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servo motor minimum angle

BINU K
Intellectual 935 points

Hai,

     I want to drive a small pwm based servo motor. Here I know the basic things about  the servo motor.

Can I drive this, below 1 degree accuracy. I need around 0.1125 degree positional change

  • 0
    TI__Guru** 114905 points
    Hi Binu,

    Our experts have been contacted and should reply soon.
  • 0
    TI__Prodigy 75 points
    Hi Binu,

    Could you please give us some more details about the motor you have and the application? This will help us understand what the appropriate drive scheme should be. Do you have a manufacturer and a model number for the servo motor?

    Thanks,
    Best Regards,
    Sandun
  • 0 in reply to Sandun Kuruppu
    Intellectual 935 points
    Hai Sandun Kurup,
    Right now I want to test with small RC servo. Example link given below
    electrosome.com/.../
    www.pololu.com/.../rc-servos

    Currently I am driving a 1.8 degree stepper motor with 1/16 th step angle, in my application.
    I want to replace this stepper with low cost servo . If it is success I will design my own servo and also expect full support.
  • 0 in reply to BINU K
    TI__Prodigy 75 points
    Hi Binu,

    In typical servo drives, the pulse width controls the angular position. But the resolution may vary from servo drive to servo drive based on minimum pulse width. You may be able to achieve higher resolution if you developed your own servo drive and geared it down sufficiently. Please consider your holding torque requirements and ADC resolution for the feedback path to make sure you can achieve the resolutions you need.

    Best Regards,
    Sandun
  • 0 in reply to Sandun Kuruppu
    Intellectual 935 points
    Thank You Sandun,
    Here my first priority is step angle, only after the torque and other considerations.
    I have 12 bit ADC resolution.
    My application area is automotive throttle valve control.
  • 0 in reply to BINU K
    TI__Prodigy 75 points
    Hi Binu,

    There are multiple factors involved in the servo motor system. The ADC resolution will enable you to sample the position feedback and reference signal at a higher resolution. Higher PWM resolution will enable you to apply a pulse widths that are small. But for a given motor + gear assembly, there may be a limit to the minimum achievable resolution. This you have to verify with the respective servo motor manufacturer. Alternatively, you could design your own servo system either with a DC motor or a three phase BLDC motor coupled to a position feedback (pot,analog hall sensor or an encoder) that can achieve finer position resolution you need. Hope this helps.

    Best Regards,
    Sandun