- #1
Yafimski
- 24
- 0
Hello,
I have a setup whereby:
1) A circular plate with fillet under-edge, is sitting like a bowl on some ball bearings. Imagine if you will a bowl sitting in a way that it can rotate and move a bit up and down etc. without much friction.
2) The plate needs to rotate at about 4 or 5 rpm.
3) The plate is 80kg.
4) The radius of the plate is 0.15m
5) A motor in the center spins it.
What I am trying to find out is the strength of a motor needed in order to rotate those 80kg continuously. Right now I am using a NEMA 17 planetary gear motor, which can only move a few kg and is hardly enough for what I need.
I calculated the following:
Angular velocity (w) = 0.166 rad/s
Angular acceleration (a) = 0.55 rad/s2
Linear velocity (at edge) (v) = 0.025 m/s
Rotational Inertia (i) = 0.9 kg*m2
So my questions are:
1) Are my calculations correct so far?
2) Given the formula of torque = i * a, does this mean just to multiply (0.9kg*m2) * (0.55rad/s2)?
In that case, I'm not sure I understand the units here... what is m2*rad/s2??
3) Eventually what I want to know as a result is the strength of the motor, meaning it's torque, in order for me to get a proper motor for this application.Thank you
I have a setup whereby:
1) A circular plate with fillet under-edge, is sitting like a bowl on some ball bearings. Imagine if you will a bowl sitting in a way that it can rotate and move a bit up and down etc. without much friction.
2) The plate needs to rotate at about 4 or 5 rpm.
3) The plate is 80kg.
4) The radius of the plate is 0.15m
5) A motor in the center spins it.
What I am trying to find out is the strength of a motor needed in order to rotate those 80kg continuously. Right now I am using a NEMA 17 planetary gear motor, which can only move a few kg and is hardly enough for what I need.
I calculated the following:
Angular velocity (w) = 0.166 rad/s
Angular acceleration (a) = 0.55 rad/s2
Linear velocity (at edge) (v) = 0.025 m/s
Rotational Inertia (i) = 0.9 kg*m2
So my questions are:
1) Are my calculations correct so far?
2) Given the formula of torque = i * a, does this mean just to multiply (0.9kg*m2) * (0.55rad/s2)?
In that case, I'm not sure I understand the units here... what is m2*rad/s2??
3) Eventually what I want to know as a result is the strength of the motor, meaning it's torque, in order for me to get a proper motor for this application.Thank you