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Best option

Bruno Ramos1
Intellectual 425 points

Hello to everyone!


Someone could tell me the best option (between INSTASpin 280xxF or M) for this problem:

I want to control a high voltage ACI motor. the control will be something like this: start > accelerate > max speed > desaccelerate > stop. For this I would like to know the position of the motor shaft. I don't need a precise position, so I want to know which device it's better for this problem. BTW, I want a sensorless solution, without encoder or resolver (if could be possible,ofc).


Thanks,

Bruno Ramos

  • 0
    TI__Guru** 119680 points

    "For this I would like to know the position of the motor shaft"

    The FAST sensorless observer used in both solutions will give you a relative rotor flux angle that can be used for proper stator field orientation. The rotor has to be moving above a certain motor design dependent frequency, so position control is not possible. If that's what you are asking....the motion sequence you described is achievable with sensorless control assuming you don't need to stop at a specific mechanical rotor position. 

     

    MOTION has a much simpler to tune and higher perforce velocity controller and gives you different acccel / decel rates and trajectory curve types. 

     

    Use a kit with the 69M and you will get to test both FOC and MOTION. 

     

     

  • 0 in reply to ChrisClearman
    Intellectual 425 points

    Hello Chris,


    Thanks for your reply. The motion sequence that I described it's, for example to opener gate. The points that I'm concerned it's the points of opening and closing, so the intermediate points where stars the accel/decel dont need to be precise. My question it's if with 28027F I could do that?!


    Thanks

  • 0 in reply to Bruno Ramos1
    TI__Guru** 119680 points

    gate controls don't require precise rotor position control because the rotor movements get geared down to the linear actuation.  there is usual some other sort of limit sensor/switch that will essentially cause an immediate shutdown / inverter off / pwm Hi/Lo event.

     

    Yes, F28027F with InstaSPIN-FOC is being use for these applications today and is appropriate.

    You will have a timer set for specific accell, constant speed, then decel (in some cases), and your "limit switch fault". 

  • 0 in reply to ChrisClearman
    Intellectual 425 points

    Hello Chris,


    Thanks for your reply. Could you point me for the labs that I should pay attention for my purpose?

    Thanks a lot,

    Bruno Ramos

  • 0 in reply to Bruno Ramos1
    TI__Guru** 119680 points

    I suspect you will not need to use RsOnline (proj_lab07), field weakening (proj_lab09), nor over-modulation (proj_lab10), so I suggest you work up through proj_lab05b and use that as your starting point to add your own system code, etc.