Iron loss analysis / Loss analysis
 |
157 - Analysis of Eddy Currents in an IPM Motor Using the Gap Flux Boundary
|
Module:DP,FQ |
2011-01-17 |
The eddy current loss of magnets cannot be ignored with the increasing
use of highly conductive magnets as well as the need for faster and smaller
motors. One way to decrease the eddy current loss is to use divided magnets.
Ways to reduce the eddy current loss by dividing magnets can be examined
using analyses.
This example presents the use of a magnetic field analysis to obtain the
variations of eddy current loss in magnets by the number of divisions using
the gap flux boundary condition. The analysis results can be obtained more
efficiently reducing the time required for the standard transient response
analysis by using the gap flux condition.
|
 |
146 - Stray Loss Analysis of a Transformer
|
Module:FQ,HT,LS |
2011-07-12 |
In recent years, the demands to increase the capacity of high-voltage transformers
while miniaturizing and reducing the cost are getting stricter. Countermeasures
for overheating in areas of the tank caused by leakage flux are important,
especially for transformers with a large voltage capacity.
This note presents the use of loss and thermal analyses to obtain the losses
of the transformer and tank, and then obtain the temperature distribution
of each part based on the losses.
|
 |
142 - Press Fit Analysis of a Divided Core
|
Module:DS,DP,LS |
2011-02-28 |
Motors used in electric power steering are constructed by using a divided
stator core to miniaturize the motor and generate higher output. The press-fitting
stress needs to be accounted for in the iron loss analysis because the
stress caused by press-fitting is known to increase the iron losses when
magnetic steel sheets are used for a divided stator core that has a frame
with press fitting.This note presents the use of a structural analysis
and magnetic field analysis to obtain the iron loss density of a IPM motor
that has no-load with and without the stress by simulating the stress caused
by the press fit core and frame with the press fit condition.
|
 |
132 - Loss Analysis of a Three-phase Transformer
|
Module:FQ,LS |
2011-01-17 |
Recently, the growing demand for energy conservation and highly efficient
transformers is raising the importance of reducing losses. The iron losses
of the core and the copper losses of the coil cause a raise in temperature
and reduction in the efficiency of a transformer because the energy is
released as heat. Evaluating the ratio and distribution of the iron and
copper losses through simulation becomes advantageous when designing a
transformer.This note presents the use of a magnetic field analysis to
obtain the iron and copper losses of a three-phase transformer.
|
 |
117 - Iron Loss Analysis of a Transformer
|
Module:FQ,LS |
2011-01-17 |
Recently, the growing demand for energy conservation and highly efficient
transformers is raising the importance of reducing the amount of loss.
Iron loss, which is one of the major losses for transformers, consumes
electric power as heat inside magnetic materials, causing the efficiency
of the transformer to decrease, and the temperature to rise.Evaluating
the percentage and distribution of the iron losses through simulation becomes
advantageous when designing a transformer. This example presents the use
of a magnetic field analysis to obtain the iron loss of a transformer.
|
 |
110 - Loss Analysis of a Choke Coil
|
Module:FQ,TS,LS |
2011-02-28 |
A choke coil is an electronic component use to prevent currents that exceed
the predetermined frequency. Measures to evaluate the heat source as well
as the core iron losses that occur within the choke coil and the copper
losses of the coil that decrease efficiency need to be used for this analysis.
The iron loss of the core can be obtained from the copper loss and iron
loss of the coil obtained with a mangetic field analysis in JMAG-Designer.
