Novice Brushless Questions - RC Groups
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Jun 08, 2003, 10:00 PM
Registered User
Tipsy_WA's Avatar

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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Jun 08, 2003, 10:34 PM
Registered Taranis User
Miami Mike's Avatar
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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Jun 08, 2003, 11:55 PM
Registered User
WJ Birmingham's Avatar
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.
Jun 08, 2003, 11:56 PM
Registered User
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.
Jun 09, 2003, 12:32 AM
Purveyor of RC-Opiates
LightFlightRC's Avatar
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!
Jun 09, 2003, 12:49 AM
Been There! Done That!
boomerace's Avatar
What everybody said but be warned.. they are addictive! The first one you install leads to a craving for more!