Notices
Brushed/Brushless motors, speed controls, gear drives Discuss all aspects of brushless motors, brushed motors, speed controls (ESC's), gear drives and propellers in this forum.

3 wires?

Old 08-23-2005, 03:34 PM
  #1  
sparkling_fist
Senior Member
Thread Starter
 
Join Date: Jul 2005
Location: London, UNITED KINGDOM
Posts: 453
Likes: 0
Received 0 Likes on 0 Posts
Default 3 wires?

er quick question..
why are there 3 wires in brushless motors?
and cant you put 2 of the wires on to a normal AA battery and make it run?

sorry for the stupid question but im just curious
Old 08-23-2005, 04:24 PM
  #2  
exeter_acres
Senior Member
My Feedback: (2)
 
exeter_acres's Avatar
 
Join Date: Sep 2004
Location: Johns Creek, GA
Posts: 7,457
Likes: 0
Received 0 Likes on 0 Posts
Default RE: 3 wires?

brushless motors are actually 3 phase AC current motors

a battery is DC current so it won't work...that is what the ESC does..converts the DC to AC
Old 08-23-2005, 11:46 PM
  #3  
jdetray
Senior Member
 
jdetray's Avatar
 
Join Date: Dec 2004
Location: Napoleon, OH
Posts: 1,617
Likes: 0
Received 0 Likes on 0 Posts
Default RE: 3 wires?

And the ESC must be one designed specifically for brushless motors. A brushed ESC won't work.

- Jeff
Old 08-24-2005, 07:11 AM
  #4  
exeter_acres
Senior Member
My Feedback: (2)
 
exeter_acres's Avatar
 
Join Date: Sep 2004
Location: Johns Creek, GA
Posts: 7,457
Likes: 0
Received 0 Likes on 0 Posts
Default RE: 3 wires?

Ooops sorry...forgot to mention that... that is correct
Old 08-24-2005, 07:41 AM
  #5  
sparkling_fist
Senior Member
Thread Starter
 
Join Date: Jul 2005
Location: London, UNITED KINGDOM
Posts: 453
Likes: 0
Received 0 Likes on 0 Posts
Default RE: 3 wires?

but theres only a + and - in a battery.. u cant get something else
Old 08-24-2005, 07:53 AM
  #6  
exeter_acres
Senior Member
My Feedback: (2)
 
exeter_acres's Avatar
 
Join Date: Sep 2004
Location: Johns Creek, GA
Posts: 7,457
Likes: 0
Received 0 Likes on 0 Posts
Default RE: 3 wires?

correct.... the battery plugs into the ESC and then the ESC plugs into the motor...

there will be 2 wires on the battery side (those are positive and negative and if they are wired backwards something will go poof)
and then 3 wires on the motor side of a brushless ESC.....
(and of course the plug that goes into the throttle channel of your Rx)
if your ESC only has 2 wires on both end than it is a brushed ESC and will not work with brushless motors
Old 08-24-2005, 09:01 AM
  #7  
sparkling_fist
Senior Member
Thread Starter
 
Join Date: Jul 2005
Location: London, UNITED KINGDOM
Posts: 453
Likes: 0
Received 0 Likes on 0 Posts
Default RE: 3 wires?

i understand what your trying to say but it doesnt really answer my question.

on the motor. one wire is +
the other wire is -
whats the third one?
Old 08-24-2005, 09:49 AM
  #8  
exeter_acres
Senior Member
My Feedback: (2)
 
exeter_acres's Avatar
 
Join Date: Sep 2004
Location: Johns Creek, GA
Posts: 7,457
Likes: 0
Received 0 Likes on 0 Posts
Default RE: 3 wires?

it doesn't work that way......

I really don't remember what each wire does, but it doesn't matter how you hook them up.....


this thread might help
http://www.rcuniverse.com/forum/m_1558046/tm.htm

it is all a bit confusing but what I do know is just hook up the 3 wires and if the prop spins backwards, reverse any two
Old 08-24-2005, 09:58 AM
  #9  
jdetray
Senior Member
 
jdetray's Avatar
 
Join Date: Dec 2004
Location: Napoleon, OH
Posts: 1,617
Likes: 0
Received 0 Likes on 0 Posts
Default RE: 3 wires?

On a brushless motor, there is no + and - (positive and negative). Instead, there are three "phases," one for each of the three wires. To repeat: There is no + and - on a brushless motor.

