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Ask Slashdot: Using electric motors to simulate weight training

ShadowBot (908773) writes | about 2 years ago

Hardware 2

ShadowBot (908773) writes "Hello. I'm currently working on a mod project that involves being able to generate different amounts of weight on the fly for something similar to an exercise machine.
My current research is pointing me towards a Torque motor, as a motor that can continuously apply torque even when it is being prevented from moving.
However, will it be able to continue applying this torque even when the rotor is being forced to rotate in the opposite direction to the that the motor is trying to move it in?
Also, is it possible to vary the amount of torque being applied to simulate different weights?

The goal is not just to provide resistance to movement, but to actually simulate a weight which wants to drop to the floor while the user is pulling it in the opposite direction.


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That would describe... (1)

Deadstick (535032) | about 2 years ago | (#42172483)

...a simple DC motor. It delivers its max torque at zero speed. However, you couldn't use just any old motor: in the "stall" condition it also draws maximum current, and most motors aren't designed to take the resulting heat load for more than a few seconds. One way around this would be operating the motor at less than its rated voltage.

If you "back-drive" a DC motor, you'll actually have to apply more than the stall torque, but if you're turning it at a speed much less than the free-running speed it will only be a small increase.

Voltage/current/torque relations for DC motors: []

Re:That would describe... (1)

ShadowBot (908773) | about 2 years ago | (#42179031)

Thanks Deadstick.
That link is really helpful. :)

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