How many types of rotor are there in 3 phase induction motor?

There are two types of induction motor rotors: Squirrel-cage rotor or simply cage rotor. Phase wound or wound rotors.

How many types of rotors are there?

The four different rotor types are: Blank & Smooth – Blank and smooth rotors are what you’ll find on most passenger vehicles and feature a smooth, blank metal surface all the way around the rotor. Drilled – Drilled rotors feature drilled holes around the metal surface.

What are the types of 3 phase induction motor?


  • Squirrel Cage Induction Motor.
  • Slip Ring Induction Motor or Wound Rotor Induction Motor or Phase Wound Induction Motor.


What are the two major types of rotor winding placed in 3 phase induction motor?

Induction motor rotors may be of two types, wound rotor or squirrel-cage rotor.

What are the two types of three phase induction motor?

Types of Three Phase Induction Motors

  • Squirrel Cage Induction Motor.
  • Slip-ring or Wound Rotor Induction Motor.
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What are the two types of rotors?

There are two types of induction motor rotors: Squirrel-cage rotor or simply cage rotor. Phase wound or wound rotors.

How is rotor current calculated?

3 Answers. The synchronous speed of the rotor in RPM N = 120f/P where f is the frequency of the stator current and P is the number of poles. The operating speed No = N – Ns where Ns is the slip speed. The frequency of the rotor current fr = Ns x P/120, so fr = 0 if the slip is zero.

What are the advantages of 3 phase induction motor?

Unlike synchronous motors, a 3 phase induction motor has a high starting torque, good speed regulation and reasonable overload capacity. An induction motor is a highly efficient machine with full load efficiency varying from 85 to 97 percent.

What is the working principle of 3 phase induction motor?

Principle of Operation of 3-Phase Induction Motor. When the motor is excited with a three-phase supply,three-phase stator winding produces a rotating magnetic field with 120 displacements at a constant magnitude which rotates at synchronous speed.

How do I know if a motor is 3 phase?

3 phase motors will have 3 power wires (usually labeled L1, L2, L3) while single phase will only have two wires and a ground.

How many types of 3 phases are there?

There are two basic three-phase configurations: wye (Y) and delta (Δ). As shown in the diagram, a delta configuration requires only three wires for transmission but a wye (star) configuration may have a fourth wire. The fourth wire, if present, is provided as a neutral and is normally grounded.

What is frequency of rotor EMF?

The frequency of the induced emf in rotor is? Explanation: The induced frequency will be f = P(Ns-Nr)/2. f = 4(1500-1450)/2 = 100 Hz.

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What is the difference between rotor speed and synchronous speed?

Induction motor with squirrel cage rotor has two different speeds. The synchronous speed refers to the stator rotating magnetic field, which depends on the number of poles and frequency. … The rotor speed will be always slower than the stator speed, we call it slip.

What is synchronous speed?

: a definite speed for an alternating-current machine that is dependent on the frequency of the supply circuit because the rotating member passes one pair of poles for each alternation of the alternating current.

What are 3 phase motors used for?

Three-phase squirrel-cage induction motors are widely used as industrial drives because they are self-starting, reliable and economical. Single-phase induction motors are used extensively for smaller loads, such as household appliances like fans.

How does an induction motor start?

A three-phase Induction Motor is Self Starting. When the supply is connected to the stator of a three-phase induction motor, a rotating magnetic field is produced, and the rotor begins rotating and the induction motor starts.