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Date

05-12-2008

Re: Servo motors

Emimec

05-12-2008

Posted by Mark Rand on May 12, 2008, 4:35 pm

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>when compared with the closed loop stepper motor set-up.

Just being a little bit picky here:-

A closed loop stepper motor setup would be quite rare and probably only be
used by people called Gareth :-0

Everyone else would use them open loop.

Mark Rand
RTFM

Posted by Tony Jeffree on May 12, 2008, 5:10 pm

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On Mon, 12 May 2008 21:35:03 +0100, Mark Rand

>>when compared with the closed loop stepper motor set-up.

>
>
>Just being a little bit picky here:-
>
>A closed loop stepper motor setup would be quite rare and probably only be
>used by people called Gareth :-0
>
>Everyone else would use them open loop.
>
>
>Mark Rand
>RTFM

Mark -

Actually, Taig offer a closed loop stepper setup.

Regards,
Tony

Posted by Steve on May 12, 2008, 5:48 pm

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> On Mon, 12 May 2008 21:35:03 +0100, Mark Rand
>

>>wrote:
>>

>>>when compared with the closed loop stepper motor set-up.

>>
>>
>>Just being a little bit picky here:-
>>
>>A closed loop stepper motor setup would be quite rare and probably only be
>>used by people called Gareth :-0
>>
>>Everyone else would use them open loop.
>>
>>
>>Mark Rand
>>RTFM

>
> Mark -
>
> Actually, Taig offer a closed loop stepper setup.
>
> Regards,
> Tony

Now when I asked about closed loop set ups using steppers, the response was
that steppers are upto it and you had to use servos to implement closed
loop...

So much for "Power of the crowd"!

Steve

Posted by Lester Caine on May 13, 2008, 1:35 am

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Steve wrote:

>>>> when compared with the closed loop stepper motor set-up.
>>>
>>> Just being a little bit picky here:-
>>>
>>> A closed loop stepper motor setup would be quite rare and probably
>>> only be used by people called Gareth :-0
>>>
>>> Everyone else would use them open loop.
>>>

>> Actually, Taig offer a closed loop stepper setup.

>
> Now when I asked about closed loop set ups using steppers, the response
> was that steppers are upto it and you had to use servos to implement
> closed loop...
>
> So much for "Power of the crowd"!

I am supplying currently both open loop and closed loop stepper motor systems
using the Taig/Microproto controller. The closed loop give a three fold
improvement in speed, but since it is implemented in the controller and only
gives feedback to Mach3 when there is an error condition, I suspect Mach3 is
getting ahead of the game from time to time. So current plan is an improved
link with Mach3. Brian at Newfangled is due to send me a plugin for Mach3
which will run this improved arrangement.

The reason for looking at servo motors was to compare prices, but I am finding
that at this size of motor the stepper does seem to be preferable? Once you
can monitor it's position ;)

Now the next step is perhaps glass scales on the bed in place of the encoders
direct to the motor?

--
Lester Caine - G8HFL
-----------------------------
Contact - http://home.lsces.co.uk/lsces/wiki/?page=contact
L.S.Caine Electronic Services - http://home.lsces.co.uk
EnquirySolve - http://enquirysolve.com/
Model Engineers Digital Workshop - http://medw.co.uk//
Firebird - http://www.firebirdsql.org/index.php

Posted by Lester Caine on May 13, 2008, 4:47 am

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Lester Caine wrote:

> The reason for looking at servo motors was to compare prices, but I am
> finding that at this size of motor the stepper does seem to be
> preferable? Once you can monitor it's position ;)

Oh well - from £400 for a similar sized servo motor and I'm not sure if that
includes in integral drive as against £75 for the stepper motor option
complete - per channel ...

--
Lester Caine - G8HFL
-----------------------------
Contact - http://home.lsces.co.uk/lsces/wiki/?page=contact
L.S.Caine Electronic Services - http://home.lsces.co.uk
EnquirySolve - http://enquirysolve.com/
Model Engineers Digital Workshop - http://medw.co.uk//
Firebird - http://www.firebirdsql.org/index.php

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