If the phase sequence is reversed, the rotation direction will

If the phase sequence is reversed, the rotation direction will

• A. Reverse direction
• B. Remain unchanged
• C. Stop
• D. Increase speed

Answer: (A)

Phase sequence determines the direction of the rotating magnetic field produced by the stator windings. When the three windings are energized in one order, the field rotates in a certain direction; reversing the sequence makes the field rotate in the opposite direction. The rotor tends to follow that rotating field, so the rotor’s motion reverses as well. The speed stays the same because it’s set by the supply frequency and the machine’s pole count, not by the phase order. So changing the phase sequence reverses the rotation direction.

Phase sequence determines the direction of the rotating magnetic field produced by the stator windings. When the three windings are energized in one order, the field rotates in a certain direction; reversing the sequence makes the field rotate in the opposite direction. The rotor tends to follow that rotating field, so the rotor’s motion reverses as well. The speed stays the same because it’s set by the supply frequency and the machine’s pole count, not by the phase order. So changing the phase sequence reverses the rotation direction.