740-B40: Introduction to Mechanical Design and Manufacturing
Spring Quarter 1998
LABORATORY #4
Springback in Metal Bending
LOCATION:
Room BG10, Manufacturing Processes Laboratory, Ground Floor,
Techno
MAGNETICS
Magnet
attracts ferromagnetic materials. Also attracts or repels other
magnets.
Iron (Fe), nickel (Ni), cobalt (Co) etc are ferromagnetic materials.
Poles of a magnet
North pole tries to ali
POWER SYSTEMS
Power System Representation (Modelling)
It is impossible to draw the complete system on a piece
of paper.
Real systems are very, very large.
The portion of interest is usually drawn.
Sta
INDUCTION MACHINES
Induction Motors
Most widely used motor
Rugged
Cheap
Stator supplied with ac power.
AC voltage is induced in the rotor by transformer action.
Hence the name induction machine.
No se
TRANSFORMERS
EQUIVALENT CIRCUIT PARAMETERS
What is an equivalent circuit?
How to determine?
Open circuit test
Determines: R'c and X'm.
Short circuit test
Determine: Xl1, X'12 and R1 + R'2.
Directly m
DC Machines
CHAPTER 4
Right Hand Rule for generation
Consider
a conductor of length
moves at a constant speed of
in a magnetic field of
m
v m/sec
B Wb/m2
in such a way that
B, v and are all mutually
SYNCHRONOUS MACHINES
APPLICATIONS
Generating power
Most (or all) ac electricity is generated by using synchronous generators.
Constant speed, High Efficiency (~95%) machines
M-G sets
Air compressors
C
TRANSFORMERS
CHAPTER 3
Magnetic flux
Flux linkage
COUPLED CIRCUIT
One circuit (coil) linked by the magnetic field produced by
another circuit (coil) is known as a (magnetically) coupled
circuit.
FARAD
PER UNIT QUANTITIES
Practical units
Electrical
Quantity
MKSA
Unit
Short
Form
Other
Units
Voltage
volt
V
kV
Current
ampere amp, A
mA, kA
Impedance
ohm
m, k, M
Real Power
watt
W
kW, MW, GW
Apparent Powe
POWER SYSTEMS
ALTERNATORS
Steady state analysis
Transients analysis (fault conditions)
Constant emf (Ef) behind Zs or Xs.
Transient voltage (E') behind transient reactance (X') or
Sub-transient voltag
ELECTRIC POWER SYSTEM
Electric
Power
System
ELECTRIC POWER SYSTEM
A formal definition
An electrical power system is a network of interconnected
components designed to convert nonelectrical energy
cont
A description of the
material
Polyimide resin
MSE 623
Mi Lu
1. Introduction
Polyimide resin was first used in routine production as one of the composition
materials in integrated circuits (ICs) in 19
DIRECT CURRENT CIRCUITS
DC CIRCUIT CONCEPTS
Voltage and Current
Ohms law and resistance
Voltage source and current source
Ideal and real sources
Independent and dependent sources
V=IR
Voltage drops
DC