http://www.feetechrc.com/product/analog ... o-fs5113m/
this is the data sheet of my servo motor i want to calculate the current which the servo will draw
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mohamed yasser
- Posts: 9
- Joined: Sun Feb 11, 2018 12:34 am
Re: How do I calculate servo current draws
That will depend on supply voltage and load.
I'd measure it.
I'd measure it.
Memory in C++ is a leaky abstraction .
Re: How do I calculate servo current draws
Also the peak current while moving will be higher than steady current while still and will depend on how fast you try to move the servo.
You will probably need an oscilloscope of some form to catch the transient current pulse as they will be too short (100s of mS maybe) to see on a meter.
PeterO
You will probably need an oscilloscope of some form to catch the transient current pulse as they will be too short (100s of mS maybe) to see on a meter.
PeterO
Discoverer of the PI2 XENON DEATH FLASH!
Interests: C,Python,PIC,Electronics,Ham Radio (G0DZB),1960s British Computers.
"The primary requirement (as we've always seen in your examples) is that the code is readable. " Dougie Lawson
Interests: C,Python,PIC,Electronics,Ham Radio (G0DZB),1960s British Computers.
"The primary requirement (as we've always seen in your examples) is that the code is readable. " Dougie Lawson
Re: How do I calculate servo current draws
PeterO wrote: ↑Mon Feb 19, 2018 8:34 amAlso the peak current while moving will be higher than steady current while still and will depend on how fast you try to move the servo.
You will probably need an oscilloscope of some form to catch the transient current pulse as they will be too short (100s of mS maybe) to see on a meter.
PeterO
Stall current is usually the max. At speed current reduces due to back emf (put another way, to get the stall current through the windings when the motor is spinning will take a much higher voltage than at stall.)
Re: How do I calculate servo current draws
Yes, but that depends on the type of physical load you are moving. You assumed there is a static load to carry, I assumed there was not, so we're both rightPiGraham wrote: ↑Mon Feb 19, 2018 8:58 amPeterO wrote: ↑Mon Feb 19, 2018 8:34 amAlso the peak current while moving will be higher than steady current while still and will depend on how fast you try to move the servo.
You will probably need an oscilloscope of some form to catch the transient current pulse as they will be too short (100s of mS maybe) to see on a meter.
PeterO
Stall current is usually the max. At speed current reduces due to back emf (put another way, to get the stall current through the windings when the motor is spinning will take a much higher voltage than at stall.)
Oh, hang on, You wrote "Stall current" and I though "Holding current". SO yes "stall current" is going to be the highest (i.e when the servo is trying to move but is physically prevented from doing so). Peak transients can approach stall current when trying to quickly move a load with lots of inertia.
My experience comes from model aircraft where servos moving control surfaces have odd dynamic load characteristics.
PeterO
Discoverer of the PI2 XENON DEATH FLASH!
Interests: C,Python,PIC,Electronics,Ham Radio (G0DZB),1960s British Computers.
"The primary requirement (as we've always seen in your examples) is that the code is readable. " Dougie Lawson
Interests: C,Python,PIC,Electronics,Ham Radio (G0DZB),1960s British Computers.
"The primary requirement (as we've always seen in your examples) is that the code is readable. " Dougie Lawson
Re: How do I calculate servo current draws
Ah yes, you wrote "when still" which in the context of a servo will be a light load maintaining a position rather than accelerating a load.
So to measure a maximum current drive the servo against an end stop (or otherwise fix the shaft and try to move the position) and measure the current. That will be worst case.
So to measure a maximum current drive the servo against an end stop (or otherwise fix the shaft and try to move the position) and measure the current. That will be worst case.