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Electric Power Applications, IEE Proceedings B

Issue 1 • Date January 1987

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Displaying Results 1 - 8 of 8
  • Optimum design of an induction motor for operation with current source inverters

    Page(s): 1 - 8
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (979 KB)  

    The aspects of design associated with the current source inverter (CSI) induction motor drive are reviewed and a systematic procedure for the optimum design of the drive is presented. The optimisation is carried out using the sequential unconstrained minimisation technique. The study takes into account the inherent slow commutation process, the torque pulsation and the peak voltage stress in the CSI drive. A comparative study of the optimum CSI fed motor and a cost optimal mains fed motor under CSI supplies is made using digital computer simulation. The studies show that the method presented can form the basis for standardised CSI fed drive design of different ratings, in the large-volume production of these drives. View full abstract»

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  • High performance DC motor drive using a PWM rectifier with power transistors

    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (599 KB)  

    This work presents a new rectifier connected in the bridge configuration, which uses six bidirectional switches to connect the 3-phase source to the load. Each bidirectional switch comprises two power MOSFET transistors working in the switching mode. A simple pulse-width modulation strategy is developed using the ficticious source concept. The convertor works at a high switching frequency and for this reason it does not need large storage elements. In addition, the simple control strategy and the high controllability of the power elements produce a dramatic simplification of the control and logic circuits. The convertor accepts regenerative power and for this reason it is well suited for use in the 4-quadrant speed control of DC machines. The performance of the convertor was experimentally investigated in the speed control of a 0.6 kW DC servomotor. View full abstract»

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  • Bilateral DC to AC convertor using a high frequency link

    Page(s): 15 - 24
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1257 KB)  

    The paper describes a bilateral high frequency DC/AC convertor for uninterrupted power supply applications. The proposed convertor can also function as a battery charger without any additional power circuit components. Moreover, this convertor provides ohmic isolation between the DC source and the load at high switching frequencies for the forward and reverse power flow modes of operation. Consequently, the convertor exhibits high power density. View full abstract»

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  • Harmonic minimisation in microprocessor controlled current fed PWM inverter drives

    Page(s): 25 - 41
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (2404 KB)  

    New microprocessor-based pulse-width modulation (PWM) control techniques are presented for the current fed inverter (CFI) drive, which minimise the harmonic torque and speed-ripple effects normally associated with low-speed quasi-square-wave operations of CFI drives. It is shown how high-pulse number PWM harmonic elimination current strategies can be developed and used to eliminate substantially greater numbers of harmonics, which hitherto had not been thought a practical possibility. In addition, new PWM harmonic minimisation strategies are presented for the CFI drive, based on the minimisation of a weighted function of stator current harmonic amplitudes. These PWM current minimisation strategies are shown to give superior performance in terms of smoother rotor motion, reduced speed ripple and positional error and can therefore be used to extend the viable range of operation and application of the CFI drive. The complete theoretical development of the new harmonic minimisation PWM current strategies is presented and confirmed using both computed results and experimental results obtained from a previously developed microprocessor-controlled PWM CFI drive. Finally, the PWM control techniques are extended to the `duplex¿ CFI drive and predicted to give considerable improvements in low-speed performance. View full abstract»

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  • Costing energy savings for a dual-mode motor

    Page(s): 42 - 46
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (605 KB)  

    An analysis is presented of energy savings realised for a fixed speed induction motor by using a dual-mode design. This uses a nonstandard divided stator winding allowing two alternative modes of connection of the winding sections, to be selected according to loading. Control is automatic using microprocessor and thyristor switches but alternatively manual control may be used. Power losses are reduced and soft starting is achieved. The paper presents measured power loss against load characteristics for both a conventional and a dual-mode motor that are identical except for the stator winding. Possible duty cycles are assumed and the resulting energy savings from adopting the dual-mode design in place of a conventional motor are calculated. A present value is attributed to the losses, allowing the cost effectiveness of the dual-mode motor, based on power savings alone, to be determined. View full abstract»

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  • Electrical design of air-cored synchronous generators using superconducting field and armature windings

    Page(s): 47 - 52
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (659 KB)  

    The emergence of superconducting wires able to support 50 Hz fields and current variations allows AC machines with superconducting coils both field and armature windings to be studied. The electrical design of a 500 kW generator is presented, using a no-quench criterion for the SC wire, even during transients. The results are good enough to predict the construction of a prototype AC generator. View full abstract»

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  • Single-phase switched reluctance motors

    Page(s): 53 - 56
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (408 KB)  

    The paper describes the design features and performance of single-phase switched reluctance motors for low-power variable-speed drives. The main advantages of these motors lie in their simple robust construction and low manufacturing cost. Experimental results from two prototypes are given, showing satisfactory performance. View full abstract»

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  • Static frequency convertor for supplying an asynchronous two-phase motor

    Page(s): 57 - 60
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (386 KB)  

    In the paper, a static frequency convertor with inverter based on the amplitude modulation of the output voltage pulses for supplying asynchronous two-phase motor is presented. The operating principle of an inverter with a high fundamental content output voltage is described, and the higher harmonics spectrum of the output voltage is analysed. View full abstract»

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