Stepper motor current question. 3.9 A per motor or per coil

This forum is dedicated to those Hobbyists Interested in CNC machining in their home shops. (Digital Read Outs are also topical, as is CAD/CAM as it relates to CNC)

Moderator: Harold_V

Post Reply
dorin
Posts: 516
Joined: Thu Nov 28, 2002 5:24 am

Stepper motor current question. 3.9 A per motor or per coil

Post by dorin » Mon Sep 29, 2014 7:48 am

I have several 23D-6108A steppers.
I guess they are now known as 23D108S from Anaheim Automation.

http://www.anaheimautomation.com/produc ... =74&cID=19

Rating on the outside of the stepper motor is 3.9A.

Can I assume that is for the whole motor? Or is it per coil?

Thank you,
Mike
www.chaski.com

User avatar
Dave_C
Posts: 910
Joined: Mon Apr 21, 2008 10:34 am
Location: Springfield. MO.

Re: Stepper motor current question. 3.9 A per motor or per

Post by Dave_C » Mon Sep 29, 2014 8:08 am

Mike,

In all my research I've not seen any rated per coil. Just amp draw on the motor as a whole.

Dave C.
I learn something new every day! Problem is I forget two.

hammermill
Posts: 2938
Joined: Sun Jun 27, 2010 10:43 pm
Location: pendleton or

Re: Stepper motor current question. 3.9 A per motor or per

Post by hammermill » Tue Sep 30, 2014 9:34 am

review how a stepper motor operates. as to produce one step, then the next set of coils is energized , so each coil set will draw the rated current and is the same as the motor rating.

this video by texas instrument will help your understanding
https://www.youtube.com/watch?v=bngx2dKl5jU

User avatar
oldvan
Posts: 553
Joined: Mon May 05, 2008 6:46 pm
Location: Western NY USA

Re: Stepper motor current question. 3.9 A per motor or per

Post by oldvan » Tue Sep 30, 2014 1:32 pm

The video would have been better if the author understood and demonstrated that movement is a tooth at a time instead of speaking incorrectly that an A to B transition would be 45 degrees.

User avatar
ctwo
Posts: 2560
Joined: Tue Mar 27, 2012 12:37 pm
Location: Silly Cone Valley

Re: Stepper motor current question. 3.9 A per motor or per

Post by ctwo » Tue Sep 30, 2014 2:58 pm

My motors can be wired in series or parallel, so that affects the current rating. The spec on the motor in question (the 23D108S anyway) appears to be 2.7A bipolar series RMS current and you are already wired in series with a center tap.
Standards are so important that everyone must have their own...
To measure is to know - Lord Kelvin
Disclaimer: I'm just a guy with a few machines...

Post Reply