Hi guys,

So I want to turn an acutator that weight 74 g with my stepper motor (5v) and easyDriver Motor driver, I want to know how much current need for this, and what equation to use to can know the current needed for certain weight.

 

Depends on all kinds of things that you haven't mentioned. First, what does it mean to "turn" and actuator that weighs 74 g? How does the weight get converted to a load on the motor if you are turning it? How fast is the actuator moving? How fast is it accelerating? What are the specs on the stepper motor?

 

One basic test is to use a pulley etc of known dia and use a simple spring scale with string wound around the pulley and detect what is the break-away torque is (ft-lbs etc), required to move or rotate the load, this will be a starting point for the Torque value required of the motor.
Max.

 

If it is a stepper motor then the current doesn't depend on the load on the motor.

 

??But he will need a motor capable of handling the required Load!
If the current required is needed, it will be the rated plate current of the motor and should not be exceeded.
Max.

 

Hi guys,

So I want to turn an acutator that weight 74 g with my stepper motor (5v) and easyDriver Motor driver, I want to know how much current need for this, and what equation to use to can know the current needed for certain weight.

You should look at the power needed.

75kg in one second one meter high needs 736Watt.
scale this all back to 74Gram and specific actuator variable.
the current needed (loss factor) x watt/volt take 1.2 as loss factor.

that's all

Picbuster

 

There is also graphic motor sizing programs out there such as offered by Kollmorgen etc.
Al.

 

There is no such weight as 74g
You have not said if a gearbox is available.
You have not provided any metrics AT ALL.
Nothing can be determined from the information you have provided.