For what type of load is a capacitor start motor most effective?

A capacitor start motor is particularly effective for heavy loads or high inertia loads because it provides a higher starting torque compared to other types of single-phase motors. The capacitor helps to create a phase shift in the current, which improves the starting torque significantly. This is essential for applications where the load may be difficult to start, such as in applications involving pumps, compressors, or large fans.

When the motor starts under these conditions, the additional torque generated by the capacitor allows the motor to overcome the inertia of the load and accelerate it to operational speed efficiently. This capability makes capacitor start motors ideal for situations where starting under heavy load is required, ensuring reliable performance of the motor in demanding applications.

In contrast, lighter loads or constant torque loads do not benefit as much from the high starting torque that a capacitor start motor provides.