Electromechanical Electromechanical SystemsSystems

MST @ MSU

2006

Jeff Rhoads and Terry BallingerJeff Rhoads and Terry Ballinger

Electromechanical SystemsElectromechanical Systems

Electromechanical Systems have Electromechanical Systems have IntegratedIntegrated Mechanical and Electrical ComponentsMechanical and Electrical Components

Basic ElectricityBasic Electricity

Voltage: Voltage: energy required to move a charge energy required to move a charge from one point to anotherfrom one point to another

Basic ElectricityBasic Electricity Voltage: Voltage: energy required to move a charge from one point to energy required to move a charge from one point to

anotheranother Current: Current: a measure of the amount of charge passing through a a measure of the amount of charge passing through a

substancesubstance

Basic ElectricityBasic Electricity Voltage: Voltage: energy required to move a charge from one point to anotherenergy required to move a charge from one point to another Current: Current: a measure of the amount of charge passing through a substancea measure of the amount of charge passing through a substance Resistance: Resistance: a measure of the resistance to current flowa measure of the resistance to current flow

Basic ElectricityBasic Electricity Voltage: Voltage: energy required to move a charge from one point to anotherenergy required to move a charge from one point to another Current: Current: a measure of the amount of charge passing through a substancea measure of the amount of charge passing through a substance Resistance: Resistance: a measure of the resistance to current flowa measure of the resistance to current flow Ohm’s Law: Ohm’s Law: Voltage = Current x ResistanceVoltage = Current x Resistance

Basic ElectricityBasic Electricity

A Simple Circuit…A Simple Circuit…

Basic ElectricityBasic Electricity

A Simple Circuit…A Simple Circuit…

V

Basic ElectricityBasic Electricity

A Simple Circuit…A Simple Circuit…

V Vload

Basic ElectricityBasic Electricity

A Simple Circuit…A Simple Circuit…

V

I

Basic MagnetismBasic Magnetism

Poles/AttractionPoles/Attraction

Basic ElectromagnetismBasic Electromagnetism

ElectromagnetsElectromagnetsLorentz ForceLorentz Force

Case Study I:Case Study I:SpeakersSpeakers

SpeakersSpeakers

Audible RangeAudible Range

Young Adults Can Typically Young Adults Can Typically

Hear Sounds BetweenHear Sounds Between

20 Hz20 Hz and and 20 kHz20 kHz

Case Study II:Case Study II:Electric MotorElectric Motor

Electric MotorElectric Motor

Electric MotorElectric Motor

GeneratorsGenerators

The Systems Used to Generate Electricity The Systems Used to Generate Electricity (Generators) are (Generators) are Almost Almost Identical to MotorsIdentical to Motors

Today’s ActivityToday’s Activity

Today’s ActivityToday’s Activity

Electric Motor

ObjectiveCreate an electric motor capable of achieving maximum rotational speed.

Design ConsiderationsDesign Considerations Coil DesignCoil Design

GeometryGeometry Number of LoopsNumber of Loops Force vs. InertiaForce vs. Inertia

BalanceBalance Magnet PlacementMagnet Placement Coil PlacementCoil Placement Contact SurfacesContact Surfaces

Measurement ProceduresMeasurement Procedures

What is the best way to determine the rate of rotation?