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Servo tester to run motor

Old 03-16-2013, 12:05 PM
  #1  
solentlife
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Default Servo tester to run motor

Some people ask about running motor without need for Tx / Rx ...

I thought on my next test - I'd try and remember to take a photo.

Here yer go - attached.

Tester is the cheapo Dual tester from Hobby King ... think it was about $7 ?
Red Brick 70A ESC with 5V 5A BEC
4S 2700 35C Compact LiPo
4400kv Heli motor
70mm Haoye 6 blade EDF

As you can see - the Tester is just same as a Rx ... it accepts power via servo plug connections as well as the labelled battery slot. The ESC lead is plugged into one of the servo locations and bingo.
One of the main things to remember is to have dial turned all way counter clockwise or the ESC will not arm ...



Nigel
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Old 03-16-2013, 04:47 PM
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tobydogs
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i have an extra 6channel hobby king rx bound to a park zone TX. i used to use the tx with the micro p51 thats long gone...lol. i now have several older balsa models with the hkrx's to try out this spring and see if they are controllable with the micro TX and on low rate.

my question about the servo tester is what happens when you pass the center mark of the dial. my servo tester is also inexpensive and a valuable tool on the bench. would dialin up to the center point be the same as wot? and going beyond that run the motor in reverse. just curious.
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Old 03-16-2013, 06:33 PM
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kyleservicetech
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Originally Posted by stuart View Post
i have an extra 6channel hobby king rx bound to a park zone TX. i used to use the tx with the micro p51 thats long gone...lol. i now have several older balsa models with the hkrx's to try out this spring and see if they are controllable with the micro TX and on low rate.

my question about the servo tester is what happens when you pass the center mark of the dial. my servo tester is also inexpensive and a valuable tool on the bench. would dialin up to the center point be the same as wot? and going beyond that run the motor in reverse. just curious.
The world wide standard on the servo signals is a pulse range from 0.001 second (one millisecond) to 0.002 seconds (two milliseconds).

I'm assuming that servo tester is generating a pulse signal in this range. If the servo pulse generator exceeds the above range, you run the risk of driving the servo past its mechanical limits.

So, the same would apply while connecting this servo driver to an ESC with a built in BEC. (If the ESC does not have the built in BEC, an external DC supply is required to run the servo driver.)

A year or three ago, I put together a little bitty servo/ESC driver that first arms the ESC, then applies 0%, 10%, 20%, and up to 100% power to the motor in 6 second steps. The whole thing consists of an 8 pin MicroChip microcontroller, a resistor, and not much of anything else. Made up a bunch of them, and built them up on those Radio Shack perf boards.
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Old 03-23-2013, 03:34 PM
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Dr Kiwi
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I use a servo tester for running motors on my thrust stand:
Attached Thumbnails Click image for larger version

Name:	Leopard 2830 test stand 640.jpg
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