Stepper stall / load detection - Electronic Circuits Projects Diagrams Free

Kyle-s4h · 27th November 2007, 02:04 AM

..........

Kyle-s4h · 27th November 2007, 06:01 PM

Well, I'm glad to see there wasn't 10 replies in the first hour -- this just tells me that the question confuses the rest of you as much as it does me -- and, well, now I don't feel so stupid!

blueroomelectronics · 27th November 2007, 06:19 PM

I see Creatron has a L298 handwired there. Is that yours

?

matc · 28th November 2007, 01:01 AM

I'm no expert but ....
- Back emf is tough to detect reliably for slow moving things like this.
- Current isn't hard to detect, but for steppers isn't a good indication of stall since they operate at low speed and continuous high current anyway.

Other ideas....
- Sacrificial mechanical link?
- Detect torque mechanically? (Easiest way to do this is to let the stepper flex and detect how far it moves)
- Position feedback? (optical encoder - compare where you think it is to where it really is - cut out if too far out of alignment).

Kyle-s4h · 28th November 2007, 03:46 AM

Quote:

Originally Posted by blueroomelectronics

I see Creatron has a L298 handwired there. Is that yours

?

Nope, not mine -- I thought it was yours.

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27th November 2007, 02:04 AM	(permalink)
Kyle-s4h	Stepper stall / load detection .......... Last edited by Kyle-s4h; 6th January 2008 at 02:24 PM.

27th November 2007, 06:01 PM	(permalink)
Kyle-s4h	Well, I'm glad to see there wasn't 10 replies in the first hour -- this just tells me that the question confuses the rest of you as much as it does me -- and, well, now I don't feel so stupid!

27th November 2007, 06:19 PM	(permalink)
blueroomelectronics	I see Creatron has a L298 handwired there. Is that yours ? __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com

28th November 2007, 01:01 AM	(permalink)
matc	I'm no expert but .... - Back emf is tough to detect reliably for slow moving things like this. - Current isn't hard to detect, but for steppers isn't a good indication of stall since they operate at low speed and continuous high current anyway. Other ideas.... - Sacrificial mechanical link? - Detect torque mechanically? (Easiest way to do this is to let the stepper flex and detect how far it moves) - Position feedback? (optical encoder - compare where you think it is to where it really is - cut out if too far out of alignment).