how to buile a squirrel cage induction motor

How to Build a Squirrel Cage Induction Motorhow to buile a squirrel cage induction motor

There are several aspects to consider when building a squirrel cage induction motor. In this article, we will discuss the different types of squirrel cage induction motors, their starting torque, and windings. We will also cover speed control methods. After reading this article, you will be better equipped to build a squirrel cage induction motor. In the meantime, you can try making a simple model for your squirrel to play with.

Improved method of making squirrel cages

An improved method of making squirrel cage induction motors includes fabricating the rotor as a composite sheet. In this method, the outer and inner stator stampings are available, making the assembly process simple and easy. An annular ring is cut from the ends of the tube to create the end plates of the rotor. The tube’s walls are then thinned to produce a smooth outer surface that will form the rotor.

The rotor and fan in a squirrel cage induction motor are connected through a capacitor arrangement. The rotor must spin faster than the stator synchronous speed to generate residual magnetism. If the rotor and stator rotate at the same frequency, there would be no difference in force. However, the end result of this design is a much stronger motor than the previous one. It is easy to build and is much cheaper than buying a commercially-available motor.

Types of squirrel cage induction motors

The electrical characteristics of squirrel cage induction motors determine the different types available. Specifically, they are categorized into Class A, B, C, and D. Class A squirrel cage motors are typically the largest, and they offer normal starting torque and current. Class B motors are smaller, and their starting torque and current are the same as Class A. If you want a higher starting torque, choose Class C motors.

The main components of a squirrel cage induction motor are the stator, rotor, fan, bearings, and magnetic field. The stator consists of three-phase windings mounted on a laminated iron core. The rotor converts the electrical energy into mechanical output by interacting with an electromagnetic field generated from the stator. The rotor bars produce an opposing voltage when the rotor is spinning. The opposing voltage pushes the rotor around.

Rotor windings

A squirrel cage induction motor is a three-phase induction motor. It is usually made with molten aluminum cast directly into grooves on the rotor. This type of motor has no high-resistance junction points, so the wires are intentionally skewed to make rotation smoother. Its stator windings generate a rotating magnetic field. Induction motors have two main types: squirrel cage motors and wound rotor motors.

Induction motors work by inducing current into a rotating metal object. This current is created by the magnetic field. The current then flows through the rotor, accelerating it in the direction of the rotating magnetic field. The motor shaft rotates near synchronous speed, but never reaches that speed. Hence, squirrel cage induction motors are ideal for making toys and other small appliances.

Starting torque

If we talk about the starting torque of a squirrel cage induction motor, it is six times the rotor current at full load. This starting torque is determined by three factors – the type of rotor bars, the voltage applied to the motor, and the phase angle distinction between the rotor and stator fields. However, this starting torque is different from the one of squirrel cage motors with a squirrel cage.

In this case, the starting torque for the motor is a function of the rotor resistance. In fact, this torque can be increased by adding extra resistance to the rotor during start up. This resistance is cut off as the motor speeds up. The maximum torque of a squirrel cage induction motor is inversely proportional to the square of the rotor reactance and the rotor resistance. Although the starting torque is largely dependent on the resistance of the rotor, the slip of the motor is proportional to the square of the rotor.


The current study focuses on the estimation of the eccentricity of a squirrel cage induction motor under various load conditions. Moreover, the model-based fault diagnosis technique is also successful in identifying the three types of eccentricity fault. This technique is based on a particle swarm optimization method and is verified through simulation and experiments. Moreover, an algorithm for the treatment of eccentricity faults is also introduced.

The three-dimensional model is an efficient and suitable procedure for this purpose. It provides high-precision computations, which are more accurate than those achieved with the two-dimensional model. Moreover, the results of this method are close to the experimental results. Hence, it can be regarded as a feasible replacement for the finite-element method. The accuracy of the results obtained with the three-dimensional model is high and acceptable for this application.

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