Data acquisition on torque sensor

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Discussion Overview

The discussion revolves around data acquisition for a torque sensor used in characterizing electric motors. Participants explore the specifications needed for a data acquisition device to effectively capture both analog and digital signals from the sensor, considering the sensor's output capabilities and the requirements of the associated test bench setup.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Homework-related

Main Points Raised

  • One participant inquires about the appropriate specifications for a data acquisition device to capture the analog and digital signals from a torque sensor that outputs +/-5V analog signals and TTL 5V digital signals.
  • Another participant suggests that to capture the full information from the sensor, a sampling rate of at least 10 kHz is necessary, but notes that a lower rate might suffice depending on the application.
  • A participant describes their setup involving a test bench for characterizing electric motors, detailing the components involved and the need for a data acquisition device to interface with LabVIEW for signal acquisition and analysis.
  • One participant emphasizes that to accurately sample the torque sensor, the sampling rate should be at least twice the sensor's measurement rate, proposing a rate of 20 kHz based on the Nyquist theorem.

Areas of Agreement / Disagreement

Participants generally agree that a sampling rate higher than 10 kHz is necessary to capture the sensor's output effectively, with some suggesting a rate of 20 kHz for optimal results. However, there is no consensus on the minimum required sampling rate for all applications, as some believe a lower rate may be acceptable depending on specific use cases.

Contextual Notes

Participants express varying levels of familiarity with electronic systems and signal processing, which may influence their understanding of data acquisition requirements and the implications of sampling rates.

Who May Find This Useful

This discussion may be useful for individuals involved in electrical engineering, data acquisition systems, or those working with torque sensors and motor characterization in experimental setups.

Trainee28
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Hello,

I am a new member. I have some question concerning data acquisition on a torque sensor and I hope someone can help me out.

I have a torque sensor that I use to mesure the torque and speed of a motor. The torque sensor outputs an analog signal of +/-5V (torque) and two digital signals TTL 5V(speed). I need to choose a data acquisition device to acquire the analog and digital signals of this torque sensor but I don't really know the specification to look for when choosing the right device. The torque sensor is able to take 10000 mesure of torque value per second (10kHz). With this information, should I choose a device with a sample rate larger than 10kHz or smaller? Why is that so?
 
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If you want to get the full information of the sensor, you'll need at least 10 kHz. Depending on the application, you might be able to get away with a lower sampling rate. What do you want to do?
 
Actually, I am working on a test bench to characterize electric motor. The test bench is used to find out the values of inductance, resistance, rotor inertia, torque and speed of any three phase brushless motor mounted on the test bench. On the test bench, there is an electromagnetic brake to supply load torque, a torque sensor in the middle and at the other end a brushless motor, three of them aligned together. I have to use labview to control the electric motor and the brake as well, and then acquire the signals from the torque sensor where the data is then to be sorted out to generate graphs (Torque=f(Speed), Current=f(Speed), Current=f(Torque) etc). Since the test bench is incomplete, I have to find a data acquisition device as as interface between the torque sensor and the labview program.

I rather new in the field of electronic and I haven't studied signal processing before that's why all these frequency and data acquisition stuff seems kinda complicated to me. I hope you can help me out in this matter.
 
Trainee28 said:
The torque sensor is able to take 10000 measure of torque value per second (10kHz)

Welcome to the PF.

If you want to get all the information from that sensor, you will need to sample at twice the bandwidth, so 20kHz. You can read why here: http://en.wikipedia.org/wiki/Nyquist_frequency :smile:
 

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