traction control

[nikview]

i m doing a project based on traction control of cars.i m using stepper motors to realise the tyres of the cars.and using a controller i m controlling the speed of the stepper motors.depending upon the variation in the load on the stepper motor the speed should vary.my question is how can i vary the load on any one of the stepper motor but not all simultaneously and still control and sychronise the speed of tat motor with others?

[Jochen]

Nikview,

this sounds like an interesting application but as I'm not sure if I have understood everything correctly here are some questions:

• Do you use an NI motion control board? Which type? What's the driver version?
  
• What exactly do you mean by load? Is this the torque of the motor?
• Do you control the load or is the load change caused by external events?
• How do you measure the load?
  
• If you vary the speed of your axes independently how do you want them to be synchronized?

Thanks and best regards,

Jochen Klier
National Instruments Germany

[nikview]

no i m not using any of the ni produts as of now.this is just my 8th sem project.my whole idea is basically to dump a code in my contorller and interface the stepper motors to it and vary the load through my program and see the change in the speed of the motor depending upon the load change.the idea is if i vary the load on one of motor the other motors should be able to sychronise and maintain the speed of the whole system.so my question is is it possible to vary the speed of one of them but still maintain the system's speed as whole.?

[nikview]

thank u for the reply.

regards

krupa

[Jochen]

Krupa,

I'm sure that it's possible to control motors in the way as you describe but it's not an easy task and I don't think that it's a good idea to use stepper motors in an application that requires dynamic load and velocity changes. This type of application should be realized with servo motors as they can compensate for load changes which is not possible with steppers.

In general you will have to implement a kind of intelligent electronic gearing with a flexible master/slave architecture. In fact this task would be much easier with a tool like the NI SoftMotion development module and it might be a major development task to do everything from the scratch by your own.

Jochen