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Fully slotless turbogenerators

Fully slotless turbogenerators

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The constraints restricting the choice of rotor length and diameter in a turbogenerator are relaxed, and much higher airgap flux densities are possible if a fully slotless construction is employed. Capacities about three times greater than can be achieved with conventional machines are possible, and there is wide scope for optimising the dimensions and loadings of machines of present -day ratings; e.g. a 660 MW slotless machine could show savings of about 2 MW in losses, 4 m in length and 150 t in mass and would have reactances more suited to stable operation. Gas or liquid cooling of the active parts could be employed without special problems.

Inspec keywords: turbogenerators; machine theory; machine windings

Other keywords: rotor; fully slotless turbogenerators; airgap flux densities; constraints

Subjects: a.c. machines

References

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      • G.W. Carter . (1967) , The electromagnetic field in its engineering aspects.
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      • B.A. Adkins . (1957) , The general theory of electrical machines.
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      • E.R. Laithwaite . The goodness of a machine. Proc. IEE , 3 , 538 - 541
    4. 4)
      • G. Aichholzer . New ways of building turbogenerators up to 2 GVA, 60 kV. Elektrotech. & Machinenbau , 1 - 11
    5. 5)
      • A.B.J. Reece , T. Preston . , Technical and economic feasibility of slotless-stator turbine generators.
    6. 6)
      • 52449, 1965, British Patent Application, ASEA:.
    7. 7)
      • E.J. Davies . Airgap windings for large turbogenerators. Proc. IEE , 529 - 536
    8. 8)
      • A.C. Ham . Carbon-fibre composites for aerospace structures. Phys. Bull. , 474 - 478
    9. 9)
      • P.J. Lawrenson . Calculation of machine end-winding inductances with special reference to turbogenerators. Proc. IEE , 6 , 1129 - 1134
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