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Author Topic: idiots guide to servo motors and drives please  (Read 4376 times)

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Offline nobby

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idiots guide to servo motors and drives please
« on: June 22, 2014, 09:22:20 PM »
hello servo motors for complete idiots please.
for example
http://www.ebay.co.uk/itm/Used-Mitsubishi-AC-Servo-Motor-HC-MF23-UE-200W-Output-30-DAY-WARRANTY-/141027193327?pt=LH_DefaultDomain_0&hash=item20d5e031ef
I would gather that that is a nema 23 sized motor = physically?
56mm wide foot about the same in length
I don't understand the 120 volt input???
does that mean its 120 volts to the drive, and the feed to the motors steps down to 24 or 36 volts
a mere 1.5 amps?

my basic understanding is you have a hall sensor spinning on the back of the motor that simply talks to the drive doing on the spot
positioning and correcting - does it then do power demands too?

i take it this is not a servo drive?
http://www.ebay.co.uk/itm/DFR1507-5-Phase-Driver-Vexta-Fine-Step-Used-/310932443620?pt=LH_DefaultDomain_0&hash=item48650491e4
even though its 5 phases?


« Last Edit: June 22, 2014, 09:24:49 PM by nobby »
Re: idiots guide to servo motors and drives please
« Reply #1 on: June 22, 2014, 10:10:11 PM »
Hi,

This is an AC servo motor. Unless you have the driver matched for this motor, I'd leave it alone.

The driver you have identified is for a stepper motor and not suitable as a servo driver

Cheers,

Peter
----------------------------------------------------
Homann Designs
http://www.homanndesigns.com
email: peter at homanndesigns.com

Offline nobby

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Re: idiots guide to servo motors and drives please
« Reply #2 on: June 25, 2014, 03:38:02 PM »
is there a comprehensive list of servo motors and drives that use step and direction instead of 10v signalling


can you mix and match servo drives and motors




Offline ger21

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Re: idiots guide to servo motors and drives please
« Reply #3 on: June 25, 2014, 03:41:02 PM »
1) No
2) If you know what your doing, in some cases, yes. If you have to ask, it's probably not a good idea to attempt it.
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html

Offline nobby

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Re: idiots guide to servo motors and drives please
« Reply #4 on: June 25, 2014, 05:43:45 PM »
yes I think its wise me swerving the whole idea.
mostly coz its too expensive .............

Offline Hood

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Re: idiots guide to servo motors and drives please
« Reply #5 on: June 25, 2014, 07:31:39 PM »
DC Servos can be paired with almost any DC drive as long as the motors current and, to a lesser extent, voltage are comparable to the drives output.

AC servos are a different matter, some drives can be configured to use motors from other manufacturers and others can only be used with the motors meant for them. Some AC drives require resolver feedback, some incremental encoder feedback, some serial (sine/cosine etc) and some can use more than one.

So as has been said by Gerry, unless you know a bit about them, or want to investigate/learn, then it is best to go for a matching pair of motor/drive.

Most modern AC servos will be capable of Step/Dir , some makes have different models within the range that are analogue command or step/dir but not capable of both, so you have to do a bit of reading before you jump in and buy them. Having said that there are controllers available for Mach that can utilise analogue command servo drives and they actually have some benefits over Step/Dir controllers. I use the CSMIO/IP-A  but there is also the DSPMC, Galil, Kflop with Kanalog.

Hood

Offline nobby

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Re: idiots guide to servo motors and drives please
« Reply #6 on: June 26, 2014, 06:33:05 AM »
so stay with dc 48-60v

buy 3
amc  BE12A6E X04
copley 503
leadshines

Offline nobby

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Re: idiots guide to servo motors and drives please
« Reply #8 on: June 26, 2014, 04:00:33 PM »
« Last Edit: June 26, 2014, 04:14:04 PM by nobby »

Offline ger21

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Re: idiots guide to servo motors and drives please
« Reply #9 on: June 26, 2014, 04:40:21 PM »
The Leadshine's I linked above should work fine. You just need a 60V DC supply running off your 230V AC.
You can get them on Ebay for about $500 US per set. Probably less than 1/2 the panasonic.
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html