Different motor temperatures in serial connection
Posted by drmaestro
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Different motor temperatures in serial connection April 23, 2017 05:09AM |
Registered: 9 years ago Posts: 330 |
Hi,
I have observed an interesting phenomena and would like to know if it is normal. I have 2 Z steppers and they use their own connectors on Duet, so they are wired in series (the default configuration). Both of the steppers are identical.However during a print, one is considerably colder than the other. How is that possible? Shouldn't they be both at the same temperature?
Thanks
I have observed an interesting phenomena and would like to know if it is normal. I have 2 Z steppers and they use their own connectors on Duet, so they are wired in series (the default configuration). Both of the steppers are identical.However during a print, one is considerably colder than the other. How is that possible? Shouldn't they be both at the same temperature?
Thanks
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Re: Different motor temperatures in serial connection April 23, 2017 03:34PM |
Registered: 10 years ago Posts: 14,672 |
Yes they should be at the same temperature if they are identical motors, unless they have very different cooling e.g. one bolted to a metal surface and the other not. If you have a multimeter, you could measure the resistance of the windings of both to see if there is any difference.
Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod
Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].
Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod
Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].
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Re: Different motor temperatures in serial connection April 24, 2017 06:23AM |
Registered: 9 years ago Posts: 330 |
Quote
dc42
Yes they should be at the same temperature if they are identical motors, unless they have very different cooling e.g. one bolted to a metal surface and the other not. If you have a multimeter, you could measure the resistance of the windings of both to see if there is any difference.
It is probably a very basic question but how do you measure the resistance of the windings? I know that there are 2 pairs in each (so 4 connectors) and I can use a LED to find which ones are paired. Should I measure the resistance at each pair?
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Re: Different motor temperatures in serial connection April 25, 2017 03:03AM |
Registered: 10 years ago Posts: 14,672 |
You can just as easily use the multimeter to find the pairs, because you will have a resistance of a few ohms between two wires that are a pair. However, as your motors are moving properly, we already know that the 2 wires connected to one end of each motor connector on the Duet are a pair, and the 2 wires connected to the other end are the other pair.
Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod
Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].
Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod
Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].
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