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IEE Proceedings B - Electric Power Applications

Issue 6 • Date November 1987

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Displaying Results 1 - 11 of 11
  • 3rd International Conference on Electrical machines and drives

    Publication Year: 1987
    IEEE is not the copyright holder of this material | PDF file iconPDF (60 KB)
    Freely Available from IEEE
  • Design and construction of a high-speed high-performance direct-drive handpiece

    Publication Year: 1987, Page(s):286 - 296
    Cited by:  Papers (14)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1345 KB)

    The electrical and mechanical design of a precision handpiece (or handtool) delivering 10 W at 150 000 rev/min is described. The 2-pole synchronous drive motor has a samarium-cobalt rotor magnet of axial length 7 mm and diameter 3 mm. The motor has mumetal laminations and a bar winding which is supplied at 2.5 kHz by three toroidal transformers built into the unit. An equivalent circuit and experi... View full abstract»

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  • The physics of fusion welding. Part 2: Mass transfer and heat flow

    Publication Year: 1987, Page(s):297 - 316
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (2928 KB)

    The second part of the review covers mass and heat transfer in fusion welding, other than that specifically related to the arc column. Metal transfer is considered under the headings of flux-shielded and gas-shielded processes. The major portion of experimental work is concerned with the gas-shielded processes, for which a substantial amount of quantitative information is available on such matters... View full abstract»

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  • Improving the open-loop torque step response of induction motors

    Publication Year: 1987, Page(s):317 - 323
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1122 KB)

    Driving functions which require changes of torque and speed of induction motors produce DC offsets or transients in the torque-producing flux and current waves in the machine. There are two time constants controlling the respective rates at which they disappear and if these are short compared with the rate at which torque and speed are required to change, they can be neglected. Robotic systems pla... View full abstract»

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  • Cage rotor heating at standstill

    Publication Year: 1987, Page(s):325 - 332
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (980 KB)

    Induction motors classified as `increased safety¿ (Exe) must undergo a locked rotor test at full voltage, to determine the maximum cage temperature rise obtained within a specified time. The paper shows that the presence of stator MMF harmonics will cause the temperature rise observed during this test to vary from bar to bar around the rotor periphery. In a regular 3-phase machine the temperature... View full abstract»

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  • Normalised high-speed performance analysis of small hybrid stepping motors

    Publication Year: 1987, Page(s):333 - 338
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (709 KB)

    Despite the widespread use of hybrid stepping motors, the relationship between the parameters of the motor/drive combination and the steady-state capability is not widely understood. The steady-state behaviour of hybrid motors with constant-voltage variable-frequency supplies is analysed, using the Blondel circle diagram to illuminate the power conversion process, and identify the parameters which... View full abstract»

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  • New method of analysis and performance prediction for thyristor voltage-controlled RL loads

    Publication Year: 1987, Page(s):339 - 347
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (803 KB)

    A new method of analysis of thyristor voltage-controlled RL loads is described, based upon power considerations. Use of the thyristor conduction angle as the independent variable is shown to yield the most direct and efficient computation of performance. Purely resistive and inductive loads are covered as special cases. The 3-phase circuit with antiparallel thyristors is considered in detail as an... View full abstract»

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  • Arc reignition characteristics when welding with sine-wave and square-wave power supplies

    Publication Year: 1987, Page(s):348 - 354
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (941 KB)

    The power supply required for stabilising the welding arc must have a relatively high open-circuit voltage. When using a metal electrode and a sine wave alternative-current supply, the open-circuit voltage can be as high as 80 V. Recently developed square-wave power supplies offer the potential of reducing the open-circuit voltage to a safe-level because of the more rapid build up of current on cu... View full abstract»

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  • Erratum: Self-excited induction generator/force-commutated rectifier system operating as a DC power supply

    Publication Year: 1987
    IEEE is not the copyright holder of this material | PDF file iconPDF (108 KB)
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  • Unified treatment of core losses and saturation in the orthogonal-axis model of electric machines

    Publication Year: 1987, Page(s):355 - 363
    Cited by:  Papers (45)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (850 KB)

    The paper treats simultaneously the core losses and the magnetic saturation of the main-flux path in the orthogonal-axis model of electric machines. Core losses are modelled by additional fictitious windings on the stator and on the rotor. Tests are suggested to determine the constants of these windings. A set of equations, expressed as a state equation, is derived for the general case. Synchronou... View full abstract»

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  • On the stability of a static slip energy recovery drive

    Publication Year: 1987, Page(s):364 - 368
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (511 KB)

    It has been reported elsewhere that there are certain instability regions in the operation of the subsynchronous static slip energy recovery scheme for the speed control of a slip-ring induction motor. Eigen value analysis of the linearised model of an induction motor is used to study the stability behaviour of this scheme and the results show that the drive system does not become unstable. The ef... View full abstract»

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