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AC Circuit Analysis - Vol 4 - 3-Phase Circuits, Part 1
02 - Why is 3-Phase Power Useful? Learn Three Phase Electricity
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Here we learn why 3 Phase Power systems are useful for supplying large blocks of electricity and for supplying power to rotating motors. We learn that when you calculate the total power delivered to a motor over the three phases, the total power is constant even though each phase has a time varying power component.
This means that the motor will run more smoothly with less vibration and is why in practice three phase motors are commonly used in industrial equipment.