# Thread: Nema 23 at 12V and 1/4in di shaft??

1. ## Nema 23 at 12V and 1/4in di shaft??

Hello,

I recently got some Nema 17s that run at 12V with my driver and 12V power supply.. However I need some more torque and a stepper with a 1/4in diameter shaft to work with my setup...

Is there Nema 23's or 24's that run at 12V (hard to find) and (this is what i'm not understanding) lots of listing I see for Nema XX do not list the Voltage... so I'm kinda new to all this... Any pointers in getting a bigger stepper that will work with my 12V setup that has a 1/4 di shaft would be appreciated...

Thanks
Shane

2. Typical motors may have a voltage rating of perhaps 2 to 5 volts, however that may not be the actual voltage at which the motors are operated. Normally the driver used with such motors applies a higher voltage than the rated voltage, but regulates the current (for example, through "chopping" of the power supplied to the motor) to keep the current within the motor's rating.

For example, this 4-wire motor has a 2.55 volt rating and has a holding torque of 381 oz-in (which is substantially more torque than you will find in a NEMA 17 size motor):

http://www.kelinginc.net/KL23H2100-35-4B.pdf

Also, this 8-wire motor has different voltage ratings depending on the hookup type, ranging from 1.93 to 3.86 volts, with a holding torque ranging from 200 to 282 oz-in:

http://www.kelinginc.net/KL23H276-30-8A.pdf

So, while I do not know what type of driver you are using, my guess is that if you are driving NEMA 17 motors at 12 volts with it, then it is a type of driver that is performing current limiting, and you should be able to drive a NEMA 23 motor with it. The question that will arise, however, is how much current your driver is designed to deliver compared with the current rating of the motor that you intend to use with it. If your driver can not supply sufficient current to the motor, then you will not achieve the ultimate torque that the motor is capable of providing.

As far as voltage, using a higher voltage than 12 volts would permit your motor to achieve higher torque at higher speeds. The inductance of the motor winding is also a factor that affects the ultimate motor speed based on the supplied voltage. However your question said nothing about speed, rather your concern was about torque.

3. 12v won't give you much performance, no matter what motor you use. You need around 30v or more, regardless of the motor's voltage rating. But make sure it's about 10v below the max rating of your drive.

4. Originally Posted by sweddle
Hello,

I recently got some Nema 17s that run at 12V with my driver and 12V power supply.. However I need some more torque and a stepper with a 1/4in diameter shaft to work with my setup...
Keling sells Nema 17 steppers with 1/4" shafts. I actually have 4 of them. See the data sheet for torque specs.

• Thanks for all the info and help, I'm gonna get some 23s and 17s with 1/4 in shaft and see how they work.