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Transcript
Outline
u Early
Sources Of Electrical Energy
u Mechanical Generators Of Electricity
u Dynamo-Electric Generators
u Gramme Armature & Successors
u Alternator
u Electric Lighting
u Power Stations
u Batteries
ELECTRICAL POWER
Early Sources Of Electrical Energy
u Electro-Statics
t Frictional Machines Using Glass Cylinders
u Electro-Chemistry
t Chemical Effects Of An Electric Current
Allesandro Volta (1745-1827)
Voltaic Pile
1800
u Electricity Generated In A
Battery
u
u
t Zinc (Z)
u Alessandro
Volta
u ElectroElectro-Magnetics
Magnetics
t Silver (A) Or Copper
t Flannel Or Paper
w
w
u
Electro-magnetics
Electromagnetics
u H.
C. Oersted (1771-1851)
t Danish Scientist - 1820
t Magnetic Needle Moved In Vicinity Of A Conductor
Carrying Electricity
t Magnetic Field Surrounding A Conductor Carrying
Electricity
u A.
M. Ampere (1775-1836)
t Electro-Dynamic Interaction Of Electric Currents &
Magnets
t Commutator
Current Trough Wire
Electro-magnetics
Electromagnetics (continued)
u D.
f. J. Arago (1786-1853)
t Produced First Electro-Magnet (1820)
u W.
Sturgeon (1783-1850)
t First Practical Electro-Magnet (1825)
u Michael
Faraday (1791-1867)
t “Convert Magnetism Into Electricity”
t Electro-Magnetic Induction (1831)
t Not Interested In Commercialism
First Mechanical Generators Of
Electricity
Principles
Pixii
u Saxton
u Clarke
Basic Principles
uA
Conductor Carrying Electricity Produces A
Magnetic Field Surrounding It
u Basic
t If Conductor Is Coiled Around Iron
u Hippolyte
w
t If Iron Is Hardened By Hammering
w
u Electric
Generators
t Field System
w
t Coil System
w
t Relative Movement Between Systems
Hippolyte Pixii
First Magneto-Electric
Machine
u 1832
u Hand-Driven
u Only Working Model
u Field Magnet Revolves
Relative To Coil
u First Practical Application
Of Faraday’s Principle
u
Magneto-Electric Machines
u Saxton
w
w
u Pixii
(1833)
t Added Commutator - Based On Ampere’s Work
t Converted Oscillating Current To Unidirectional
Current
E. M. Clarke
Owned Company Making
Scientific Instruments
u First Manufacturing On
Commercial Scale
(1833)
t Arrangement Of Components Was Reversed
Stoehrer Of Leipzig
u
t 1834
Coils Rotated In Plane
Parallel To Side Of Magnet
u Experimented With Types
Of Windings
u
1846
Three Horseshoe
Shaped Magnets
u Six-Polar Armature
u Science Museum Of
London
u
u
F. Nollet (1794-1853)
Frederick Hale Holmes
u Tested
u
First To Contemplate
Making A Power-Driven
Magneto-Electric Machine
t Supply Relatively Large
Output
t Lighthouses
t Died Before Completion
u
Frederick Hale Holmes
Continued Work
On Small Scale
t Trinity House Wharf to Woolrich On Thames
u Components
t 36 U-Shaped Magnets In Pairs Of Six
t Poles Outward
t Stationary Coils & Commutator
u Size
- 5’ Square & 2 tons
u Output
t Driven By Steam Engine At 600rpm
t 1.5 kw