Author Topic: What is NEMA?  (Read 5661 times)

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Offline eeguyTopic starter

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What is NEMA?
« on: January 25, 2024, 07:15:20 pm »
Hi, I came across some projects that use NEMA 17 or NEMA 23 motors. What does NEMA mean? Is it a some kind of standard to distinguish among motors of different sizes?
 

Offline DimitriP

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Re: What is NEMA?
« Reply #1 on: January 25, 2024, 07:23:46 pm »
Yes!
   If three 100  Ohm resistors are connected in parallel, and in series with a 200 Ohm resistor, how many resistors do you have? 
 

Offline Veteran68

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Re: What is NEMA?
« Reply #2 on: January 25, 2024, 07:52:08 pm »
With the handle 'eeguy' and based in US, I have to believe you know what NEMA is?

As to why stepper motors are referred to in NEMA terms: https://reprap.org/wiki/NEMA_Motor

Quote
The US-based National Electrical Manufacturers Association creates standards that are developed by the manufacturers through a voluntary consensus to provide descriptions of how things should be. NEMA ICS 16-2001 (Motion/Position Control Motors, Controls, and Feedback Devices) describes stepper motors and is the NEMA standard usually referred to when talking about the NEMA standard in the context of RepRap, stepper motors and 3D printers.

In section 4.3.1.1 of that standard, NEMA chose to label stepper motors (e.g. "NEMA 17") with the size of their faceplate in tenth of inches. So a "NEMA 17" has a 1.7 inch by 1.7 inch faceplate. By standardizing the stepper motors (the faceplates, flanges and screw holes), you know ahead of time that one NEMA 17 motor will fit into the mounts of another NEMA 17 without having to redesign anything. This makes swapping components easier.

The first working RepRap used NEMA 23 Stepper motors for positioning and a different kind of motor for the extruder. As of 2013, most RepRap designs call for NEMA 17 Stepper motors or NEMA 14 Stepper motors for both positioning and extruding.
 

Offline DimitriP

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Re: What is NEMA?
« Reply #3 on: January 25, 2024, 07:57:41 pm »
So...still "Yes".

   If three 100  Ohm resistors are connected in parallel, and in series with a 200 Ohm resistor, how many resistors do you have? 
 

Offline xrunner

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Re: What is NEMA?
« Reply #4 on: January 25, 2024, 08:20:11 pm »
Hi, I came across some projects that use NEMA 17 or NEMA 23 motors. What does NEMA mean? Is it a some kind of standard to distinguish among motors of different sizes?

 :-//

https://www.nema.org/about

 ::)

 :-\
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Offline MarkT

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Re: What is NEMA?
« Reply #5 on: January 27, 2024, 10:58:24 am »
Its actually less work to ask a search engine this than a forum, and the answer comes back quicker...
 
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Offline drago462

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Re: What is NEMA?
« Reply #6 on: February 21, 2024, 07:28:36 am »
NEMA 17 refers to it having a 1.7" x 1.7" frame.
 

Offline beanflying

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Re: What is NEMA?
« Reply #7 on: February 21, 2024, 07:37:16 am »
Like all standards it has also been bastardized so pick an item with care in particular when it comes to the shaft dimension and if it is metric or imperial and is the key 'standard' or 'special' :palm:

In theory as others stated it 'generally' means frame size but there is a huge level of variations from there. Take a glance here and do a search for hybrid nema 17 steppers there is dozens to filter down https://www.omc-stepperonline.com/hybrid-stepper-motor?mfp=184-frame-size-mm[Nema%2017%20(42%20x%2042)]
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Offline MarkT

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Re: What is NEMA?
« Reply #8 on: February 21, 2024, 10:23:35 pm »
BTW standard NEMA sizes for steppers are 8,11,14,17,23,34,42
 

Offline jotalepe

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Offline coppercone2

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Re: What is NEMA?
« Reply #10 on: May 20, 2024, 04:08:32 am »
its a organized crime group


their thing is if you drill the holes in the correct orientation your piece of shit motor becomes 'industrial grade'  (similar to craniology)

the question you should be asking is "what's in the box?!"

I say this because people will advertise products as having "NEMA RATED MOTORS". It does not mean much.
« Last Edit: May 20, 2024, 04:13:41 am by coppercone2 »
 


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