DC Motor Data Accuracy

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1

Hello
This is the first time I make a post here at RobotShop. I have a question. I want to make a Ball-On-Plate balancing system(googoltech.com/uploads/catalog/1326/GPB.jpg). I need two DC motors to rotate the plate in each direction(Each DC motor acts on one direction only).
For this purpose, I need to know data sheet of DC motors. I want to know motor torque constant, moment of inertia of output shaft etc. I also need a motor that has an encoder already. My question is this:

  1. How accurate are data sheet of DC motors especially motor torque constant?

  2. Do you provide users with moment of inertia value in data sheet(I haven’t seen that in your motors)?

  3. Is DC motor a correct choice? What type of motor do you suggest? I saw that most people used servo motor for Ball-On-Plate system. Please remember that my input to the motor is torque.

  4. I have a limited budget, what type of motor can I buy with $150(for each motor)?

  5. I need a board to convert voltage to current. What type of board do you suggest?

Thanks

2

Hi Mehrdad_89541134

  1. The specification sheet from manufacturer are usually accurate but we do not confirm those values ourselves.
  2. What’s available from the manufacturer is supplied to our customers.
  3. Depending on your mechanical assembly, a R/C servo motor could as well be used. Even linear actuators that can allow for high speed movement.
  4. Many many models. Torque - Speed - Type will need to be choose.
  5. What do you mean ? If you want to sense DC current you will need a dedicated module/sensor for that.

Just for you to look at, here is a complete unit:
ACROME myCONTROL Ball Balancing Table Kit

:slight_smile: