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Damaged or broken motor mounts are arguably the most serious cause of engine vibration. CarsDirect.com suggests that a driver shift between drive and neutral while the vehicle is sitting still. If the vibration lessens while in neutral, the motor mounts may have sustained damage.
The motion of the motor is created by the interaction of the magnetism caused by the currents flowing the the stator and the rotor. This interaction causes the rotor to turn and provide the drive. The stator and the rotor of the DC motor are connected electrically.