Essay on Torque: Electric Motor and Magnetic Field

Submitted By Will-Hammond

Words: 311

Pages: 2

Open Document

TORQUE

Torque is produced from the rotational motion. Torque is equal to force times the radius through which it moves.
The torque developed T is given-

Initially when the motor starts, the slip is high. The torque produced is proportional to the speed. However when the motor attains stable speed, slip is negligible and the torque is inversely proportional to the speed.

The shaft of a induction motor rotates because of the torque produced by the interaction between the magnetic field of the stator and the magnetic field in the rotor. The amount of torque produced by the motor is determined by how stron the magnetic fields are. The strength of the stator field remains fairley constant altoough the strength of the rotors field changes causing the torque to vary.

The moment the stator is energised the stators magnetic field is produced and begins to rotate, although the rotor remains stationary. At this moment in time the positions of the rotor and stator magnetic fields couldn’t be any more different. Maximum voltage is induced into the rotor and the resultant magnetic field is at its strongest and large amount of torque is created. The large amount of torque is good because a large torque is needed to overcome the stationary weight of the load.

As the rotor comes close to the synchronous speed of the stator field less voltage is induced into the rotor so its magnetic field weakens so less torque is developed.

When the speed of the rotor stabilizes to a

Essay on Motor: Electric Motors

An electric motor is an electric machine that converts electrical energy into mechanical energy. In normal motoring mode, most electric motors operate through the interaction between an electric motor's magnetic field and winding currents to genelectric motor is an electric machine that converts electrical energy into mechanical energy. In normal motoring mode, most electric motors operate through the interaction between an electric motor's magnetic field and winding currents to generate force…

Words 908 - Pages 4

Toy Motor Presentation Essay

10-135 Toy Motor Assembly JIMARA ABDULAZIZ D r. Fa t m a A r s l a n UTSA Electrical and Computer Engineering Introduction The Universal motor is a type of electric motor that can operate on both AC or DC power. The motor is a device that converts electrical energy into mechanical energy. The electric motor is very common in our everyday lives. Parts & Tools  Two Wire,100 cm Long Coil.  Three Fasteners.  Two Armature Halves  Tubing.  Motor Shaft.  Two Brushes.  Field Pole.  Wire…

Words 474 - Pages 2

Motor Design: Motor Theory: How Our Motor Works

Claire Fredrickson Motor Design, Construction, Troubleshooting, and Testing Lab Report 1. Motor Theory: How our Motor Works An el ectric motor is all about magnets and magnetism: A motor uses magnets to create motion. The fundamental law of all magnets states: Opposites attract and likes repel. So if you have two bar magnets with their ends marked "north" and "south," then the north end of one magnet will attract the south end of the other. On the other hand, the north end of one magnet…

Words 2022 - Pages 9

Physics Investigation Essay

2015). Electric Vehicle’s include road and rail vehicles, surface and underwater vessels, electric aircraft and electrically powered space vehicles. Electricity is being considered as an alternative to petroleum fuels as an energy source (Skwirk, 2015). A pure battery electric vehicle is considered a more efficient alternative to hydrogen fuel propelled vehicle as there is no need to convert energy into electricity since the electricity stored in the battery can power the electric motor (Hofstra…

Words 1411 - Pages 6

Essay about Physics Preliminary

HSC Physics Notes – Motors and Generators 9.3 - 1. Motors use the effect of forces on current-carrying conductors in magnetic fields 1. discuss the effect on the magnitude of the force on a current-carrying conductor of variations in – the strength of the magnetic field in which it is located Force is proportional to the magnetic field strength (B). i.e. ↑F = ↑B – the magnitude of the current in the conductor The force is proportional to the current (I) in the conductor. i.e. ↑F = ↑I – the length…

Words 7004 - Pages 29

Dc Motor Principle of Operation Essay

Principles of operation In any electric motor, operation is based on simple electromagnetism. A current-carrying conductor generates a magnetic field; when this is then placed in an external magnetic field, it will experience a force proportional to the current in the conductor, and to the strength of the external magnetic field. As you are well aware of from playing with magnets as a kid, opposite (North and South) polarities attract, while like polarities (North and North, South and South) repel…

Words 983 - Pages 4

Electromagnetism

Level p314-327, 335-346 Key Words: Magnetic force, Magnetic flux density, Tesla, Fleming’s left-hand rule, Top balance, Current balance, Hall probe, Electric Motor 7.1 Force on a current carrying conductor in a magnetic field and Fleming’s left-hand rule Definition of Magnetic flux density B Magnetic flux density is the force per unit current per unit length acting on a conductor placed at 90° to the field.…

Words 1410 - Pages 6

Vn Phys Stuff Essay examples

Four-Dimensional Space-Time 6 Mass Increase 6 Mass and Energy 6 Future Space Travel 7 Electric Motors and Generators 8 Introduction 8 Electric Charges in Magnetic Fields 8 Conductors Carrying a Current in a Magnetic Field 8 Two Parallel Wires Carrying Current 8 Designing Electric Motors 9 Moving a Conductor in a Magnetic Field 9 What Happens in the External Circuit? 10 Electromagnetic Induction Using a Coil and a Magnet…

Words 3539 - Pages 15

Essay On Electric Motors

the electrical connection creating a magnetic field which pulls the armature to the centre of the coil. When the armature moves up, the spring is compressed and the valve open. When current flow ceases, the armature moves down and the spring expands. This causes the valve to close. Electric motors Electric motors are divided into:  A.C. (Alternating Current) motors  D.C. (Direct Current) motors A.C. motors are mainly used to generate high power output or torque. It is least used due to its difficulty…

Words 1358 - Pages 6

What Are The Main Components Of A Generator

generator Description Rotor The rotor consists of a single loop of wire made to rotate within a magnetic field. It usually consists of several coils of wire wound on an armature. Armature The armature is a cylinder of laminated iron mounted on an axle. The axle is carried in bearings mounted on to the external structure of the generator. The rotor then spins by applying torque to the axle. Coil Each coil usually consists of many turns of copper wire wound on the armature.…

Words 347 - Pages 2