What is the common feature of dual-voltage three-phase motors regarding their connection?

Dual-voltage three-phase motors are designed to operate at two different voltage levels, commonly specified as low voltage and high voltage. The common feature of these motors is that they typically utilize a Y (star) or delta connection with nine leads. This configuration allows for versatility in how the windings can be connected based on the system's voltage.

When connected in the Y configuration, a lower voltage supply can be introduced, which draws less current, making it efficient for applications where the motor operates at a lower voltage. Conversely, the delta connection is utilized for higher voltage applications, allowing the motor to achieve greater power output.

The nine leads facilitate the dual-voltage feature, enabling users to configure the motor appropriately depending on the voltage level required for a specific application. This versatility is particularly useful in various industrial settings where power supply conditions may vary.

Connections with variable leads are not specific to the standard dual-voltage configurations and may lead to confusion regarding the versatility and proper operation of the motor. In contrast, the established nine-lead system ensures clarity and practicality in altering the motor's configuration as needed.