Starting of Induction Motor (1).pdfdfsdfdd
- 1. STARTING OF INDUCTION MOTOR Presented by, Akash Das ET193052 Course Title: General Viva-Voce Course Code: EEE-4822 Submitted to, Muhammad Athar Uddin Associate Professor Dept. Of EEE, IIUC
- 2. Contents ➢ Introduction ➢ Induction Motor ➢ Principal Parts ➢ Types of Induction Motors ➢ Working Principle ➢ Starting Methods for Induction Motors ➢ Uses of Induction Motors
- 3. Introduction The most important inventions of the modern science is the Induction Motor. From powering our homes and offices to driving industrial machinery, induction motors have become an integral part of our lives. But what exactly is an induction motor, and why is it so important? Let's find out, This Photo by Unknown author is licensed under CC BY-SA.
- 4. What is an Induction Motor? An induction motor is a type of electric motor that operates on the principle of electromagnetic induction. It consists of a stator, which is a stationary component, and a rotor, which rotates inside the stator. The stator contains a set of windings that are supplied with alternating current (AC) electricity. This current produces a magnetic field that induces a current in the rotor windings, causing the rotor to rotate.
- 5. Principal Parts An induction motor consists of two main parts, 1.The stator 2.The rotor The stator is the stationary part of the motor, while the rotor rotates within it. The stator contains the primary winding, which is connected to an AC power source. The rotor has a secondary winding, which is induced with a current by the magnetic field created by the primary winding. The rotation of the rotor is due to the interaction between the magnetic fields of the stator and the rotor.
- 6. Types of Induction Motors There are two main types of induction motors, 1.Single-phase 2.Three-phase Single-phase induction motors are used in small appliances and machines, such as fans, washing machines, and vacuum cleaners. They are less efficient than three-phase motors and have lower power output. Three-phase induction motors are used in larger machines and equipment, such as pumps, compressors, and conveyors. They are more efficient and have higher power output than single- phase motors. Single-phase Three-phase
- 7. Working Principle The working principle of an induction motor is based on the interaction between the magnetic field of the stator and rotor. When an AC voltage is applied to the stator winding, a rotating magnetic field is produced in the air gap between the stator and rotor. This rotating magnetic field induces a voltage in the rotor windings, which in turn produces a current that creates a magnetic field in the rotor. The interaction between the two magnetic fields causes the rotor to rotate.
- 8. The Starting methods for Induction Motors The starting methods for single-phase and three-phase induction motors are different due to the nature of their windings and the challenges they pose during starting. Let's take a look at each, Starting of Single-Phase Induction Motor: Single-phase induction motors are not self-starting . They require additional mechanisms to initiate rotation. There are various methods to start a single- phase induction motor, but the two most common methods are: 1.Split-Phase Induction Motor & 2.Capacitor-Start Induction Motor
- 9. Starting of Three-Phase Induction Motors Starting of Three Phase Induction Motors: Three-phase induction motors are self-starting due to the rotating magnetic field produced by the balanced three-phase supply. There are three main methods used to start an induction motor, 1.Direct-on-line starting & 2.Star-Delta starting
- 10. Starting of Single-Phase Induction Motors Split-Phase Induction Motor: This method uses a special winding arrangement with two windings: the main winding and the auxiliary or starting winding. The starting winding is equipped with a phase shift relative to the main winding. This phase difference creates a rotating magnetic field, which allows the motor to start and run in a particular direction. Capacitor-Start Induction Motor: In this method, a capacitor is connected in series with the starting winding. The capacitor introduces a phase shift, creating a rotating magnetic field that enables the motor to start and run in a specific direction. Once the motor reaches a certain speed, a switch disconnects the starting winding and capacitor from the circuit.
- 11. Starting of Three-Phase Induction Motors Direct-On-Line Starting Direct-on-line starting is a method used to start induction motors. It involves connecting the motor directly to the power source, which causes a surge of current and torque that can be damaging to the motor and the connected equipment. However, this method is simple and cost-effective, making it a popular choice for many applications.
- 12. Starting of Three-Phase Induction Motors Star-Delta Starting The star-delta starting method is a common way of starting induction motors, particularly in applications where high starting torque is required. This method involves connecting the motor windings in a star configuration during starting, and then switching to a delta configuration once the motor has reached full speed.
- 13. Uses of Induction Motors • Induction motors are widely used in various industrial, commercial, and residential applications due to their simplicity, reliability, and cost-effectiveness. Some of the most common uses of induction motors include • Industrial Applications: Induction motors are extensively used in industries for driving various types of machinery and equipment, such as pumps, fans, compressors, conveyor systems, mixers, and blowers. • Commercial Buildings: Induction motors are used in HVAC (Heating, Ventilation, and Air Conditioning) systems to power air handling units, chillers, and cooling towers. They are also found in escalators and elevators for vertical transportation.
- 14. Uses of Induction Motors • Residential Applications: In households, induction motors are present in various appliances like washing machines, refrigerators, air conditioners, and kitchen exhaust fans. • Agriculture: Induction motors drive irrigation pumps and other agricultural machinery used for water supply, irrigation, and crop processing. • Automotive Industry: In the automotive sector, induction motors are used in electric vehicles (EVs) and hybrid vehicles for propulsion. These are commonly known as induction or AC motors used in electric cars.
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