Excess current draw.

[Tincan]

Ok, so I have my new HT motor in the drop outs (no rim) all wired up, sensors etc.

All goes fantastic.

Until I get to the very last few mm of throttle. The note of the motor changes, the motor look like it actually slows down.

But the strange thing is, the ca goes from showing ~350w to ~1450w.

I know it is programmed with the 120% setting, but that much draw and for it to slow down?

Got me scratching my head...

 

[Tincan]

Just noted the amps. On anything less than 95% throttle it would pull about 0.9 a 1.2 amps.

Keeping in mind this is just the hub with not even a rim on it. So that's about normal.

WOT it skyrockets qo 10.5 amps.

Something funky here.

 

[neptronix]

Try it with the 100% setting.
See if you get the same result.

 

[parabellum]

My 120% mode takes about double of 100% mode. And 120% mode activates from about 90% to 100% of the throttle wide.
1) If you want to dig to the root of this problem, my respect to you.
2) If you want to get rid of this problem try to gradually reprogram your controller from 120% to 119% to118% etc. until it works well.

Edit. Sorry, just in case http://endless-sphere.com/forums/viewtopic.php?f=2&t=27927

 

[Tincan]

Ok, I'll program it back to 100 when I get home and see how it behaves.

I have a 3 speed switch that when on those settings, is totally fine. I'm not sure what those positions are programmed to at the moment.

The slowing down marginally and the very quick heating of the phase wires is really unusual. And I have also upgraded te phase wires to 10 gauge as well.

 

[parabellum]

I do not know what voltage you are using and how clean is your beefing job is (you mentioned upgrading cables). Have you revised residues between traces, distances, have you sprayed some isolation afterwards?

Edit. From other treads i assume you are using 135 or something V, at this stage you should look at isolation and distances between traces.

 

[Tincan]

Interesting you mention this.

I have had this setup on my old scooter with no issues. No program changes, track upgrades etc. With the exception of the regulator resistor, it's as Lyen shipped it to me.

The wire upgrades are possibly an issue when it comes to insulation. I copied another members idea on getting 10 guar in there by removing the insulation and replacing it with shrink wrap.

I'm now starting to wonder if that may be an issue. I can't recall if the other guy was using low voltage.

Another test would be to drop it back to say 24s and see how that behaves.

 

[parabellum]

Somewhere on this forum time ago I was reading about 120% mode incompatibility to some motors. But I think geared high steed motors were negatively affected.

 

[Tincan]

You may be onto something there.

The scooter was just a cast 8x8 Ching Ching china thing. Took it laying on it's back, no worries.

I continually was toasting the phase wires on my 5x11 I had on the mongoose before the crystalyte. And now doing it with this motor.

I'm going to try some isolation tonight to see if it makes a difference.

I can't change my program at the moment since I can't find the lead lol

 

[theRealFury]

Tincan, Have you got Halls in your HT or are you running sensorless?

 

[parabellum]

Tincan, Have you got Halls in your HT or are you running sensorless?

Ok, so I have my new HT motor in the drop outs (no rim) all wired up, sensors etc.

 

[icecube57]

Its the 120% causing a spike but it should be a short high spike but the timing advance forces it to consume more current to develop more torque and speed.

 

[acid]

did you try it under load? if the motor cannot take it, it starts to stutter or it draws more current and accelerates.
pretty unefficient though...

 

[Tincan]

Interesting...

I can't load it up a whole lot at the moment as there is no rim on it (apart from a rag over the hub)

It doesn't shudder or cog.

With the 120% mode would that be something relative to crystalytes or was i just pure ass lucky with my old setup being able to take it daily?

 

[nicobie]

I read somewhere that 4110 fets can't take more than 103v. Could that be your problem?

found it: http://endless-sphere.com/forums/viewtopic.php?f=2&t=29752

 

[itchynackers]

Maybe I was just lucky, but I ran my lyen 4110 12 fet at 103V hot for about 400 miles. This was 25s lipo.

 

[parabellum]

I read somewhere that 4110 fets can't take more than 103v. Could that be your problem?

found it: http://endless-sphere.com/forums/viewtopic.php?f=2&t=29752

I believe he is using IRF4115 with max 150V

 

[bonzo]

Lyen 18Fet 4110 on a x5305...I too have experienced this, at 80V.

 

[Lebowski]

Maybe the iron in your motor is saturating ? This would cause a sudden drop in winding inductance (which in turn leads to a sharp current increase)...

 

[Tincan]

I read somewhere that 4110 fets can't take more than 103v. Could that be your problem?

found it: http://endless-sphere.com/forums/viewtopic.php?f=2&t=29752

I believe he is using IRF4115 with max 150V

This man is correct. I'm using 4115's

I finally found my programming cable so I'm going to have a play and see what happens.