 Induction motor
| 166 - Line Start Simulation of an Induction Machine Using a Control Simulator and the JMAG-RT System |
Module:FQ,LS,RT |
2011-07-12 |
Collaborative design is difficult because the control and motor are designed independently. However, the challenges of a design need to be defined at an beginning of the development process using highly accurate simulations while having collaboration between the motor and control designs to realize the current demands of motors. A simulation that accounts for both the nonlinear characteristics of the motor and the control characteristics of the motor drive can be run by linking to a circuit control simulator using JMAG-RT.
This example presents the use of a line start analysis for an induction machine using a control simulator and the JMAG-RT System.
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| 161 - Line Start Analysis of a Three-phase Induction Machine |
Module:DP |
2011-07-12 |
Line starting that is connected directly to the power supply of an electric machine is the simplest starting method of induction machines. A large current flows at the initial start up for line starting because the impedance at a stationary state is smaller than the impedance at a steady drive state. Understanding the basic characteristics for starting the machine using simulation is advantageous because of the effects to the power supply, the electromagnetic force acting on the coil, and then thermal capacity when starting the induction motor are vital.
This example presents the use of a magnetic field analysis to obtain the starting characteristics, such as the rotation speed variations, by simulating the line starting for an induction machine.
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| 119 - Torque Characteristic Analysis of a Three Phase Wound Rotor Induction
Motor |
Module:DP |
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. |
| 74 - Speed Vs. Torque Analysis of a Single-phase Induction Motor |
Module:DP |
2011-07-12 |
| Induction motors are widely used because they have a simple construction
that offers a motor that are compact, lightweight, affordable, and robust.The
induced current flowing in the cage largely effect the performance of the
motor because the motor rotates with the interaction between the magnetic
field of the stator windings and the induced current that flows through
the cage. Evaluating the relationship between the induced current and performance
of the motor using a magnetic field analysis is advantageous.This example
presents the use of a magnetic field analysis to obtain the current density
distribution and the speed versus torque characteristics of a single-phase
induction motor. |
| 68 - Analysis of a Three Phase Induction Motor for the Speed-Torque Curve |
Module:DP |
2011-07-12 |
| In the induction motor, current is induced in the rotor cage by the rotating
magnetic field of stator coils, causing the rotor to turn. Induction motors
are widely used from industrial machines to home appliances since they
are small, light, affordable, and maintenance-free. Analyzing the current
induced in the rotor bars is important since the induced current essentially
determines the performance of the induction motor. This note presents the
use of magnetic field analysis to obtain the current density distribution
and the speed-torque curve of a three-phase induction motor. |
| 63 - Analysis of Torque Characteristics of a Cage Induction Motor |
Module:FQ |
2011-02-28 |
| Induction motors have been widely used in general industries since they
have simple structure, and are affordable, robust and highly efficient.
When an induction motor rotates at synchronous speed, no torque is produced.
However, when it has a proper slip, the maximum torque can be obtained.
In a cage induction motor, when current flows in the cage, the loss is
caused. So, the duration of rotation needs to be controlled depending on
the amount of heat generation. This note presents the use of magnetic field
analysis to obtain the torque characteristics of a cage induction motor. |
| 56 - Torque Characteristics Analysis of a Self Starting Type Permanent
Magnet Motor |
Module:DP |
2011-02-28 |
| A self starting induction motor that has a rotor and cage operates as an
induction motor when starting and as a synchronous motor when the motor
reaches synchronous speed with the poles of the permanent magnets. Self
starting type permanent magnet motors, often used in industrially or in
household appliances, do not require a starting device while providing
high-efficiency. Analyzing the current induced in the rotor bars is important
because the induced current essentially determines the performance when
the motor operates as an induction motor. For this reason, it is important
to evaluate the current that is induced in the self starting type permanent
magnet motor. This example presents the use of a magnetic field analysis
to obtain the current density distribution and the slip versus torque curve
of a self starting type permanent magnet motor. |
| 39 - Torque Analysis of a Three Phase Induction Motor Accounting for the
Skew |
Module:DP,TR |
2011-02-28 |
| An induction motor can utilize skew easily because the cage is constructed
by metallic casting such as die casting. The harmonic components of the
induction currents that do not contribute to the torque and the torque
variations caused by the effects of the slots can be reduced by applying
skew to the induction motor to form a sinusoidal wave of the magnetic flux
variations that link to the cage. This example presents the use of a magnetic
field analysis to obtain the torque waveform of a three-phase induction
motor with and without a cage that has skew. |
| 38 - Starting Performance Analysis of a Single Phase Induction Motor |
Module:DP |
2011-02-28 |
| Single-phase AC is the most commonly used power supply, and an induction
motor is robust and its cost is low. So the induction motor that is powered
with single-phase AC can be readily usable motor. Unlike three-phase AC,
however, single-phase AC alone cannot generate the rotating magnetic field
and the direction of the rotation cannot be specified either. So it cannot
start the induction motor. For this reason, an auxiliary winding needs
to be placed to help the motor start. This note presents the use of magnetic
field analysis to evaluate the starting performance of the induction motor
with use of the auxiliary winding. |
| 1 - Torque Characteristic Analysis of a Three Phase Induction Motor UP! | Module:DP | 2012-04-10 | An induction motor is a motor in which the rotating magnetic field of the stator coils causes induced current to flow in an auxiliary conductor, exerting force on the rotor in the rotational direction and causing it to spin. Induction motors are widely used in everything from industrial machines to home appliances because they have a simple construction and are small, light, affordable, and maintenance-free.
In an induction motor, the current induced by the auxiliary conductor exerts a large influence on its characteristics. It also causes strong magnetic saturation in the vicinity of the gap, in particular. With Finite Element Analysis (FEA), it is possible to investigate the characteristics that accurately evaluate the features listed above, so preliminary design evaluations are effective.
This Application Note introduces a case example of how to obtain the current density distribution of an auxiliary conductor and its rotation speed versus torque characteristics.
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