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The document discusses electric motors and their basic components and classifications. It explains that electric motors convert electrical energy to mechanical energy using the interaction between a magnetic field and a current-carrying conductor. Motors are classified as alternating current or direct current based on their power supply. Direct current motors can be easily controlled but require brushes that wear out over time. The key components of a motor are identified as the stator, rotor, bearings, housing, and commutator. Smallest motors are found in watches while largest are used for ship propulsion.
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This document provides an overview of DC machines including their history, evolution, basic construction, and how they work. It discusses the key components of a DC machine such as the yoke, poles, armature, field and armature windings, commutator, and brushes. It also covers Fleming's rule, the two types of armature windings, how a DC motor works by creating a magnetic field to rotate the rotor, different types of DC motors including brushed and brushless, and their applications. Losses in DC motors and generators are also briefly discussed.
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Anushika Kapoor submitted a physics project report on AC generators to her teacher Mr. Vipin Mishra. The report describes the key components of an AC generator including the coil, magnetic field, slip rings, and brushes. It explains the working principle of electromagnetic induction and how an alternating current is produced as the coil rotates perpendicularly to the magnetic field. Applications of AC generators include bicycles, electric scooters, microwaves, and sailboats.
Electric motors and generators.ppt
The document discusses various types of electric motors and generators. It begins by introducing generators, which convert mechanical energy to electrical energy, and motors, which convert electrical energy to mechanical energy. It then provides details on simple AC and DC generators, DC generators/dynamos, AC generators/alternators, DC motors, AC motors including synchronous and induction motors, and universal motors. Key points are summarized at the end.
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PresentationECE
- 1. ECE131 BASIC ELECTRICAL AND ELECTRONICS ENGINEERING By : Section: K-1613 Roll Number Name Registration Number 41 Abhinav Dwivedi 11606717
- 2. AnElectricmotorisa machinewhichconvertselectric energyintomechanicalenergy.Itsactionisbasedonthe principlethatwhena current-carryingconductorisplacedina magneticfield,it experiencesa mechanicalforcewhose directionis givenby Fleming’sLeft-handRuleandwhose magnitudeisgivenby F = BIlNewton.
- 4. • Used to turn fans, pumps and compressors • Facilitate the circulation of air, water, refrigerant and other fluids • Motors are designed for particular applications • The correct motor must always be used • Most motors operate on similar principles
- 5. Classification Based On Power Supply: 1. Alternating Current (AC) Motors. 2. Direct Current (DC) Motor.
- 6. 1.It is easy to control their speed in a wide range For example, motors for driving rail vehicles were, until recently, exclusively DC machines. 1.Since they need brushes to connect the rotor winding. Brush wear occurs, and it increases dramatically in low‐pressure environment.
- 7. (a) Synchronous Motors (b) Asynchronous Motors (a) Shunt-wound motor (b) Series-wound motor (c) Compound motor
- 8. • Stator with motor windings – Stationary portion of the motor • Rotor – Rotating portion of the motor • Bearings – Allow free rotation of the motor shaft • End bells – Supports the bearings and/or shaft • Housing – Holds all motor components together and facilitates motor mounting • YOKE -The outer frame or yoke serves double purpose. • Pole Shoes -The field magnets consists of pole cores and pole shoes. • Field Coils-The field coils or pole coils, which consist of copper wire of strip, are former-wound for the correct dimension. • Armature windings -The armature windings are usually former-wound.
- 9. • Commutator - The function of Commutator is to facilitate collection of current from the armature conductors in case of generator i.e. as rectifier and in case of motor which can provide current to the armature conductors i.e. as an inverter. • Brushes and Bearings - The Brushes, whose function is to collect current from Commutator or to supply current to Commutator as in the case of generator and motor respectively, are usually made of carbon or graphite and are in the shape of a rectangular block.
- 11. • The interaction between the magnetic field and current carrying conductor is explained by Fleming’s right hand rule.
- 12. Smallest motors can be found in • Electric wrist watches Medium size motors can be found • To provide convenient mechanical power for industrial use The very largest electric motors are used • for propulsion of ships, pipeline compressors, and water pumps with ratings in the millions of watts.
- 13. Rotor of DC motor
- 14. Applications of DC Motors
- 16. ECE131 BASIC ELECTRICAL AND ELECTRONICS ENGINEERING By : Section: K-1613 Roll Number Name Registration Number 41 Abhinav Dwivedi 11606717