The example presents the use of a copper and iron loss analysis to obtain
the copper and iron losses of a choke coil.
|
 |
106 - Iron Loss Analysis of a Brush Motor
|
Module:DP,LS |
2011-01-17 |
Recently, the growing demand for energy conservation and highly efficient
motors is raising the importance of reducing losses. Iron loss, which is
one of the major losses for motors, is produced when energy is released
as heat, causing the efficiency to decrease and the temperature of the
motor to rise. It is advantageous to measure the iron losses via simulation
during the design stage of a motor. This example presents the use of a
magnetic field analysis to obtain the iron losses of the stator core and
rotor core of a brush motor.
|
 |
91 - Iron Loss Analysis of an IPM Motor Including the Effects of the Press
Fitting Stress
|
Module:DP,LS,DS |
2011-03-31 |
The laminated structure of a core can be sustained using press-fitting
or shrink fitting. The press-fitting stress needs to be accounted for in
the iron loss analysis because the stress caused by press-fitting is known
to increase the iron losses when a magnetic steel sheet is used for the
core of the motor.This example presents the use of a structural analysis
and magnetic field analysis to obtain the iron loss density of an IPM motor
with and without the stress by simulating the stress caused by the press
fit core and frame with the press fit condition.
|
 |
90 - Iron Loss Analysis of an IPM Motor Considering PWM Carrier Harmonics
|
Module:DP,LS |
2011-01-17 |
For a motor's control circuit, a vector control, such as a PWM control,
is generally used. To obtain more detailed motor characteristics, magnetic
field analysis is necessary in which the carrier harmonics caused by PWM
can be taken into account. In JMAG, there are three ways to input a current
waveform with carrier harmonics caused by PWM; connecting directly to a
circuit/control simulator, using a current waveform obtained from the combination
of JMAG-RT motor model and circuit/control simulator, or using an actual
measurement. This note presents the use of magnetic field analysis to obtain
the iron loss of an IPM motor using a current waveform calculated by a
JMAG-RT motor model and a circuit/control simulator.
|
 |
87 - Iron Loss Analysis of an IPM Motor Including the Effect of Shrink
Fitting
|
Module:DP,LS,DS |
2011-01-17 |
Shrink fitting is a fastening method that uses heat to fasten two metal
parts together. The internal stress produced by the clearance causes the
magnetic properties to weaken and the iron losses to increase.Therefore,
evaluating iron losses that include the stress produced by the clearance
is important during the design stage.This example presents the use of a
magnetic field analysis to obtain the iron loss density of an IPM motor
with and without the stress.
|
 |
78 - Loss Analysis of a Sheet Coil Transformer
|
Module:FQ,LS |
2011-01-17 |
Recently, the growing demand for energy conservation and highly efficient
transformers is raising the importance of reducing the amount of loss.
Iron loss, which is one of the major losses for transformers, consumes
electric power as heat inside magnetic materials, causing the efficiency
of the transformer to decrease, and the temperature to rise. Evaluating
the ratio and distribution of the iron losses through simulation becomes
advantageous when designing a transformer.This note presents the use of
a magnetic field analysis to obtain the iron losses of a transformer.
|
 |
75 - Iron Loss Analysis of a Reactor
|
Module:FQ,LS |
2011-01-17 |
Recently, the growing demand for energy conservation and highly efficient
reactors is raising the importance of reducing the losses from reactors.Iron
loss, which is one of the major losses for reactors, is produced when energy
is released as heat, causing the efficiency to decrease, and the temperature
of the reactor to rise.Evaluating the percentage and distribution of iron
loss through simulation becomes advantageous when designing a reactor.The
example analyzes the iron loss of a reactor.
|
 |
69 - Iron Loss Analysis of an IPM Motor
|
Module:DP,LS |
2011-01-17 |
As demands for energy saving and high efficiency motors have increased, reducing losses in the motor becomes more important. Iron loss, one of the main losses of motors, is the cause of decrease in efficiency and increase in motor's temperature since it generates heat in the magnetic material. Therefore, while designing the motor, evaluating iron loss by a simulation is useful.
