Recently I installed Leadshine's nema 34 stepper with integrated encoder,
driver used is also from Leadshine, and it is driven by Pico system's Universal
Stepper Controller to which is also attached encoder feedback, so system is in
close loop and it works very good. One thing I like about Leads
On 01/19/2016 01:04 AM, Chris Albertson wrote:
> I've read that it is hard to use steppers for closed loop CNC. If this is
> still true could some one explain the theory.
Stepper drivers have fixed current settings for the
windings. When the load increases, the voltage applied by
the driver may
On 1/19/2016 5:19 AM, andy pugh wrote:
> On 19 January 2016 at 07:04, Chris Albertson
> wrote:
>> I've read that it is hard to use steppers for closed loop CNC. If this is
>> still true could some one explain the theory.
> This may be a misunderstanding.
> It is hard to do anything useful with a
On Tuesday 19 January 2016 06:31:10 andy pugh wrote:
> On 19 January 2016 at 11:14, Lester Caine wrote:
> > The newer 'closed loop' motors are essentially using the same
> > approach, but rather than simply applying the same power for longer
>
> I don't think that this is what the original poster
On 19/01/16 11:31, andy pugh wrote:
>> The newer 'closed loop' motors are essentially using the same approach,
>> > but rather than simply applying the same power for longer
> I don't think that this is what the original poster was asking. I
> think he was just wanting to close a position loop with
Gentlemen,
Having no experience with steppers I will still offer my opinion. Take it
as you will. :)
The case for steppers seems to hinge on cost ie: steppers are less
expensive than servos.
Steppers cannot maintain position like servos because of the aforementioned
lack of increased power if t
On 19 January 2016 at 11:14, Lester Caine wrote:
>
> The newer 'closed loop' motors are essentially using the same approach,
> but rather than simply applying the same power for longer
I don't think that this is what the original poster was asking. I
think he was just wanting to close a position
On 19/01/16 10:33, Gene Heskett wrote:
> Something that has not been mentioned here is that a real error because
> the stepper has lost a full step or more because it is being asked for
> step movement faster than it can maintain lock.
>
> When that occurs, generally the motor stops/locks, and t
On 1/19/2016 3:33 AM, Gene Heskett wrote:
> 2 optos in series because the BoB you bought is also an isolated version,
> _will_ hurt you. Particularly if using a PWM output for spindle speed
> control, you _WILL_ have to get rid of it if you want anything that even
> resembles linear speeds so the
On Tuesday 19 January 2016 03:35:32 John Dammeyer wrote:
> Hi Chris,
> Wiki defines Servo Motor as a motor that has closed the loop so it
> knows the position of the motor.
>
> Years ago there were discussions about closed loop with linear scales.
> The trouble there is the amount the motor has t
On 19 January 2016 at 07:04, Chris Albertson wrote:
> I've read that it is hard to use steppers for closed loop CNC. If this is
> still true could some one explain the theory.
This may be a misunderstanding.
It is hard to do anything useful with an encoder attached to a stepper
motor. You can te
Hi Chris!
How about that:
http://catalog.orientalmotor.com/item/all-categories/ories-legacy-products-stepper-motor-drivers-legacy/asd16a-c?cid=1002&prodid=3001170&itemid=63126&backtoname=Item+%23+ASM98ACE&pane=sb&bc=100%7C3001136%7C3001170xx
I use it for a long time.
Regards,
Andrew
Вторни
Hi Chris,
Wiki defines Servo Motor as a motor that has closed the loop so it knows the
position of the motor.
Years ago there were discussions about closed loop with linear scales. The
trouble there is the amount the motor has to turn before the scales report
data. That can cause oscillations th
Hi Chris,
At my work place, closed loop systems with steppers has been in use for years.
It is a scientific institute and the controller has been developed inhouse.
The controller is doing the step generation based on a demanded position.
Encoder feedback on the real axis is giving the error.
With
In a closed loop their is feed back, read about control theory. Stepper motors
are usually run open loop and no feedback is needed although they may loose
steps if not correctly tuned.
Nicklas Karlsson
On Mon, 18 Jan 2016 23:04:05 -0800
Chris Albertson wrote:
> I've read that it is hard to u
Just needs the loop closing and a sensible driver I think. eg :-
http://www.galil.com/news/servotrends/closed-loop-stepper-motor-performance-gains?utm_medium=email&utm_campaign=01-16%20ServoTrends&utm_content=01-16%20ServoTrends+CID_99eb132dcec7ff54cbcbb34e1ca392e5&utm_source=Campaign%20Monitor&ut
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