I have a DC motor and when I apply voltage to it, it starts to spin for about a good full second, then it just ... stops ...
How is this possible?
How is this possible?
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Re: Can a DC motor start then just ... stop?
maybe the winding has a break that opens when it heats up. -
Re: Can a DC motor start then just ... stop?
does it have brushes ?
are the bearings free ?Comment
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sigpicComment
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Re: Can a DC motor start then just ... stop?
Does it work at 12V?
If not, stj had the most likely reason.
If it works at 12V (and 8V)...then we're probably dealing with the behavior of the buck PSU that's turning the motor.Comment
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Re: Can a DC motor start then just ... stop?
12V DC motor runs at 1V?Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Can a DC motor start then just ... stop?
Does the motor have a speed control terminal? How about a picture?Comment
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Re: Can a DC motor start then just ... stop?
try spraying it with freezer after it stops - ir just keep it powered and see if it start again after a whileComment
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Re: Can a DC motor start then just ... stop?
coolant sprayComment
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Re: Can a DC motor start then just ... stop?
Why don't you show us the motor we are dealing with?Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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sigpicComment
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Re: Can a DC motor start then just ... stop?
And that's a 6-9V motor?Comment
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Re: Can a DC motor start then just ... stop?
That looks like a standard "280" size motor, more or less, but with sealed metal back instead of usual plastic cap. Of course, this being from Amazon, there's very little technical information, let alone a proper product datasheet. (I love how they give a vague RPM and rated voltage range. What about stall current? Stall torque? Maximum efficiency at ___ RPM?? A datasheet could answer all of that. On that note, I really don't understand why people buy so much junk from Amazon. It's the worst place when it comes to product info. Even the most terribly translated eBay listings I've seen usually provide better product specs. And Amazon prices are usually pretty ripoff too. $7 for that motor?
Hope you at least got one with carbon brushes. But truthfully, I really wish Amazon would stop selling electrical components. /rant.)
Anyways, is the motor about 30 mm long and 22-23 mm in diameter?
If so, that probably is a 280 size motor. If that's the case, I suspect it may be stopping due to worn/bad sleeve bearing(s). Was this motor brand new when you got it or was it used for a while? Being motor with vibration cam makes it even more susceptible to bearing wear.
When I was a kid, I had at least a dozen of toy RC cars end up with seized drive motors like that after many years of use. The way to fix a motor like that is to disassemble it and clean/resurface the sleeve bearings - something probably not worth doing on a cheap/small motor like that, especially if it has a metal back cover (harder to remove.) But it is doable and similar to fixing sleeve bearing computer fans.
Of course, before you conclude anything, how about first try connecting the motor to a known good DC power source to see if it stops or not. I suggest using a standard 5V power adapter or something similar. If it doesn't stop, then whatever circuit you had this in may not be functioning or driving the motor correctly. Otherwise, it's likely worn/bad bearing, as I mentioned above.
* OR *
If the motor stops randomly after running for a while, it is also possible that it may have bad/misaligned/worn brushes. It's rare, but it can happen sometimes on these small cheap motors.Last edited by momaka; 10-27-2020, 07:13 PM.Comment
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i am asking for some Help.
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So i got a few of these from Banggood.
I swapped the motor and now i have a new fault condition.
In a working Frother you would press the start button, it will light red and work for a few minutes.
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With the new Motor it just starts... -
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