Resistor for unknown nema 23

[cncneon]

is it possible to guess the resistor value for a G540 if the steppers are unknown nema 23?
hobby machine, limited use, would I be better off just letting em run hot?
Bob

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[phomann]

Hi Bob
If is better to run them at there rated current. If they are overdriven the excess heat can eventually damage the motor. Also you will get better speed performance by not overdriving them.
Do the motors have any markings on them as you may be able to determine the rated current from that?
Also what is the length of the motor body? That will determine if it is a single or double stack motor.
The shorter single stack motors don’t usually draw more than 2.8A. So that may help.
Consider using a set of these DB-9 breakout boards. They allow you to easily set the current without having to solder in resistors as they have an inbuilt adjustable potentiometer.

https://www.homanndesigns.com/index....roducts_id=111

Cheers
Peter


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[cyclestart]

Buying a known set of motors would be a better bet than suboptimal performance and even possible damage. I seem to remember Gecko mentioning the resistors must be used with some motors though that may not mean possible damage to the G540 itself.

If you measure the resistance of a motor coil it may be possible to search for a motor with the same resistance as well as length and weight. My guess is the amps will be close to the motor you have. BUT that is a guess and I'm an idiot where electrons are involved.

[phomann]

You don’t need the resistors, but if they are not used, the G540 will deliver the 3.5A to the motor.
Additionally, the drive won’t drop the current to the motor when it is idle.
Cheers
Peter.


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