MG90S Servo.. Ain't No Stoppin' Us Now

Comments

• erco Posts: 20,250

  2019-09-07 22:55

  I just received 6 more from China which operate the same way, so I guess the ones I received are the new normal, for this servo anyway.
  
  That is all.
• Jeff Haas Posts: 418

  2019-09-09 04:47

  There's always a new way to cut a corner!
• kwinn Posts: 8,697

  2019-09-09 14:37

  erco wrote: »

  I just received 6 more from China which operate the same way, so I guess the ones I received are the new normal, for this servo anyway.
  
  That is all.

  
  Could it be that the potentiometer resistive element is a full 360 degrees with the input voltage connections 180 degrees apart? That would allow the wiper to rotate continuously but would make it harder to determine the position of the wiper since both halves of the potentiometer would traverse the same voltage range.
  
  The other explanations that come to mind are multi turn potentiometer, optical/hall encoder, or the potentiometer gear slipping when it reaches the stop. Be interesting to take one apart to find an explanation.
• xanadu Posts: 3,347

  2019-09-12 17:34

  2 minute teardown?
• erco Posts: 20,250

  2019-09-13 00:08

  xanadu wrote: »

  2 minute teardown?

  
  Whenever I get 2 minutes!
• msrobots Posts: 3,704

  2019-09-13 00:26

  wait a moment. Almost there. Here we are.
  
  2 minutes for @erco
  
  Enjoy!
  
  Mike
• robotsRcool Posts: 33

  2019-10-06 23:58

  I have some experience with the LewanSoul LX-16A servos which also have no end stops but in their case, they allow for switching between angular and continuous rotation modes via software. The angle feedback sensor is still a potentiometer though. It is just one which can be rotated through a full 360 degree arc. This particular pot only gives valid readings for about 330 degrees of that rotation. Maybe this servo uses a similar potentiometer.
  
  Photo of potentiometer in LX-16A servo