Applied Electromagnetism

Hammond, P.; Caspari, M. E.

doi:10.1119/1.1987097

Cited by 13 publications

(14 citation statements)

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“…126 Nothing has been said yet about general electromagnetic design. 94 The doubling of outputs every 15 years or so, which seems to be still occurring, is heavily influenced by the aerodynamic and thermodynamic design process. However, there is yet much to be gained from a better understanding of the secondary phenomena in machines.…”

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confidence: 99%

Large a.c. motors

Bone¹,

Schwarz²

1973

Proc. Inst. Electr. Eng. UK

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This review covers the range of basic large a.c.motors,comprising squirrel-cage and slip-ring induction,synchronous and a.c.-commutator motors,in the output range of 1-20/30 MW,and the size range of 0-5-30 kW per rev/min,with centre heights ranging from 450 to 1250 mm. The underlying theme may be described in general terms as 'system design 1 in the widest sense; i.e. the effect of the environment on motor design and application, and vice versa. Thus, amongst the major topics covered are stator-insulation requirements and techniques, with particular reference to the surge voltages encountered in modern supply systems that have high short-circuit capacities. This leads to the consideration of system-stability problems on the one hand, and the choice of enclosures on the other. Conversely,the effect of motors on the environment, e.g. noise and the problems of heat removal (again affecting the choice of enclosures) are dealt with as complementary problems. With respect to motor design proper, emphasis is placed on aerodynamic and thermodynamic problems, and the importance of 2nd-order electromagnetic phenomena and reliability. To allow the reader to obtain detailed information (which cannot be covered in a broad survey of this type) on specific subjects, a carefully selected list of relevant references is given.

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mentioning

confidence: 99%

Large a.c. motors

Bone¹,

Schwarz²

1973

Proc. Inst. Electr. Eng. UK

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“…That is, the loss is dependent on the skin depth of the material at a particular frequency. If the skin depth is very large or very small then the loss will be small, but there are intermediate values of skin depth for which the loss in the current path becomes large, as described by Hammond [2]. Now this can occur if the building bar currents transfer to the stator when large losses may be expected in the high-resistivity steel-core plate.…”

Section: Influence Of Internal Axial Fluxmentioning

confidence: 95%

Currents flowing in the stator-core frames of large electricalmachines

Tavner¹,

Penman

1983

IEE Proc. C Gener. Transm. Distrib. UK

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The stator cores of large electrical machines are supported in a steel frame in which electrical currents are circulated by leakage flux from the core. These currents can cause serious overheating. The paper gives a qualitative review of the electromagnetic factors which affect the flow of these frame currents. The work shows that the effects of frame currents may be reduced if the frame members are connected electrically in a way which more effectively suppresses core-end leakage flux.

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“…For modeling these losses with the help of moving domain walls, see e.g. [3]. The values of R W1, R D and L D will be determined by four-point measurements and the value of R Fe will appear as a fit-parameter.…”

Section: Valve Reactor Equivalent Circuit Diagrammentioning

confidence: 99%

On the simulation of valve reactors

Trung

Fischer

2007

2007 European Conference on Power Electronics and Applications

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A model of saturable valve reactor is investigated. Starting from the equivalent circuit diagram of a transformer, the relative differential permeability of the strip wound cores and the coefficient of coupling are identified as basic parameters. These parameters are determined with the help of impulse voltage measurements for a certain reactor with Silectron strip wound cores. Thereby new results are gained concerning the dynamic magnetization behavior of these cores. Simulation yields good agreement with measurement for impulse magnetization.

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Applied Electromagnetism

Cited by 13 publications

References 0 publications

Large a.c. motors

Large a.c. motors

Currents flowing in the stator-core frames of large electricalmachines

On the simulation of valve reactors

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