 IPM motor
| 165 - Efficiency Map for an IPM Motor |
Module:DP,LS,RT |
2012-01-25 |
IPM motors are not only an efficient motor that can use a wide drive range, but also a motor that can use the reluctance torque produced by the salient inductance in addition to the magnet torque produced by the permanent magnets and rotational magnetic field. Creating an efficiency map is advantageous for the motor and control designs because the efficiency varies by the rotation speed and torque. Creating an efficiency map generally requires a vast amount of calculations as well as the process to organize the results. However, an efficiency map can be generated easily using the JMAG-RT Viewer feature.
This example presents the use of the JMAG-RT Viewer to create an efficiency map for an IPM motor.
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| 157 - Analysis of Eddy Currents in an IPM Motor Using the Gap Flux Boundary
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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. |
| 156 - Segregation Analysis of Torque Components for an IPM Motor |
Module:DP |
2011-02-28 |
IPM motors are increasingly used in applications such as air conditioners
and automobiles because they can utilize both reluctance torque and magnet
torque. Generally, equation (1) is used to segregate the magnet torque
and reluctance torque of an IPM motor.
The torque can be segregated by obtaining the inductance from equation
(1). However, the effect of the magnets/current on the magnetic circuit
cannot be visualized. This note presents the use of a magnetic field analysis
to segregate the torque and obtain the magnetic circuit produced by each
type of excitation force. |
| 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. |
| 131 - Stray Capacitance Analysis of a Motor |
Module:EL |
2011-02-28 |
AC motors that drive PWM inverters are widely used in household appliances.Motors
used for PWM inverter power supplies are known to produce shaft voltage
which reduces the reliability and life span of the motors.It is advantageous
to investigate the stray capacitance using an analysis in advance because
the shaft voltage is produced by the stray capacitance of the motor.This
example presents the use of an electric field analysis to obtain the stray
capacitance between the IPM motor's coil and stator core, rotor core and
stator core, and inner and outer rings of the bearing.
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| 122 - Inductance Analysis of an IPM Motor -d/q-axis Inductance Obtained
by Actual Measurement- |
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. |
| 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. |
| 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. |
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.
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| 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. |
| 55 - Magnetization Analysis of an IPM Motor |
Module:DP,ST |
2011-01-17 |
| A magnetized magnet needs a careful handling at the time of assembling
an IPM motor, so it is useful to magnetize the magnet after placing it
in the motor. Generally, it is desirable the entire magnet is magnetized
completely. So, magnetization conditions, such as the amount of current,
need to be considered before magnetization. In JMAG, Magnetizing Tool is
used to obtain magnetization field which can be later used to produce magnetization
distribution. This note presents the use of magnetic field analysis to
obtain magnetization fields at different currents, and also to obtain the
induced voltage and cogging torque of an IPM motor when obtained magnetization
fields are used for magnetization of the magnet. |
| 37 - Vector Control Analysis of an IPM Motor using Control Simulator and
the MAG-RT System |
Module:DP,RT |
2011-01-17 |
| Control design and motor design have been conventionally treated as independent
processes, and there is a need for coordinated design for these systems.
Meanwhile, for designing advanced motors, it is important to obtain more
accurate and detailed motor behavior through simulation. For that purpose,
a linked analysis between magnetic field and the circuit / control is necessary.
By linking JMAG to a circuit / control simulator, both the nonlinear properties
of a motor and the control properties of a motor drive can be taken into
account in the analysis. This note presents the use of the JMAG-RT system
and the circuit / control simulator to perform vector control analysis
of an IPM motor. |
| 23 - Eccentricity Analysis of an IPM Motor UP! | Module:DP | 2012-04-10 | One of the causes behind motor vibration and noise is the eccentricity of the rotor. It is well known that the torque in a motor is generated when the electromagnetic attraction and repulsion are produced by the stator and rotor, but the attraction force between the rotor and stator is not well recognized. This is because generally the rotor and stator are positioned at the center which makes it look as if the attraction is balanced out. Therefore an error occurs in the calculation for the parts that support the shaft or stator and the concentric circle is not supported in which the attraction is not canceled. The radial load is constantly moving which generates friction loss in the bearing when an electromagnetic force is unbalanced causing vibration and sound. Also, the tolerance needs to be calculated to a certain extent in the mechanical process. The tradeoff between the amount of eccentricity and the electromagnetic force needs to be specified in the design.
The error in calculation is not large to the point where parts cannot be constructed, but a very small difference of 1/10mm occurs in the eccentricity amount when constructing. To evaluate the small difference in the geometry, a magnetic field analysis using a finite element method with a level of detail in shape deformation that can respond to the accuracy needs to be calculated.
This note presents how electromagnetic force changes when modifying the eccentricity amount for a rotor.
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| 22 - Analysis of the Eddy Current in the Magnet of an IPM Motor |
Module:TR |
2011-02-28 |
| Along with the increasing use of highly conductive magnets as well as the
increasing needs for small-sized motors that have high-speed performance,
eddy current loss in a magnet is now an important issue. One way to decrease
the eddy current loss is to divide a permanent magnet. This note presents
the use of magnetic field analysis to evaluate the change in the eddy current
loss in the divided magnet by changing the number of magnet divisions. |
| 19 - Analysis of the Centrifugal Force in an IPM motor |
Module:DS |
2011-02-28 |
An IPM motor has a magnet embedded in the rotor, it carries a risk that
the magnet may be displaced or come off the rotor core due to the centrifugal
force. The effects of centrifugal forces on the IPM motor can be analyzed
in JMAG while taking into account the contact between the magnet and the
rotor.
This example presents rotor displacement and stress distribution of an
IPM motor with and without the effects of partial magnet movement. |
| 18 - Thermal Analysis of an IPM Motor |
Module:TR,HT,LS |
2011-02-28 |
| The enhancement in motors' efficiency and performance has increased the
importance of reducing the heat generation. JMAG offers thermal analysis
using the loss distribution obtained from a magnetic field analysis. This
case study shows the temperature and its variation in an entire motor. |
| 17 - Inductance Analysis of an IPM Motor |
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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