Timeline for Tips for keeping a motor in sync?
Current License: CC BY-SA 3.0
11 events
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| Feb 8, 2016 at 19:50 | comment | added | goldilocks♦ | So it would be more like pulse width W for time T, which is a variation on the same theme -- but still probably not very feasible. Thinking about the "reciprocating machine" and "pulling a string" back and forth a regular servo would be the best if you have room for attaching the right size gear wheel... | |
| Feb 8, 2016 at 19:41 | comment | added | joan | @goldilocks It doesn't work on pulses like a stepper - one pulse, one step. The pulse width just says go at this speed, you can send 20 or 60 or whatever of those pulses a second, as long as the pulse is the same width it will rotate at the same speed. | |
| Feb 8, 2016 at 19:35 | comment | added | goldilocks♦ | I have a continuous rotation servo (FS5103R) and it certainly does work on pulses -- looking around this seems to be the norm. 1.5 ms is stopped, +/- that is speed and direction. So, eg., 3 * 1.62 ms then 1.5 ms might rotate it X degrees. Dunno what difference load will make. | |
| Feb 8, 2016 at 19:29 | comment | added | joan | @goldilocks Can't tell from the question what sort of pull/push distance is involved. By the way continuous rotation servos don't work on pulses (as a stepper would). The pulse length instead of determining the angle determines the speed of rotation. You'd have the same problem determining the current position as you would with a DC motor. | |
| Feb 8, 2016 at 19:20 | comment | added | goldilocks♦ | Looking at the reciprocating motion machine from from the OP, you do probably need something with continuous rotation. I'd think you could figure out exactly how many pulses of a certain width will turn it how far -- but then I don't know if it will be possible to control it that precisely with the pi. | |
| Feb 8, 2016 at 19:09 | comment | added | joan | @goldilocks If he does opt for a servo it should be a regular one rather than continuous rotation. A servo will likely be cheaper and more reliable and easier to implement than buying a motor driver board and encoders and such like to get over DC motor positioning problems. | |
| Feb 8, 2016 at 18:59 | comment | added | goldilocks♦ | Because that one is $4 more from the same source? >_< | |
| Feb 8, 2016 at 18:02 | comment | added | joan | @PyRulez My mistake. However in that case why don't you by a servo? | |
| Feb 8, 2016 at 17:37 | comment | added | lwr20 | If you look at the link provided, the text states that it is not a servo. It looks like a servo but with the feedback circuit removed. | |
| Feb 8, 2016 at 17:34 | comment | added | Christopher King | Not a servo, its a motor in a servo body. | |
| Feb 8, 2016 at 17:33 | history | answered | joan | CC BY-SA 3.0 |