What is circle diagram of induction motor?

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.

How do you draw a circle diagram?

Construction of the Circle Diagram

Take the phasor voltage V1 along the y-axis. Choose a convenient current. With O as origin, draw a line OO’ = I0 at an angle ϕ0 with V1. Draw the line OKN perpendicular to V1.

What is power circle diagram?

Heyland in 1894 and B.A. Behrend in 1895, the circle diagram is the graphical representation of the performance of the electrical machine drawn in terms of the locus of the machine’s input voltage and current. The circle diagram can be drawn for alternators, synchronous motors, transformers, induction motors.

What is induction motor and how it works?

An induction motor or asynchronous motor is an AC electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding. An induction motor can therefore be made without electrical connections to the rotor.

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What are the main parts of an induction motor?

Electric motor designs can vary quite a lot, though in general they have three main parts: a rotor, a stator and a commutator. These three parts use the attractive and repulsive forces of electromagnetism, causing the motor to spin continually as long as it receives a steady flow of electric current.

What is a circle diagram called?

A Venn diagram is an illustration that uses circles to show the relationships among things or finite groups of things. Circles that overlap have a commonality while circles that do not overlap do not share those traits. Venn diagrams help to visually represent the similarities and differences between two concepts.

What is the importance of 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.

What is meant by constant power circle for synchronous motor?

The circle drawn with centre as O’ and radius as O’B represents circle of constant power. … Thus if excitation is varied while the power is kept constant, then working point B while move along the circle of constant power.

How does an induction motor start?

When the supply is connected to the stator of a three-phase induction motor, a rotating magnetic field is produced, and the rotor starts rotating and the induction motor starts. … At the time of starting, the motor slip is unity, and the starting current is very large.

What are the applications of induction motor?

AC induction motors are the most common electric motors in the world. These simple, reliable and economical motors are found in refrigerators, washing machines and furnaces, as well as conveyors, pumps, winders, wind tunnels and other industrial equipment.

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What are the advantages of induction motor?

Induction Motor Advantages:

  • Induction motors are simple and rugged in construction. …
  • Induction motors are cheaper in cost due to the absence of brushes, commutators, and slip rings.
  • They are maintenance free motors unlike dc motors and synchronous motors due to the absence of brushes, commutators and slip rings.

What is induction motor principle?

The motor which works on the principle of electromagnetic induction is known as the induction motor. The electromagnetic induction is the phenomenon in which the electromotive force induces across the electrical conductor when it is placed in a rotating magnetic field.

Why starter is used in induction motor?

The three phase induction motors are self-starting due to rotating magnetic field. But the motors show tendency to draw very high current at the time of starting. … Hence there should be a device which can limit such high starting current. Such a device which limits high starting current is called a starter.11 мая 2017 г.

Which type of winding is induction motor?

The most used winding type for medium-size induction motors is a double layer winding with pitched winding step, for example pitched for two stator slots (Fig. 2). Significant advantage of the aforementioned winding is a smaller mass of inserted copper because of shortest winding-ends.