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The Direct Current (DC) Electric Motor

The Direct Current (DC) Electric Motor. What you need to know: Electromagnetism main parts of the motor Flow of electricity through the motor interaction of opposing magnetic fields. Starting Motor Fundamentals.

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The Direct Current (DC) Electric Motor

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  1. The Direct Current (DC) Electric Motor What you need to know: Electromagnetism main parts of the motor Flow of electricity through the motor interaction of opposing magnetic fields

  2. Starting Motor Fundamentals • An automobile uses many DC motors in various systems. The main application of a DC motor is the engines starter motor. What the starter motor does: • Converts electrical energy from the battery to mechanical energy to crank the engine • Produces a turning force through the interaction of magnetic fields inside the motor

  3. Magnetic Field Action • Made up of invisible lines of force • Since like charges (fields) repel each other and unlike charges (fields) attract each other, magnetic fields can produce motion

  4. Magnetic Field Action

  5. Simple Electric Motor If a current-carrying winding is placed inside a magnetic field, the winding rotates away from the pole shoes

  6. Commutator and Brushes • Keep a motor turning by controlling the current through the windings • Together, they serve as a sliding contact between battery power and the windings

  7. Commutator and Brushes Commutator reverses the electrical connection when the loop rotates around

  8. Increasing Motor Power • Several loops of wire and a commutator with many segments are used to increase motor power • As the motor spins, many windings contribute to the motion

  9. Armature • Supports the windings • Iron core increases the strength of each winding’s magnetic field

  10. Field Windings • Stationary insulated wire wrapped in a circular shape around iron pole shoes • When current flows, a magnetic field builds • This field acts against the armature’s field, producing motion

  11. Armature andField Windings

  12. Know this diagram and be able to label these parts This is a cutaway view of a starter motor.

  13. The Starter Motor Circuit • A short video on the automobiles starter motor circuit.

  14. The DC Motor Principle • A Short video explaining the interaction of magnetic fields between the armature and field coils.

  15. What to Know for the Exam • For the exam you will need to know: • 1. basic components: armature, pole shoes/field coils, commutator, brushes, solenoid • 2. Be able to explain the basic dc motor principle….how magnetism is formed, and how opposing magnetic poles create rotation in the motor.

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