Can dual-voltage, wye-wound, 9-lead motors be field-connected in delta?

Dual-voltage, wye-wound, 9-lead motors are designed specifically to be connected in a wye (Y) configuration for optimal performance at their rated voltages. While these motors can be connected in various ways, connecting them in a delta (Δ) configuration without proper considerations can lead to issues.

The main reason why dual-voltage, wye-wound, 9-lead motors cannot be connected in delta lies in the design and intended operating characteristics of these motors. When a wye-wound motor is connected in delta, the relationship between line and phase voltage changes, potentially leading to excessive currents and overheating. The motor may not operate properly at the specified voltage or may become damaged due to the increased current levels.

Moreover, a delta connection typically requires a different voltage rating than the motor is designed for in a wye configuration. Therefore, without adapting the motor's design specifications and ensuring proper voltage levels, connecting a dual-voltage, wye-wound, 9-lead motor in delta would not be a suitable or safe practice. Thus, the answer indicating that these motors cannot be field-connected in delta accurately reflects the technical limitations of their design.