MechMate CNC Router Forum

Go Back   MechMate CNC Router Forum > Electrical & Electronic > 70. Control Systems
Register Options Profile Last 1 | 3 | 7 Days Search Today's Posts Mark Forums Read

Reply
 
Thread Tools
  #1  
Old Tue 13 September 2011, 22:59
shikha829
Just call me: shikha
 
V
India
Send a message via Yahoo to shikha829
Stepper motor speed problem.

Hello,

I have stepper motor with following parameter, can someone help me in finding out why my motor did not get speed.
what is the minimum power supply requirement for this config ?
Type : Bipolar
Angle : 1.8deg
Rated Voltage : 4.5
Current/Phase Amp : 3
Resistance/Phase : 1.2 Ohm
Inductance/Phase : 3.8 mH
Holding torque : 25 kgcm
Rotor Inertia : 500 gcm.

I tried rampup using 12V power supply but not get enought speed.

Thanks in Advanced.
Reply With Quote
  #2  
Old Wed 14 September 2011, 02:51
Richards
Just call me: Mike
 
South Jordan, UT
United States of America
If you use Geckodrive stepper drivers, a 3.8mH motor will work well with a 60VDC power supply. I use the G203v stepper drivers, but any Gecko stepper driver will work, even the G250/G251. The G250/G251 drivers are limited to 50VDC, but 50VDC would still give you very good speed.
Reply With Quote
  #3  
Old Wed 14 September 2011, 03:27
KenC
Just call me: Ken
 
Klang
Malaysia
Check this out. http://www.mechmate.com/forums/forumdisplay.php?f=14
Reply With Quote
  #4  
Old Mon 19 September 2011, 00:17
shikha829
Just call me: shikha
 
V
India
Send a message via Yahoo to shikha829
Thanks for your reply, i now have some understanding about this. how much voltage needed to get 25Kgcm torque ? is there any calculation ?
Reply With Quote
  #5  
Old Mon 19 September 2011, 06:50
Richards
Just call me: Mike
 
South Jordan, UT
United States of America
The motors are rated at 25Kgcm HOLDING torque. That usually means that 25Kgcm is also their maximum torque. Depending on the motor, holding torque does not depend on high voltage. Speed requires high voltage. With my Oriental Motor stepper motors, I can generate maximum holding torque at 50% of the voltage required for high speed, as long as 50% is at least 15VDC or 24VDC (depending on whether I'm using G203v stepper drivers or G202 stepper drivers).

You need to look at some torque charts for your motor. Most motors show high torque when they move slowly and then a gradual drop in torque until the speed enters the "knee" portion of the curve. That's when torque suddenly drops off. For best results, you need to keep speed below the "knee" drop-off speed.

I've run some little size-17 motors at more than 6,000 RPM without a load, but even after a short 3-5 minute test, they were too hot to touch. That's what happens when a motor is run past the knee portion of the curve, it loses torque and generates a great deal of heat.
Reply With Quote
Reply

Register Options Profile Last 1 | 3 | 7 Days Search Today's Posts Mark Forums Read

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
UIROBOT Stepper Drives uirobot The Market Place 76 Tue 31 January 2012 09:45
Need help with jog speed in Mach3 motor tuning !!! rival Troubleshooting 45 Sat 03 September 2011 05:03
Would you mind to help me to solve the problem for Keling stepper Motor Driver? qangel1000 Motors & their mountings 6 Fri 07 August 2009 23:42
True Torque of a Servo motor for comparison to a Stepper motor, when used in a router Mcyoda Motors & their mountings 3 Tue 19 August 2008 00:50
Machine locks up while travelling at high speed - Tuning the motor speeds and accels Doug_Ford Troubleshooting 3 Sun 03 February 2008 21:55


All times are GMT -6. The time now is 15:19.


Powered by vBulletin® Version 3.8.3
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.