Damn it

Left it at work when I loaded all the crap into the ute for tomorrow Bundy Rum trip!

Will have to wait till tomorrow night to pull it apart... Might go pick up the big stubby motor I found down there too...
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Okay. I have 3 motors now.

One is a 750watt continuous motor (The one I posted photos of)
One is a 2200watt continuous motor
One is unknown

These motors are built hella tough, and once they die... there is no pulling them apart to rebuild them... They are a throw away job... But if your looking at building your own motor, these things are awesome!!!

I'll take some photos soon, but lets just say, to get to the good stuff, I've had to use a 10" drop saw and an angle grinder
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Photo time.


The 2.2Kw motor... 500mm long and around 16kg


The 750watt motor diesected.... I just used the drop saw...


This sorta resembles what it looked like before the drop saw and grinder attacked it


Close up of the 18T stator.... 90mm OD


The inner armature. It's not actually magnetic.... Seems to just be similar to a normal armature, minus the windings... Might look at making some NIB replacements...


Just a snap against the ruler


140mm of stator to play with... I reckon, 2-3 motors can be made from this.


Parallel to each other. Armature and Stator


A few of the stator laminates that I just cut into with the drop saw...

Just gotta clean some crap out the center of the stator and look at removing the windings, which could be a lot of fun.
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That is not a DC brushless motor but a AC squirel cage induction motor. The rotor has a seires of conductive bars running up its length attached to a conductive ring at each end forming something like a cage. When the stator windings generate a rotating magnetic field eddy currents are generated in the rotor which causes the rotor to spin (simple explanation). These motors are very comon in industry due to how cheap they are to make and how long lasting they are.
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quote:

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That is not a DC brushless motor but a AC squirel cage induction motor. The rotor has a seires of conductive bars running up its length attached to a conductive ring at each end forming something like a cage. When the stator windings generate a rotating magnetic field eddy currents are generated in the rotor which causes the rotor to spin (simple explanation). These motors are very comon in industry due to how cheap they are to make and how long lasting they are.

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if the armeture isnt magnetic then its an induction motor mine was very strongly magnetised

Just having a google around, found this link

According to it, they use aluminium as the conductor bars, which this armature certainly has. So I stand corrected, it's an induction motor, but with the 18T stator, I think it is still going to be usefull for making an inrunner.
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thought so when i saw the armeture in the pic , mine was made from a stainles steel sheath with nedynium magnets inside it(they turn to dust and burn brightly when you cut through them with an angle grinder lol ) it had no lamanations and the whole rotor ran in water for cooling .

Ok, you cannot run two brushless motors off the same esc in parallel, but do people think two brushless motors would be able to turn the same mass (ie, attached to the same weapon/prop etc).
If not i can just use a bigger one...
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I cant see why not. A brushless controller will sense the position of the rotor and its motor and adjust the pulses accordingly.

So even if they arent putting out exactly the same power, it just means one of them will be running a little bit below its load/power rpm while the other is at it. The difference is likely to be pretty small though.

All off-the-top-of-my-head musings though. anyone else differ ?
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quote:

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Originally posted by Spockie-Tech:
I cant see why not. A brushless controller will sense the position of the rotor and its motor and adjust the pulses accordingly.

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There was a thread on the RFL forums about this. I believe you can only do this if you sync both motors together. Otherwise the sensorless controllers will have big problems due to the way they detect the position using the 3rd phase.
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If you attach the shaft of both motors together and they are in synchronization when you do this then theres no reason it shouldn't work..
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They would be used in friction drive, so they wouldn't stay in sync for long.
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If you can spare the weight, seperate controllers give you redundancy
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