... HIGHPERFORMANCE DRIVES
E Levi, 2001
56
v
qs
*
v
ds
e
φ
r
j
ω
φ
r
i
i
i
a
b
c
*
v
v
*
*
α
β
s
s
v
qs
'
v
ds
'
-
i
ds
*
qs
i
*
ω
*
-
ω
P+I
-
P+I
P+I
i
ds
*
i
qs
*
ω
r
*
L
s
L
σ
s
qs
i
ds
i
-
+
e
-j ... rotor flux is established in the machine, speed command equal to −40 % of the rated speed is
HIGHPERFORMANCE DRIVES
E Levi, 2001
62
curve expressed as a function of the stator q-axis current ... alternating square wave q-axis current command for the rated d-
axis current and open speed loop.
HIGHPERFORMANCE DRIVES
E Levi, 2001
59
-8
-6
-4
-2
0
2
4
6
8
Current (A)
0 0.005 0.01 0.015
Time...
... frequency is high enough, one carrier wave
may be utilised for all the three phases as is done here.
HIGHPERFORMANCE DRIVES
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5. CURRENT CONTROL TECHNIQUES IN HIGH PERFORMANCE
AC ... method. In the latter case, the need for decoupling circuit application is addressed as well.
HIGHPERFORMANCE DRIVES
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in the complex plane and explain the differences when ... permanent magnet synchronous machine (SPMSM) with surface mounted magnets is to
be used in a highperformance machine tool drive, for operation in the base speed region only. It is fed
from a...
... flux:
()
()
i
L
Li
i
L
Li
r
m
sss
r
m
sss
ααα
βββ
ψ
ψ
=−
=−
1
1
(6.18)
HIGHPERFORMANCE DRIVES
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6.5. PERFORMANCE OF THE ROTOR FLUX BASED MRAC SPEED ESTIMATOR
Performance of the MRAC based speed estimator, ... cable
DC generator
Fig. 6.5 - The experimental rig.
HIGHPERFORMANCE DRIVES
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6. SPEED ESTIMATION FOR SENSORLESS HIGH PERFORMANCE
VECTOR CONTROL
6.1. INTRODUCTION
It has been ... used in low cost drive applications, not requiring high dynamic
performance. Different, more sophisticated techniques are required for highperformance applications in
vector controlled drives....
... which
makes the performance of the patch cord
vital to the quality or error rate of the
application.
The need for speed
Category 6 installations have some special
requirements. The performance of ... special
requirements. The performance of Category 6
is much higher than Category 5 or 5e, espe-
cially for NEXT and Return Loss. For opti-
mum performance plugs and jacks must be
“centered” and well ... nothing.
Fluke Networks DSP-4300 with DSP Patch Cord Test Adapters
Application Note
The Weakest Link in High- Performance
Cabling Systems
A new-found respect
Cabling is normally installed long before
furniture...
...
Section A
4
Worksheet: Analyzing Your Data Center
Design and Layout
The key to maintaining a high- performance data network is the design and
layout of your data center.
In Section A, we’ll examine ... questions.
In general, how satisfied are users with the performance of your data
center?
g
Very satisfied; we receive almost no complaints about performance.
g
Somewhat satisfied; while our users ... are getting smaller
and more powerful. The tendency is to use this reduced footprint to cram more
gear into a smaller space, thus concentrating an incredible amount of heat.
Dealing with this heat...
... Overhead Engines
Table level Lowest Lowest MyISAM, Merge, Memory
Row level HighHigh NDB Cluster
Row level with MVCC Highest Highest InnoDB, Falcon, PBXT,
solidDB
xvi
|
Preface
Conventions Used in ... attribution. An attribution usually includes the
title, author, publisher, and ISBN. For example: HighPerformance MySQL: Optimi-
zation, Backups, Replication, and More, Second Edition, by Baron Schwartz ... of storing and retrieving
data, performance can suffer.
A locking strategy is a compromise between lock overhead and data safety, and that
compromise affects performance. Most commercial database...
... randomly intermated connector performance and
is improved through an automated process.
ã What is the typical performance of un-tuned mated connectors in the field?
Typical performance of non-tuned ... mated pair of connectors.
white paper
High Performance Connectors
ADC works to continuously improve its products and processes with respect to quality and
performance. Specifically, ADC has made ... previous
generation or non-ADC connector. However, performance will be optimized when two ADC improved
connectors are mated together.
ã What happens to performance when an improved tuned ADC connector...
... for the connection of the
latest, highly reliable, highperformance peripheral devices such as RAID disks.
FC offers the advantages of connectivity to newer highperformance RAID stor-
age systems ... provides superior performance. Two points are, however, very
notable. First, the absolute performance for both codes is rather high with one
of them reaching even 6 TFLOP/s. Second, the performance ... Nisshin-cho, Fuchu, Tokyo, Japan,
4
NEC HighPerformance Computing Europe GmbH,
Prinzenallee 11, D-40549 Dăusseldorf, Germany
Abstract In 2003, the HighPerformance Computing Center in Stuttgart...
... system, a highly reliable and flexible utility
that you can plug any new applications into. When it’s designed with this vision in mind, additions
and changes aren’t difficult or disruptive.
Highly ... cross-
connection method.
Direct connect
Interconnect
Section B
Infrastructure Solutions
for High- Performance
Data Networks
A Planning Guide for Network Managers
PLANNING GUIDE
A Planning Guide ... while keeping costs down?
Infrastructure Solutions for
A Planning Guide for Network Managers
High- Performance Data Networks
A Planning Guide for Network Managers
Page 13
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