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IEE Colloquium on Advances in Control Systems for Electric Drives

24 May 1995

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Displaying Results 1 - 12 of 12
  • Extending the performance limits of vector controlled AC drives

    Publication Year: 1995, Page(s):4/1 - 410
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (340 KB)

    A range of industrial vector controlled inverter drives is now available for operation at power levels from 5 kW to 1 MW. The entire product range uses insulated gate bipolar transistors (IGBTs) as the power switch in a 3 phase voltage source bridge configuration. The drives provide full four quadrant operation through sinusoidal, line regenerative network bridges which are themselves identical IG... View full abstract»

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  • Control of a brushless DC motor using a torque vector method and modulated conduction

    Publication Year: 1995, Page(s):10/1 - 10/4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (184 KB)

    The research work described in this paper was carried out on a brushless DC motor with airgap windings and surface permanent magnets. In a previous research programme, robust speed or position control was achieved using a sliding mode method. However, the scheme suffered from certain disadvantages: the hardware scheme was relatively complex, the period for calculation of speed and acceleration fro... View full abstract»

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  • A new direct torque control strategy

    Publication Year: 1995, Page(s):5/1 - 5/4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (212 KB)

    The paper investigates the performance of three-phase cage rotor induction motor control systems based on direct torque control. Direct torque control is examined and it is found that this scheme is less complex and gives better control characteristics than the vector control methods. A new control strategy based on direct torque control is then considered in detail. It has been found that the per... View full abstract»

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  • Improvements in operation of vector controlled induction machines by application of modified machine models

    Publication Year: 1995, Page(s):3/1 - 3/8
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (324 KB)

    The theory of induction machine vector control is based on constant parameter induction machine d-q axis model that neglects all the parameter variations, flux saturation and iron core loss. Due to inevitable variation of parameters during operation of the drive, actual performance may significantly deteriorate from ideal. In general, two approaches may be identified as being available to combat t... View full abstract»

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  • Steady state efficiency of a synchronous reluctance drive

    Publication Year: 1995, Page(s):11/1 - 11/5
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (208 KB)

    The performance of a synchronous reluctance drive can be optimised with regard to such parameters as power factor and transient response (or rate of change of torque). Constant current in inductive axis control yields the best transient response and is often termed vector control. A number of control schemes have been proposed and research effort has neglected to consider the effect of these schem... View full abstract»

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  • Soft-computing in the control of electrical drives

    Publication Year: 1995, Page(s):9/1 - 9/6
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (248 KB)

    The principal constituents of soft computing are the fuzzy logic (FL), artificial neural networks (NN) and probabilistic reasoning (PR). It is generally regarded that FL primarily deals with imprecision, NN with learning, and PR with uncertainty. They have, however, overlapping boundaries and are known to be complementary rather than competitive to each other in many applications. Here, two contro... View full abstract»

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  • Application of encoderless vector control techniques in a medium performance induction motor drive

    Publication Year: 1995, Page(s):2/1 - 2/4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (184 KB)

    This paper looks at the application of encoderless vector control in medium performance induction motor drives. In recent publications some attention has been given to methods which utilize adaptive flux observers to identify rotor speed. This paper evaluates some of these techniques with particular focus on their application in a single processor drive. The authors discuss three MRAC (model refer... View full abstract»

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  • A comparison between fuzzy and linear controllers applied to a switched reluctance motor based position servo

    Publication Year: 1995, Page(s):8/1 - 8/4
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (192 KB)

    Position control of a switched reluctance motor based on exact input-output linearisation of its torque production characteristics, in an inner control loop, and a simple sliding mode outer control loop using fuzzy logic has been demonstrated. Experimental results confirm the anticipated behaviour of this scheme. The exercise has highlighted some of the advantages of fuzzy systems, notably their f... View full abstract»

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  • Combined drive/chargers for electric vehicles: advanced technology to “side-step” the batteries

    Publication Year: 1995, Page(s):1/1 - 1/7
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (268 KB)

    The author describes how powerful technologies can be brought to bear to “side-step” the shortcomings of present electric vehicle secondary batteries in some respects. He details how combined drive/charger products are now beginning to become available to the standards the automotive industry expects. These units are offered with battery ratings up to 700V DC, and output currents to 35... View full abstract»

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  • Flux oriented control without using rotor time constant and stator resistance

    Publication Year: 1995, Page(s):7/1 - 7/4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (160 KB)

    Flux oriented control systems of induction machines are sensitive to the variation of the machine parameters such as rotor time constant and stator resistance. Speed estimation has been proposed by many papers however they depend on the variation in rotor time constant and stator resistance. A system that has speed estimation and is also independent of rotor time constant and stator resistance is ... View full abstract»

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  • IEE Colloquium `Advances in Control Systems for Electric Drives' (Digest No. 1995/114)

    Publication Year: 1995
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (40 KB)

    The following topics were dealt with: electric vehicles; induction motor drives; vector control techniques; AC drives; torque control; flux oriented control; switched reluctance motor based positron servo control; brushless DC motor control; synchronous reluctance drive View full abstract»

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  • A unified drive-how and why?

    Publication Year: 1995, Page(s):6/1 - 6/4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (172 KB)

    Some manufacturers offer a range of similar variable speed drives to cover a range of applications and motor types so that their customers do not have to be familiar with several different products. The set-up and control of drives is never the same throughout a range and the user must keep several sets of different spares. A unified drive which incorporates the necessary power and control element... View full abstract»

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