Electromagnetism A study of the relationship between magnets & electricity.
The Direct Current (DC) Electric Motor What you need to know: -Electromagnetism - main parts of the...
-
Upload
john-addicott -
Category
Documents
-
view
216 -
download
2
Transcript of The Direct Current (DC) Electric Motor What you need to know: -Electromagnetism - main parts of the...
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 MotorIf 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 andField 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.
Principles_Of_Starting.mp4
The DC Motor Principle
• A Short video explaining the interaction of magnetic fields between the armature and field coils.
DC_Motor_Principle_1.flv
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.