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How Can A High-Torque Motor Have Low a low RPM

by 012anonymousx
Tags: hightorque, motor
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012anonymousx
#1
Jan9-13, 09:01 PM
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Torque is the rotational force.
If there is more force, how can the motor be slow?

I'm building a DC motor and read that given a constant amount of coil, creating a very dense coil will increase torque but lower RPMs.
Conversely, making it looser (bigger radius) increases RPM but lowers torque.
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Simon Bridge
#2
Jan9-13, 10:07 PM
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The torque gives you acceleration - but it is possible to accelerate to any speed... however slow.

For your motor - it will accelerate to a constant speed due to losses that are proportional to speed. This will be proportional to the amount of mass that has to be spun - and so is the torque.
rcgldr
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Jan9-13, 11:41 PM
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The increase in torque at lower rpm is offset by increase in back emf at higher rpm, which decreases the torque at higher rpm.

russ_watters
#4
Jan10-13, 05:23 AM
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How Can A High-Torque Motor Have Low a low RPM

Motors are connected to loads. The load determines the ratio between RPM and torque. If a "high torque" motor is not connected to a load and is just allowed to freewheel, it does not produce any torque.


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