Presentation on theme: "The Direct Current (DC) Electric Motor What you need to know: -Electromagnetism - main parts of the motor -Flow of electricity through the motor - interaction."— Presentation transcript:
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 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
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
Magnetic Field Action
Simple Electric Motor If a current-carrying winding is placed inside a magnetic field, the winding rotates away from the pole shoes
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
Commutator and Brushes Commutator reverses the electrical connection when the loop rotates around
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
Armature Supports the windings Iron core increases the strength of each winding’s magnetic field
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
Armature and Field Windings
Know this diagram and be able to label these parts This is a cutaway view of a starter motor.
The Starter Motor Circuit A short video on the automobiles starter motor circuit.
The DC Motor Principle A Short video explaining the interaction of magnetic fields between the armature and field coils.
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.