What is a Roter Fed Induction Motor?

What is a Roter Fed  Induction Motor?

Inverted Induction Motor Definition

An inverted induction motor is defined as a motor where the rotor has a three-phase winding that receives power supply, creating mechanical revolving characteristics in both the stator and rotor.

Connection Setup

The stator and rotor both have three-phase windings, with the rotor winding in a star configuration connected to slip rings.

Operational Principle

When the rotor and stator windings are fed with a three-phase supply at the same frequency (like 50 Hz), the stator sets up a rotating magnetic field , and a similar field is established in the rotor. The rotor then rotates in the direction of its magnetic field. The rotor’s magnetic field induces an EMF and current in the stator through transformer action, creating a magnetic field that opposes the stator’s field. The rotor frequency links with the stator frequency through slip. As the two magnetic fields oppose each other, the rotor motion slows down or stops.

This motion of the rotor totally depends on the phase difference between stator and rotor applied voltage. It can be said that the speed of the rotor depends on the difference between rotor and stator frequency i.e. (fs – fr). Some harmonics will be induced in both stator and rotor as the rotor acts as the frequency converter in the magnitude.

  Rotor Frequency

The rotor’s speed is influenced by the difference in frequency between the rotor and the stator.

Purpose of Use

• Voltage variation analysis of the measurement coils on the inverted rotor induction motor.

• Measurement circuits voltage analysis for no-load operation of the inverted rotor induction motor.

• Measurement circuits voltage analysis for load operation of the inverted rotor induction motor.