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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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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:
    • 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.
jedlik s dynamo
Jedlik’s 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
  • 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
  • First official dynamo
  • Industrial sized companies
  • Commutator
  • Discovery of DC electric motor, AC alternator, AC synchrononous and rotary converter.
electric motor
Electric Motor
  • Converts electrical energy into mechanical energy
  • Operates through magnetic fields and conductors to generate force
electric motor1
Electric Motor
  • 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
  • Used for:
    • Pump impeller
    • Fan
    • Lifting materials
  • Produces electrical energy from mechanical energy
  • Another name is electrical generator
  • First electrical generators capable of delivering power for industry
  • Uses rotating coils of wire and magnetic fields to convert mechanical rotation into a pulsing direct electric current.
  • 2 Permanent Magnets


  • Also know as the armature.
other electric motors
Other Electric Motors
  • http://www.wisc-online.com/objects/ViewObject.aspx?ID=IAU9508
types of motors

Types of Motors



Universal Motors

dc motors
DC Motors

Direct current

Brush motor

Angular momentum

Brushless motor

Rotating switch

Used for refined speed

ac motors
AC Motors

Alternating current

Synchronous motors

Rotor and alignment of stator field

Asynchronous motors


universal motors
Universal Motors

AC and DC

Higher watt motor

the future1
The Future
  • Decreases in Size
  • Nanometer; molecular motors
  • 1/60,000 as thick as human hair
the e lectric vehicle
The Electric Vehicle
  • Trying to develop the self sufficient vehicle
  • Tesla motorcars
  • Hybrid motor and electric vehicles