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Old Jun 08, 2003, 09:00 PM
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Tipsy_WA's Avatar
Perth Western Australia
Joined Oct 2002
441 Posts
Novice Brushless Questions

Is there a thread I can read regarding the science of brushless motors that will bring me up to speed on the differences when compared to brushed motors

In particular I am interested in the following:

Why the motors have 3 leads (compared to brushed pos and neg)
Are they DC
Can they be reversed etc
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Old Jun 08, 2003, 09:34 PM
Pompano Hill Flyers
Miami Mike's Avatar
Miami Lakes, Florida, USA
Joined Mar 2003
8,487 Posts
There are probably lots of threads, but let's start a new one anyway!

They are actually 3-phase AC motors - miniature versions of the motors that drive big air conditioning fans and similar equipment.

ESC's for brushless motors synthesize 3-phase alternating current from direct current. That's why they cost so much.

You can reverse a brushless motor by exchanging any two of the three leads.
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Old Jun 08, 2003, 10:55 PM
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WJ Birmingham's Avatar
St. Louis Metro
Joined Apr 2003
2,440 Posts
Don't forget the most important part... NO BRUSHES. Literally, the only thing that can wear out are the bearings, which are dirt cheap to replace.

Of course, just like any motors, you can overheat and destroy it, or as Genebond says "dork" it into the ground and break/bend the output shaft.
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Old Jun 08, 2003, 10:56 PM
Registered User
Pittsburgh, PA
Joined Jan 2002
1,271 Posts
Some benefits of BL are :
Simplicity - permanently sealed ball bearings are the only parts to wear, so very low maintenance. No brushes to wear out, run in, or to make dust.
Efficiency -generally they make better use of the battery given equivalent power ratings.
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Old Jun 08, 2003, 11:32 PM
Purveyor of RC-Opiates
LightFlightRC's Avatar
Joined Jan 2003
1,195 Posts
I've had an astro 010 barely after they came out. It still runs like new and I'm sure I have hundreds of hours on it, if not thousands. I know they are more expensive but I am convinced in the long run they are cheaper. Protect your investment with a gearbox since it will take the impact if you crash. Less weight and more thrust and RPM for less current in. Brushless is the way to be!
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Old Jun 08, 2003, 11:49 PM
Been There! Done That!
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Eugene, Oregon, United States
Joined Sep 2001
19,187 Posts
What everybody said but be warned.. they are addictive! The first one you install leads to a craving for more!
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