The discussion revolves around calculating the torque required for a rotating sweeper machine broom, focusing on both the initial torque needed to start rotation and the continuous operating torque during use. Participants explore various aspects of torque calculation, including angular momentum, moment of inertia, and the effects of friction and bristle size.
Participants express differing views on the factors affecting torque requirements, including the distinction between startup torque and continuous operating torque. There is no consensus on the exact calculations or the necessary torque values.
Some participants express uncertainty regarding the definitions and calculations of moment of inertia and angular momentum, and there are unresolved questions about the specific conditions affecting torque requirements.
AdityaDev said:To start rotating any object, there has to be an unbalanced torque. Let the torque required be ##\tau##.
What is the change in angular momentum when rod starts rotating with the required RPM starting from rest?
AdityaDev said:Are you familiar with this equation: ##\tau=\Delta I\omega##
AdityaDev said:Assuming its a rod rotating about one end, I=(1/3)ML^2
AdityaDev said:I is the moment of inertia which is analogous to mass in rotational mechanics. M is the mass and L is length of rod.
Than Unit come in N-m2/s ? bcz w unit is rad/s and I N-m2 so bit confuse in thisAdityaDev said:So you can find the torque using the equation in post 4
Ok thank you so much.AdityaDev said:Oops... I am very sorry.
its ##\tau=I\alpha=I\frac{d\omega}{dt}##
I assume that you want to know the torque needed to keep it turning once it has reached speed and is being used. The operating torque will depend on the contact pattern with the swept area, the velocity of travel and the friction between the brush and the swept surface.Tejas Patel said:Can anybody tell me how to calculate torque for rotating sweeper machine broom?
Hello,Baluncore said:I assume that you want to know the torque needed to keep it turning once it has reached speed and is being used. The operating torque will depend on the contact pattern with the swept area, the velocity of travel and the friction between the brush and the swept surface.
The size of the bristles on the brush will have a significant effect. Use the biggest bristles that will do the job.
Review the marketing information from manufacturers of sweeping machines. Make a list of published motor HP and brush RPM. From that you can calculate torque since power is torque multiplied by RPM.
May be this start up torque, So can i need more torque to rotate it constant ?Baluncore said:Broom Dia is - 0.6 m. Weight - 150 Kg.
A quick estimate begins with 150kg * 9.8 = 1470. N
Coefficient of friction is 0.1 so force needed is 1470 * 0.1 = 147N
Diameter is 600mm therefore radius is 300mm = 0.3m.
Torque needed is 147.N * 0.3m = 44.1 Newton.metre
44.1 Nm is an estimate of the continuous operating torque while being used. You may need more torque to start the rotation, but that will only be if you need to accelerate it quickly, or if it is started while it is in contact with a panel.Tejas Patel said:May be this start up torque, So can i need more torque to rotate it constant ?