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DC motor 'rules of thumb'?

Discussion in 'Electronic Basics' started by BobG, Aug 6, 2005.

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  1. BobG

    BobG Guest

    Anyone know of a site that describes DC motor tradeoffs? I know torque
    is proportional to current and turns, and there are practical problems
    with wire size and resistance that limit number of turns, etc. Lets say
    I have a 3 pole armature and a 7 pole armature wound with the same
    number of turns and wire size. Will they have the same torque? Which
    one will have greater rpm? I know the inductance goes up with turns.
    Seems like there should be a rule about L/R time constant and RPM
    somewhere in the rule of thumb list. Some big hefty motors cant be PWMd
    faster than a kilohertz or so... is this because of large L?
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