Mars Electric LLC Axial Flux Motor
- Thread starter Jeremy Harris
- Start date
johnrobholmes
10 MW
liveforphysics said:
Correction, YOU want a 12v wind. I am happy with 3hp :lol:
jmygann
100 kW
- Joined
- May 30, 2008
- Messages
- 1,069
44v x 55 = 2420 rpm x .85 = 2057 rpm under load
2057/336 rpm (20 mph on 20" wheel) = 6:1 ratio
14 tooth x 6 = 84 teeth on rear sprocket
16 tooth x 6 = 96
so i figure a direct drive with a quieter 14-16 tooth motor sprocket is possible on 20" wheel using a 80-92t sprocket
2057/336 rpm (20 mph on 20" wheel) = 6:1 ratio
14 tooth x 6 = 84 teeth on rear sprocket
16 tooth x 6 = 96
so i figure a direct drive with a quieter 14-16 tooth motor sprocket is possible on 20" wheel using a 80-92t sprocket
marty
10 MW
Tiberius said:You know, it looks like a whole lot of good is going to come out of this little fracas.
I wonder if that was the intention of the guy who started it
Nick
PS. Doesn't seem to be a smiley for "rhetorical question"
I think you all should give Randy some credit for stirring up quite a bit of interest in this motor. He has been preaching gear motors since way back. On the old visforvoltage.com forum, I remember Randy sending a motor to the owner of that forum. His name was Roughneck? or something like that? I remember him writing that the motor smoked. This was all before this forum started.
TylerDurden
100 GW
That might make sense if he had given credit to the folks who make the motor, the folks who *showed him* the motor, told others here where to find the motor...marty said:
...but instead he forged drawings and pimped the members for money as if he'd developed the motor.
Good thinkin there Marty.
jmygann
100 kW
- Joined
- May 30, 2008
- Messages
- 1,069
Actually , I must take part of the blame ... Randy was helping me find a motor on another forum and suggested these 2 motors and I thought it would be a good Idea to do a group buy. He doesn't need any $ and has a full life doing other things.
SRAM DD with dual freewheels and his custom motor go back before 2003 at least. He is probably working on a superior motor anyway. Sorry Randy ... see you in Maui.
SRAM DD with dual freewheels and his custom motor go back before 2003 at least. He is probably working on a superior motor anyway. Sorry Randy ... see you in Maui.
etard
100 kW
+1
If either Randy or Safe would come on here and play it cool, help out thier neighbor, lift one another up, be part of a collective community that wants none other than to come together on this wonderful contraption called an ebike, they would be welcome with open arms. But instead they have to be better and always right, and scheme on how to be right with tables and graphs of unicorns farting magic pixie dust in unsuspecting board members eyes. I myself joined when Safe was building his geared land rocket that I don't believe will ever live up to the charts and graphs, even if it is Lipo powered. I didn't know, I thought this guy must be pretty well versed, his graphs were authoritative, his extrapolations seemed to add up, I was hyped at the possibilities. Soon he was banned, I didn't know why, he seemed smart and semi level headed, a bit maniacal but he had charts dammit! :lol: Anyway, Randy did bring light to this motor, but the darkness he brings is far more detrimental. The reason he gets called out everytime he shows up, is because he is still an @€£hole and always will be.
Somebody send one to Jeremy so he can wind it with square wire and pop some ceramic bearings in there, that will wake this motor up!
If either Randy or Safe would come on here and play it cool, help out thier neighbor, lift one another up, be part of a collective community that wants none other than to come together on this wonderful contraption called an ebike, they would be welcome with open arms. But instead they have to be better and always right, and scheme on how to be right with tables and graphs of unicorns farting magic pixie dust in unsuspecting board members eyes. I myself joined when Safe was building his geared land rocket that I don't believe will ever live up to the charts and graphs, even if it is Lipo powered. I didn't know, I thought this guy must be pretty well versed, his graphs were authoritative, his extrapolations seemed to add up, I was hyped at the possibilities. Soon he was banned, I didn't know why, he seemed smart and semi level headed, a bit maniacal but he had charts dammit! :lol: Anyway, Randy did bring light to this motor, but the darkness he brings is far more detrimental. The reason he gets called out everytime he shows up, is because he is still an @€£hole and always will be.
Somebody send one to Jeremy so he can wind it with square wire and pop some ceramic bearings in there, that will wake this motor up!
AussieJester
1 TW
Well said etard couldn't have said it better...well, cept for calling Randy an asshole, bit harsh on assholes i thought
KiM
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Lessss
1 MW
Atheist
Single
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johnrobholmes
10 MW
She came in the mail pretty quick. Weight without gearbox is 6lb 1oz or about 2.7 kilos. Lamination thickness is .7mm best I can measure. 12 magnet 18 slot construction. It is a fairly easy disassemble, two long screws and a gear puller gets it apart.
Looks to be a great base of a motor. With some thinner laminations the speed could be pushed pretty high I bet. I will do some no load tests and check it at different switching frequencies to see if there is anything I can gather about the way it runs. Then it will be passed on to the next person.
