Why is the squirrel cage induction motor one of the most reliable machines used in industry?

Why is the squirrel cage induction motor one of the most reliable machines used in industry?

Three-phase squirrel-cage induction motors are widely used as industrial drives because they are self-starting, reliable and economical. VFDs offer especially important energy savings opportunities for existing and prospective induction motors in variable-torque centrifugal fan, pump and compressor load applications.

What is the principle of operation of squirrel cage induction motor?

Squirrel induction motor working is based on the principle of electromagnetism. When the stator winding is supplied with a three-phase AC, it produces a rotating magnetic field (RMF) which has a speed called synchronous speed. This RMF causes voltage induced in the rotor bars.

Which one is true about squirrel cage induction motor?

Squirrel cage motors are a subclass of induction motors, which harness electromagnetism to generate motion. They are so-called “squirrel cage” motors because the shape of their rotor – the inner component connected to the output shaft – looks like a cage.

Why are squirrel cage induction motors not used for loads requiring high starting torque?

Main disadvantage of squirrel cage induction motor is that they have poor starting torque and high starting currents. When the supply voltage is reduced, induction motor draws more current. During voltage surges, increase in voltage saturates the magnetic components of the squirrel cage induction motor.

What are the advantages of squirrel cage induction motor?

Some advantages of squirrel cage induction motors are:

• Simple and rugged construction.
• The low initial as well as the maintenance cost.
• Maintains constant speed.
• The overload capacity is high.
• Simple starting arrangement.
• High power factor.
• Low rotor copper loss.

What are the advantages of double squirrel cage induction motor?

The advantage of a double-squirrel cage motor is that it provides high starting torque and low starting current.

What is the difference between slip ring and squirrel cage induction motor?

The slip ring induction motors have high starting torque with low starting current whereas squirrel cage motors have low starting torque and high starting current. Slip-ring motor has smooth acceleration under heavy loads as compare to the squirrel cage motor.

What is the working principle of a squirrel cage induction motor?

In short, the working principle of any induction motors involves stator flux and squirrel cage rotor flux. As you can see, the 3 phase squirrel cage induction motor could achieve the electromechanical energy conversion simple and straight forward.

What are the disadvantages of a squirrel cage motor?

The main disadvantage of squirrel cage induction motor is poor speed control and low starting torque. However, with variable frequency drives, these disadvantages can be overcome.

Why is the squirrel cage called an asynchronous motor?

That’s why it’s called squirrel cage induction motor. Normally, we use the motors in industrial drives because they are rugged, reliable and economical. By the way , the induction motor is also called as asynchronous motor because it runs at a speed lower than its synchronous speed.

When did Tesla invent the squirrel cage motor?

Working Principle of 3 phase squirrel cage Induction Motor. On the basis of the theory of electromagnetic field discovered by Michael Faraday, Tesla invented the induction motor in 1887, and his theory of electromagnetism was the cornerstone of modern wireless communication and radio.