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DC MOTOR BASICS

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DC MOTOR BASICS

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    2. Purpose of an “DC Motor”

    3. Ohm’s Law

    4. Bar Magnet

    5. Magnetic Poles

    6. Current Carrying Conductor

    7. Electromagnetic Coil

    8. Electo-magnetic Coils

    9. DC Motor Rotation Considerations Speed Torque

    10. Speed

    11. Torque

    12. DC Motor 1) Armature - coils of wire on the shaft 2) Field (Shunt Field) - coils of wire built into stationary frame

    13. DC MOTOR CONSTRUCTION

    14. Force Effect of Magnetic Fields

    15. Force Couple

    16. Mechanical Effects of Magnetic Fields

    18. Principle of a DC Motor A DC motor has two independent electromagnetic fields Controlled independent of each other Either field can influence the performance of the motor Speed (rpm) Torque (ft lb)

    20. Typical DC Motor

    21. DC Motor

    22. Commutator

    23. Brush Rig Assembly

    24. DC Motor Commutator/Armature

    25. Motor General Equation

    26. DC Motor Speed

    27. DC Motor Torque

    28. DC Motor Horsepower

    29. Speed Power Curve

    31. Types of DC Motors Shunt Wound Straight Shunt Compound Wound Stabilized Shunt Permanent Magnet Series Wound

    32. DC Motor Review Speed is primarily determined by Armature Voltage Torque is determined by Armature Current

    33. DC Motor Review Rotation is the result of the interaction of two independent electromagnetic fields. Armature windings Field windings Extended motor speeds above base speed are achieved by reducing the field voltage (current) Field Weakening

    34. Questions ???

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