A three-phase motor to be used with a part-winding starter must have?

A three-phase motor to be used with a part-winding starter must have?

• A. Three rotor windings
• B. Two stator windings
• C. Three stator windings
• D. Six stator windings

Answer: (D)

Part-winding starting works by splitting the stator into two identical windings for each phase so you can energize only half the windings at first and then energize the second half to reach full torque. This staging reduces starting current and voltage stress. To do that, the motor must have two separate windings per phase, giving a total of six stator windings. The choice with only rotor windings or with only one winding per phase wouldn’t allow the staged energization, and a configuration with fewer windings per phase wouldn’t provide the two distinct windings needed for part-winding starting. Six stator windings is therefore the correct setup.

Part-winding starting works by splitting the stator into two identical windings for each phase so you can energize only half the windings at first and then energize the second half to reach full torque. This staging reduces starting current and voltage stress. To do that, the motor must have two separate windings per phase, giving a total of six stator windings. The choice with only rotor windings or with only one winding per phase wouldn’t allow the staged energization, and a configuration with fewer windings per phase wouldn’t provide the two distinct windings needed for part-winding starting. Six stator windings is therefore the correct setup.