At 08.47 2011.11.14, you wrote:
>On 14 November 2011 02:07, John Ferrell <jferrell13@triad.rr.com> wrote:
>
>> I also have the RC Airplane obsession. Health issues have kept me
>> grounded for a while.
>>
>
>Sorry to hear that, get well soon!
>
>
>> The analog servos only try to achieve position during the pulse cycle.
>> The digitals are running at max rate regardless of the command pulse rat=
e.
>>
>> If you can drive an analog at the max rate then the power required will
>> likely be the same.
>>
>
>That what I have read in many forums but that does not make sense to me to
>be honest: In my mind if the command comes at every 20ms in an analogue
>servo then I can push the arm a bit further in the non powered period
>simply as I have more time for that, however, then the servo still needs t=
o
>push the arm back to the desired position, right? So in my mind it need to
>work harder to get the position back there fore still needs the same power
>for the same torque -- or at least this is what I did not get :-)

However, you need to remember that the efficiency of the motor is maximum
when it is free to spin at half speed that it would reach without any load.

Any more or less load than this, reduces the efficiency (or so I recall at
least).

The digital motor is always stalled, while the "vibration" of the analog
one, driven with low frequency, allows it to be more efficient, but the
price you pay is that vibration / lack of precision.

>
>Thanks,
>Tamas
>
>
>
>>
>> --
>> John Ferrell W8CCW
>> "The man who complains about the way the
>> ball bounces is likely to be the one who dropped it."
>>
>>
>>
>> --
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>
>
>
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>q=3D"\"",s,q,q,a=3D"\\",q,q,q,a,a,q); }
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