kortslutningsrotor

A kortslutningsrotor, also known as a squirrel cage rotor, is a fundamental component of an induction motor. It consists of a cylindrical core made of laminated steel, onto which conducting bars are embedded. These bars are typically made of aluminum or copper and are short-circuited at both ends by end rings. The arrangement of the bars and end rings resembles the spinning cage of a squirrel, hence the common name.

The design of the kortslutningsrotor is simple and robust, contributing to the reliability and low maintenance requirements of induction motors. When the stator winding is energized with an alternating current, it produces a rotating magnetic field. This rotating field induces a voltage in the rotor bars, which then drives a current through them due to the short-circuiting effect of the end rings. The interaction between the induced rotor currents and the stator's rotating magnetic field generates torque, causing the rotor to spin.

The resistance of the rotor bars can influence the starting torque and speed characteristics of the motor. Higher resistance generally leads to higher starting torque but lower maximum speed. In some specialized applications, rotor bars can be designed with different materials or shapes to achieve specific performance requirements. The kortslutningsrotor is a key element that makes induction motors widely used in industrial and domestic applications due to their efficiency, durability, and cost-effectiveness.