teaching the concept of marlon flores sacedon visayas state university visca, baybay, leyte oct. 23,...

Teaching the Concept of Teaching the Concept of

Marlon Flores SacedonMarlon Flores SacedonVisayas State University

Visca, Baybay, LeyteOct. 23, 2009

Visayas State UniversityVisca, Baybay, Leyte

Oct. 23, 2009

DC MotorDC MotorUsing computer animations Using computer animations

ObjectiveObjective

The paper aims to provide the secondary and tertiary Physics teachers an instructional material in teaching the concepts of DC Motor using geometric animated presentation created in Microsoft Powerpoint software.

No one needs to be reminded of the importance of electric motors in contemporary society.

No one needs to be reminded of the importance of electric motors in contemporary society.

A DC motor is an electric motor that runs on direct current (DC) electricity.

What is a DC motor?What is a DC motor?

Examples of DC Motors

Toy DC motors

The St. LouisDC Motor

The St. LouisDC Motor

How does a DC motor work?How does a DC motor work?

In a motor a magnetic moment acts on a current-carrying conductor, and electric energy is converted to mechanical energy.

+

-

I

Magnetic moment

I = electric current (amp)A = cross section area of conductor

µ = IA

Magnetic wire conductor

CIRCULAR LOOP CONDUCTION

S

+-DC Supply

N Rotor (Magnet wire)

Single Coil DC Motor Apparatus

S

+-DC Supply

N


Rotor (Magnet wire)

N

+-DC Supply

SB

τ

Rotation axis

Rotor (Magnet wire)

I

I

I

I

I

II

Single Coil DC Motor System

+-DC Supply

Permanent magnets

commutatorcommutatorbrush

brush

µ = magnetic moment (A.m2)

B = magnetic field (Tesla)

τ = torque

B

τ

τ

S

N

+-DC Supply

SB

N

I

I

I

I

I

II


+-DC Supply

B

τ

τ

τ

S

N

+-DC Supply

SB

τ

N

I

I

I

I

I

II


+-DC Supply

B

τ

τ

SB

τ

+-DC Supply

N

I

I

I

I

II

I


loopofareaA

IA

SB

τ

+-DC Supply

N

I

I

I

I

II

I


I

II

I

S

0τ0

+-DC Supply

N I=0


B

I

I

I

II

S

+-DC Supply

N


B

I

II

I

I

I

I

I

τ

SB

τ

+-DC Supply

N

I

I

I

I

II

I


Run

+

I

I-

Magnetic field lines

Torque moment

Current

Magnetic wire

Solenoid (Electromagnet)

Iron core

S

+-DC Supply

N

I

I

I

I

Multiple Coil DC Motor Apparatus

IB

τ

+-DC Supply

I

commutator

brush

Magnet wire

S

+-DC Supply

N

I

I

I

I


B

τ

I

S

+-DC Supply

N

I

I

I

I


B

τI

S

+-DC Supply

N

I

I

I

I


B

S

+-DC Supply

N

I

I

I

I


B τ

I

S

+-DC Supply

N

I

I

I

I


B

τ

I

S

+-DC Supply

N

I

I

I

I


BI

τ

S

+-DC Supply

N

I

I

I

I


IB

τ

S

+-DC Supply

N

I

I

I

I


B

τ

I

S

+-DC Supply

N

I

I

I

I


B

τI

S

+-DC Supply

N

I

I

I

I


BI

τ

attract

repel

S

+-DC Supply

N

I

I

I

I


B

Run

Do it yourself!

• 1 pc. Dry cell battery size AA• 1 pc. A battery holder or Tyro

foam• 1 pc. Permanent magnet• 3 feet Magnet wire gauge 20 or

thicker• 1 foot Connecting wire • 1 pc. cutter

• 1 pc. Dry cell battery size AA• 1 pc. A battery holder or Tyro

foam• 1 pc. Permanent magnet• 3 feet Magnet wire gauge 20 or

thicker• 1 foot Connecting wire • 1 pc. cutter

MaterialsMaterials

+_

S

N

B

+_

SN

B