how to calculate the required torque for a scissor jack?

Question

i want to install a suitable electric motor to the scissor jack but i do not know how to calculate the torque required to lift the load(example 100kg load).

Answer 1

You could look at two things to size your motor...

Torque and Horsepower

Horsepower will give you the amount of work per unit time (i.e. Lift 100kg load 10 feet in the air in 60 seconds)

A motor would drive/spin/crank the sizzor lift to meet the Horsepower your want (i.e. Lift 100kg load 10 feet in the air in 60 seconds)

So you can use this relationship

Horsepower = (Torque * RPM)/5252

Note: Torque is in ft-pounds

You can now play with HP and motor RPM to determine the torque applied for a given motor..or use torque and RPM ratings on a motor to determine if you get the minimum HP

Answer 2

Torque = Applied Force X Length. Therefore you need to clarify the point at which you need to quantify the torque (so as to deduce the length argument) and multiply that value by 100kg.

Answer 3

You left out some information...

Scissor lifts typically provide a mechanical advantage (from the use of leverage and, for automated lifts, a lead screw). Is there a "crank" that you cant to replace with the electric motor? If so, the pitch of the lead screw is necessary, as well as the mechanical advantage of the lever mechanism.