Author Topic: advice, which step motor driver?  (Read 1625 times)

0 Members and 1 Guest are viewing this topic.

Offline legacyTopic starter

  • Super Contributor
  • ***
  • !
  • Posts: 4415
  • Country: ch
advice, which step motor driver?
« on: June 12, 2018, 05:52:39 pm »
hey guys?
between lv8729 and tmc-2130, what do you suggest?

(if the answer is "none" of the two, please address me to the right one)

micro-stepping is in the requirement's list
 

Offline nctnico

  • Super Contributor
  • ***
  • Posts: 26906
  • Country: nl
    • NCT Developments
Re: advice, which step motor driver?
« Reply #1 on: June 12, 2018, 06:03:39 pm »
Be careful: stepper motors aren't as ideal to use as you might think. A servo motor with an absolute encoder might be a better solution. You'll need the absolute encoder anyway to verify the position of the stepper motor.
There are small lies, big lies and then there is what is on the screen of your oscilloscope.
 

Offline IonizedGears

  • Regular Contributor
  • *
  • Posts: 248
  • Country: us
Re: advice, which step motor driver?
« Reply #2 on: June 12, 2018, 06:06:47 pm »
What are you using them for? Are you putting it in a 3d printer/cnc with direct belt drives or in a system with lead screws that have drive ratios higher than 1? By drive ratios I mean ratio between revolutions of the stepper motor and carriage movement. (e.g. 4 rev / mm)

IX
« Last Edit: June 12, 2018, 06:08:36 pm by IonizedGears »
I am an EE with interests in Embedded, RF, Control Systems, and Nanotech.
 

Offline ajb

  • Super Contributor
  • ***
  • Posts: 2601
  • Country: us
Re: advice, which step motor driver?
« Reply #3 on: June 12, 2018, 07:15:06 pm »
Be careful: stepper motors aren't as ideal to use as you might think.
  Yes, and how close to ideal a motor is can vary quite widely.  I've just been doing some testing for a project and I've observed a shocking difference in performance between a random NEMA 17 stepper from Amazon and one of Trinamic's microstepping-optimized motors, particularly in position ripple with 256x microstepping. 

I'm using one of Trinamic's integrated controller+driver chips and like the TMC2130 it has a programmable step sequencer.  That allows you to customize the shape of the current waveform through a full step, to help compensate for much of the non-ideal character of cheaper motors.  It's a bit tricky to program because of the way the table is compressed, and I've found a couple of table settings that seem to cause it to lose its shit, but once you get it figured out it helps a LOT.  There's an appnote and a spreadsheet you can get from Trinamic to help calculate the curve, and it's fairly easy to add a few fields to make it spit out the table register values so you can just copy and paste them into your initialization code.

So, generally, if you're interested in fine microstepping and are willing to put some time into calibrating the driver against the motors, I'd definitely recommend the Trinamic part. 

But really, to get good advice you're going to have to tell us about your application.
 

Offline legacyTopic starter

  • Super Contributor
  • ***
  • !
  • Posts: 4415
  • Country: ch
Re: advice, which step motor driver?
« Reply #4 on: June 12, 2018, 07:16:22 pm »
What are you using them for? Are you putting it in a 3d printer ... ?

yes, 3d printer  :D
 

Offline legacyTopic starter

  • Super Contributor
  • ***
  • !
  • Posts: 4415
  • Country: ch
Re: advice, which step motor driver?
« Reply #5 on: June 12, 2018, 07:19:01 pm »
have to tell us about your application.

Going to design a 3d printer with the smoothest moves possible.

 

Offline nctnico

  • Super Contributor
  • ***
  • Posts: 26906
  • Country: nl
    • NCT Developments
Re: advice, which step motor driver?
« Reply #6 on: June 12, 2018, 08:33:07 pm »
have to tell us about your application.

Going to design a 3d printer with the smoothest moves possible.
Definitely go for servo motors.
There are small lies, big lies and then there is what is on the screen of your oscilloscope.
 

Offline tpowell1830

  • Frequent Contributor
  • **
  • Posts: 863
  • Country: us
  • Peacefully retired from industry, active in life
Re: advice, which step motor driver?
« Reply #7 on: June 12, 2018, 10:02:22 pm »
Take a look at Marco REp's video and he starts talking about a special stepper motor circuit/device around 7:20.



Hope this helps...
PEACE===>T
 

Offline legacyTopic starter

  • Super Contributor
  • ***
  • !
  • Posts: 4415
  • Country: ch
Re: advice, which step motor driver?
« Reply #8 on: June 13, 2018, 08:02:25 am »
Definitely go for servo motors.

Which one do you suggest to look at?
 

Offline legacyTopic starter

  • Super Contributor
  • ***
  • !
  • Posts: 4415
  • Country: ch
Re: advice, which step motor driver?
« Reply #9 on: June 13, 2018, 08:03:16 am »
Take a look at Marco REp's video and he starts talking about a special stepper motor circuit/device around 7:20.

Hope this helps...

Wow, awesome! Thanks!
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf