design of permanent magnet synchronous machines
Chapter 4 permanent magnet ac machines
Ngày tải lên :
16/02/2014, 18:46
... two-pole, permanent- magnet ac machine, which is also called a permanent- magnet
synchronous machine, is depicted in Figure 4.2-1 . It has three-phase, wye-connected
stator windings and a permanent- magnet ... weakening. Details of current control
strategies for surface and buried magnet machines are provided in Chapter 14 .
REFERENCES
[1] R.H. Park , “ Two-Reaction Theory of Synchronous Machines Generalized ... Electronically Commutated DC Permanent Magnet Machines ,”
IEEE Trans. Magn. , Vol. 17 , November 1981 , pp. 3284 – 3286 .
[3] T.M. Jahns , “Torque Production in Permanent- Magnet Synchronous Motor Drives...
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Design of machinery mechanisms and machines 2nd ed
Ngày tải lên :
08/04/2014, 11:35
... engineering education
and of the text Machine Design: An Integrated Approach. He is a Fellow of the Ameri-
can Society of Mechanical Engineers and a member of the Society of Automotive Engi-
neers. ... Principles of Mechanism in 1841 while a
professor of natural philosophy at the University of Cambridge, England. He attempted
to systematize the task of mechanism synthesis. He counted five ways of obtaining ... the quality of the design. Commercially available programs
such as Working Model* also allow rapid analysis of a proposed mechanical design. The
process then becomes one of qualitative design by...
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DESIGN OF ROTATING ELECTRICAL MACHINES pdf
Ngày tải lên :
07/03/2014, 10:20
... Rotating Machines 200
3.7.1 History and Characteristics of Permanent Magnets 200
3.7.2 Operating Point of a Permanent Magnet Circuit 205
3.7.3 Application of Permanent Magnets in Electrical Machines ... Shift of Damper Bar Slotting from the Symmetry Axis of the Pole 392
7.2.8 V Curve of a Synchronous Machine 394
7.2.9 Excitation Methods of a Synchronous Machine 394
7.2.10 Permanent Magnet Synchronous ... Core Length 171
3.3 Magnetic Voltage of a Tooth and a Salient Pole 173
3.3.1 Magnetic Voltage of a Tooth 173
3.3.2 Magnetic Voltage of a Salient Pole 177
3.4 Magnetic Voltage of Stator and Rotor...
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Expansion of Operating Limits for Permanent Magnet Motor by Current Vector Control
Ngày tải lên :
08/03/2014, 22:01
...
values of the demagnetizing coefficient are about
0.8.
In some
cases, the permanent magnet is demagnetized irreversibly by
the flux-weakening control.
VI.
DEMAGNETIZATION
OF
PERMANENT
MAGNET ...
leakage permeance of ar-
mature,
MORIMOTO
et
al.:
EXPANSION
OF
OPERATING
LIMITS
FOR
PERMANENT
MAGNET
MOTOR
867
To
examine the demagnetization of the permanent magnet due
to the ... rare-earth
permanent magnet where the sign of magnetic field intensity
H
is reversed. With the permanent magnet that has a straight
demagnetization curve, such as a rare-earth permanent mag-...
6
594
1
Báo cáo hóa học: " The Optimal Design of Weighted Order Statistics Filters by Using Support Vector Machines" doc
Ngày tải lên :
22/06/2014, 23:20
... hyperplane.
4. SUPPORT VECTOR MACHINES FOR
DICHOTOMOUS WOS FILTERS
4.1. Linear support vector machines for
dichotomous WOS filters
In the above section, the new approach of designing WOS
filter has reduced ... applications. In this
paper, SVMs are introduced into the design of WOS filters in
ordertoimproveperformance.
WOS filters are special subset of stack filters. Each stack
filter is based on a positive ... marginally im-
proved by using the conventional design approach of stack
filter or neural network. Although the adaptive neural fil-
ter can effectively remove noise of various kinds, including
Gaussian noise...
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Brushless Permanent Magnet Motor Design- P1 pptx
Ngày tải lên :
02/07/2014, 08:20
... covers the analysis and design
of
rotational brushless per-
manent -magnet (PM) motors. Brushless dc, PM synchronous, and PM
step motors are all brushless permanent- magnet motors. These specific ... The optimum number
of
magnet poles is a complex function
of motor geometry and material properties. Thus in many designs,
economics dictates that a small number
of
magnet poles be used. ... that op-
posite magnet poles attract, that like magnet poles repel each other,
and that current flowing in a coil
of
wire makes an electromagnet.
Consider the bar permanent magnet centered...
30
387
0
Brushless Permanent Magnet Motor Design- P2 ppt
Ngày tải lên :
02/07/2014, 08:20
... gaps, and slotted magnetic
structures were developed. The properties
of
ferromagnetic and per-
manent -magnet materials were discussed. A magnetic circuit model
of a permanent magnet was introduced ... drop
off
more quickly as -H
c
is ap-
proached. Operation in the area
of
the knee can cause the magnet to
lose some magnetization irreversibly because the magnet will recoil
along a line
of
... proportional to the size
of
the
hysteresis loop
of
a given material, and therefore by inspection
of
Fig.
Figure 2.15 Typical core loss characteristics of ferromagnetic material.
Magnetic Modeling...
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Brushless Permanent Magnet Motor Design- P3 potx
Ngày tải lên :
02/07/2014, 08:20
... motor magnetic design.
In the process of doing so, many additional design tradeoffs become
apparent. Thus the design equations presented here add yet another
layer of understanding of brushless ... current density, A/m
2
N
ph
Number
of
phases
N
m
Number
of
magnet poles
N
sp
Number
of
slots per phase, N
sp
^ N
m
g
Air gap length, m
lm
Magnet length, m
Rso Outside stator ... skew factor computations.
Chapter
6
Design Equations
The preceding chapters provide a wealth
of
information regarding the
design
of
many aspects
of
brushless PM motors. In this chapter,...
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Brushless Permanent Magnet Motor Design- P6 pdf
Ngày tải lên :
02/07/2014, 08:20
... elegance of (7.3) and (7.8) is due to the pure sinusoidal
content
of
the back
emf
and phase currents. Because
of
this elegance,
a great deal
of
work goes into the design
of
some motors ... illustrate many of
the design tradeoffs inherent in motor design. There is no end to the
exceptions and variations that could be considered. Many companies
have computer-based design programs ... difficult. Simply making the magnet arc narrower works, which
results in the use
of
less magnet material.
To ease the explanation
of
the A connection, the rising edges
of
the
back emfs and...
30
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Brushless Permanent Magnet Motor Design- P7 docx
Ngày tải lên :
02/07/2014, 08:20
... Number
of
turns
N
m
Number
of
magnet poles
N
p
Number
of pole
pairs
N
ph
Number
of
phases
N
s
Number
of
slots
N
Number
of
slots per magnet
pole
N
sp
Number
of
slots ... 141-147.
Hendershot, J. R. (1991), Design of
Brushless Permanent Magnet Motors,
Magna Physics
Corp., Hillboro, OH.
This
text
is
more
of a survey of
motor design, material
properties,
and
... This
set
of notes
is used by the authors in day
long
short courses. The basics
of
magnetic circuit
modeling
are
covered.
A very
good discussion
of permanent magnets
and magnetizing...
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480
0
Brushless Permanent Magnet Motor Design- P4 docx
Ngày tải lên :
02/07/2014, 08:20
...
distribution
of
the shoe depth between d\ and d
2
is not critical, but an
optimum design can be determined with the aid
of finite
element anal-
ysis.
Slotted Stator Design
When a slotted stator design ... topologically. The rotor has an even number
of
magnets.
That is, the number
of
magnet poles facing the air gap N
m
is even, and
the number
of
north-south pole pairs on the rotor is N
p
...
General stator design allows more
flexibility.
The primary constraint
on stator design is that the total number
of
stator slots be some even
integer multiple
of
the number
of
phases, i.e.,...
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genetic algorithm based optimal pwm in high power synchronous machines and regulation of observed modulation error
Ngày tải lên :
27/07/2014, 23:28
...
identification of the current harmonic model of synchronous machine and observation of
modulation error. In this approach, considering the equations of synchronous machine, a
model consisting of input ... capabilities of designing the torque
characteristics to meet the requirements of the driven load, have made them the optimal
choices for a multitude of industries. Economical utilization of these machines ...
considered in modelling of these machines, namely space harmonics of the flux linkage
distribution are neglected, linear magnetic due to operation in linear portion of
magnetization curve prior...
30
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DESIGN OF MACHINERYAN INTRODUCTION TO THE SYNTHESIS AND ANALYSIS OF MECHANISMS AND MACHINES phần 2 potx
Ngày tải lên :
08/08/2014, 12:23
... the quality of the design. Commercially available programs
such as Working Model* also allow rapid analysis of a proposed mechanical design. The
process then becomes one of qualitative design by ... motor. There are a myriad of other examples of fourbar coupler
curves used in machines and mechanisms of all kinds.
One other example of a very different application is that of the automobile suspen-
sion ... of the linkage assembly, and its motion is
along a set of coupler curves. The orientation of the wheel is also of concern in this case,
so this is not strictly a path generation problem. By designing...
93
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DESIGN OF MACHINERYAN INTRODUCTION TO THE SYNTHESIS AND ANALYSIS OF MECHANISMS AND MACHINES phần 3 pot
Ngày tải lên :
08/08/2014, 13:20
... orientation of the link which contains
the point of interest. The coupler curve is made to pass through a set of desired output
points. However, it is common for the timing of the arrival of the coupler ... rotation of the input rocker, link 2, through an as yet unspecified angle
~z.
Note also that the angle of the coupler link 3 at each of the precision positions is
defined by the angles of the position ... the coordinates
of vectors W,
Z,
D, and S, which define not only the lengths of those links but also the
locations of the fixed pivots Oz and
04
in the plane and the lengths oflinks 3 and 1....
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DESIGN OF MACHINERYAN INTRODUCTION TO THE SYNTHESIS AND ANALYSIS OF MECHANISMS AND MACHINES phần 4 pptx
Ngày tải lên :
08/08/2014, 13:20
... moving centrode at
one extreme of its path motion (i.e., at one of the positions ofh,3), then it will have a cusp
in its coupler curve. Figure 6-17b shows a coupler curve of such a point, drawn with
program ... linkage.
All of the coupler curves of points on link
3
will have the same path shapes as in the orig-
inallinkage. We now have, in effect, a "linkless" fourbar linkage, really one composed
of ... example shown in Figure 6-14 is a non-Grashof
fourbar. The lengths of its centrodes are limited by the double-rocker toggle positions.
All instant centers of a linkage will have centrodes. If the...
93
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0
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