Torque Vs Speed curve of the Stepper motor

Hi,

Does torque vs speed curve tell anything about the acceleration and deceleration characteristics of a stepper motor?

Farah

 

[George Herold]

On Wednesday, April 4, 2018 at 12:31:08 PM UTC-4, farahs...@gmail.com wrote:

Hi,

Does torque vs speed curve tell anything about the acceleration and deceleration characteristics of a stepper motor?

Farah

I know little of stepper motors, but if you tell me the torque and
moment of inertia, I can tell you the angular acceleration.
(It's just like F=m*a)

George H.

 

The problem is that we want to replace the old stepper motor with a new stepper motor and we are trying to build an argument that new can replace the old one because their speed vs torque curves are same. Is this the right way to prove?

We do not have any information about the acceleration and deceleration of the old stepper motor.

if we compare the speed vs torque curves and if they turned out to be same then would it be okay to conclude that the acceleration and deceleration of the two motors will be same?

 

[George Herold]

On Wednesday, April 4, 2018 at 2:38:24 PM UTC-4, farahs...@gmail.com wrote:

The problem is that we want to replace the old stepper motor with a new stepper motor and we are trying to build an argument that new can replace the old one because their speed vs torque curves are same. Is this the right way to prove?

We do not have any information about the acceleration and deceleration of the old stepper motor.

if we compare the speed vs torque curves and if they turned out to be same then would it be okay to conclude that the acceleration and deceleration of the two motors will be same?

Right that sounds reasonable, but as I said, I don't know much about
steppers. Do they have the same number of poles? (same number of steps
to make one revolution.) What's it for? Are you buying a few or
hundreds? Maybe someone (more knowledgeable) will step in.

George H.

 

Yes, they have the same number of poles and same number of steps to make one revolution.

Right that sounds reasonable, but as I said, I don't know much about
steppers. Do they have the same number of poles? (same number of steps
to make one revolution.) What's it for? Are you buying a few or
hundreds? Maybe someone (more knowledgeable) will step in.

George H.

 

Hi,
Can anyone give me some suggestion on how to calculate the acceleration and deceleration using torque vs speed curve?

 

[whit3rd]

On Friday, April 6, 2018 at 7:19:11 AM UTC-7, farahs...@gmail.com wrote:

Hi,
Can anyone give me some suggestion on how to calculate the acceleration and deceleration using torque vs speed curve?

Acceleration is proportional to torque. The constant of proportionality depends
on the flywheel-like inertia constants of the moving parts being driven. Friction, too,
is of concern, and makes a counter-torque.

 

[default]

On Wed, 4 Apr 2018 09:31:04 -0700 (PDT), farahshaw1992@gmail.com
wrote:

Hi,

Does torque vs speed curve tell anything about the acceleration and deceleration characteristics of a stepper motor?

Farah

It is a little more complicated than that when dealing with steppers
and drivers for steppers. But there's lots of info on the web.

I'd start by finding the specifications of the one you have then
finding something close, things like step angle (anywhere from 90
degrees per step to 0.72 degrees per step depending on the number of
poles in the motor) shaft size, torque, holding torque, voltage,
current, (step angle, voltage and current should get you close enough,
and of course shaft diameter and length)

AND there's the type of motor - unipolar or bipolar drive.

There's some standardization of case sizes too between different
manufacturers, so you may be looking for one. National Electrical
Manufacturers Association, assigns numbers for standardized physical
dimensions of the motors.

I ain't no expert either, but I've done a little tinkering with them.