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158 - Superimposed Direct Current Characteristic Analysis of a Reactor
Accounting for the Minor Hysteresis Loop
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Module:ST,FQ |
2011-01-17 |
A high-frequency reactor, used in equipment such as DC-DC converters, has
a high-frequency current accompanying the switching direct current. The
performance of a reactor is evaluated by a stable inductance in a wide
direct current region superimposed with alternating current components.
The initial magnetization curve is typically used for the magnetization
properties of electromagnetic steel sheet in the magnetic field analysis,
but the operating points are on the miner loops of the hysteresis curve
when a high-frequency alternating current component is superimposed on
the direct current component. (Fig. 1) Differences in the superimposed
direct current characteristics become apparent when the minor loops differ
significantly from the initial magnetization curve. In this case, the inductance
needs to be obtained by taking into account the minor loop.
This example presents the use of a magnetic field analysis to obtain the
superimposed direct current characteristics of a high-frequency reactor
accounting for the minor hysteresis loop by using the frozen permeability
condition.
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143 - Inductance Analysis of an Air Core Coil
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Module:ST |
2011-01-17 |
Air core coils that have a smaller inductance than a coil with a core are
used in high-frequency filters and oscillators.The inductance needs to
be investigated thoroughly because any change to the dimensions can affect
the inductance.This example presents the use of a magnetic field analysis
to compare the analyzed inductance of an air core coil with the inductance
that is theorized.
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122 - Inductance Analysis of an IPM Motor -d/q-axis Inductance Obtained
by Actual Measurement-
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Module:DP |
2011-02-28 |
Evaluating the inductance along the d/q-axis is important to analyze the
teeth of a rotor in an IPM motor. The d/q-axis inductance accounting for
the current phase can be obtained using the PM motor inductance tool, but
this inductance cannot be obtained from actual experimentation. However,
the d/q axis inductance at the current phase 0 degrees which can be obtained
from actual experimentation can be calculated by converting the inductance
of one-phase of coil into three phases for each axis.This example presents
the use of a magnetic field analysis to obtain the d/q-axis inductance
by converting the inductance of the phase coils to three phases and two
axes.
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105 - Leakage Inductance of a Transformer UP! |
Module:FQ,TS |
2012-01-25 |
Estimating the size of the inductance for a transformer is vital during the design process. It is advantageous to measure the leakage inductance using a simulation as it is difficult to calculate by hand.
This example presents the use of a magnetic field analysis to obtain the self-inductance and leakage inductance of a transformer when the arrangement of the secondary coil is modified.
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101 - AL-Value Current Characteristic Analysis of a Choke Coil
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Module:ST |
2011-01-17 |
The AL-value indicating the inductance for the number of turns of a coil
is one of the vital parameters when designing a transformer or choke coil.
Analyzing the current characteristics for the AL-value using a simulation
is advantageous because the AL-value is often set by the design specifications
and the AL-value varies with the input current.
This example presents the use of a magnetic field analysis to obtain the
AL-value current characteristics of a choke coil.
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99 - Superimposed Direct Current Characteristic Analysis of a High Current
Reactor
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Module:TR |
2011-01-17 |
High current reactors with a high-frequency have a superimposed current
composed of a high-frequency ripple and direct current.The performance
of a reactor is evaluated by a stable inductance in a wide direct current
region.The gap that is designed to prevent magnetic saturation from the
core largely affects the inductance. The gap is a vital parameter of the
reactor's design.This example analyzes the superimposed direct current
characteristics of a high current reactor with a high frequency.
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81 - AL-value Analysis of a Choke Coil
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Module:ST |
2011-01-31 |
The AL-value is one of the vital parameters when designing choke coils.
Analyzing the air gap versus the AL-value using simulations is advantageous
because the AL-value is often set by the design specifications and it varies
with the width of the air gap.
This example presents the use of a magnetic field analysis to obtain characteristics
of the air gap versus the AL-value for a choke coil.
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77 - Inductance Analysis of an RFID Tag
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Module:FQ |
2011-01-17 |
An RFID tag sends information from a reading device to an IC chip using
electromagnetic induction.The resonance phenomenon of the coil antenna
and capacitor inside an RFID tag is used to accurately transmit information
on specific frequencies.The inductance of the RFID tag needs to be accurately
obtained to produce the correct resonance on the specified frequency by
identifying the capacity of the external capacitor. This example presents
the use of a magnetic field analysis to obtain the magnetic field distribution
and inductance of an RFID tag with a specific frequency of 13.56 MHz.The
example analyzes the iron loss of a reactor.
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70 - Analysis of Impedance-Frequency Characteristics of a Cable
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Module:FQ |
2011-01-17 |
Twisted pair cables are insusceptible to external noise and emit less noise,
so they are used for such as speaker cables and power wires which require
strict noise reduction. When current frequency in the cable increases,
the current flows non-uniformly in the copper wire due to skin effect and
proximity effect, resulting in the increase of resistance and the reduction
of inductance. Losses are proportional to resistance, and the change in
inductance distorts the signal. Therefore, it is important to investigate
both resistance and inductance at different frequencies before designing
the cable. This note presents the use of magnetic field analysis to obtain
resistance and inductance in a cable at different frequencies.
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60 - Superimposed Direct Current Characteristic Analysis of a Reactor
|
Module:TR |
2011-01-17 |
A high-frequency reactor, used in equipment such as DC-DC converters, has
a high-frequency current accompanying the switching direct current.The
performance of a reactor is evaluated by a stable inductance in a wide
direct current region.The gap that is designed to prevent magnetic saturation
from the core largely affects the inductance. The gap is a vital parameter
of the reactor.
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52 - Inductance Analysis of a Sheet Coil Transformer
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Module:FQ |
2011-01-17 |
The geometry of transformers used for power supply circuits, etc., gets
larger as the current flowing through the transformer gets larger. A sheet
coil transformer is a transformer that is made flat by winding the coil
with thin sheets of metal. One vital element required in the design of
transformers is the inductance. The product development stage can be streamlined
by obtaining the inductance in advance through a simulation. This note
presents the use of a magnetic field analysis to obtain the inductance
of a coil sheet transformer.
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17 - Inductance Analysis of an IPM Motor
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Module:DP |
2011-02-28 |
IPM motors can use not only the magnetic torque but the reluctance torque.
It is important to accurately calculate the reluctance torque for evaluating
the motor characteristics such as the optimal advance phase angle. This
case study shows the IPM motor inductance obtained using the JMAG PM Motor
Inductance tool.
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14 - Inductance Analysis of a Busbar |
Module:FQ,Pi |
2006-10-30 |
Voltage surges can damage the components in electrical equipment such as
an inverter. It is important to reduce busbar inductance to protect the
electrical equipment since it can be a cause of surges. This case study
shows the current distribution and frequency versus the inductance characteristic
of the busbar.
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