What hardware do i need to control DC Brush Type motor Speed and Torque?

[kpp]

I am working on a project where i need to run a DC Brush type motor to output desired torque value. As the desired torque value is reached the motor needs to stop. I am trying to find out what hardware and/or software i need to implement this control sytem.

[VGA_CD-ROM]

Hi kpp,
Our NI Motion Hardware page gives a good breakdown of the hardware we offer to run your system. You'd want to get a 734x or 735x motion controller, and if your motor will support similar current limits as the outputs of our drives, the MID-7652 or MID-7654. If the current limits for the motor are outside of the range of our MID drives for servo motors, then you'd need to get a UMI interface and a 3rd-party drive to connect to it.The NI-Motion drivers to work with the motion controller are free and also contain examples for LabVIEW, C/C++, and Visual Basic.

You could also get Motion Assistant software to more easily program and control motion for each motor, but that is entirely optional. You can download a 30-day evaluation version of it to try with our motion controllers, too.

[hrh1818]

On Apr 16, 1:40 pm, kpp <x...@no.email> wrote:
> I am working on a project where i need to run a DC Brush type motor to output desired torque value. As the desired torque value is reached the motor&nbsp;needs to&nbsp;stop. I am trying to find out what hardware and/or software i need to implement this control sytem.
> &nbsp;

How quickly do you need your motor to stop? You can control the
torque by controlling the current applied to the motor. The torque is
directly proportional to the current. But when you remove the power
source applied to the motor the motor will keep coasting If this is
undesirable you will a sophisticated closed loop control system to
control both torque and position.

Howard

[hrh1818]

On Apr 17, 8:40 pm, hrh1818 <hr...@att.net> wrote:
> On Apr 16, 1:40 pm, kpp <x...@no.email> wrote:
>
> > I am working on a project where i need to run a DC Brush type motor to output desired torque value. As the desired torque value is reached the motor&nbsp;needs to&nbsp;stop. I am trying to find out what hardware and/or software i need to implement this control sytem.
> > &nbsp;
>
> How quickly do you need your motor to stop? You can control the
> torque by controlling the current applied to the motor. The torque is
> directly proportional to the current. But when you remove the power
> source applied to the motor the motor will keep coasting If this is
> undesirable you will a sophisticated closed loop control system to
> control both torque and position.
>
> Howard

You may not need a sophisticated closed loop control system after all.
You could use a brake on the output shaft. When you reach the
required torque remove power from your motor and apply power to your
brake to keep the output shaft from rotating.

Howard

[hrh1818]

On Apr 17, 8:40 pm, hrh1818 <hr...@att.net> wrote:
> On Apr 16, 1:40 pm, kpp <x...@no.email> wrote:
>
> > I am working on a project where i need to run a DC Brush type motor to output desired torque value. As the desired torque value is reached the motor&nbsp;needs to&nbsp;stop. I am trying to find out what hardware and/or software i need to implement this control sytem.
> > &nbsp;
>
> How quickly do you need your motor to stop? You can control the
> torque by controlling the current applied to the motor. The torque is
> directly proportional to the current. But when you remove the power
> source applied to the motor the motor will keep coasting If this is
> undesirable you will a sophisticated closed loop control system to
> control both torque and position.
>
> Howard

You may not need a sophisticated control system after all. You could
use a brake on your output shaft. When your motor reaches the required
torque remove power from the motor and apply power to your brake to
keep the output shaft from rotating.

Howard

[kpp]

Thanks, Howard.

I want motor to stop as soon as the required torque is achieved at the shaft. I think the brake idea seems like it might work. I need to try it out.

-Kpp

[kpp]

Also, Thanks for yor help Vijay.