A complaint of a burnt smell from an electric dryer is not a common complaint.
You don't mention any other symptoms so I assume the dryer is drying okay and the clothes aren't over dry.
You don't mention if it does this in the time dry cycle and the automatic cycle or does it only happen in one of those cycles.
First I'd recommend you remove the vent hose from the back of the dryer and run one medium load with the vent hose off and see if the smell is still there.
Check the vent for a heavy lint build up.
With the vent off you can check the temperature in the exhaust and see what it is cycling at. The temperature should cycle between 135 degrees and 160 degrees. It is possible the dryer is getting to hot and is over heating the clothes.
You can also check the condition of the belt and see if there are any burn marks.
To check the belt you will need to remove the lint filter and remove the two screws located there. With a putty knife you can push in and release the two clips holding the top down located about 2-4 inches from the front corners.
Check the drum for any kind of foreign substance that might be giving off the smell.
If the laundry room was recently painted or a floor was put down the fumes from the paint or adhesive can burn and give off an odor.
I hope this information helps to resolve this problem for you. If any other questions arise then submit another question with any additional details for further assistance with this problem.
I hope this information helps to resolve your problem.