HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Feb 16, 2010, 09:37 AM
Registered User
Joined Feb 2010
5 Posts
Help!
How dose ESC work, and how dose it deal with Brushless Motor?!!!

Hi everybody, i'm a new here.
i want some help about ESCs and how it work, specially about THROTTLE signle,
- how dose ESC deal with it ?
- what signles outlet to the Brushless motor?
- how dose Brushless respond to the Throttle (PWM Signle)?
- what are the modes of brushless motor ?brake,...).
- is there a certain width to the throttle pulses (is it just low throttle (1ms), mid ...(1.5ms) and Hight throttle (2ms)).

i want ask if there is anybody try to operate brushless motor via ESC without using Transmitter / receiver? that what i'm trying to do....

please help, and thanks all
MA-HELI is offline Find More Posts by MA-HELI
Reply With Quote
Sign up now
to remove ads between posts
Old Feb 16, 2010, 11:56 AM
Registered User
pilotpete2's Avatar
The Northeast Kingdom, Vermont
Joined Jun 2004
5,145 Posts
A simple servo tester such as this one will allow you to control a brushless motor without a radio system
http://www.horizonhobby.com/Products...?ProdID=AST105
The brake function is usually for allowing a folding prop to fold when the throttle is closed on a glider, this is a programmable feature of most ESC's.
Good luck,
Pete
P.S. There are less expensive servo testers than this one from places like Hobby City, shop around
pilotpete2 is offline Find More Posts by pilotpete2
Reply With Quote
Old Feb 17, 2010, 10:18 AM
Registered User
Joined Feb 2010
5 Posts
thanks pilotpete2,

what i want to do is to operate the brushless motor(align RCM-BL650L) via the ESC(RCE-BL100g) without using Transmitter / receiver:
I know that the receiver support the throttle signle to the ECS, and its vary from 1ms(low throttle) to 2m(high throttle). the ECS is programmable and has tow modes: user mode (low throttle sent for seconds for this mode) , and Setup mode (high throttle), and you can choose what mode you want. lets suppose that we choose the user mode by sending a train of 1ms pulses, then after we enter the user mode: there are about 5 options (brake, electronic timing, Aircraft status, throttle response speed) and every option has also 3 option we can choose by varying throttle (low mid high) .
my problem is how to choose from the 5 option.
MA-HELI is offline Find More Posts by MA-HELI
Reply With Quote
Old Feb 18, 2010, 06:13 PM
Registered User
Joined May 2009
76 Posts
You'd have to read the instructions on your ESC, as how to adjust those settings varies from ESC to ESC. Some have you select the mode by going full stick, some have you select the mode by going half stick. I also recommend you have the motor unplugged when you do this setup, as if you mess it up, drop out of programming without realizing it, and go full throttle, you're in for a hurting.
Maverick3n1 is offline Find More Posts by Maverick3n1
Reply With Quote
Old Feb 19, 2010, 06:12 AM
Registered User
Joined Feb 2010
5 Posts
Maverick3n1, thanks for ur reply.

i finally finish what i was looking for and had it successfuly. i'm glad to share my work here, because it was diffecult to try this thing (control ESC without Tx/RX) and no enough info on that in the internet.
i used Atmega8L to generate a 50 hz (20ms) PWM signal with a variable resistor. i supplied the ESC with a Li-Polymer Battery (7.4 V - 1,9 A).
first, you should keep a train of low throttle pulses(1 ms) for a seconds (may 2 or 3 sec) then start to increase the Pulses width (1ms - 2ms) and the BL motor start move and increase its rpm in a high speed. it was amazing to try that. then to decrease the speed, you reverse the the pulses width from (2m - 1ms) till the motor stop turning.
i think that the power supply isn't enough more to supply the motor, may you should use the recommended battery specification for the ESC.
for any help and codes, i can attach it here.

i'll try after what i did, to programming the ESC in its modes.

Good luck for all.
MA-HELI is offline Find More Posts by MA-HELI
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Help! How dose ESC Work and How dose it deal with Brushless Motor!!!!??? MA-HELI Electric Heli Talk 2 Feb 15, 2010 09:18 PM
Discussion Brushless motor? How to hook up esc? thestapler Micro Ready-to-Fly 2 Feb 11, 2010 06:21 AM
Sold Hacker A20-20L brushless motor with Hacker X-30 brushless ESC mickydee Aircraft - Electric - Power Systems (FS/W) 6 Jan 16, 2010 10:25 AM
Discussion How does a brushless ESC's feedback circuit work? Naxos DIY Electronics 16 Dec 05, 2009 01:35 PM
Sold Axi 5320/28 brushless motor, plus Jeti 90 amp opto ESC, Combo deal with program card. CHAMM128 Aircraft - Electric - Power Systems (FS/W) 2 Aug 15, 2008 08:16 PM