• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 30 subscribers
  • Views 562 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Gyros for BLDC Position control

user6456504
Prodigy 75 points

Hi, I am working on high precision position control with BLDC motors on my master thesis.
I am trying to control the position with an encoder on the TI-C200 processors and It's ok for now. The control accuracy is 0.1 degree on the encoder but for my thesis, I need more precise control. I have decided to do this with high precision gyros but I am a little bit confused about this issue.
I need the control the position at least 200 micro radian accuracy, hence I need to get feedback at least 200 micro radians from the sensor but I am not sure that how can I choose the proper gyro for my application?
In the gyro datasheets, there is nothing about the accuracy values. How can I choose the proper gyro for my application?
Thank you for your help!

  • 0
    TI__Mastermind 21805 points

    Hello, and thanks for your question.

    The actual achieved positional accuracy of the motor will depend on the resolution of the applied PWM waveforms. A higher resolution will result in better positional accuracy . Most motor datasheets will not specify this since it is more dependent on the motor drive system than the motor itself.

    Thanks,

    Matt

  • 0 in reply to Matt Hein
    Prodigy 75 points

    Hi,

    I know that but It's not my problem right now. As you know, I can control the position according to my feedback. I mean If my position feedback is 200 micro radians, It's possible to control the position max. 200 micro radians. My problem is how can I get this feedback from the gyro?

  • 0 in reply to user6456504
    TI__Mastermind 21805 points

    Hi,

    The gyro needs to either have an embedded encoder/resolver, or you need to obtain one separately and mount it to the motor. If the gyro has a sensor embedded, the motor spec should indicate what part is used or what accuracy it has. Additionally the interface from the sensor should be specified from the motor (if the sensor is integrated into the motor) - i.e. QEP, parallel, serial.

    Thanks,

    Matt