File Name: construction and working of 3 phase induction motor .zip
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. 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. Although traditionally used in fixed-speed service, induction motors are increasingly being used with variable-frequency drives VFD in variable-speed service. VFDs offer especially important energy savings opportunities for existing and prospective induction motors in variable-torque centrifugal fan, pump and compressor load applications. Squirrel-cage induction motors are very widely used in both fixed-speed and variable-frequency drive applications.
Some of the advantages like low cost, rugged design less complex, and easy to maintain AC motors results in many of the industrial operations are performed with the use of AC drives than DC drives. AC induction motor is a special type of electric motor having its own typical characteristics and performance in terms of starting, speed control, protections, and so on. The performance over a wide range of applications makes three-phase induction motors accountable for 85 percent of the installed capacity of the industrial driving systems. The three-phase AC induction motor is a rotating electric machine that is designed to operate on a three-phase supply. This 3 phase motor is also called as an asynchronous motor.
The induction motor rotates due to the rotating magnetic field in 3 phase induction motor, which is produced by the stator winding in the air gap between in the stator and the rotor. The stator has a three phase stationary winding which can be either star connected or delta connected. Therefore, the induction motor is the most important motor among all other types of motor. Induction motor model. Motor failures are mainly divided into three groups: electrical, mechanical, and environmental. The bars forming the conductors along the rotor axis are connected by a thick metal ring at the ends, resulting in a short circuit as shown in Figure 1. An electrical motor is an electromechanical device that converts electrical energy into mechanical energy.
The motor is used to convert an electrical form of energy into mechanical form. According to the type of supply, motors are classified as AC motors and DC motors. In today post, we will discuss the different types of three phase induction motors with working and applications. Therefore, the induction motor is the most important motor among all other types of motor. What is a 3-Phase Induction Motor?
Principle of Operation A rotating field is set up in the stator when a 3- Phase supply is given. The stationary rotor cut the revolving. Working Principle of AC Motors. Induction motor works on the principle that whenever a closed conductor is placed in a magnetic field. Electric motor - Electric motor - Construction of induction motors: The stator When operated from a constant-frequency supply the three-phase induction motor. The rotor of a three phase induction motor can never attain synchronous speed.
Single phase induction motors generally have a construction similar to that of a three phase motor: an ac windings is placed on the stator, short-circuited conductors are placed in a cylindrical rotor. The significant difference is, of-course, that there is only a single phase supply to the stator. Consider the motor schematic shown in Fig. If an ac supply is connected to the stator winding, a pulsating flux density will be produced, which will link the rotor circuits. The voltage induced in the rotor circuits will cause a current to flow, producing a flux density to oppose change in the stator flux linking the circuit. In the diagram above, both the stator and rotor flux densities will act in the y-direction.
Principle and Working Of 3 Phase Induction Motor. When 3 phase supply is given to the motor, the resulting current generates a magnetic flux “Ø”.
Ed Edwards. Three-phase motors also annotated numerically as 3-phase motors are widely used in industry and have become the workhorse of many mechanical and electromechanical systems because of their relative simplicity, proven reliability, and long service life. Three-phase motors are one example of a type of induction motor, also known as an asynchronous motor, that operates using the principals of electromagnetic induction. While there are also single-phase induction motors available, those types of induction motors are used less frequently in industrial applications but are widely used in domestic applications such as in vacuum cleaners , refrigerator compressors, and air conditioners , owing to the use of single-phase AC power in homes and offices.
Click Here To Download Now. The popularity of 3 phase induction motors onboard ships is because of their simple, robust construction, and high-reliability factor in the sea environment. An induction motor can be used for different applications with various speed and load requirements. Induction motors are used in almost all machinery system of the ship such as crane motor, propulsion motor, blower motor, seawater pump motor, and even small synchronous motor. An induction motor or asynchronous motor is an AC 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.
Facebook Twitter. Three Phase Induction Motor:. The three phase induction motors are the most widely used electric motors in the industry. They run at essentially constant speed from no-load to full-load. However, the speed is frequency dependent and consequently, these motors are not easily adapted to speed control. We usually prefer dc motors when large speed variations are required.
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The stator frame consists of laminations of silicon steel, usually with a thickness of about 0.Reply
Like any electric motor, a 3-phase induction motor has a stator and a hampdenlodgethame.org stator carries a 3-phase winding (called stator winding) while the rotor carries a.Reply
The stator of three phase induction motor is made up of numbers of slots to construct a 3 phase winding circuit which we connect with 3 phase AC.Reply
The rotor consists of numbers of slots and rotor winding are placed inside these slots. The three end terminals are connected together to form a.Reply