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13th October 2007, 12:39 AM #1
New Member
- Join Date
- Oct 2007
- Location
- Perth
- Posts
- 1
how to avtivate a brushless motor
Hi, I'm working on a project using a 12v brushless duct fan motor from a hobby jet plane that requires a Electronic Speed Control unit.
My problem is I am not using this motor for a R/C use, and need this motor to turn on and off with out a servo connected in other words I want this motor hard wired to turn on and off at a flick of manual switch or a Voltage Switch.
I have it connected currently to a servo tester which has a manual dial which you turn but the problem is that every time you turn it on you must move the dial to activate the motor.
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13th October 2007, 05:47 AM #2
Electrician
- Join Date
- Sep 2007
- Location
- Thailand
- Age
- 63
- Posts
- 90
Do you want the motor to start at full rpm or not?
“I do not think there is any thrill that can go through the human heart like that felt by the inventor as he sees some creation of the brain unfolding to success... Such emotions make a man forget food, sleep, friends, love, everything.” - Nikola Tesla.
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13th October 2007, 09:15 AM #3
Senior Member
- Join Date
- Jun 2006
- Location
- the 'burn
- Posts
- 118
it could be done with small relays and timers, but then it gets costly.
if you could describe some parameters, ie, size, cost, wieght, for a control system, that would help us in our ideas.
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13th October 2007, 10:52 AM #4
Intermediate Member
- Join Date
- Jan 2007
- Location
- Cleveland QLD
- Age
- 56
- Posts
- 16
Turbine
The brushless motor used in model planes/helicopters is effectively an AC motor, and won't run on DC. The ESC (electronic speed controller) that they use has an inverter to create a "synthetic" AC waveform that can vary the frequency/amplitude of the wave to control the speed. It doesn't need to be connected to a servo, do you mean it needs to be driven by a receiver? The cost of the ESC is minimal (under $100) when one considers the cost of any alternative system.
Scanfor
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