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### Author Topic: Hot Stepper Motor  (Read 6982 times)

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#### BIGWING

• 79
##### Hot Stepper Motor
« on: June 29, 2008, 12:03:38 PM »
Hi All

I am currently adding a 4th axis to my mill (Wabeco 1210E)

The setup is now rotaing accurately but the motor runs hot

very quickly even with rotary table assembly removed.

Please find attached rough drawing showing

A) The motor details supplied by Arceuro

B) Details of how I have wired to G201 Geckodrive

Any help would be greatly appreciated

Cheers George

#### jimpinder

• 1,232
• Wakefield, West Yorks, UK
##### Re: Hot Stepper Motor
« Reply #1 on: June 29, 2008, 01:36:56 PM »
These are exactly the same motors I use, with the Gecko's.

You cannot allow the Gecko drive unlimited freedom - they can (and will) pass up to 7 amps - I am sorry, I have missed what voltage you are using while I am writing this reply. I am using 24 volts. (Do not use less than 24 volts)

With the motor wiredÂ  in parrallel as you have drawn it, you need to limit the Gecko to about 4 amps, by putting a resistor in the two left hand terminals - there is a list of what values to use.

Mine still get hot to touch when I am working them hard, but generally stay touchable
« Last Edit: June 29, 2008, 01:39:19 PM by jimpinder »
Not me driving the engine - I'm better looking.

#### BIGWING

• 79
##### Re: Hot Stepper Motor
« Reply #2 on: June 30, 2008, 08:04:34 AM »
Hi Jim

System designed by Wabeco using 6 amp motors (38v) and all 4 drives have no current set resistor.

As described I am looking to add a 2.5 amp motor for the 4th axis

Looking at the Gecko manual the formulae for calculating this resistor value is

R = 47 *  I  / ( 7 - I )

The motor say current is 2.5 amp / phase

As this motor is wired in parallel what  ' I '  value should I use ?

Cheers George

#### Sam

• 987
##### Re: Hot Stepper Motor
« Reply #3 on: June 30, 2008, 11:12:32 AM »
Resistor values needed are not an exact science. A close value will do fine. 2.5A calls for 27k. Those 6A motors SHOULD have a 270k resistor. Do your motors get hot? Do the drivers get hot or kick out easily?
"CONFIDENCE: it's the feeling you experience before you fully understand the situation."

#### BIGWING

• 79
##### Re: Hot Stepper Motor
« Reply #4 on: June 30, 2008, 01:30:36 PM »
Hi Sam
You have got me worried, just checked again, definately no resistors on existing setup as supplied by Wabeco.
(Don't know if it makes a difference but the motors supplied by wabeco are 4 wire)
Have never noticed othere motors or drivers getting hot as they are either behind fixed covers or inside the panel.
But it's also fair to say they have never done any very long program runs probably 1hr 30mins max
Cheers George

#### Sam

• 987
##### Re: Hot Stepper Motor
« Reply #5 on: June 30, 2008, 06:23:58 PM »
An hour and a half is plenty enough time for them to get hot. I would not worry myself with it. If its worked good for you, then great. Do keep it in the back of your mind though, in case a problem should arise in the future.
"CONFIDENCE: it's the feeling you experience before you fully understand the situation."

#### jimpinder

• 1,232
• Wakefield, West Yorks, UK
##### Re: Hot Stepper Motor
« Reply #6 on: July 01, 2008, 12:13:22 PM »
If you have the Arc Euro Trade motors wired in parrallel as your diagram, then I have llimited miine to 4 amps - running off 24 volts. Use a 60K resistor or the nearest preferred

As long as you have current resisting at 4 amps, the voltage you are putting to them - in your case 38 volts should make not difference.

I am just thinking of upping mine to 36 volts - so let me know how it goes, please.
« Last Edit: July 01, 2008, 12:44:37 PM by jimpinder »
Not me driving the engine - I'm better looking.

#### BIGWING

• 79
##### Re: Hot Stepper Motor
« Reply #7 on: July 06, 2008, 09:01:07 AM »
Hi Jim

Sorry about delay in responding but computer has been out

of action for best part of a week.

Anyway I have sent off an email for a definative answer

for both my motor types from GECKO and I will

let you know the results. Watch this space.

Cheers George

#### BIGWING

• 79
##### Re: Hot Stepper Motor
« Reply #8 on: November 12, 2008, 09:02:11 AM »
Sorry about the delay (several months) in responding with the

results of trials but other work commitments kept me away.

Anyway have just fitted 270 kohms resistors to XYZ geckos (6 amp motors)

and a 27 Kohm resistor to the 4th axis geckodrive (as suggested) with great results.

Particularly the 4th axis which was giving me the problem is now still cool to the touch

when working.

Many thanks Sam/Jim for all your help and I hope this answer is of use to others.

Cheers George

#### Overloaded

• 4,908
##### Re: Hot Stepper Motor
« Reply #9 on: November 12, 2008, 09:30:06 AM »
Thanks for posting back George. It's allways good to end a topic on a good note, especially when it includes the solution.
Thanks again,
RC