What type of connection is often required for motors to start properly?

A three-phase connection is often required for motors to start properly because it provides a more consistent and balanced power supply. In three-phase systems, there are three alternating currents that are offset by 120 degrees from each other. This arrangement not only leads to smoother operation and higher efficiency but also reduces the starting current and torque fluctuations that can occur in single-phase systems.

When motors are powered by a three-phase connection, they typically have a higher starting torque compared to those powered by single-phase connections. This is particularly important in industrial settings where motors need to start under load. Using a three-phase supply helps to ensure that the motor can start reliably without tripping or overheating, and allows for a more compact design since smaller motors can be used for the same applications.

In contrast, single-phase connections can struggle to provide enough starting torque for larger motors, which may lead to stalling or failure to start. Series or parallel connections are not applicable to typical motor connections in the context of providing sufficient operational and starting characteristics.