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08-11-2022, 01:59 PM | #1 |
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Anybody know about BLDC motors?
So, the motor on my Phantom ESC failed lately and I'm trying to find a replacement. These are specs I measured.
Motor housing: Dia 55mm Lt 67mm Shaft: Dia 8mm Lt 67mm It uses 28VDC and is thought to be 4KW and 150A and spins around 50k rpm. A real beast of an RC motor. I think it was for a large electric ducted fan. I'm learning but don't know a lot about BLDC's. I think it's a 6 pole but not sure. It seems to have 6 magnets on the rotor and 6 coils on the stator. Can anyone help me with this? The only really important specs are 28 VDC, 50k rpm and an 8mm shaft |
08-11-2022, 07:47 PM | #2 |
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try an r/c hobby forum?
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08-12-2022, 01:20 AM | #3 |
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These motors have a kv rating, kv meaning how many rpms the motor does per 1volt. They also have a S or voltage rating and max amps. They go way deeper best to google.
The batteries are usually lipo and are rated 3.7v a cell,flat voltage. So 1S is 1cell 3.7volts(4.2v charged), 2S is 7.4v(8,4v), 3S is 11.1v(12.6v) and so on. They also have mah capacity and a C rating for discharge current. https://www.google.com/aclk?sa=l&ai=...WgQ0Qx6BAgDEAE
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08-12-2022, 11:06 AM | #4 |
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It's also sensorless from what I can tell from the picture, meaning the ESC doesn't get feedback from the motor to tell it's stator position.
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08-12-2022, 11:34 AM | #5 |
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Yeah
It only has three wires attached to it. And after closer inspection, it looks like it has 4 magnets and 6 coils. I ordered some new bearings. I'm going to see if i can bring it back to life. The bearings are only 15 bucks so it's well worth a try. |
08-12-2022, 11:41 AM | #6 |
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Might be worth testing across all the phases(not sure if that is the right term here but i'll go with it) with a multimeter. You could have a short in a winding or something. What is it doing exactly?
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The Following User Says Thank You to NoHaveMSG For This Useful Post: | WNDSRFR (08-12-2022) |
08-12-2022, 12:28 PM | #7 |
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What happened is it seized. I took it apart by pushing the rotor out. It has a lot of magnetic force holding it in. Then I put it back in and it is no longer seized. I think what happened is: the bearing or bearings failed. I think one or more balls got stuck to the magnets and gummed it up. The balls were tiny. There were still a couple left but the bearings are gone. Except for the bearings everything else looks OK.
I have no speed control so it's going to be scary testing this thing. It's either 50,000 rpm or off. Should be fun. |
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08-12-2022, 12:45 PM | #8 | |
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Quote:
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08-12-2022, 01:12 PM | #9 |
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I can`t see how it will run up this way. Please explain.
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08-12-2022, 08:22 PM | #10 |
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not enough load to slowly wind up.
it goes like this
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08-13-2022, 08:55 AM | #11 | |
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Quote:
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08-13-2022, 09:00 AM | #12 |
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It has a motor controller/battery charger. But the controller has two states: off or on. It is switched by a normally open switch activated by the gas petal. It is set to be full on at about 80 percent throttle.
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08-14-2022, 07:02 AM | #13 |
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F86D Sabre Dog 5kw 50v EDF only a bit over 100amps + - losses. Mine 10+ years ago?. It still runs 150mph.
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Wait until my Flex capacitor hits 88
Last edited by gen3v8; 08-14-2022 at 07:25 AM. |
The Following User Says Thank You to gen3v8 For This Useful Post: | WNDSRFR (08-14-2022) |
08-14-2022, 07:25 AM | #14 |
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That might just work! The compressor wheel on mine is 98 mm and weighs 98 grams. Can you give me a manufacturer and model number? I just need the motor not the edf.
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