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# Li tony isu

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### Li tony isu

1. 1. How Stuff Works-Electric MotorBy Tony LiISU-TIJ101-03
2. 2. What is an electric Motor?An electric motor converts electric energy to rotational kinetic energyCan be AC(Alternating Current) or DC(Direct Current) motorUses magnets to create motionBased on one fundamental Law of Magnetism:Opposites Attract, Likes Repel
3. 3. HOW THE ELECTRIC MOTORFUNCTIONSHow Stuff Works-Electric Motor
4. 4. Transfers power to the commutatorThe spinning part of a motor, which carries the metal coilsHolds the armature and the commutatorReverses charge to the coils after every half rotationMain Parts of a MotorArmatureAxleBrushCommutatorField MagnetsPower SourceCreates a magnetic field that repels the coilsProvides power to the motor
5. 5. Main Parts of a Motor
6. 6. How the Parts ConnectThe battery provides electricity to the brushes, whichtransfers it to the commutatorsThe commutator provides the power to the coilsThe coils are charged the same as its corresponding fieldmagnetThe magnets repel the coils, making it spinAfter half a turn, the brushes will reverse the charge to eachcoil, continuing the rotational motion
7. 7. How Does the Brushand CommutatorWork?Red and Blue represent the 2chargesWhen it spins, the brushes(grey) alternate betweensending electricity to eachcommutatorThis pole reversal allows thespinning to continueThe brush is often the firstpart in a motor to wearout, due to friction between itand the commutators
8. 8. HISTORY OF THE ELECTRIC MOTORHow Stuff Works-Electric Motor
9. 9. -Michael Faraday makes a wire rotate by usingelectromagnetism-Hans Christian Oersted observes electromagnetic repulsionand attraction,-André-Marie Ampère invents the solenoid, a coil of wire thatproduces an electromagnetic field-William Sturgeon invents the electromagnetInvention of the Electric Motor1820182018211825-18261834-1835-William Ritchie builds a device with the first commutator andbrushesThomas Davenport and Orange Smalley buy a solenoid andcreate an electric rotary machine (patented in 1837)1832
10. 10. So who invented the electricmotor???Thomas Davenport is often hailed as the inventor of theelectric motorFirst to patent his design in AmericaIn Europe, better motors already existedMoritz Jacobi built a motor 3x as powerful as Davenport’s in1834, 3 years before Davenport patented his design
11. 11. USES OF THE ELECTRIC MOTORHow Stuff Works-Electric Motor
12. 12. What is the use of an electric Motor?Uses electricity to create movementOften used to create small amounts of kinetic energy, where gasolineengines are impractical (toy car motor)Motors have evolved to become more powerful and preciseIs even used in some cars, like hybrid and electric plug-in
13. 13. Generator-The Not-So-Evil Twin of the MotorThe exact opposite of a motorConverts kinetic energy into electrical energyA motor can also be used as a generator (and vice versa)It will be less efficient when used the other wayA motor will produce a current by simply spinning the motor
14. 14. ReferencesDoppelbauer, Martin. "The Invention of the Electric Motor 1800-1854." History -The Invention of the Electric Motor1800-1854. N.p., n.d. Web. 23 May 2013. <http://www.eti.kit.edu/english/1376.php>.Electric_Motor_Siemens_1MA7_0_18_13. Digital image. Alibaba.com. N.p., n.d. Web. 22 May 2013."How Electric Motors Work." HowStuffWorks. N.p., n.d. Web. 23 May 2013.<http://electronics.howstuffworks.com/motor.htm>.Howdcmotorworks_1269636862. Digital image. PBCheaven. N.p., n.d. Web. 22 May 2013.<http://www.pcbheaven.com/wikipages/How_DC_Motors_Work/>.Thomas_Davenport400. Digital image. Edison Tech Centre. N.p., n.d. Web. 23 May 2013.<http://edisontechcenter.org/DavenportThomas.html>.Template:By PresenterMedia.com and YourLogo