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Original question:

2MTR-DYNO: Units of measure for controlling through Simulink

2MTR-DYNO: 2MTR-DYNO

SANKHADIP SAHA
Prodigy 50 points
Part Number: 2MTR-DYNO
Other Parts Discussed in Thread: DRV8305
Hi,
I am using the 2MTR-DYNO kit with the TI F28379D LaunchPad with 2 BOOSTXL-DRV8305 booster packs.
The code that I load on the board is obtained by playing the Simulink model obtained through commands c28379Dpmsmfocdual_cpu1_ert and c28379Dpmsmfocdual_cpu2_ert.
(It performes a Permanent Magnet Synchronous Motor Field-Oriented Control). 
I find the the intial callback file in the model properties of simulink file where I find mcbSetInverterParameters.m and I find that inverted dc voltage is configured as 24VDC but according tomanual of the 2MTR dyno , the voltage should be 60 VDC.
Can anybody help me to clear my doubt?
Thank you,
I hope you can help me
  • 0
    TI__Expert 4200 points

    Hi Sankhadip,

    Are you using Embedded Coder to generate code for C2000 device?

    Can you elaborate on your question? Do you want to know why Simulink model has 24 V dc bus voltage? 

    Best,

    John

  • 0
    Mastermind 9005 points

    Hi Sankhadip,

    60 V is the maximum supported by that motor. But even though motor is supporting 60 V, the DRV8305 supports only up to 45 V as mentioned here.

    In our MathWorks example we are using a 24 V power supply which is good enough to drive the 2 MTR DYNO setup.

    HTH,

    -Brian

  • 0 in reply to John_K
    Prodigy 50 points

     Hi John,

    Thanks  for your reply.

    Yes I am using Embedded Coder to generate code for TI F28377S Launchpad.

    Yes mainly I want to know that why Simulink model has 24 V dc bus voltage though the motor is rated as 60vdc .

    Does that motor satisfy rated torque demand with the  Simulink model  that has 24 V dc bus voltage? 

  • 0 in reply to Brian McKay
    Prodigy 50 points

    Hi Brian,

    First of all, I am thankful that you have replied. I can recognize you as I have seen one of you video in YouTube on 'Raspberry Pi Programming using Simulink'.

    Now regarding my query posted above, I now understand what you have said that due to DRV8305 , motor is run with 24VDC and modelled in Simulink.

    But since the DRV8305 supports max up to 45VDC , then why not the Simulink model is configured with 40-45 vdc. And if it is so, then the motor may satisfy the rated torque demand.

    24VDc is good enough to spin the 2 motors. Is it good enough to satisfy the speed torque characteristic over the whole control range even if in the Field Weakening Region of the motor ?

     

  • 0
    Prodigy 120 points

    Simulink models c28379Dpmsmfocdual_cpu1_ert, c28379Dpmsmfocdual_cpu2_ert use call-back c28377pmsmfoc_data.m. There is no parameter related to inverter voltage for this example. In model properties->Call backs->Init Fcn, you can find the call-back file name.

    Motor Speed-Toque characteristic also depends on the Vdc voltage. You can use +24V for spinning the dyno-setup and meets the torque-speed characteristics corresponds to +24V.

    Simulink example can be used for spinning the motor with voltage more than 24V if hardware supports. Ensure BoostXL-8305 (evaluation board) supports the +45V with TI. (DRV8305 supports +45V). Please remember BoostXL-DRV8305 ADC ref is scaled to 3.3 V whereas TI 28379d Launchpad ADC ref is 3.0 V. Any ADC input more than 3.0 V will be trimmed in TI 28379d Launchpad.

    In Motor Control Blockset, you can find example mcb_pmsm_foc_f28379d_dyno.slx used to spin motors in dyno-setup uses this mcb_SetInverterParameters.m file for setting the inverter voltage for plant simulation.

    Refer the Simulink model mcb_pmsm_fwc_qep_f28379d in Motor Control Blockset demonstrates the field-weakening with +24V.