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Title: The theory and performance of A.C. axial flux machines
Author: Capaldi, Bernard
ISNI:       0000 0001 3519 2848
Awarding Body: University of Warwick
Current Institution: University of Warwick
Date of Award: 1973
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The work reported in this thesis is concerned with the design, testing and manufacture of a disc machine in order to compaxe its power to weight ratio with conventional (radial) machines. In the former machine the active current carrying conductors are radially positioned while the useful airgap flux is parallel to the rotor shaft. Both the squirrel cage induction motor and reluctance motor are covered. The airgap flux is obtained directly from the product of the airgap permeance and the airgap m. m. f. The errors involved in using the permeance wave concept is assessed for the reluctance motor by comparing fundamental and harmonic components in the airgap flux waveform obtained using permeance waves with that obtained from conformal transformation techniques. An equation is determined that can be used for calculating the magnitude of the ma imum inertia that can be synchronised by the reluctance motor for the practical range of polearc/pole pitch ratios. It is shown that both machines have a potential power/weight ratio of twice that of the radial machine. For the induction motor and reluctance motor maximum outputs of 1260 watts and 1100 watts were obtained respectively in a frame size of 220 mm O/D and 110 mm long. The limitations of the prototype machines are discussed and the relationship between the reluctance motor performance and the principal machine parameters is obtained.
Supervisor: Not available Sponsor: Science Research Council (Great Britain) (SRC)
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: TK Electrical engineering. Electronics Nuclear engineering