 Notice. New forum software under development. It's going to miss a few functions and look a bit ugly for a while, but I'm working on it full time now as the old forum was too unstable. Couple days, all good. If you notice any issues, please contact me. |
Forum Index : Microcontroller and PC projects : (OT) Mega Servo idea’s
| Author | Message | ||||
marcwolf Senior Member  Joined: 08/06/2009 Location: AustraliaPosts: 119 |
HI Folks I'm looking for some feedback here. Sometime it's good to have a lot of servo power, or to use another motor system. For instance - one can adapt a car window winder or wiper motor to be a servo motor. The good thing about these units is that they have a worm drive on the motor so when the motor is powered down it will stay in the last position. Oatley Electronic used to sell a Jumbo Servo board but that is no longer available so what is next. There is a range of cheap larger servo's on EBay (MG 995) and if you buy one of these and take it apart the electronics are fairly simple. Generally there are 3 main chips.. The controller and then 2 MOSFET driver chips. Some I have found to be 4606's but whatever the numbers they equate to a H-Bridge. All one needs to do not is to ID the input's to the H-Bridge, tap them, and then feed them into you own more powerful H-Bridge. As an advantage you can use the rest of the servo as the feedback. Just for idea's Coding Coding Coding.. Keep those keyboards coding.. RAW CODE!!!!! |
||||
| viscomjim Guru  Joined: 08/01/2014 Location: United StatesPosts: 925 |
Hi marcwolf, I have played quite a bit with "high powered" rc servos and the micromite would be really great to mess with this. I have used a controller from pololu that accepts rc input and can drive some monster motors with using a potentiometer for feedback. I have actually used a brushed dc gear motor with a 10 turn pot attached to the output shaft of the gearmotor for feedback. The driver I used had a resolution of 4096 individual steps over the rc time swing, so getting 10 revolutions divided by 4096 steps was a pretty good deal, a little over 400 steps per rev. It is tunable so I got really excellent response from this little beast. You can drive some pretty big motors accurately using the micromite this way. Here is a link for the driver, this one will drive 3 amps continuous and 5 amps peak, but they make the same one that will drive 12 amps with 30 amp peak (bad ass). rc servo driver Let us know what you think. Jim |
||||
| marcwolf Senior Member Joined: 08/06/2009 Location: AustraliaPosts: 119 |
Hi Jim. Thanks for the info and update. I have found these on EBay Motor Controller And they are cheap yet will handle almost any motor for hobbyist purpose. You will still need to do the feedback etc with them However you can use a hacked servo for this :) I have previous made tiny winches with 10turn pots and mini servos and they worked well. With most of the cheaper servo's I buy I also put in 2 x 1.5k resisters - one of each leg of the existing pot and I often get almost 180 degrees out of a servo then :). Dave Coding Coding Coding.. Keep those keyboards coding.. RAW CODE!!!!! |
||||
 Print this page |
