[NSRCA-discussion] Servo Signals

[Richard Lewis]

The time between the pulses in the PPM signal from the RX to the servo is measured and turned into digital data that is fed to a microprocessor (comand position).  The analog pot signal is also sampled and turned into digital data that is fed to the microprocessor (feedback position).  The processor does the math required to produce a command to the amplifier that drives the motor to reduce the error between the command position and the feedback position.

Richard




________________________________
From: "Vicente "Vince" Bortone" <vicenterc at comcast.net>
To: General pattern discussion <nsrca-discussion at lists.nsrca.org>
Sent: Tuesday, June 23, 2009 7:03:01 AM
Subject: Re: [NSRCA-discussion] Servo Signals


Jim,
 
I don't know anything about electronics.  I am sure that the following question if very simple for you:  Why the digital servos are called digital?
 
Thanks,
 
Vicente "Vince" Bortone
 

----- Original Message -----
From: "James Oddino" <joddino at socal.rr.com>
To: "General pattern discussion" <nsrca-discussion at lists.nsrca.org>
Sent: Tuesday, June 23, 2009 12:12:23 AM GMT -06:00 US/Canada Central
Subject: Re: [NSRCA-discussion] Servo Signals

What do they say in the Capital 1 commercials, not literally?  Transmitters communicate with receivers digitally in PCM mode and analog in PPM mode.  Receivers communicate with servos analogy (?) with PWM.  The servos are analog.

Jim O



On Jun 20, 2009, at 7:23 PM, Bob Richards wrote:

--- On Sat, 6/20/09, Richard Lewis <humptybump at sbcglobal.net> wrote:




And....Interestingly enough.....It does not matter what kind of fancy whopping digital super latest and greatest TX/RX system you have, the signals to the servos are still firmly rooted in good old 1970's technology....:)  And...Your super whopper digital brushless whatever servo still has an analog pot for position feedback....:)

I for one am eager to see a leap in servo technology.....Bidirectional serial comms to the servos with the servo being able to feed back torque, amps, position, rate, etc.....and encoder/resolver position feedback in the servos to really catch up with the world we live in......

Amen to that. We have digital servos and digital receivers, yet they talk to each other via an analog method and use analog feedback.
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