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sxyrx7
Newbie

Joined: 18/01/2008
Location: New Zealand
Posts: 3

Posted: 10:08pm 23 Aug 2008

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I was just looking at some brushless motors i could use as a generator and i see thear are a lot of rc brushless motors going for a very low price

do you think this would make much power

Rotational Speed 1400 RPM/V
Continuous Current 16A
Max. Current 18A
Input Voltage 6 - 14V
Max. Efficiency 98%
No Load Current 0.5A
Internal Resistance 35m
Motor Dimensions (Diameter x Length) 26.9mm x 28.9mm
Shaft Dimensions (Diameter x Length) 2.96mm x 15mm

im hoping for around 500ma at 12v or more

GWatPE

Senior Member

Joined: 01/09/2006
Location: Australia
Posts: 2127

Posted: 11:50pm 23 Aug 2008

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Hi sxyrx7,

presumably a mazda RX7 owner?

The motors should work as a windmill generator. These small outrunner motors are high torque, relatively low rpm. They are primarily designed to swing a large propellor, without a gearbox in model aircraft.

I have a ModelMotors AXi 2828/10 that produces 0.5VAC at 60RPM. The motors are quite coggy when slowly rotated by hand. This will affect startup performance as a windmill.

You would best assess before purchase.
The unit you mention above would not be suitable.

Gordon.

Edited by GWatPE 2008-08-25

become more energy aware

Dinges
Senior Member

Joined: 04/01/2008
Location: Albania
Posts: 510

Posted: 01:44am 24 Aug 2008

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Gordon is correct; this motor is unsuitable. You can easily judge this for other motors yourself too:

Windturbines need *slow* motors/generators. The particular motor you've shown runs at 1400 RPM/V, meaning at 12V it would run at ~17.000 RPM. To generate 12V it would need to turn at around 17.000 RPM too. This is much too fast for a direct-drive windgenerator.

For comparison, my 3hp motorconversion runs at 7 RPM/V, so it'd generate 12V at ~100 RPM. The 500W motorconversion 'blue boy' runs at 250RPM for 12V, so about 20 RPM/V.Edited by Dinges 2008-08-25

sxyrx7
Newbie

Joined: 18/01/2008
Location: New Zealand
Posts: 3

Posted: 05:19am 24 Aug 2008

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Is thear a good brushless motor that could be used at a wind generator
i know the f&p is one of the best but they are too big for what i want and require too much work to setup

KiwiJohn
Guru

Joined: 01/12/2005
Location: New Zealand
Posts: 691

Posted: 05:59am 24 Aug 2008

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Weellll...... just about any stepper motor of any size has potential and they are brushless.

How big do you have in mind, 500ma at 12V? Where are you in Godzone?

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