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speed related to torque

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How is speed of a dc motor related to torque.

torque is inversely proportional to the speed.
the motor's data sheet usually has a torque/speed graph.

any body have any idea about voltage/amperage to speed/tourqe.
I know that a motor uses more amps to use more tourqe but... any thing else we should know?

just some useful stuff:

voltage is proportional to speed
torque is proportional to the armature current
torque is proportional to (output power/speed)
Horsepower=(torque * speed)/5252
also there are series, shunt, and compound DC motors. each have slightly different characteristics. for example: series motors have better start up torque and shunt has better torque vs speed characteristics.

brushless? ???


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