How can I create a variable resistor for use in SimPowerSystems?
조회 수: 84 (최근 30일)
이전 댓글 표시
MathWorks Support Team
2012년 2월 29일
편집: MathWorks Support Team
2022년 10월 14일
I would like to model a variable resistor for use in SimPowerSystems.
채택된 답변
MathWorks Support Team
2022년 10월 14일
편집: MathWorks Support Team
2022년 10월 14일
Simscape, released in R2007a, contains a block called "Variable Resistor":
If you do not have access to Simscape, the attached model shows an example on how to achieve this. This model should also work in most previous versions. Note that the model contains an algebraic loop, but Simulink is able to resolve it and the simulation runs fine with correct results.
In this example model "ControlledResistor_mod_7b.slx", we are directly modifying the current going through the resistor. In a physical sense, this is exactly what a variable resistor does. It limits the amount of electrons going through it by limiting the current. A singularity at R = 0 should never happen because 0 is not a physical resistor value. It should be variable between A and B wherein A,B > 0.
For modelling in SimPowerSystems, one should think in physical terms rather than in mathematical terms. In this model, the approach of computing the voltage that you want the resistor to hold and forcing the appropriate current (I = U/R) through it with a source is taken since it is the practical method in physical terms as opposed to computing the current and forcing the corresponding voltage.
"ControlledResistor_mod_7b.slx" can be modified to "VoltageControlledResistor.slx" for cases when one needs to model a voltage-controlled variable resistor. You can modify the voltage measured across a resistor ("R_var" in the example) as desired in the function block so the resistance is a function of voltage.
댓글 수: 0
추가 답변 (1개)
Sriram Narayanan
2015년 1월 13일
Please right-click the attachment and select "Save Link As" and then you should be able to save the attachment and open the model in Simulink.
댓글 수: 1
Sriram Narayanan
2015년 1월 13일
The models have been updated to SLX format, so, you should now be able to download the attachments without any issues.
참고 항목
카테고리
Help Center 및 File Exchange에서 Trimming and Linearization에 대해 자세히 알아보기
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!