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Electric Power Applications, IEE Proceedings B

Issue 5 • Date November 1986

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Displaying Results 1 - 4 of 4
  • The Brooks inductor: a study of optimal solenoid cross-sections

    Publication Year: 1986 , Page(s): 309 - 314
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (682 KB)  

    The Brooks inductor solves a problem, first studied by Maxwell and Gauss, of obtaining the greatest possible inductance with a given piece of wire. A simple procedure, presented graphically and algebraically, facilitates rapid design of air-cored solenoids to required inductance and current loadings. Calculations show that if the winding cross-section is not restricted to rectangles, as assumed hitherto, inductance values may be raised by about 1% above the Brooks limit. View full abstract»

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  • Wind-driven self-excited pole-changing induction generators

    Publication Year: 1986 , Page(s): 315 - 321
    Cited by:  Papers (3)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (917 KB)  

    Pole-changing single-winding schemes are applied to self-excited induction generators for the first time and shown to be suitable for wind-driven applications with wide variations in the driving speed. An attempt has also been made to present an analysis of self-excited induction generators by a new approach which is shown to be simple and elegant compared to the earlier methods. Results on a test machine wound with a 4/6-pole combination amply demonstrate the usefulness of pole-changing windings for induction generators. Experimental and predicted performances agree closely, validating the analysis proposed. View full abstract»

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  • Novel technique for the design of induction billet heaters

    Publication Year: 1986 , Page(s): 323 - 330
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (917 KB)  

    Induction billet heating is a well established industrial process for preheating prior to forging, rolling and extrusion. Existing methods of work coil design which are based on the assumption of an infinitely long solenoid and/or the use of a great amount of empirical data are not easily adapted to the design of nonuniform surface power densities. The design of coils to produce such power densities are very empirical at the present time. This paper describes the application of a novel proximity heating technique to design relatively easily, an induction billet heating work coil to give non-uniform surface power densities along a typical industrial workpiece. Theoretical predictions are correlated with practical measurements on typical industrial installations. View full abstract»

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  • Short-circuit electromagnetic forces in three-phase gas insulated systems with aluminium enclosure

    Publication Year: 1986 , Page(s): 331 - 340
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (834 KB)  

    In the paper, the short-circuit forces acting on three tubular conductors arranged in an equilateral triangle and constituting a 3-phase system enclosed by a cylindrical aluminium enclosure are examined. The relations for the time functions of the short-circuit forces are developed taking into account the transverse dimensions (diameter) of the conductors. The forces acting on such structures are compared with the forces on structures with filamentary conductors; it results that for usual structures the assumption of filamentary conductors causes a small error in the values of forces; for practical computations the simpler relations that concern forces on filamentary conductors can be used. View full abstract»

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