Which type of motor is commonly classified as a three-phase squirrel-cage motor?

The three-phase squirrel-cage motor is commonly classified as an induction motor. Induction motors work on the principle of electromagnetic induction, where a rotating magnetic field induces current in the rotor, allowing it to turn. Squirrel-cage motors are characterized by their rotor design, which consists of conductive bars short-circuited at both ends, resembling a cage. This type of rotor does not require external connections and is widely used in industrial applications due to its robustness, simplicity, and efficiency.

In contrast, stepper motors are designed for precise control over angular position, making them suitable for applications requiring exact movements rather than continuous operation. DC motors operate on direct current and are often used where speed variation and high starting torque are necessary. Servo motors, meanwhile, are closed-loop systems that provide precise control over angular position and velocity, utilizing feedback to adjust their output and are typically found in applications requiring high accuracy. Thus, the classification of squirrel-cage motors as induction motors aligns with their operational principles and common uses.