control of AC induction motor through VFD

[shami_jadoon]

 want to control centrifugal pump flow speed that is used in a system for cooling( same like HVAC).  I have the labview example in labview examples (Attached). In this example rotor frequency is controlled and accordingly motor speed is controlled, this ac motor can be connected to pump and its flow speed can be controlled.

i want to use this example for 3000 RPM 3 phase ac induction motor. what should i change in this example for that..please help me.. thanks in advance

[Trevor.H]

Hey,

May I ask if you are using the LabVIEW Control Design and Simulation Module for this?  It additionally appears that the example was designed for use with a 3 phase system.  Would it be suitable to set it to a velocity setpoint of 3000 rpm?

[shami_jadoon]

Yes i am using using the LabVIEW Control Design and Simulation Module for this?

I want to control centrifugal pump flow speed that is used in a system for cooling( same like HVAC). as in below pdf attached of different centrifugal pumps they run on different RPMs, and they using 3 phase induction motor for flow of water and they are run on 3000-4000 rpm range. if this ac motor (that is in example )  connect to centrifugal pump and its rpm is controlled then alternatively flow speed will be controlled and that what i need. 

[MauraW]

Hi Shami_jadoon, 

In order to clarify, have you tried using the example with this system and are seeing errors or is this more of a conceptual question of if you can use the centrifugal pump that you attached the PDF of with the example? If you are seeing errors could you attach screenshots? 

[shami_jadoon]

 Yes this is conceptual question that whether i can use this example for attached centrifugal pump pdf. if yes than how if no than please give me any direction as my PhD  work is stuck due to this thing. thanks for your time...

[Cavarval]

Hello,

It is not clear to me if you intend to simulate the pumps control and responses, or to control actual pumps. Can you please tell us about this?

Something to notice is that the example uses a model for the Motors. Have you started working on the pump models or is this what you need help with?

If you want to integrate hardware (HIL style), you can remove the modules from the code and replace them with actual hardware interaction API. Can you explain to us what your end goal is?

[shami_jadoon]

Dear Sir i just intend to simulate the pumps control and responses, and not actual pump. i attached the data of actual pumps just for info or sort of datasheet, like for example if i want to simulate pump that is using 3 phase induction motor of 3000 rpm than how i can i do that.
actually i want to control water flow in pipe through centrifugal pump that is giving  head of 40 m. so for that i download data from net and i found that these centrifugal pump that are giving 40 m are using 3 phase induction motor of round about 3000 RPM. so it means i need to control induction motor RPM and so will alternatively water flow. i found this example in labVIEW examples but unfortunately i am unable to relate this example to my required 3000 rpm  3 phase induction motor control and for that i need your help Sir Please.

[Cavarval]

Hello,

I reviewed the pdf and it seems there's enough information there for the model development. However, while NI provides tools for model simulation, we do not provide model development assistance. If found, however, the following resource. I think you will find it useful.

http://www.ni.com/tutorial/5855/en/ 

Once you are in the middle of the model development process, we can help you if you get into errors or unexpected behaviors, but unfortunately, simulation theory or implementation themselves are out the NI support scope.

[shami_jadoon]

dear Sir i just need this  area( as shown in below figure highlighted area) information / formula. remaining whole circuit is clear to me and i can do development once this area formula is clear to me.

[Cavarval · Accepted solution]

Hello,

I think the picture below should help.

The conversion code is required because the cosine functions need an input in radians, so the speed is converted to rad/s and integrated to get radians. I think the other comments are self-explanatory, but let me know if you have further questions and I will try to help.

Regards,