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TMS28035 Torque Control

kuo dowsheng
Intellectual 370 points


dear Sir:

 

Do you have example for "Torque Control"?

I need use TMS28035 to run 3-phase Sensored PMSM Control.

Best Regard

 

  • 0
    Genius 5170 points

    Have you checked the examples provided with Control Suite download? Any vector controlled implementation can be potentially used as torque control system by controlling Iq current. Do you only have torque loop? Am curious to know your application.. if possible please share more information on your system and requirements.

  • 0 in reply to Arefeen
    Intellectual 370 points

    dear sir :

    thank your answer .

    1.  yes I Know the Iq value is use for control Torque but  how  to Calculate the  Speed  of   Torque(Run Continuous and stall) .

         in the example Code  no Formula to understand.  for more Detailed information can't  Paste here . please give me your E-mail  !!

    2.  I have two CCS4 error pictures copy  from screen  that  information  want  send  it  by  E-mail  for  you. 

    Best Regard

     

  • 0 in reply to kuo dowsheng
    Genius 5170 points

    Sorry, was not able to understand what is meant by "...the speed of torque”... If you are concerned about the response time then the torque loop should take care of your response performance. A typical way to implement is to use PID... Your PID will also take care of stall when properly tuned. I am not sure if you are also looking for a speed loop or not ...anyway, please make sure to draw a system diagram to identify all the required functions for your system.

    By the way, your best resource to resolve any CCS or other tool related issue is TI ... please forward your questions to TI hot line.

     

  • 0 in reply to Arefeen
    Intellectual 370 points

    many  thank  for Mr. Arefeen.

    it look like this (Renesas ) but not same Motor  type:

    http://tw.renesas.com/applications/key_technology/motor_control/motor_algorithms/child_folder/bldc.jspwatch  

    The "Sinusoidal Commutation for BDLC Motors  " Shaft Torque  Formula include Shaft Angle and current Value.

    It can  get  Motor Torgue value  at  any  speed simply.

    I  wish  the TI  employee  have  this  papers  to describe  Formula  of  3-phase Sensored PMSM.

    Best Regard

  • 0 in reply to Arefeen
    Intellectual 370 points

    Shaft Torque = Kt [IR Sin(o) + IS Sin(o+120) + IT Sin(o+240)]
    where:
    o is the electrical angle of the shaft,
    Kt is the torque constant of the motor and
    IR, IS and IT are the phase currents.

    If the phase currents are sinusoidal: IR = I0Sino; IS = I0Sin (+120o); IT = I0Sin (+240o)
    this reduces to:

    Shaft Torque = 1.5I0*Kt (a constant independent of the shaft angle)