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The Direct Current (DC) Electric Motor

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Presentation on theme: "The Direct Current (DC) Electric Motor"— Presentation transcript:

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 and Field 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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