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Computer-aided Design of Electrical Machines

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    Vishnu Murthy, K. M., "Computer-aided Design of Electrical Machines"
    BS Publications | 2008 | ISBN: 144166159X, 8178001462 | 335 pages | PDF | 11 MB

    Concept of Computer-Aided Design and
    1.1 Introduction
    A design problem has to be fonnulated considering the various constraints, processes,
    availability of materials, quality aspects. cost aspects etc. Constraints can be from
    technical, cost or availability aspects. Technical constraints can be from calculation
    methods, available process systems, skilled labour, manufacturing facilities, machinery,
    or tools etc. Sometimes transport facilities to site also pose problems. If suitable quality
    . materials are not available indigenously they may have to be imported, which effects
    cost and delivery time.
    In designing -any system, accuracy of prediction, economy, quality and delivery
    period playa vital role. Basically, a design involves calculating the dimensions of
    various components and parts of the machine, weights, material specifications, output
    parameters and perfonnance in accordance with specified international standards. The
    calculated parameters may not tally with the final tested perfonnance. Hence, design has
    to be frozen keeping in view the design analysis as well as the previous operating
    experience of search machines.
    The practical method in case of bigger machines is to establish a computer program
    for the total design incorporating the constraint parameters and running the program for
    various alternatives from which final design is selected.
    Though the final design may meet all the required specifications, it need not be an
    optimal one as regards the weight and cost of the active materials, and certain
    perfonnance aspects like efficiency, temperature rise etc.
    Various Objective Parameters/or Optimization in an Electrical Machine
    (a) Higher Efficiency
    (b) Lower weight for given KVA output (Kg/KVA)
    (c) Lower Temperature-Rise
    (d) Lower Cost
    (e) Any other parameter like higher PF for induction motor, higher reactance etc.
    Here we have to understand that if an optimized design is finalized keeping in view
    of any of the parameters mentioned above, the design may not be optimum for the above
    parameters. For example, if a design is selected for higher efficiency, it may not be
    optimum in other parameters, maybe the cost is high. Nonnally this is a case where...



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