Acceleration of mass?

[mikestocks2006]

Aha...I see where I made the errors.

I used this this torque convertor: http://www.gordonengland.co.uk/conversion/torque.htm  (TORQUE UNIT CONVERSION CALCULATOR)
but I should have used this one: http://www.gordonengland.co.uk/conversion/force.htm     (FORCE UNIT CONVERSION CALCULATOR)

Converting a force of 135lbs equals 600.51 Newton.
But I'm not sure whether the force acting on the 39lb weight is torque or force.

Perhaps I should clarify the problem.
I have calculated approx 135 foot pounds (ft-lbs) of stall torque in the motor I'm building.
Is this value to be seen as torque or force acting on the 39lb rotor?

Hi Honk,
Yep, specifying the problem accurately would definitely help.

It now seems that you are talking about a rotational system (motor) and not a simpler linear system.

Equations and principles that describe rotational dynamics are different.
For example, in a rotational system, the mass of the rotating body, in it self is not adequate to provide the answers sought (speed ?angular-, time, number of revs etc).

The mass moment of inertia will be required. (simply put, not only how much mass does the rotor have, but also how is that mass distributed with respect to its rotating axis)

To get a better answer, the start up torque curve will be required for that motor, especially if one is looking for speeds and times closer to the start up, sub second ranges etc. Ofc this is motor dependent. The manufacturer should be able to provide more info.
Stall torque may not be the same as starting toque, since upon start up there are a number of transients involved (eg rise time to max ?steady state magnetic density- electronic controls response time etc)

However; depending on your time frames, some approximations can be made to emulate steady state values, but you?d have to be well within the ?usually? flat portion of the motor?s torque curve etc.

I hope this helps.

[Honk]

Thank you for your patience with me.

I guess I'll have to wait and the see the real outcome ones the motor is built.

/Honk