I just want to start it:)

[Torquemada]

Hi.

So i`ve rewound Samsung 8x cdrom motor, just kile in tutorial.
I end up with 3 wires. As you have guessed I`ve got 2 phase electricity at home, so I`m stuck with these 3 wires.How do i start the motor without buying the controller?
I know i know , that controller is needed for proper functionality, but at this moment I just want to start the motor, just to make sure it spins.
I have 2 adapters at my disposal - 6v DC and 20v AC.

How can I start it at this point???

P.S. I connected 6vDC to 2 wires and motor locked up, when i try to spin it by hand it resists and tries to get back to its initial position, but current is gone it spins ok:)

[Torquemada]

Hey I have this idea.
You know that all computer cases have brushless fans, which got PCB attached to them, so i`ll try using that pcb to run my motor:)
Laters

[juki48]

one question, are you new to brushless? making motors is cheap. running them is not. you need a brushless speed control. the pheonix 10 is a prime choice. if you're not worried about weight or a few extra bucks go with the 25. there are a few good threads on this forum discussing what goes on in these motors and how they work. read as many of them as you can. you'll learn a lot in no time! 8)

[Torquemada]

Yeah thanks I already figured it (at rcgroups forum)

[Q]

Don't fool around with electricity. You'll burn yourself.
Never, ever hook up a motor directly to a transformer!!
Your questions tell me you have a lot to learn.

Take it from me you do need a speed controller for RC to run a rewound motor. The CDrom drive or PC fan type can't take the current.

Get a Phoenix10 to do things the right way. I assume you have the rest of the RC equipment.

[Torquemada]

Could you be so kind to explain why I shouldnt connect transformer to motor?

[budfly1]

Over simplified --- You have to supply a square wave pulse to each wire timed such that current can flow only in two of the wires at a time and the frequency is based on the voltage to current lag sensed as feedback from the windings as the leg of the stator moves with respect to the magnets. the more voltage applyed the greater the magnetic pull, the faster the stater approches the magnet the less the current lag there fore the higher the frequescy should be and so on and so on.

A transformer or any non intelligent device just can't do that correctly.

You will burn your windings off the motor.

[Q]

A transformer is 2 phased and you need indeed a three phase voltage controlled variable frequency pulse with each pulse 120 degrees appart.

More questions?

[ScubaSteve]

Actually you can test it... get a 9 volt battery and touch two of a leads (we'll say lead 1 and lead 2) to the + and - terminals on the battery. Then switch to leads 2 and 3. Then 3 and 1.

Now, you can do that a few thousands times a minute or just buy a brushless electronic speed controller. It's a tiny little green PCB with REALLY FAST HANDS! :wink:

[Q]

Getting a bit sacy, Steve?

[Pipistrelli]

Steve,

Now, you can do that a few thousands times a minute or just buy a brushless electronic speed controller. It's a tiny little green PCB with REALLY FAST HANDS!

I like that, it tickled my funny bone!

[ScubaSteve]

Hah, I was in a good mood for once :shock: :wink: