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DRV8303: Stopping the motor with InstaSpin lab 5b

Hiroyasu Matsubara
Expert 1405 points
Part Number: DRV8303

Hello,
I would like to ask about Instaspin lab 5b.

I'm using lab 5b on our custom board.
When stopping the motor by setting "Refspeed_krpm" to zero,
the motor almost stop normally,
but sometimes the motor drives slightly (for example, 4Rpm).
We would like to stop the motor intently.
What the point to accomplish it , for example,
manage PI gain,or change some constant value ?

  • 0
    TI__Mastermind 23045 points

    Hello Hiroyasu-san,

    Thank you for posting to the MD forum. The team will review your question and submit a response tomorrow. Thank you for your patience!

    Best,

    Isaac

  • +1 in reply to Isaac Lara
    TI__Mastermind 23045 points

    Hello Hiroyu-san,

    I believe that with the current algorithm, when you enter the Refspeed_krpm value to zero the motor is just coasting to a stop hence why you will sometimes see the speed slowly ramp down.

    I am not too familiar with the code in the InstaSpin Lab 5b, but sometimes in these algorithms there can be a ramp down function similar to the ramp up constant and set it to a value to ramp up down faster. If this not an option or does not have good performance  you may be able to implement and active break  by enabling all the low side FETs and not driving the high side FETs.

    Best,

    Isaac

  • 0 in reply to Isaac Lara
    Expert 1405 points

    Hello Isaac Lara,

    Thank you for your reply.

    I'll try to these methods.

    Hiroyasu