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power transformer

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Mdkanz

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I have a 7.2v dc 2100 ma power supply that i am using on a dc motor. i was wondering if all power supplies get hot or is it my motor. (it gets almost to hot to touch)
 
Too little info. Can't tell you that until you tell us the voltage and current rating of the motor.
 
Put a multimeter set to 10A in series with the motor, if >2.1A is indicated on the display then the supply is being overloaded and might be damaged if it's left running for too long.

Make sure the load you intend to drive is connected when you perform this test or the results won't be valid.
 
Transformers that are made in some countries are absolute garbage.
I have a Chinese one that is almost red hot with its rated load. Maybe it has an internal short (except it is not too hot without a load) and maybe the manufacturer "forgot" to install a thermal fuse.
 
Overload ??

I have a 7.2v dc 2100 ma power supply that i am using on a dc motor. i was wondering if all power supplies get hot or is it my motor. (it gets almost to hot to touch)

I would bet you are trying to drive a motor that is too large for the power supply ie more than 2.1A on 7.2 VDC line.
Power supplies will get warm 100 and maybe hot 120 or so if too hot to touch something is wrong.

Dan Bentler
 
Perception of hot is relative to the person. I work with some commercial and industrial stuff thats not considered over worked hot until near 200 F or above on the heat sinks.

120 F is no big deal for typical electronics. Most stuff has ambient air temp ratings around that.

Too hot to touch is around 140 - 150 F. If its a cheap motor or transformer 150 F may be near its design limit though.

If its starting to smell like the insulating varnish is cooking then yes its to hot for its design.
 
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