What is the relationship between the rated current, stator current, and rotor current of a three-phase asynchronous motor?

In three-phase asynchronous motors, rated current refers to the current value of the motor when operating at rated power and rated voltage. Rated current is an important parameter in motor design and selection, used to ensure that the motor will not overload or overcurrent under normal operating conditions.

The relationship between the rated current of a three-phase asynchronous motor and the stator current and rotor current is as follows:
Stator current: stator current refers to the current flowing in the stator winding of an electric motor, also known as the main current. Under normal operating conditions, the stator current is equal to the rated current.
Rotor current: The rotor current refers to the current flowing in the rotor of an electric motor. Due to the working principle of asynchronous motors, the magnitude of the rotor current is related to the load of the motor and is usually a part of the stator current.
Rated current: Rated current refers to the current value of the motor at rated power and rated voltage, which is specified on the motor model plate. It is equal to the stator current.

When selecting a circuit breaker, it is usually based on the rated current of the motor. The rated current of the circuit breaker should match the rated current of the motor to ensure that the circuit breaker can disconnect the circuit in a timely manner during motor operation, protecting the motor and electrical system from overload and short circuit damage.