Nine-lead 3Ø motors are usually internally connected as which configuration?

The correct choice highlights the common internal connection configurations for nine-lead three-phase motors, which are typically set up as either delta or wye (star) configurations.

In a delta configuration, the motor windings are connected in such a way that each phase is connected to the next one, forming a closed loop. This allows for higher starting torque and is beneficial in applications requiring robust performance.

In contrast, the wye configuration connects one end of each winding to a common point, providing a different voltage and current behavior. Wye configurations generally allow for smoother starting characteristics and reduced line currents, making them suitable for varying load conditions.

Understanding these two configurations is crucial for selecting the right motor connection for specific applications, as each has distinct advantages depending on the operational requirements, such as torque and efficiency.