I like it.
Looks to be a great base of a motor. With some thinner laminations the speed could be pushed pretty high I bet. I will do some no load tests and check it at different switching frequencies to see if there is anything I can gather about the way it runs. Then it will be passed on to the next person.
I like it.
johnrobholmes
10 MW
I don't think the KV is so slow on this one, Josh will know.
Seems to be either a 6 or 7 turn best I can count. Terminated Delta. Lots of end wire and wound like an astro.
Seems to be either a 6 or 7 turn best I can count. Terminated Delta. Lots of end wire and wound like an astro.
johnrobholmes
10 MW
Not really. It appears to be just mild steel, can't tell if it is insulated. I would hope they would insulate the lams if they go through the trouble of making them :lol:
As far as I can tell, the lamination trapazoidal stator chunks are glued onto a solid steel backing plate that screws into the housing. Not sure how they would connect it otherwise, as the backing plate is not laminated for sure.
As far as I can tell, the lamination trapazoidal stator chunks are glued onto a solid steel backing plate that screws into the housing. Not sure how they would connect it otherwise, as the backing plate is not laminated for sure.
johnrobholmes
10 MW
The return path appears to be connected from tooth to tooth by a few MM.
Best pic I could manage..
Best pic I could manage..
johnrobholmes
10 MW
Bad news for me. I noticed quite a bit of drag on the rotor, and wanted to inspect the bearings and dust shield. When I went to pull it apart the bearing didn't budge off the shaft and ended up blasting out the bearing retainer. Just a simple steel parts that screws into the face plate (only for bearing location), but still a bummer that I screwed it up.
Looks like I may be paying for or doing some repairs on this now I will see if some penetrating oil will get the bearing off the shaft. It appears to be either galled on or rusted on.
Another measurement, the shaft is 12.01mm at the bearing interface and slightly larger inside the motor case. The bearings measure at 11.98mm ID, so this may be part cause of the bearing issue.
As far as I can tell, the backing plate and the stator are two different parts. Not sure what that layer of steel on the backing plate indicates, as otherwise there are no lamination lines or indications of layers on the backing plate otherwise.
Another thought, with the size and shape of the motor we may have some recirculating currents in the faceplate and possibly the outer shell. The magnets are awefully close to a lot of stationary metal.
Looks like I may be paying for or doing some repairs on this now
I will see if some penetrating oil will get the bearing off the shaft. It appears to be either galled on or rusted on. Another measurement, the shaft is 12.01mm at the bearing interface and slightly larger inside the motor case. The bearings measure at 11.98mm ID, so this may be part cause of the bearing issue.
As far as I can tell, the backing plate and the stator are two different parts. Not sure what that layer of steel on the backing plate indicates, as otherwise there are no lamination lines or indications of layers on the backing plate otherwise.
Another thought, with the size and shape of the motor we may have some recirculating currents in the faceplate and possibly the outer shell. The magnets are awefully close to a lot of stationary metal.
johnrobholmes
10 MW
And now I see the folly. Behind the front dust shield was a hidden circlip. I would have torn up the shield trying to get it out, so at any rate my inquisitiveness would have destroyed something.
Good news is that there is no actual damage to the motor other than some internal marks. Sorry for the bumbles Josh!
Good news is that there is no actual damage to the motor other than some internal marks. Sorry for the bumbles Josh!
Miles said:
is that good?
i was kinda hoping it wasn't.
johnrobholmes
10 MW
A bit more poking around. The bearings are extremely tight on the shaft. Although not a big deal, I would recommend to the factory that they undersize the shaft by .02 or .03mm
liveforphysics
100 TW
Recirculating currents are a result of it being terminated in delta.
It's very easy to quantify if the lam thickness is a concern or not. Chart the RPM vs no-load current of a motor that can easily spin the motor you wish to test. Connect the shafts together, chart the RPM vs no-load current of the same motor again now that it's dragging the other motor along. Over-lay the current vs RPM plots, and when you see a non-linear increase in current vs rpm, you know the laminations are becoming an issue.
For example, Justin's dyno has shown for all the x530x and 9c and EZ (and maybe more) hubmotors, lamination size does not become a factor at all in the operational speed range of the motors.
Being a non-hub, I'm sure there is a point for this motor where it will be a factor, but it may be much higher than we expect fortunately.
It's very easy to quantify if the lam thickness is a concern or not. Chart the RPM vs no-load current of a motor that can easily spin the motor you wish to test. Connect the shafts together, chart the RPM vs no-load current of the same motor again now that it's dragging the other motor along. Over-lay the current vs RPM plots, and when you see a non-linear increase in current vs rpm, you know the laminations are becoming an issue.
For example, Justin's dyno has shown for all the x530x and 9c and EZ (and maybe more) hubmotors, lamination size does not become a factor at all in the operational speed range of the motors.
Being a non-hub, I'm sure there is a point for this motor where it will be a factor, but it may be much higher than we expect fortunately.
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