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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