If I'm using 1/20th of the torque my servo motor can produce and supposing there's no accidentes where more torque is needed. Do I really need to have enough current to meet the stall current specificaiton ?
Simple answer yes. When starting from zero rpm it will draw full current. That also indicates your power supply is at its limit, this is not a good practice.
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Whats your plan if the servo does stall ?
Lots of little tiny nylon cogs etc inside most servos, so consider it is likely that at some point there will be a failure, and the servo jams\stalls.
- Qualified yes.
- You can place a large reservoir capacitor (try 1000uF) near the motor to see if it does the job.
In a word, yes. The motor supply should meet the stall current plus an additional 20% or so at least.
Ron
When a motor is not running, it is the same as being stalled, so you must have the stall current available so it can move.
Yes you do, otherwise your motor doesn't start moving. But I suspect that you wanted to know if your power supply can be rated below stall current. Maybe. Not a good practice. But in your case if you only need it for a fraction of a second at start, you could try @LarryD :s capacitor trick.
In case you are powering with battery and you are worried about going little bit over max drain current, I would not worry about that.
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