 SR motor
| 162 - Drive Simulation of an SR Motor using a Control Simulator and the JMAG-RT System |
Module:DP,RT |
2011-07-12 |
Collaborative design is difficult because the control and motor are designed
independently. Linking a magnetic field analysis and a circuit/control
analysis is necessary to evaluate the precise motor behavior accurately
using simulation to reinforce motor development. A simulation that accounts
for both the nonlinear characteristics of the motor and the drive control
characteristics can be run by linking to a circuit/control simulator using
JMAG.
This example presents the use of a control simulator and the JMAG-RT system
to simulate the drive of an SR motor.
|
| 138 - Vibration Analysis of an SR Motor |
Module:DS,DP |
2011-07-12 |
| SR motors are utilized because they have a simple construction that doesn't
use permanent magnets making them robust yet inexpensive when compared
to other motors.However, the electromagnetic force produced by the saliency
of the stator and rotor cause vibrations and noise.This example presents
the use of a coupled magnetic field and structural analysis to obtain the
electromagnetic force of the SR motor and the resonance of the eigenfrequency
in the stator core. |
| 6 - Analysis of the SR Motor Torque Ripple UP! | Module:DP | 2012-04-10 | With the skyrocketing prices of rare earth magnets, expectations have been rising for SR (switched reluctance) motors because they have a motor format that does not use permanent magnets. SR motors have a simple structure that can achieve solid performance at a low price. However, torque generation depends only upon the saliency between the stator and rotor, so torque variations are extremely large and cause vibration and noise, meaning that the use applications are limited. On the other hand, because of the skyrocketing prices of rare earth metals, the improvement in current control technology, the possibility of optimized designs thanks to magnetic field analysis, and the rising ability to reduce challenges, SR motors are being reexamined.
SR motors operate using the nonlinear region of a magnetic steel sheet, so the inductance displays nonlinear behavior that distorts the excitation current waveform a great deal, making it impossible to carry out advanced projections that are accurate with calculation methods that follow linear formulas. Consequently, it becomes necessary to use the finite element method (FEM), which can handle nonlinear magnetic properties in material and minute geometry as well as transient currents.
This Application Note explains how to carry out a torque analysis that changes the switch conversion timing and evaluate both the torque ripples and average torque in an SR motor.
|
|
