maytag gas dryer hums but wont start.. electric smell.

The dryer came with my house so no real idea how old it is.

all of a sudden (no strange noises prior) the dryer will not start. It will Hum but not turn over. when turning the drum by hand it spins but not very smoothly.

I get a whiff of something electrical, could be the motor? but im no expert. any advice or trouble shooting would be appreciated.

thank you.
-Doug