Electric motor and dynamo
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Electric Motor and Dynamo. Inventor: Michael Faraday. Michael Faraday. Renowned physicist and chemist Best known for the discovery of electromagnetic induction and the first two laws of electrolysis

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Inventor michael faraday
Inventor: Michael Faraday

Michael faraday
Michael Faraday

  • Renowned physicist and chemist

  • Best known for the discovery of electromagnetic induction and the first two laws of electrolysis

    • 1st law: the amount of chemical change produced by a current is proportional to the quantity of electricity passed

    • 2nd law: the quantities of substances liberated or deposited of the electrode by the passage of a given quantity of electricity (current) are proportional to the chemical equivalent weights of those substances

  • 1821: Built two devices to produce what he called electromagnetic rotation:

    • Continuous circular motion from the circular magnetic force around a wire

  • 1831: using induction ring he discovered the electromagnetic induction: the generation of electricity in a wire by means of the electromagnetic effect

    • This induction ring was the first electric transformer

  • September 1831: discovered magneto-electric induction: electromagnetic rotation:

    • Attached two wires through a sliding contact to a copper disc, he rotated the disc between the poles of a horseshoe magnet and obtained a continuous direct current

    • This was the first generator

  • 1832: he proved that the electricity induced from a magnet, voltaic energy produced by a battery, and static electricity are all the same

  • He was also partly responsible for coining terms such as electrode, cathode and ion.

  • Gave his name to the farad, originally describing a unit of electrical charge but later a unit of electrical capacitance.

Historical survey

Historical Survey electromagnetic rotation:

Jedlik s dynamo
Jedlik’s electromagnetic rotation: Dynamo

  • 1827

  • Hungarian physicist AnyosJedlik

  • Experimentation with electromagnetic rotating devices called self rotators

  • Siemens and Wheatstone

Faraday s law and disc
Faraday’s Law and Disc electromagnetic rotation:

  • 1831-1832

  • Law: an electromotive force is generated in an electrical conductor that encircles a varying magnetic flux.

  • First electromagnetic generator called Faraday Disc

Hippolyte pixii
Hippolyte electromagnetic rotation:Pixii

  • First official dynamo

  • Industrial sized companies

  • Commutator

  • Discovery of DC electric motor, AC alternator, AC synchrononous and rotary converter.

Electric motor
Electric Motor electromagnetic rotation:

  • Converts electrical energy into mechanical energy

  • Operates through magnetic fields and conductors to generate force

Electric motor1
Electric Motor electromagnetic rotation:

  • When an electric current is passed through a wire loop in a magnetic field, the loop will rotate and the rotating motion is transmitted to a shaft providing useful mechanical work.

Electric motor2
Electric Motor electromagnetic rotation:

  • Used for:

    • Pump impeller

    • Fan

    • Lifting materials

Dynamo electromagnetic rotation:

  • Produces electrical energy from mechanical energy

  • Another name is electrical generator

Dynamo electromagnetic rotation:

  • First electrical generators capable of delivering power for industry

Dynamo electromagnetic rotation:

  • Uses rotating coils of wire and magnetic fields to convert mechanical rotation into a pulsing direct electric current.

Construction and parts

Construction and Parts electromagnetic rotation:

Stator electromagnetic rotation:

  • 2 Permanent Magnets


Rotor electromagnetic rotation:

  • Also know as the armature.

Other electric motors
Other Electric Motors electromagnetic rotation:

  • http://www.wisc-online.com/objects/ViewObject.aspx?ID=IAU9508

Types of motors

Types of Motors electromagnetic rotation:



Universal Motors

Dc motors
DC Motors electromagnetic rotation:

Direct current

Brush motor

Angular momentum

Brushless motor

Rotating switch

Used for refined speed

Ac motors
AC Motors electromagnetic rotation:

Alternating current

Synchronous motors

Rotor and alignment of stator field

Asynchronous motors


Universal motors
Universal Motors electromagnetic rotation:

AC and DC

Higher watt motor

The future

The Future electromagnetic rotation:

The future1
The Future electromagnetic rotation:

  • Decreases in Size

  • Nanometer; molecular motors

  • 1/60,000 as thick as human hair

The e lectric vehicle
The electromagnetic rotation:Electric Vehicle

  • Trying to develop the self sufficient vehicle

  • Tesla motorcars

  • Hybrid motor and electric vehicles