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# [femm] Re: DC MOTOR DESIGN BOOKS

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- Subject: [femm] Re: DC MOTOR DESIGN BOOKS
- From: Dcm3c@aol.com
- Date: Tue, 2 Nov 1999 10:31:52 EST
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    In a message dated 11/1/99 3:54:05 PM Eastern Standard Time,
    tsiporak@hotmail.com writes:

    > I am looking for "old" books for DC Motor design calculation, such as
    > number of poles, number or turns per coil, number and sizes for iron
    > sheets, etc. I know that I can FEA analysis but to better get the
    > "feeling" for the basics of motor physics. I am looking for books and
    > or articles published upto the 1970's before DC motor designers had the
    > FEA tools. Any help will be appreciated/

    Check out the on-line book, Vector Control of Induction Machines, at:

    ftp://murray.newcastle.edu.au/pub/reb/elec414_material/Notes/Elec414Notes.pdf

    Although its title says "induction machines," there is a very good section at
    the beginning that talks about modeling of DC machines, and especially the
    assumptions that you make in reducing them to a form that is easy to model.

    As far as physical books, try:

    G. Selmon, "Electric Machines and Drives," Addison-Wesley, 1992

    which is a pretty comprehensive book.

    Another nice tool that is useful in practice is the program Wiretron, freely
    available at:

    http://www.wiretron.com/free.html

    This program contains a lot of practical information about wire sizing,
    current capacity, different types of insulation, etc, etc.

    As far as stuff like laminations and magnets, the only good source of
    information is manufacturer's spec sheets. Unfortunately, these guys don't
    seem to be very webified yet, or maybe I'm just not aware of where this
    information resides.

    This is sort of a peeve of mine: finite element are a useful tool to motor
    designers, but it's generally a very bad idea to use _just_ finite elements.
    It's generally the most productive to do a design using an analytical
    approach, and then use finite elements to look at the design and investigate
    the effects that you might neglect when making the analytical models (like
    saturation, higher order harmonics, and so on). Another good use of FEA is
    to use finite element models to obtain parameters that are used in analytical
    models, but which are hard to calculate by hand. I use this trick a lot, too.
    The problem with using only finite elements is that the design ends up being
    sort of a numerical version of cut-and-try. Since you don't have any insight
    into _why_ the model is doing what it is doing, your only recourse is many
    iterations of making changes to the design and re-running the model until you
    get what you want. Typically, there are too many parameters that describe
    any given machine to do this effectively.

    Dave.

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