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- 1. Electric motor -miracle of applied physics? Adam Jerzman UNIWERSYTET KARDYNAŁA STEFANA WYSZYŃSKIEGO WYDZIAŁ BIOLOGII I NAUK O ŚRODOWISKU ajjm314@gmail.com
- 2. Table of Contents: 1.What’s an electric motor? 2. How electric motor works? 3. Genesis of electric motor 4. Power calculation 5. Characteristic of electric motors and usage 6. Comparison and division of electric motors
- 3. What is anelectric motor? An electric motor is an electrical machine that converts electrical energy into mechanical energy. The reverse of this is the conversion of mechanical energy into electrical energy and is done by an electric generator, which has much in common with a motor.
- 4. Principle of working Mostelectric motors operate through the interaction between an electric motor's magnetic field and winding currents to generate force. In certain applications, such as in regenerative braking with traction motors in the transportation industry, electric motors can also be used in reverse as generators to convert mechanical energy into electric power. Electric motors are used to produce linear or rotary force (torque), and should be distinguished from devices such as magnetic solenoids and loudspeakers that convert electricity into motion but do not generate usable mechanical powers, which are respectively referred to as actuators and transducers.
- 6. Genesis of theelectric motor
- 7. Perhaps the firstelectric motors were simple electrostatic devices created by the Scottish monk Andrew Gordon in the 1740s. The theoretical principle behind production of mechanical force by the interactions of an electric current and a magnetic field, Ampère's force law, was discovered later by André-Marie Ampère in 1820. The conversion of electrical energy into mechanical energy by electromagnetic means was demonstrated by the English scientist Michael Faraday in 1821.
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- 9. A free-hanging wirewas dipped into a pool of mercury, on which a permanent magnet (PM) was placed. When a current was passed through the wire, the wire rotated around the magnet, showing that the current gave rise to a close circular magnetic field around the wire. This motor is often demonstrated in physics experiments, brine substituting for toxic mercury. Though Barlow's wheel was an early refinement to this Faraday demonstration, these and similar homopolar motors were to remain unsuited to practical application until late in the century. https://en.wikipedia.org/wiki/File:Stator_and_rot or_by_Zureks.JPG
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- 11. Power calculation Pem = rpmx T/5252 Pairgap = (Rr /S) x Ir 2
- 14. Electric motors AC asynchronous motors Self-commutated motors BrushedDC Brushless DC AC polyphase AC SCIM
- 15. Type Advantages DisadvantagesOutput Brushed DC Low initial cost Simple speed control Medium lifespan Rectifier, linear transistor(s) or DC chopper controller. Brushless DC Long lifespan High efficiency Higher initial cost Synchronous
- 16. Literature ● Fink, DonaldG.; Beaty, H. Wayne, Standard Handbook for Electrical Engineers, '14th ed., McGraw-Hill, 1999, ISBN 0-07-022005-0. ● Houston, Edwin J.; Kennelly, Arthur, Recent Types of Dynamo-Electric Machinery, American Technical Book Company 1897, published by P.F. Collier and Sons New York, 1902 ● Kuphaldt, Tony R. (2000–2006). "Chapter 13 AC MOTORS". Lessons In Electric Circuits—Volume II. Retrieved 2006-04-11. ● Rosenblatt, Jack; Friedman, M. Harold, Direct and Alternating Current Machinery, 2nd ed., McGraw-Hill, 1963