ch11 - Electricity And Electronics Fundamentals TECH 175...

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1 Electricity And Electronics Fundamentals TECH 175 Fall Semester 2007 Chapter 11 DC Motors 3 Outlines • Operating principles of dc motors • Counterelectromotive force • Identify various dc motors • Operation of motor starting circuits • Operation of various dc motors 4 Motor Operation Principles • A magnetic field exists between the north and south poles of a permanent magnet 5 Motor Operation Principles • An electromagnet is wound on an iron core • The core is placed on a shaft so it can rotate • This assembly is called the armature 6 Motor Operation Principles • The armature is placed in the permanent magnet field
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2 7 Motor Operation Principles • Ends of the armature coil are connected to commutators • Armature coil is energized from external power source • Armature coil is magnetized 8 9 10 Motor Operation Principles • North pole of the armature is repelled by the north pole of the field magnet • South pole of the armature is repelled by the south pole of the field magnet • The armature turns 90 o , one quarter of revolution 11 12 Motor Operation Principles • North pole of the armature is attracted by the south pole of the field magnet • South pole of the armature is attracted by the north pole of the field magnet • The armature turns another quarter turn
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ch11 - Electricity And Electronics Fundamentals TECH 175...

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