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Identification of parameters for superconducting generators having free or fixed outer rotor, based on tests and calculations
The generator, with its concentric and in part solid and conductive parts, is represented by a shell model, and the parameters of the system of equivalent windings are first obtained approximately using a two-dimensional analytical field calculation. The effect of the finite length, which is neglected in this field calculation, is taken into account by variation of the model geometry and material ...Show More
Currents Induced in the Inner Stator Frame of Large Turbogenerators by the End-Zone Field
IEEE Power Engineering Review
Cited by: Papers (1)
First Page of the Article
Show MoreCurrents Induced in the Inner Stator Frame of Large Turbogenerators by the End-Zone Field
A method is described, based on 3-dimensional field calculations, for calculating the eddy-currents induced in the inner stator frame by the end-zone field; these currents are an order of magnitude greater than those caused there by yoke saturation, and their mechanism is explained through the calculation results for given alternative designs; it is based mainly on the shielding of the end-zone fi...Show More
First Page of the Article
Show MoreIn order to verify the design procedures for superconducting machines, a small 2-pole externalpole synchronous generator with a stationary field winding of NbTi has been built and tested. A report on the first 20 test cycles is given, including discussion of difficulties encountered. In addition to steady-state measurements, which agree well with the calculations, the results of the first tests of...Show More
Electromechanical Vibration in the Radiation Shield of a Turbogenerator with a Superconducting Field Winding
For thermal insulation, a superconducting turborotor must have a radiation shield. This is a thin-walled flexible cylinder (shell). This paper describes a theory of the vibration behavior of such a shell, including the interaction between the electromagnetic and mechanical phenomena. This theory confirms that the pure "mechanical" resonance frequencey is somewhat increased to an "electromechanical...Show More
Transient and small perturbation behaviour of superconducting turbogenerators
An improved method is used capable of calculating any form of generator transients. In this method, based on a two-dimensional model, solid conducting parts of the rotor are represented by multiple thin conducting layers. The resulting non-linear differential equations are solved numerically for the recently proposed new rotor arrangement with independently rotatable (free) outer rotor. The result...Show More
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