Design and Performance of Reluctance Motors with Unlaminated Rotors

Chalmers, B.J.; Mulki, A.S.

doi:10.1109/tpas.1972.293309

IEEE Trans. on Power Apparatus and Syst.

1972

DOI: 10.1109/tpas.1972.293309

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Design and Performance of Reluctance Motors with Unlaminated Rotors

B.J. Chalmers

A.S. Mulki

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1972

1983

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Cited by 13 publications

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“…0018-0251/83/0300-0298 $00.75 © 1983 IEEE Experimental and analytical investigations on the effect of provision of axial slits on the asynchronous performance of polyphase solid-iron rotor reluctance machines were reported earlier [I, 2], and this paper, in continuation, reports the influence of copper in the axial slots or slits, or both. A review of earlier literature shows that the only work available on slitted rotor reluctance machines is that of Chalmers and Mulki [6]. presenting the effect of copper in slots only, and in the vicinity of the synchronous region.…”

mentioning

confidence: 99%

Asynchronous Performance of Slitted Rotor Reluctance Machines¿Effects of Copper Conductors

Krishnamoorthy

Krishnamurthy

1983

IEEE Trans. Aerosp. Electron. Syst.

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mentioning

confidence: 99%

Asynchronous Performance of Slitted Rotor Reluctance Machines¿Effects of Copper Conductors

Krishnamoorthy

Krishnamurthy

1983

IEEE Trans. Aerosp. Electron. Syst.

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Characteristics of solid rotor three‐phase reluctance motors

Uezato

1978

Electrical Engineering Japan

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General theory of solid-rotor induction machines

Chalmers

Woolley

1972

Proc. Inst. Electr. Eng. UK

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A general theory of the torque/slip and current/slip characteristics of solid-rotor induction machines is developed in terms of dimensionless coefficients, and its validity is demonstrated by measurements on machines in the range 6-1500 W. Generalised characteristics are presented in the form of curves of the dimensionless coefficients. The analysis is based on an expression for equivalent rotor impedance which is inversely proportional to the product of airgap flux and slip and which has a constant phase angle. Various methods of calculating eddy-current losses in solid rotors give impedances of this form, and the use of some of these in the generalised analysis is assessed. LEST OF PRINCIPAL SYMBOLS= constant in equation for Z 2 = average flux density in airgap = saturation flux density of rotor material = diameter of rotor = e.m.f. induced in statbr phase by $ = stator supply frequency = stator current per phase = stator electric loading, A/m = end-effect factor = fundamental stator-winding factor = length of rotor body = number of stator phases = effective number of stator turns in series per phase = number of pole pairs = airgap power or torque = power loss in rotor = mechanical output power = fractional slip = stator terminal voltage per phase = co-ordinates of no-load point on generalised current locus = complex stator series impedance per phase = complex rotor impedance referred to stator, per phase = value of Z 2 when s = 1 and $ = $ 0 = complex magnetising impedance per phase = Thevenin equivalent impedance of stator = ratio of secondary impedance to primary impedance = dimensionless current coefficient = /3 at synchronous speed = dimensionless torque coefficient = phase angle of Z m = dimensionless slip coefficient = phase angle of Z x = resistivity of rotor material = phase angle of Zp = flux per pole = < £ > when E = V = phase angle of stator current = 0 S at synchronous speed = phase angle of rotor impedance 1 INTRODUCTION Interest has existed for many years in the asynchronous operation of solid-rotor machines, notably with reference to the transient and asynchronous performance of turbogenerators, 1 induction motors with solid rotors 2 and the starting of salient-pole motors with solid poles. 2 ' 3 This interest has also been extended to include solid-rotor induction motors operated with speed control by voltage reduction.starting and synchronising performance of reluctance motors with unlaminated rotors. So far, only experimental results and qualitative accounts of these aspects have been published. 5 » 6Early attempts at calculation of eddy-current losses induced in solid steel rotors relied on electromagnetic theory as derived for a linear medium. More recently, approximate analyses have been developed which take magnetic saturation into account in a variety of ways. For example, the theory 7 * 8 based on a rectangular magnetisation characteristic has been widely adopted, 9 " 12 and has been shown to give results which are generally satisfactory. Where they have been attempted, refinements have...

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Design and Performance of Reluctance Motors with Unlaminated Rotors

Cited by 13 publications

References 20 publications

Asynchronous Performance of Slitted Rotor Reluctance Machines¿Effects of Copper Conductors

Asynchronous Performance of Slitted Rotor Reluctance Machines¿Effects of Copper Conductors

Characteristics of solid rotor three‐phase reluctance motors

General theory of solid-rotor induction machines

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