help with stepper.

[burro breath]

can a stepper motor from a printer be made into a brushless motor even though it has four wires coming out of it.

[fly_boy99]

Nope all ESC's are made for 3phase motors. So in orders of 3 - 9,12,15,18 etc.

The magnet poles are in order of 2 through - 8,12,14,16,18,etc.

You can DIY for a 2phase controller though...

[Tekko]

Hello! I am slowly doing a conversion like that, but for it to work the stepper needs to be rewound.

You can see my conversion here: stepper --> 2phase bldc conversion (http://hififorum.knaak.dk/Tekko/bldc%20motors/stepper%20conversion/)

[ImaBiggles]

Hello! I am slowly doing a conversion like that, but for it to work the stepper needs to be rewound.

You can see my conversion here: stepper --> 2phase bldc conversion (http://hififorum.knaak.dk/Tekko/bldc%20motors/stepper%20conversion/)

that is an eight arm stator - how are you going to make it three phases or are you going with two.

[Tekko]

Dident u read the post ? It says 2-phase ;p

[tblount70]

I'd be surprised to hear of a successful stepper flown model. They're wonderful devices when you need high holding torque or simple positioning, but the magnetics aren't really designed for high speeds. I've used them extensively in simple xy tables and in printing applications, and I've never come across one that would run well above about 6000 rpm. More often they're used in the 500-3000 rpm range.

Also beware that all steppers have a certain speed where the torque drops dramatically (don't remember the term for it). This speed is different for every stepper and has to do with the magnetic design and the switching speed. It's usually a narrow band maybe 2 or 3 percent of the usable frequency range. You can use some sort of mechanical damping to allow passing through this frequency under load, but you don't want to dwell at that speed.

If that's not enough to discourage you, consider the weight of steppers. While brushed and brushless DC motors are or have been designed into weight critical applications (full scale aircraft), I don't believe steppers have. That means any donor you start with is going to be a pretty big hunk of iron to start with.

I've been proven wrong before, so let us all know how it turns out.

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Tim in Nashville TN

[Tekko]

I use a diff rotor.