What is torque in electric motors?

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Sunturday
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What is torque in electric motors? And why is it largest when a single armature is horizontal to the field?
 
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Torque is the power of the motor divided by the RPM. When the load on the motor increases, it becomes difficult to rotate the load at the same RPM as the lesser load before. More torque is required and the RPM decreases.

Not the best of explanations, but i hope you got an idea.

Don't quite remember the second part. I'll check if I can find anything.
 

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