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Product Analysis. Lab 3. Product Analysis Objectives. Combine previous lab experiences to better understand the workings of a completed product. Develop an appreciation for horsepower and wattage considerations in product design.

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Product Analysis

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Product Analysis

Lab 3

Winter Quarter


Product Analysis Objectives

  • Combine previous lab experiences to better understand the workings of a completed product.

  • Develop an appreciation for horsepower and wattage considerations in product design.

  • Expand the library of electrical schematic symbols used to designate components.

  • Develop reverse engineering skills.

Winter Quarter


Product Analysis

Contents:

  • Power Conversion and Approximation

  • Schematic Components

  • Motor Discussion

Winter Quarter


Power Conversion

watt [for James Watt], abbr. W, unit of power, or work done per unit time, equal to 1 joule per second. It is used as a measure of electrical and mechanical power. One watt is the amount of power that is delivered to a component of an electric circuit when a current of 1 ampere flows through the component and a voltage of 1 volt exists across it.

Winter Quarter


Power Conversion

horsepower, unit of power in the English system of

units. It is equal to 33,000 foot-pounds per

minute or 550 foot-pounds per second or approximately 746 watts. The term horsepower

originated with James Watt, who determined by

experiment that a horse could do 33,000 foot-pounds of work a minute in drawing coal from

a coal pit.

Winter Quarter


Commonly Used Symbols:

DC Source

AC Source

Motor

Ground

Resistor

Capacitor

Fuse

SPST Switch

N.C. Push Button Switch

N.O. Push Button Switch

Female Connector

Male Connector

Schematic Symbols

Winter Quarter


Breakaway View

Stator Winding

Rotor

Laminated Core

Poles “Shaded”

with Copper Wire

Winter Quarter


Stator Winding

Shading Coils

Rotor

Shading Theory

Winter Quarter


Shading Theory

Winter Quarter


Shading Theory

Winter Quarter


Shading Segments

Winter Quarter


Flux Wave Rotation

Winter Quarter


  • f

  • N

s

rpm =

p

120 x 50

2

rpm = = 3000

Motor Speed

  • Motor theory tells us that the speed of an ac motor is directly proportional to the frequency and inversely proportional to the number of poles as follows:

  • Thus, for a 2-pole motor running at 50 hz:

Winter Quarter


Motor Slip

  • The rotor of an induction motor will not rotate at the theoretical speed due to slip. The equation for slip is:

  • Thus, if the anticipated rpm was 3600 and the actual rpm was 3440:

Winter Quarter


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