Thanks I think I get it now, digital are basically more accurate in how they work
compared to analog (just like most anything else).
-----Original Message-----
From: Jason Werner [mailto:[EMAIL PROTECTED]]
Sent: Sat 4/13/2002 8:48 PM
To: [EMAIL PROTECTED]
Cc:
Subject: Re: Digital servos - was: RE: [RCSE] HiTech Servo's
Mark,
There are actualyl more things working than just power output. If this
was just a motor that is on or off, then the torque is related to the power
consumption. But the digital servo has a lot of different advantages.
- There is less "slipping" under load. An analog servo has the "two
steps forward, one back" when under load. The time lag during the "off"
period is large enough to allow the gear train to move back slightly. A
digital servo does not (to the same extent at least).
- The motor is controlled in a more efficient manner. Just like a high
rate speed control, the motor is controlled better, resulting in less loss
during the motor use.
Overall digitals use more power, but not on the same direct perrcentage as
the increased torque would indicate.
Jason Werner
----- Original Message -----
From: "Mark Holm" <[EMAIL PROTECTED]>
To: "Rick Eckel" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Saturday, April 13, 2002 11:26 PM
Subject: Re: Digital servos - was: RE: [RCSE] HiTech Servo's
> Rick,
>
> Thanks for your observation. It is certainly true that you don't get
increased
> holding torque or faster response without more power use, but, in a servo
> system, you don't use power you don't need. Not at least if the system is
well
> designed. The servo amplifier, either digital or analog, discrete logic
or
> micro controller, only responds to off-target servo position. For most
gentle
> flying, the loads on the servos probably don't even approach the maximum
that
> "old fashioned" servos put out. If it did, a lot of us would have had a
lot
> more trouble long ago. You probably only see the extra power draw when
cranking
> tight turns at high speed, yanking big flaps down quickly at high speed or
> similar high load maneuvers. No much of a typical glider's fling time is
in
> those regimes, well ok, maybe those crazy combat guys and pylon racers.
Anyhow,
> a real world observation is worth several books full of theory. Thanks.
>
> Mark Holm
> [EMAIL PROTECTED]
>
>
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