[HayZee518]

any motor except the real cheap ones fractional horsepower induction type will dim lights on a circuit. the dimming is less evident on three phase circuits. 120 volt and 240 volt single phase will dim lights for a split second. after all in a motor you have a center spinning object [armature - rotor] and an outside coil or bunch of coils connected to the lines [ mains] when power is turned on the coils act like a short circuit, but resistance [of the magnet wire] is taken into consideration. it builds up a magnetic field which acts upon the [rotor] to start spinning. the [rotor] is actually trying to catch up to the rotating magnetic field in the stator coils.