[dazp1976]

Hey all,

First post! Whoot! Long time lurker though.

I have been researching my build for a few months now and am getting hung up on nema motor inductance. How do these two compare:

Motor 1:
Holding Torque 1.9Nm(269oz.in)
Rated Current/phase 2.8A
Phase Resistance 1.13ohms
Voltage 3.2V
Inductance 5.4mH±20%(1KHz)
Weight 1.1kg

Motor 2:
Holding Torque 1.9N·m (269oz·in)
Rated Current/phase 3.0 A
Phase Resistance 1.2 ohms
Rated Voltage (?driving voltage) 3.6 V
Inductance 3.7 mH ±20%
Weight 1.1 kg

So I know the second is better as it can be driven faster and with more torque with comparable voltage. I just need an equation or some way to know HOW MUCH BETTER and where/when.

Inductance section of this was helpful but I was getting weird results and no way to compare the results.
https://www.duet3d.com/wiki/Choosing...ors#Inductance

Constants:
36v power supply
Tb6600 or similar driver
1605 ballscrews
27" x 33" cutting area
Home built grbl controller
Dual y axis (4 motors total)
Use: Mostly wood working with a bit of plastic and al.
Me: technical and a woodworker, NO electrical or engineering background so 5yo version please.

Thanks all!
Happy to be here!

They're both pretty frikkin high inductance to me for that size torque. Stepper online's garbage by any chance?
Personally from my limited experience, when it comes to driving 1605 ballscrews I'd be looking at something like these:

https://www.automationtechnologiesin...flat-570-oz-in
These have 2.5mh inductance and I've seen them widely used around the forum on many different types of machine. Ran from 60V PSU's and drivers, and they fly.
http://www.automationtechnologiesinc...ownload/17251/
http://www.automationtechnologiesinc...ownload/14762/

I wouldn't touch less than 425oz/in for 1605. I've also ran on 36V when I started out and had nothing but grief with stalling, crap accel, low top rpm etc etc.
Don't waste your time and money. Get it reliable first time!!!!

As I live in the u.k. I was a bit limited with what I could get due to ridiculous import charges and the like. On my mill machine I've ended up with 566oz, 5A, 3mh Nema 24 size steppers running on 60V. I had to shop/search around a fair bit to find what I wanted as close as possible to the above. I am happy and wouldn't have anything less again!


If mine ever cop out. I reckon these will be my next:
https://www.aliexpress.com/item/1005...160c3421Llz8x3
https://www.aliexpress.com/item/1005...archweb201603_
Run from a 60VAC toroidal.