The Concept Of Three-Phase Electricity

When the coil rotates in the magnetic field, the wire cutting the magnetic field line will generate an induced electromotive force, and its variation law can be represented by a sine curve. If we take three coils and place them at an angle of 120 degrees in space, the three coils are still rotating at the same speed in the magnetic field, and three induced electromotive forces with the same frequency will be induced. Since the three coils differ by 120 degrees in spatial position, the generated current is also a three-phase sinusoidal change, which is called three-phase sinusoidal alternating current. Industrial electricity uses three-phase electricity, such as three-phase AC motors.

The voltage between any two phases is 380VAC, and any relative zero voltage is 220VAC. Divided into A phase, B phase, C phase. The lines are represented by L1, L2, and L3. (Three-phase alternating current also has 660VAC and 6000VAC power supply due to different uses).

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