Lec10 - 341 Energy Conversion

Lec10 - 341 Energy Conversion - Lec 10 DC AC Machinery...

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341 - Electric Machinery Fundamentals MI - 1 Lec 10 DC, AC Machinery Fundamentals & Rotating Magnetic Field Mahesh S. Illindala
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341 - Electric Machinery Fundamentals MI - 2 Objectives Knowledge: Identify different types of ac electric machines Comprehension: Discuss the reliability issues of brushes in dc electric machines Describe the principle of rotating magnetic field in an ac machine Application: Examine the various types of electric machines employed in the industry Analysis: Analyze the voltage and torque induced in an ac electric machine
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341 - Electric Machinery Fundamentals DC Machine Operating Characteristics MI - 3 ° ??? = ±²³ ´ µ ¶·¸ = ±²¹ Class Discussion – Toy Motors
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341 - Electric Machinery Fundamentals DC shunt R a I f E a + - V a I a Series field Shunt field V f DC series DC separately excited MI - 4
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341 - Electric Machinery Fundamentals DC Machine Features First practical electrical rotating machine Inherently straightforward operating characteristics – Induced voltage speed – Torque current Stable and Flexible performance Easier to control High efficiency Inexpensive Employed in low cost products with short lifetime/reliability requirements Issues Low reliability of the commutator / brush assembly Brushes have a limited life and cause the commutator to wear Because of making and breaking connections, there is sparking and electrical noise Brushes limit the maximum speed of the motor Brush dust can cause other maintenance problems MI - 5
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341 - Electric Machinery Fundamentals
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This note was uploaded on 04/01/2012 for the course ECE 341 taught by Professor Keyhani during the Fall '08 term at Ohio State.

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Lec10 - 341 Energy Conversion - Lec 10 DC AC Machinery...

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