I have a 4-wire stepper motor that I salvaged and I would like to use in a project. I cannot find the rated current limit for it. The motor is NEMA 23 and has the following info on a label:
07-0716-00
STP-58D3019
1.4 ohms
25171
I've seen this motor all over the web but I cannot find the maximum current rating and I'm trying to set the Vref to use with the A4988 driver. Any help is welcome.
Using Google this comes up: Asymtek 07-0716-00 Step Motor, STP-58D3019 – PFIParts (pfipartsus.com)
Contacting them is worth trying.
NEMA 23 tells M4 screws are used for mounting it and it also tells a certain hole pattern is used.
Being conservative I say that 0.5 Amp is safe, likely 1.0 Amp. Maximum can be somewhere around 1.5-1.6 Amp. Start low and monitor the stepper temperature. They do get warm but not untouchably hot.
Thanks for the reply. I saw the same contact site but I have not tried to contact them.
I have a similar motor STP-59D1006 with a label saying “Shinano Kenshi Co. I’ll see if they have info.
Industrial steppers are designed to run hot, so a current where the motor casing does not exceed about 80 C at steady state is OK.
Sounds like a good thumb of rules. Many motors manage quite a lot of temperature but avoiding them glowing is a good idea.
A NEMA23 that size would have I-squared-R around 7W or so, indicating about 2.2A for a winding resistance of 1.4. Just monitor the temperature in case its excessive.
Thanks for the input.
I sent email to the mfg but never got a reply.
I'm going with 1.0-1.5 amps and monitor the heat.
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