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Old Mar 14, 2003, 02:07 AM
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Los Angeles
Joined Dec 2002
62 Posts
brushless esc + brushed motor?

probably a stoopid question but:

is it possible to use a brushless esc w/ a brushed motor? i would rather buy one esc now and be able to upgrade to a brushless motor later.

does a brushless esc contain the timing circuitry for alternating the current to the coils in the motor, or is that circuitry part of the motor?

--tim
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Old Mar 14, 2003, 04:45 AM
(aka Cliff Lawson)
Wright Flyer's Avatar
United Kingdom, Essex
Joined Oct 2001
1,897 Posts
Not possible. A brushed ESC just varies the two wire power source to a motor using simple PWM. A brushless ESC is powering three individual coil circuits using 3-phase AC. It's a completely different beast even though the final effect (varying motor speed) happens to be the same.

Cliff
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Old Mar 14, 2003, 12:22 PM
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Los Angeles
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thanks for the reply.

why are brushless motors so expensive then? it sounds like all the timing circuitry is in the esc, and i imagine they are simpler mechanically than conventional motors.

--tim
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Old Mar 14, 2003, 12:53 PM
(aka Cliff Lawson)
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United Kingdom, Essex
Joined Oct 2001
1,897 Posts
Well brushless ESC's are more expensive than brushed ESC's because there's usually about 3 times as many expensive FETs in them.

Brushless motors are more expensive than brushed because (a) the economies of scale production - the speed 180/280/30/400 motors we use are really intended for stuff like electric toothbrushes, cordless drills, etc - Mabuchi make them by the tens of million and we cream a few hundred thousand off the top. (b) the mechanical design means hat the armature coils can be wound on machines

For brushless meanwhile they are, on the whole (a) a "niche" product only made for a few tens/hundred thousand aero modellers around the world (probably 50% of them read Ezone!!) and (b) the coils are in the "jacket" around the motor. These have to be hand wound by a single tribe of Amazonian virgins in remote village in the foothills of the Andes (and they don't come cheap!)

Cliff

PS That last bit is not ENTIRELY true
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