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Instaspin non-regenerative braking

Jason Jones51
Prodigy 140 points

Greetings -

I have an IPM/PMSM running on InstaSpin (24V 6A) and would like to brake the motor in a non-regenerative - but controlled - manner.  I have struggled with this on 6-step drives as well.  As I understand it, we can 'plug' or apply a reverse polarity to the motor and it will brake without regenerating voltage.  I was hoping that there would be an easy way to change the software so that (I'm not sure if I'm saying this correctly) when Iq goes negative, then the phase angle is changed in such a way as to brake without regeneration.  I don't have a handle on all of the vocabulary, so please feel free to correct where deficient.

Thanks,

j

  • 0
    TI__Guru** 119380 points
    you have to do something with the power during that braking.
    one thing you can do is to pump in Id current to dissipate energy into the motor itself.

    you could add a control loop to monitor the Vbus and as you slowly change the torque reference you change Id to try to keep the voltage steady. These changes would all have to be done very slowly though.

    for safety reasons most applications with large regen capability will have a brake resistor circuit to quickly dissipate the power especially in case of a fault.


    unfortunately this is quite an advanced topic and we leave it to the experienced engineer to implement. we do not support with any examples.
  • 0 in reply to ChrisClearman
    Prodigy 140 points
    Thank you. I was beginning to suspect that I would need to go to a brake resistor. Perfect answer :)