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IEE Proceedings B - Electric Power Applications

Issue 4 • Date July 1982

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Displaying Results 1 - 7 of 7
  • Stray loss in solid-rotor induction machines

    Publication Year: 1982, Page(s):181 - 189
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (926 KB)

    The paper presents measurements and calculations of the stray loss in several solid-rotor versions of British Rail's tubular-axle induction motor (TAIM) of 150 kW capacity. The use of a large airgap and of narrow slot openings as means of reducing the loss to manageable levels are investigated, and it is found that the large gap approach is more successful. View full abstract»

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  • Limited motion rotary actuators of the toroidal-stator, permanent-magnet rotor type

    Publication Year: 1982, Page(s):190 - 198
    Cited by:  Papers (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (883 KB)

    Some aspects of the design of a toroidal-stator, permanent-magnet, salient-pole-rotor type of limited rotation, double-acting rotary actuator are examined. Curves are presented which show how important design parameters are affected by the airgap size. Analysis leading to the prediction of stator self inductance, for a variety of types of rotor configuration, is presented. Test results are compare... View full abstract»

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  • Control method for compensation of switching delays in transistors

    Publication Year: 1982, Page(s):199 - 204
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (747 KB)

    The operation of a group of parallel-connected, nominally identical switching transistors is prone to difficulties owing to spread in switching times. The fastest and slowest transistors in the group are liable to fail through excessive power dissipation. A method of regulating transistor operation is described in which the application and removal of base current is phase controlled to compensate ... View full abstract»

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  • Technique for pulse elimination in pulsewidth-modulation inverters with no waveform discontinuity

    Publication Year: 1982, Page(s):205 - 210
    Cited by:  Papers (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (665 KB)

    To realise the full output potential of a PWM inverter, it is necessary to make the transition from a PWM output waveform to a square-wave output. This is usually achieved by dropping pulses from the PWM waveform, which results in step changes in the output voltage. It is shown that, generally, pulse dropping is unavoidable except with one particular type of inverter circuit. A waveform generation... View full abstract»

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  • Closed-loop control of stepping motors: prediction and realisation of optimum switching angle

    Publication Year: 1982, Page(s):211 - 216
    Cited by:  Papers (11)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (786 KB)

    If a stepping motor is operated under closed-loop control, then, for maximum torque production, the switching angle must vary with the stepping rate. This variation is investigated theoretically for a variablereluctance stepping motor and a low-cost method of implementing a speed-dependent switching-angle control is described. Experimental results indicate that this type of control enables the mot... View full abstract»

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  • Characteristics of a small wind-power system with dc generator

    Publication Year: 1982, Page(s):217 - 220
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (318 KB)

    The performance characteristics of a small-scale wind-power system with a separately or self-excited DC generator are analysed and experimentally confirmed. The relations between output and wind speed are derived, and their effect on performance is discussed. View full abstract»

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  • State-space compensation applied to the control of a current-fed induction motor

    Publication Year: 1982, Page(s):221 - 226
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (435 KB)

    A theory of control in state space is applied to an electrotechnical process associating an asynchronous motor and a static convertor. The object is to realise current regulation for an induction machine. The process is inherently nonlinear and a classic regulator cannot ensure the same performances over all the operating range. A mathematical model of the process to be controlled is presented and... View full abstract»

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