Advantages and Disadvantages of Induction Motor

Advantages of Induction Motor The most important advantage of an induction motor is that its construction is quite simple in nature. The construction of the Stator is similar in both Synchronous motors as well as induction motors. However, a slip ring is required to feed DC Supply to the Rotor in the case of a … Read more

Low Power Factor Operation of Induction Motor

Induction Motors finds various applications in industries and household equipments. Such machine requires magnetic fields for its functioning hence, it draws magnetizing current from the source. The magnetizing current is the current that establishes the flux in the air gap of an Induction motor and this is independent of the load on the motor. It … Read more

Induction Motor Maintenance

“Maintenance” as the name suggests it is the action necessary for retaining or restoring a piece of equipment or machine to the specified operable condition to achieve its maximum useful life. Maintenance can be classified into two groups: Restorative (Repairs) Maintenance: It is the most primary type of repairs. It arises after a fault being carried … Read more

Application of Induction Motor

Application of Induction Motor differ by the type of rotor which is being used Squirrel Cage Rotor Slip Ring Rotor or Wound Rotor Type Squirrel Cage Rotor A squirrel type rotor is used in a squirrel cage motor. It has a cylindrical laminated core with slot parallel to the shaft, uninsulated conductor bar of aluminum … Read more

Crawling and Cogging of Induction Motor

The important characteristics normally shown by a squirrel cage induction motors are crawling and cogging. These characteristics are the result of improper functioning of the motor that means either motor is running at very slow speed or it is not taking the load. Crawling of Induction Motor It has been observed that squirrel cage type … Read more

AC Series Motor

AC series motors are also known as the modified DC series motor as their construction is very similar to that of the DC series motor. Before we discuss these modifications, here it is essential to discuss what is the need and where do we need to do modifications. In order to understand this, consider this … Read more

Phasor Diagram for AC Series Motor

We will discuss here the simplest way of drawing the phasor diagram for an AC series motor. Before we draw phasor diagram, let us write the various notations for each quantity at one place. Here we will use: Rs to represent the resistance of the series field Rp to represent the resistance of the inter … Read more

Schrage Motor Operation Principle and Characteristics of Schrage Motor

Schrage motor is essentially a combination of wound rotor induction motor and frequency convertor. Schrage motor can be treated as an inverted poly phase induction motor. Unlike induction motor the primary winding of Schrage motor is on the rotor. Three phase supply is given to the primary with the help of 3 slip rings. The … Read more

Circle Diagram of Induction Motor

What is a Circle Diagram A circle diagram is a graphical representation of the performance of an electrical machine. It is commonly used to illustrate the performance of transformers, alternators, synchronous motors, and induction motors. It is very useful to study the performance of an electric machine under a large variety of operating conditions. The … Read more

Equivalent Circuit for an Induction Motor

Induction motor is a well-known device which works on the principle of transformer. So it is also called the rotating transformer. That is, when an EMF is supplied to its stator, then as a result of electromagnetic induction, a voltage is induced in its rotor. So an induction motor is said to be a transformer … Read more