There are three wires on a brushless motor and three wires on the motor side of a brushless ESC. You connect the three motor wires to the three wires coming from the motor side of the brushless ESC.

On the battery side of a brushless ESC, there are two wires, same as on brushed ESC. These are + and - (positive and negative) and connect to the + and - terminals of the battery.

See the diagram below.

- Jeff

Old 08-24-2005, 07:00 PM
  #10  
ron_van_sommeren
 
ron_van_sommeren's Avatar
 
Join Date: Sep 2002
Location: Nijmegen / Nederland
Posts: 591
Likes: 0
Received 15 Likes on 12 Posts
Default RE: 3 wires?

ORIGINAL: sparkling_fist
... and cant you put 2 of the wires on to a normal AA battery and make it run? ...
Never ever do that (contrary to a brushed motor), you would be shorting the battery, big time, and thus ruin the motor and controler instantaneously. Dangerous. You can only run a brushless motor from a BRUSHLESS controller never straight from the battery.

The three wires between the motor and the controller are equivalent. Have a look at these animations and simulations of brushless motors and you'll see why:
http://www.rcuniverse.com/forum/m_27...tm.htm#2709517
Old 08-24-2005, 07:02 PM
  #11  
ron_van_sommeren
 
ron_van_sommeren's Avatar
 
Join Date: Sep 2002
Location: Nijmegen / Nederland
Posts: 591
Likes: 0
Received 15 Likes on 12 Posts
Default RE: 3 wires?

Brushless controllers explained, a bit:
http://www.torcman.de/peterslrk/SPEE...l#Anker1591256
Old 08-25-2005, 05:02 PM
  #12  
sparkling_fist
Senior Member
Thread Starter
 
Join Date: Jul 2005
Location: London, UNITED KINGDOM
Posts: 453
Likes: 0
Received 0 Likes on 0 Posts
Default RE: 3 wires?

great thanks..
i think i get it now.
Old 08-28-2005, 09:55 PM
  #13  
crazymustang
Junior Member
 
Join Date: Oct 2004
Location: NEW YORK, NY
Posts: 20
Likes: 0
Received 0 Likes on 0 Posts
Default RE: 3 wires?


ORIGINAL: ron_van_sommeren

ORIGINAL: sparkling_fist
... and cant you put 2 of the wires on to a normal AA battery and make it run? ...
Never ever do that (contrary to a brushed motor), you would be shorting the battery, big time, and thus ruin the motor and controler instantaneously. Dangerous. You can only run a brushless motor from a BRUSHLESS controller never straight from the battery.

The three wires between the motor and the controller are equivalent. Have a look at these animations and simulations of brushless motors and you'll see why:
http://www.rcuniverse.com/forum/m_27...tm.htm#2709517

hi, Ron, thanks for the detailed explanation and animation, i hve been flying brushless for last few months, just cannot go back to normal can motors. Addicted to brushless, but still need some help on the characteristic ( or properties ) of the whole brushless set up... can you pls help me to understand these terms:

slotless b'less motor,
sensorless motor,
sensorless esc,

have heard that the sensorless esc can only work with sensorless b'less motor, but dont understand how and why, therefore, in the last few months, i only use the himax 2015 and Feigao 130422 motors, and for esc, i only use pheonix 10, and Balsa product esc, i do not know if they are slotless, or sensorless, but they work well together so i dare not to change.... i always want to try some other b'less motors, but before i understan these terms, i dont want to try them blindly, can you please help to explain ... many thanks in advance...


Old 08-31-2005, 05:15 PM
  #14  
ron_van_sommeren
 
ron_van_sommeren's Avatar
 
Join Date: Sep 2002
Location: Nijmegen / Nederland
Posts: 591
Likes: 0
Received 15 Likes on 12 Posts
Default RE: 3 wires?

A slotless motor has no iron in the stator: higher efficiency, high rpm, low torque -> needs gearing

In the early days of brushless motors, the controllers used the signals from sensors in the motor to figure out rotor position and speed. Nowadays, almost all motors are sensorless. The controller gets synchronisation signals directly from one of the 3 phases (the one that's not powered). You can drive a sensored motor with a sensorless ESC but you can't drive a sensorless motor with a sensored ESC.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell or Share My Personal Information -

Copyright © 2023 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.