Which statement about reversing two phases on rotation is true?

Which statement about reversing two phases on rotation is true?

• A. Rotation stops
• B. Direction remains same
• C. Rotation will change
• D. Rotation speed increases

Answer: (C)

Reversing two of the three supply phases flips the order in which the phase currents reach their peaks, changing the phase sequence. In a three‑phase motor, that phase sequence determines the direction of the rotating magnetic field created by the stator. When the sequence is swapped, the rotating field spins in the opposite direction, so the motor’s rotation changes. The speed remains basically the same because it’s set by the supply frequency and the motor’s design, not by reversing phase leads. There isn’t a stoppage or a speed increase from this swap; only the direction of rotation is affected, aside from transient effects during the swap.

Reversing two of the three supply phases flips the order in which the phase currents reach their peaks, changing the phase sequence. In a three‑phase motor, that phase sequence determines the direction of the rotating magnetic field created by the stator. When the sequence is swapped, the rotating field spins in the opposite direction, so the motor’s rotation changes. The speed remains basically the same because it’s set by the supply frequency and the motor’s design, not by reversing phase leads. There isn’t a stoppage or a speed increase from this swap; only the direction of rotation is affected, aside from transient effects during the swap.