What type of motor typically has a higher slip percentage at full load, squirrel cage or wound rotor?

A wound rotor motor typically has a higher slip percentage at full load compared to a squirrel cage motor. This is due to the construction and operation of these two types of motors.

In a squirrel cage motor, the rotor is designed with a fixed construction that provides a consistent performance characteristic, leading to lower slip at full load. The rotor bars in a squirrel cage motor are short-circuited, allowing for efficient operation with minimal slip under varying load conditions.

On the other hand, a wound rotor motor is designed with windings connected to slip rings, allowing for external resistance to be added. This design can result in higher slip because the rotor can be designed to have varying degrees of torque and speed. When external resistance is applied, it causes the rotor to operate at a different speed than the synchronous speed, especially at full load, thus increasing the slip percentage. This feature allows for better control over the motor’s performance but increases the slip, especially under full load conditions.

Therefore, the unique construction and operational capabilities of wound rotor motors contribute to their typically higher slip percentage compared to squirrel cage motors at full load.