How to measure Torque and RPM of a DC Engine at the same time in Simulink/Simscape

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Benedikt 2013-7-29

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评论：彬魏 2021-9-20

Hey,

I'm operating a DC Engine, which drives a car. I works fine, but I need to know both Torque and RPM of the engine. Using an "Ideal Rotational Motion Sensor" OR an "Ideal Torque Sensor" the results are fine. But when I'm using both sensors at the same time, only one of them is working (Torque).

Does someone have a hint how so solve my Problem?

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Javier External 2017-10-23

Ex1.PNG

I show you a simplify model. If i just want to control a DC motor and I want to see speed(rpm) and torque (N*m)using the two sensors blocks for torque and rotational sensor, i allways have the same problem. One of the signals is 0. (Matlab 2013a)

彬魏 2021-9-20

The torque on both sides of the gear is measured simultaneously in simscape, and the result of the torque sensor is faulty

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回答（7 个）

Franck Donnadieu 2017-12-27

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Good evening, I reproduced your model by adding a resistance. Try to separate scopes also. The overview of the results depends on the scale which is adapted to the biggest value (it is possible that on this scale the other value is not visible without making a zoom). ;)

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彬魏 2021-9-20

The torque on both sides of the gear is measured simultaneously in simscape, and the result of the torque sensor is faulty

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Cyril CRIER 2020-8-25

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Simple_DCMotorGearBox.slx

Hello all, I have the same issue!

I tried the solution of Franck Donnadieu (put a Rotational Friction Block in "Serie" to the R port of the DC motor block), which give me that:

instead of that (basic DC Motor block coming from the command "ssc_dcmotor"):

But I'm still getting this Error message:

I've inserted a simplified model to the post.

Anybody know the trick?

Thanks

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Franck Donnadieu 2020-8-25

Simple_DCMotorGearBox_ok.slx

You make a mistake with the units in the converter (see the error message). Leave the default "1" in the converter, it adapts the unit to the sensor upstream.

Cyril CRIER 2020-8-25

Really?! what a d**b mistake from my side... I guess I just did a copy/paste.

Thank you very much. This error message disappeared I just have to analyse the outcomes now ;-).

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Vincent Riboulet 2020-12-1

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Hello,

The torque sensor should be put in line, exactly like an intensity sensor in the electrical world.

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Leonardo Costa 2020-12-22

Could you explain it with a photo?

彬魏 2021-9-20

The torque on both sides of the gear is measured simultaneously in simscape, and the result of the torque sensor is faulty

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Dimitrios Tzerakis 2021-2-13

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编辑：Dimitrios Tzerakis 2021-2-13

In my model I used a BLDC, but the ports are essentially the same.

You connect the R port of the BLDC to both the R ports of the rotary and torque sensors.

The C port of the Rotational Motion sensor is to be connected to ground (so that its "parallel" to the motor)

However, as @Vincent Riboulet said, the torque sensor needs to be in series with something. To its C port, you can add an inertia, but I even tried a blank torque source (commented out things) and it worked fine.

I tried @Franck Donnadieu's answer, but the rotational friction kept influencing the output of the torque sensor, so I dont reccommend it. (Idk if its because im using R2020a, but think its worth noting).

I hope you can see the picture of my diagram: