I am working to create a device (Arduino controlled :D ) for an academic experiment.
There is a stepper motor that is connected to a shaft with rolling bearing. The objective of Arduino is double: on one case, imposing a rotation and its rotation speed, I would like to measure and save the required torque; on the other case, I would like to impose a torque and measure the speed and the rotation.
From an initial design, the maximum force applied to the bearing is 180 Newtons and, considering a 14x4 mm rod and a system efficiency of 30%, the minimum required torque is about 0.4 Nm.
I did some research, and I thought about using this kind of setup: - Arduino UNO - Motor: http://www.conrad.com/ce/en/product/197969/Trinamic-QSH6018-65-28-210-60-x-60mm-Stepper-Motor-18-Degree-210Nm-0-84Vdc-28A?ref=searchDetail - Driver: https://www.pololu.com/product/2133 The driver would give a very good microstepping, which is required for the experimental results. The wiring scheme would be similar to this: https://a.pololu-files.com/picture/0J4232.600.png?f2f6269e0a80c41f0a5147915106aa55
Here there are my doubts: - Is the project feasible? - Measuring the outgoing voltage change (before it goes to the ground) is enough to measure the torque? And do I need to amplify the signal? - Which power supply would you suggest for the motor? At maximum speed it would consume 2 W of power (ideally, not considering the losses!)
Thank you very much!!