superconductor for field excitation', Paper presented at Electrical Machines & Drives Conference, 13th–15th September 1989, London.
-
10)
-
McGeough, P.A., Sutton, A.: `Birmingham Airport Maglev vehicle construction', Proceedings of International Conference on Maglev transport, 1984, Birmingham, UK, IMechE, p. 177–184.
-
11)
-
Dalgleish, E.H., Riches, E.E.: `A review of Birmingham Maglev after one year in public service', IEEE 86CH2276-4, Proceedings of International Conference on Maglev and Linear Drives, 1986, p. 1–6.
-
12)
-
J.F. Eastham ,
M.J. Balchin ,
P.C. Coles
.
Full-scale testing of a high speed linear synchronous motor and calculation of end-effects.
IEEE Trans.
,
6 ,
2892 -
2894
-
13)
-
McLean, G.W., West, A.N.: `Combined lift and thrust for maglev vehicles using the zigzag synchronous motor', Proceedings of International Conference on Maglev Transport Now and the Future, 1984, IMechE, p. 87–97.
-
14)
-
V. Clausen ,
W. Leonhard
.
Microprocessor controlled linear synchronous motor as a positioning drive.
J. IEE
-
15)
-
J.F. Eastham ,
P.D. Evans
.
Novel disc motor designs.
Proc. IEE
,
5
-
16)
-
P.D. Evans ,
J.F. Eastham
.
Double-disc alternator with AC-side excitation.
IEE Proc. B
,
2 ,
95 -
102
-
17)
-
M.J. Balchin ,
J.F. Eastham
.
Characteristics of a heteropolar linear synchronous machine with passive secondary.
IEE J. Electr. Power Appl.
,
213 -
218
-
18)
-
E.R. Laithwaite
.
(1987)
, A history of linear electric motors.
-
19)
-
Eastham, J.F., Balchin, M.J.: `A comparison of some propulasion methods for magnetically-levitated vehicles', Proceedings of International Conference on Maglev Transport Now and the Future, 1984, IMechE, p. 87–97.
-
20)
-
Nenadovic, V.: `Maglev transit link for Birmingham airport', Proceedings of International Conference on Maglev transport, 1984, Birmingham, UK, IMechE, p. 169–176.
-
21)
-
H. Yamada
.
Recent trend of linear motor development in Japan.
J. IEE
-
22)
-
Eastham, J.F., Akmese, R.: `Linear synchronous tubular dive system with permanent magnet excitation: construction and standstill forces', 2nd International Conference on Electrical Drives, 20th–22nd September 1988, Romania, Poiana Brasov, p. PI–PII.
-
23)
-
R. Akmese ,
J.F. Eastham
.
Dynamic performance of a brushless DC tubular drive system.
IEEE Trans. on Magnetics
-
24)
-
P.D. Evans ,
J.F. Eastham
.
A disc-geometry homopolar synchronous machine.
IEE Proc. B
,
5 ,
299 -
307
-
25)
-
E.R. Laithwaite
.
Linear induction motors.
Proc. IEE
,
18 ,
461 -
470
-
26)
-
Heidelberg, G., Niemitz, K., Weinberger, H.: `The M-Bahn system', Proceedings of International Conference on Maglev Transport Now and for the Future, 1984, UK, IMechE, p. 159–168.
-
27)
-
J.F. Eastham ,
M.J. Balchin ,
P.C. Coles ,
D. Rodger
.
Comparison of short primary linear machines for high speed maglev vehicles.
IEEE Trans.
,
5 ,
2338 -
2343
-
28)
-
Akmese, R.: `Design, operation and dynamic performance of a brushless DC tubular drive system', 1989, PhD Thesis, Bath University.
-
29)
-
Hessler, H., Wackers, M.: `The transrapid Maglev system, its prospects for application', Proceedings of International Conference on Maglev and Linear Drives, 1986, Vancouver, IEEE, p. 257–267.
-
30)
-
Bosco, G.B., Corbitt, H.E.: `Axial airgap dynamo-electric machine', 3 261 998, July 1966, US patent.
-
31)
-
J.F. Eastham
.
Iron-cored linear synchronous machines.
Electron – Power
,
239 -
242
-
32)
-
G.W. McLean
.
Review of recent progress in linear motors.
IEE Proc. B
,
6 ,
380 -
416
-
33)
-
G.V. Sadler ,
A.W. Davey
.
Applications of linear induction motors in industry.
Proc. IEE
,
6 ,
765 -
776
-
34)
-
F.J. Allen
.
High Sppee, brushless alternator.
Electr. Rev.
-
35)
-
P.D. Evans ,
J.F. Eastham
.
Disc geometry single-phase alternator with slotless stator and AC-side excitation.
IEE Proc. B
,
4 ,
270 -
278
http://iet.metastore.ingenta.com/content/journals/10.1049/ip-b.1990.0005
Related content
content/journals/10.1049/ip-b.1990.0005
pub_keyword,iet_inspecKeyword,pub_concept
6
6