The rotor is a crucial component of an electric motor, responsible for converting electrical energy into mechanical energy.

It is the rotating part of the motor that interacts with the stator’s magnetic field to produce motion. The design and construction of the rotor vary depending on the type of electric motor, but its primary function remains the same across different motor types.

Rotor Designs

Squirrel Cage Rotor

A Squirrel Cage Rotor is a fundamental component of induction motors, known for its robustness, simplicity, and cost-effectiveness. It operates based on electromagnetic induction principles, where currents induced in the rotor bars interact with the rotating magnetic field to produce mechanical torque.

Rotor bars are typically aluminum or copper.

Wound Rotor

A wound rotor is a type of rotor used in induction motors where high starting torque and variable speed control are required. It features windings connected to slip rings and brushes, allowing for external resistance to be inserted into the rotor circuit.

Permanent Magnet Rotor

A Permanent Magnet Rotor is a type of rotor that uses permanent magnets to create a magnetic field, offering high efficiency, improved performance, and reduced maintenance compared to traditional rotor designs.

Salient Pole Rotor

A salient pole rotor is a type of rotor design characterized by its protruding poles, used primarily in synchronous machines for applications requiring high torque at low speeds. The poles, equipped with field windings and often enhanced with pole shoes, create a magnetic field when supplied with direct current.

Non-Salient Pole (Cylindrical) Rotor

A non-salient pole (cylindrical) rotor is a type of rotor used in synchronous machines, characterized by its smooth, cylindrical shape and uniform air gap. This design allows for high-speed operation, mechanical strength, and stable performance, making it ideal for applications like turbo-generators and high-speed synchronous motors.

DC Armature

A DC armature is a critical component of DC motors and generators, responsible for converting electrical energy into mechanical energy or vice versa. Comprising a laminated core, windings, commutator, and brushes, the armature interacts with the magnetic field to produce rotational motion.