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Mar 15, 2013, 05:08 PM
Sopwith Camel's Cousin
Quote:
Originally Posted by Bare
Interesting indeed.
But isn't one of the unspoken/glossed over (?) downsides of digitals being that they suck current... merely holding position ?
...
They do seem to suck current.
That is a trade-off:
digital: can use a lighter servo, but draws more current
analog: will need a heavier servo, but draws less current

In my case, I will be connecting to a 3 axis gyro system, so any servo will start drawing more curren from all the corrections issued by the gyros. The gyro system vendor recommended an external BEC for the servos, etc. so as not to fry the ESC.

LATER:
I dug up some numbers from my testing (using a Watts-Up meter, connected a 5V BEC via a Silicon diode to drop the voltage a little, and pushing the end of the servo arm against a scale):

HKM-282A analog servo ("2.0g"): ran at ~0.19A peak about when the servo gave way at ~130g (using a slightly longer arm than the 2 digital servos below)
HK5320 digital servo ("1.7g"): ran at ~0.28A peak about when the servo gave way at ~250g
HK5330 digital servo ("1.9g"): runs at 0.25 to 0.30A peak when arm tip is pushed to 400 to 425g (servo still not giving way)

some recent 3 to 4g Walkera digital servos: ran at 0.10 to 0.15A peak when arm tip is pushed to >400g (servo still not giving way)

I stopped at about 400g of pushing because that is almost 1 pound for a servo that will go into a plane with AUW= 6 ounces or less (sorry for all the mixed units).

Anyways, these small digital servos eat up some current, but not that much (looks like < 1A for 3 servos, while I expect more than that for the motor), and not all that much more than my analog. The larger, heavier digital servos have the advantage of using less current to exert the same amount of force that I was using.
Last edited by flying-llama; Mar 15, 2013 at 10:12 PM. Reason: Give some measurements
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Jan 19, 2014, 01:25 PM
Registered User

Is this a 180 degree servo


I'm really unsure about this. I know that most servos are 180 degrees, but often you only get 160 out of them. Can anyone comment on the actually degrees this servo can achieve.

Thanks,
Josh
Jan 19, 2014, 02:34 PM
Vi ne donu ĝin
coriolan's Avatar
Josh
Only specialized retract servos and some sail control servos comes close to 180 degrees movement. The norm is more 30<45 degrees on each side of neutral, it is possible to obtain a bit more by changing resistors in the feed-back loop but difficult with modern servos which have a very tiny board! Most rotary servos also have a mechanical stop to limit the movement.
http://www.sentex.ca/~mec1995/gadget.../servomod.html
http://www.sentex.net/~mec1995/gadge.../servomod.html
Jan 22, 2014, 09:15 PM
Pilot, Co-pilot, Navagator
nemoskull's Avatar
IIRC, the hk5320 got close to 180, but that was at .8ms to 2.3ms
Jan 23, 2014, 06:52 PM
Registered User
nemoskull - Not sure what IIRC is?

Coriolan - I meant the physical stops.
Jan 23, 2014, 08:37 PM
RC Connectors dot com
glenn2626's Avatar
Quote:
Originally Posted by Josh_RWL
nemoskull - Not sure what IIRC is?
Here, let me help:

http://lmgtfy.com/?q=IIRC

Latest blog entry: Lower shipping prices!
May 03, 2014, 07:24 PM
Vi ne donu ĝin
coriolan's Avatar
Well finally joined the HK-5320 family and quite amazed at their physical size and weight! A good match for my FlyDream 1 gr Receivers and I love the small wires too. Still wondering what to build for a quick test
May 03, 2014, 07:50 PM
ancora imparo
jj604's Avatar
They are brilliant with the FlyDream 4 channel or the FrSky 5 channel micro receivers.

You can also do a fairly light fully stabilised system using the 10g Orange 4 channel stabilised DSM2.

http://www.hobbyking.com/hobbyking/s...te_ON_OFF.html

Quote:
Originally Posted by coriolan
Well finally joined the HK-5320 family and quite amazed at their physical size and weight! A good match for my FlyDream 1 gr Receivers and I love the small wires too. Still wondering what to build for a quick test
May 04, 2014, 04:40 AM
Only nerd in the village
I use the servos with a Rx34d receiver from Deltang: http://www.deltang.co.uk/rx34d.htm
It has dual onboard ESCs. Unlike the Orange micro TX I also use, the DT receiver will not brown out when the cell voltage is running low.

I use the DT/5320 combination in my F-22 and Nutball with direct drive 8.5mm motor. The weight is comparable to a PZ brick but I don't have to worry about dust and dirt getting into the servos and using separate components gives me more mounting options.

I got the dealer prices from Ping Zheng and even if I added no profit I would not be able to sell them as cheap as HK do. They must be selling many thousands of them.
May 04, 2014, 05:29 AM
ancora imparo
jj604's Avatar
Good point. I should have noted the 10g Orange stabilised Rx is not a 1S capable receiver. It requires a standard 5v from a BEC ESC.
Quote:
Originally Posted by epilot
. Unlike the Orange micro TX I also use, the DT receiver will not brown out when the cell voltage is running low.
Nov 17, 2016, 05:21 PM
Wannabe B-26 pilot!
Matt Halton's Avatar
What's the max voltage this servo can take? I want to put a regular servo plug on it and use it to pan a micro all in one VTX and camera in a tiny parkflyer, the servo will be for headtracking.

Or will I have to use a resistor, or step down board?

Hope someone knows!

Thankyou.
Nov 17, 2016, 06:02 PM
ancora imparo
jj604's Avatar
This servo is manufactured by Dongguan Ping Zheng Science Technology Co., Ltd.

Here is the spec sheet for it.

http://www.pz-gear.com/en/proshow.php?id=31

Although it is designed as a "Low Voltage" servo and specs are given at 4.2v they specifically say "Operating voltage: 2.5 to 4.8V"

In practice they are pretty robust. A year or two ago someone tested one with extended stall loads on 5V and it survived. I have one which was abused by accident on 5V and the case melted but the servo kept working. They are tough little guys.

John

Quote:
Originally Posted by Matt Halton
What's the max voltage this servo can take? I want to put a regular servo plug on it and use it to pan a micro all in one VTX and camera in a tiny parkflyer, the servo will be for headtracking.

Or will I have to use a resistor, or step down board?

Hope someone knows!

Thankyou.
Nov 17, 2016, 06:29 PM
Vi ne donu ĝin
coriolan's Avatar
Very curious about this servo John,never seen it before!
http://www.pz-gear.com/en/proshow.php?id=30
Nov 17, 2016, 06:49 PM
ancora imparo
jj604's Avatar
Yes you have.

It's the one soldered directly to the PC board many of the small coaxial "toy" helicopters which have an all-in-one control board with two ESCs and a two directional swashplate driven by two of these. The PC board provides the "bottom" of the case. They are also missing the electronics which are incorporated in the main processor.

John

Quote:
Originally Posted by coriolan
Very curious about this servo John,never seen it before!
http://www.pz-gear.com/en/proshow.php?id=30
Nov 17, 2016, 07:06 PM
Vi ne donu ĝin
coriolan's Avatar
Wonder if the same as what WLToys uses for the V-911 board?


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