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Originally Posted by P.E.Haiges
AC motors draw more current as the voltage decreases because they try to put out the same amount of mechanical power. The motor speed decreases, the slip speed increases and the back EMF is reduced.
P E H
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This is only true if the AC motor has a Series Winding- ie- the Field Winding is connected in series with the Armature Winding. These are typically your household appliance motors- mixers, vacuum cleaners, electric drills- they all work harder as you increase the load or decrease the voltage. Also, they are all very noisey.
Other AC motors such as in your fridge have a Parallel Field Winding, so they run at a constant speed, and make a lot less noise. If your house AC power takes a dip, like during a storm, you'd probably notice your fridge motor slow down, but your vacuum cleaner would speed up.
Dave