Bi-ventricular pacemaker â Maintains heart rate using synchronized pacing, or cardiac resynchronization therapy (CRT), that connects both the right and left ventricles; used to treat advanced heart failure; Implantable cardioverter defibrillator (ICD) â Monitors and paces the heart; delivers energy that restores the heart to a normal rhythm when it detects a dangerous rhythm; available in single-chamber, dual-chamber and bi-ventricular models.
The rotor is a moving component of an electromagnetic system in the electric motor, electric generator, or alternator. Its rotation is due to the interaction between the windings and magnetic fields which produces a torque around the rotor's axis.
1 Electric motor rotor: the rotor follows (turns in the direction impelled by) the rotating magnetic field and thus spins the motor shaft.  Electric motor stator: the stator consists is a device or core containing start and run windings (of copper wire) wound around a central core to create a magnetic field.