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Old Nov 28, 2007, 06:02 AM
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Do you know the Advantages of Digital Servo?

Do you know the Advantages of Digital Servo?

Higher resolution-less deadband, more accurate positioning
1. Faster control response-increased acceleration

2. Constant torque throughout the servo travel

3. Increased holding power when stationary


The "Analog Servo" has custom Logic chip and timing components
The "Digital Servo" has a microprocessor,FET amplifier.

There are two main categories of servos available, analog and digital. Analog servos have been around for quite some time, servos work by sending pulses of power to the servo motor, similar to the way an ESC powers an electric RC truck. However Digital servos have significant operational advantages over analog servos, but with these advantages also come minor disadvantages, and this fact file will try to explain the positives and negatives of Digital servos in simplified terms.

First of all, a digital servo is the same as a traditional servo. Digital servos have the same motors, gears and cases as analog servos and the greatest difference between them is on the controlling circuit, the Digital Servo has a Quartz crystal controlled microprocessor, FET amplifier, which has a decisive influence on the performance of servos.

Where a digital serve differs, is in the way it processes the incoming receiver information, and in turn controls the initial power to the servomotor. Due to a small microprocessor inside the case, can specifically tailor the pulses being sent to the servo's motor. It can also send a larger number of pulses, which means that the range of motion can be broken down into a much finer pattern. Since more pulses are being sent, the servo is more responsive and contains a significantly less amount of deadband.

In a conventional servo, no power is being sent to the servomotor. When a signal is then received for the servo the move, or pressure is applied to the output arm, the servo responds by sending power/voltage, is pulsed or switched On/Off at a fixed rate ,creating small 'blips' of power. By increasing the length of each pulse/blip of power, a speed controller affect is created, until full power/voltage is applied to the motor, accelerating the servo arm towards its new position.

In turn, as the servo positioning pot tells the servo's electronics it is reaching its required position, the power blips are reduced in length to slow it down, until no power is supplied and the servomotor stops.

The Distinct Advantages of a Digital Servo.
First, it equips with the microprocessor, to receive the incoming signal and apply preset parameters to that signal before sending its pulses of power to the servomotor. This means the length of the power pulse/blip, and therefore the amount of power sent out to activate the motor, can be adjusted by the microprocessors program to match its function requirements and therefore optimize the servo's performance.

The second, is that a digital servo sends pulses to the motor at a significantly higher frequency. This means that, as opposed to the motor receiving 50 pulses/sec., it now receives 300. Although the length of the pulses is reduced in a direct ratio to the higher frequency because the power is being turned on/off to the motor more frequently, the motor has more incentive to turn. This also means that not only does the servomotor respond faster to the commands, but that increases or decreases in power for acceleration 、deceleration are able to be transmitted to the servomotor far more frequently. This gives a digital servo an improved deadband, a faster response, quicker and smoother acceleration/deceleration, and better resolution and holding power.

The Disadvantage of a Digital Servo.
Digital servos are definitely more advanced than their analog counterparts. However there is one disadvantage to digital servos, they use more power. Digital servos will drain a battery quicker than an analog servo would. Also running multiple digital servos is generally a bad idea due to the added current draw that they can pull when operated together. In situations where multiple digital servos are used, such as planes, special wiring and extra batteries are the preferred route.

Digital servos are the future for model control, and anyone who has used them says the difference is so significant that they would never return to analog servos, if there is a digital one available to fit the application.

Therefore, Flyermate Industrial Company designed and produced the Flyermate D55.0 Genuine Digital Servo which is the only solution!



Specification of Flyermate D55.0 Genuine Digital Servo:
-Operating Angle: 180degree
-Gear Material: Copper
-Weight: 55.0g
-Operating speed:
0.15sec/60 degree(4.8v)
0.13sec/60 degree(6.0v)
-Stall torque:
8.8kg/cm(4.8v)
10kg/cm(6.0v)
-Operating Voltage: 4.8v - 6.0v
-Operating Current: 1~3A
-Wire Length: 30.6cm
-Dimension: 41.0mm X 20.5mm X 41.5mm

Contact: www.flyermate.com
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Old Nov 28, 2007, 06:21 AM
EMB Jungle Jet Jockey
Georgetown, IN across the Ohio River from Louisville, KY
Joined Oct 2004
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Yeah, but do you know the advantages of reading the forum rules?
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Old Nov 28, 2007, 07:16 AM
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The Great NorthWest
Joined May 2007
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And a CHEAP DIGITAL servo is no better than a mid-range analog servo which is a much better value!!
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Last edited by xwingnut; Nov 28, 2007 at 08:24 AM.
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Old Nov 28, 2007, 08:10 AM
Ready for some cooler weather
canardman's Avatar
Waco, TX
Joined Jan 2006
116 Posts
Ummm... I'd like to just jump in here and say..


*EDIT* "Someone found my post offensive" I forgot about the PC rules here. Sorry
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Last edited by canardman; Nov 28, 2007 at 10:20 AM. Reason: I wasn't being nice.
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Old Nov 28, 2007, 08:16 AM
WHOHH..You See That??
qualcity's Avatar
Aurora, Colorado
Joined Jan 2005
1,761 Posts
OMG canardman...

That was just toooooo darn funny. Had me laughing out of my chair!!! Hahahahaha..
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Old Nov 28, 2007, 10:46 AM
Doug McLaren
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Austin, TX
Joined Jan 2004
261 Posts
Quote:
Originally Posted by szewang2805
... and anyone who has used them says the difference is so significant that they would never return to analog servos, if there is a digital one available to fit the application.
Hardly. They're nice, sure, but I'm not going out and replacing all my analog servos. I'm not even buying only digital servos -- I'm still buying both sorts of servos based on my needs, and often analog still wins -- usually because it's a lot cheaper.

Quote:
Therefore, Flyermate Industrial Company designed and produced the Flyermate D55.0 Genuine Digital Servo which is the only solution!
Well, the only solution ... if you ignore all the other solutions.

Nice ad, by the way. Too bad you put it in a place not meant for ads.
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Old Nov 28, 2007, 11:35 AM
EMB Jungle Jet Jockey
Georgetown, IN across the Ohio River from Louisville, KY
Joined Oct 2004
139 Posts
Quote:
Originally Posted by canardman
Ummm... I'd like to just jump in here and say..


*EDIT* "Someone found my post offensive" I forgot about the PC rules here. Sorry

Boooooooooo!
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Old Nov 28, 2007, 12:22 PM
dessertracer's Avatar
Joined May 2006
849 Posts
So what's being sold?
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Old Nov 28, 2007, 02:21 PM
EMB Jungle Jet Jockey
Georgetown, IN across the Ohio River from Louisville, KY
Joined Oct 2004
139 Posts
Quote:
Originally Posted by dessertracer
So what's being sold?
A bunch of lies.

And some crappy servos.
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Old Nov 28, 2007, 02:43 PM
1 paycheck away from homeless
ghostmechanic's Avatar
United States, KS
Joined Mar 2006
4,574 Posts
-Gear Material: Copper

I found this part hilarious.

Go away spammer!
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Old Nov 28, 2007, 04:12 PM
One cell short of a Pack
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Good ole Smithsburg, MD
Joined Mar 2007
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21 Post this user has and they are ALL AD Spam. Why hasn't he/she been booted yet?
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Last edited by steve1814; Nov 28, 2007 at 04:13 PM. Reason: spelling
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