Electric motors newbie questions

Hello, I'm a newbie and I'd like to learn a little about electric motors.

I've had a run-through of electric motors and I understand the basics (how they work, that they are an inductive load, etc), but I've got a few questions:

  1. Is there an easy equation or way to find the torque that the the motor will give out for a given load and voltage/current etc?

  1. What information is understood from a motor constant and how is this found for an arbitrary motor (say, one that I've aquired and wish to understand but have no spec sheet for)

  2. What is a blocked rotor test (besides some sort of test that is done while blocking the rotor.. I.e. what is measured?) and what is understood from this?

Maybe I'm just not looking in the right places, but I can't seem to find any plain English information on this. If someone could even point me to a good website or something I'd be extremely thankful.



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I assume you are interested in dc motors with brushes? And permanent magnets or wound field? Or brushless? Or ac? Are you interested in design rules of thumb... how to pick the right speed/torque/power for a certain application? I guess we all assume the basics.... watts is volts x amps and power is torque x speed. More volts -> more amps. More amps-> more torque.

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UR intrested in DC well the moter principle is deprnds on

T=rXp (torque=rdies x power) Same principle applicable here The total ac mesured in P=IxV so in moter the magnatic brush produce required power as above explination.

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