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Torque and Rotational motion sensor in simscape

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Leonardo Costa
Leonardo Costa on 23 Dec 2020
Commented: Leonardo Costa on 31 Jan 2021
I have an issue in connecting an ideal torque sensor and an ideal rotational sensor to my BLDC motor.
I saw a lot of question and everybody says that the problem is put in parallel this two sensors. But i cannot fully understand the meaning.
Could you please answer with some photo about the differences?
I add a photo of my situation, honestly I cannot see a different way to use this two sensors together.
Thank you in advance

  1 Comment

Hyunuk Ha
Hyunuk Ha on 31 Dec 2020
Simscape is multi-domain plant modeling tool, and each domain has its own variables, which defines power.
In the mechanical rotational domain, two variables are angular velocity and torque.
So, you can detect angular velocity or torque from that domain.
You can refer to the detailed info. at :

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Answers (1)

Juan Sagarduy
Juan Sagarduy on 4 Jan 2021
Hi Leonardo
Torque is a through variable measured with a torque sensor (TS) in series with the shaft of the motor. Speed is an across variable (potential) measured with a rotational sensor (Rot S) in parallel.
In your case, if S is the shaft of the motor, the connection is S - (TS - port R) - (TS - port C) - (Rot S - port R) - mechanical load (inertia, torque source...) (Rot S - port C) connected to a mechanical reference is correct.
Hope this helps out Regards Juan

  1 Comment

Leonardo Costa
Leonardo Costa on 31 Jan 2021
Thank you. I saw the answer only today. The problem of my model is that i don't have any resistant torque. So the motor torque become zero after a transiet.

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