When wiring dual-voltage motors, what configurations are used to accommodate different line voltages?

When wiring dual-voltage motors, what configurations are used to accommodate different line voltages?

• A. Wye (Y) or Delta
• B. Series or Parallel
• C. Star or Mesh
• D. Open Delta or Closed Delta

Answer: (A)

When wiring dual-voltage motors, you adjust how the windings are connected to match the supply voltage by using two common schemes: Wye (Y) and Delta. In a Delta connection, the windings are linked end-to-end in a loop, so each winding is connected across two line conductors and therefore experiences the full line voltage. This setup is used for the higher voltage option. In a Wye connection, one end of every winding is tied to a common neutral point, while the other ends connect to the three lines; each winding then sees the line-to-neutral voltage, which is the line voltage divided by √3. For motors rated 230/460 V, you typically use Delta for 460 V operation and Wye for 230 V operation. The configuration also affects current: Delta line current is √3 times the winding current, while Wye line current equals the winding current, explaining why wiring must match the voltage and current ratings.

When wiring dual-voltage motors, you adjust how the windings are connected to match the supply voltage by using two common schemes: Wye (Y) and Delta. In a Delta connection, the windings are linked end-to-end in a loop, so each winding is connected across two line conductors and therefore experiences the full line voltage. This setup is used for the higher voltage option. In a Wye connection, one end of every winding is tied to a common neutral point, while the other ends connect to the three lines; each winding then sees the line-to-neutral voltage, which is the line voltage divided by √3. For motors rated 230/460 V, you typically use Delta for 460 V operation and Wye for 230 V operation. The configuration also affects current: Delta line current is √3 times the winding current, while Wye line current equals the winding current, explaining why wiring must match the voltage and current ratings.