This note presents the use of magnetic field analysis to evaluate the iron loss of a stator core and rotor core at the rotation speed of 1800 rpm and the current amplitude of 4.0 A with a sinusoidal current.
|
 |
67 - Analysis of AC Loss in a Superconductor |
Module:TR |
2010-08-30 |
When superconductors are in the superconducting state, in which temperature, magnetic field and current become lower than a critical value, its electrical resistance becomes zero. Although superconducting wire rod requires a cooling system to maintain a low-temperature state, having features such as high current density and extremely low loss, it has a lot of advantages in terms of energy and environment. The electrical resistance in the superconductor becomes zero, when DC is applied, but when AC is applied, loss is caused in a superconductor. In JMAG, the AC loss in a superconductor can be obtained. This note presents the use of magnetic field analysis to obtain the AC loss in a superconductive filament.
|
 |
59 - Iron Loss Analysis of an IPM Motor Accounting for a PWM -Direct Link-
|
Module:DP,LS |
2011-07-12 |
In the control circuit of a motor, a vector control such as a PWM controller
is generally used. Therefore, to obtain more detailed characteristics of
the motor, it is necessary to take into account the effect of carrier harmonic
in the PWM for the magnetic field analysis. There are three methods to
input a current waveform that accounts for the carrier harmonic in the
PWM in JMAG. A direct link can be established with the circuit/control
simulator, the current waveform obtained using the JMAG-RT motor model
and circuit/control simulator can be input, or the actual measurements
of the current can be input.
This example presents an analysis of the iron losses of an IPM motor accounting
for the carrier harmonic by directly linking to a circuit/control simulator.
|
 |
58 - Efficiency Analysis of an IPM Motor
|
Module:DP,LS |
2011-03-31 |
IPM motors use not only magnetic torque produced by a permanent magnet
and the rotating magnetic field but also reluctance torque produced by
the inductance difference between the d-axis and the q-axis. So, they are
highly efficient motor with high torque. The current phase angle β,
at which torque and efficiency are maximized, varies with rotation speed
and torque. So, the current phase angle β needs to be taken into account
for designing high efficient motor. This note presents the use of magnetic
field analysis to obtain the efficiency of an IPM motor at each current
phase with the rotation speed of 1800 rpm and the current amplitude of
4.0 Ampere when the motor is driven by sinusoidal current.
|
 |
31 - Iron Loss Analysis of an SPM Motor Including the Effect of Press-fitting
Stress
|
Module:DS,DP,LS |
2011-03-31 |
The laminated structure of the core can be maintained by press fitting or shrink fitting. When a magnetic steel sheet is used for the core of a motor, the stress caused by press fitting is known to affect the increase of iron loss. So, the press-fitting stress needs to be taken into account in iron loss analysis.
This example presents the use of a structural analysis and magnetic field analysis to obtain the iron loss density of an SPM motor with and without press-fitting stress.
|
 |
29 - Iron Loss Analysis of an SPM Motor with Overhanging Magnet
|
Module:LS,TR |
2011-01-17 |
When a motor has magnet overhang, the flux is generated both in the in-plane
direction and the lamination direction, which then increases the iron loss.
To evaluate the loss increases caused by the overhang, those caused by
the flux in the in-plane direction and those by the flux in the lamination
direction need to be separated. This note presents the use of a no-load
iron loss analysis of an SPM motor with and without overhanging magnet.
|
 |
21 - Iron Loss Analysis of an SPM Motor Including the Effect of Shrink
Fitting
|
Module:DS,DP,LS |
2011-01-17 |
Shrink fitting is a procedure in which heat is used to make a very strong
joint between two pieces of metal such as frame and stator. In this case,
the stator is inserted into the frame by extending the radius of the frame
using heat. The stress caused by shrink fitting is known to affect the
iron loss and magnetic circuit. So, it is important to include the effect
of thermal stress in iron loss analysis and magnetic field analysis. This
note presents the use of structural analysis and magnetic field analysis
to obtain iron loss density of an SPM Motor by taking into account the
stress caused by shrink fitting.
|
|
