How does a three-phase motor windings get connected for low-voltage?

How does a three-phase motor windings get connected for low-voltage?

• A. Series
• B. Delta
• C. Parallel
• D. Wye

Answer: (C)

Low-voltage operation uses parallel windings so each coil is fed the full line voltage and shares the current. A dual-voltage motor has two identical windings per phase; wiring them in parallel keeps the voltage across each winding the same while the total current capability increases, preserving the magnetic flux and torque. In practice, tie each pair of corresponding winding ends together (U1 with U2, V1 with V2, W1 with W2) and connect the three joined points to the supply lines L1, L2, and L3. If you wired them in series instead, each winding would drop part of the voltage and the current would be limited, reducing torque and performance at the lower voltage. So for a low-voltage setup, the windings are connected in parallel.

Low-voltage operation uses parallel windings so each coil is fed the full line voltage and shares the current. A dual-voltage motor has two identical windings per phase; wiring them in parallel keeps the voltage across each winding the same while the total current capability increases, preserving the magnetic flux and torque.

In practice, tie each pair of corresponding winding ends together (U1 with U2, V1 with V2, W1 with W2) and connect the three joined points to the supply lines L1, L2, and L3. If you wired them in series instead, each winding would drop part of the voltage and the current would be limited, reducing torque and performance at the lower voltage.

So for a low-voltage setup, the windings are connected in parallel.