Shengyi X1 maximum phase current

[treewell]

I've set up a front hub ebike for my wife using the new Grin X1 motor and Baserunner Z9 with 52v battery. It is promoted as very powerful for its size. The baserunner X1 default file limits power to 1000 watts. And that is plenty.

But I'm confused about the Phase Current limit. The default file limits to 45A while the baserunner itself is capable of 55A. And the motor simulator shows 54A maximum motor current.

https://ebikes.ca/tools/simulator.html?motor=MDGWX&batt=B5216_GA&cont=BRZ9&wheel=650b&hp=0&axis=mph

Grin tech support is slammed these days and all I've been able to glean is that one tech seems to think 45A is plenty. I've tried to determine what the risk is of bumping this up to, say, 50A. My goal is to improve acceleration off the line when carrying 30lb groceries. Not planning big hill climbs where motor might overheat (in any case, X1 has a thermistor and CA3 will rollback on overheating).

Would appreciate advice if anyone has experience with this new motor and practical limits to phase current, injection current, voltage ramps. Want to increase performance without damaging motor.

https://ebikes.ca/product-info/grin-kits/shengyi-sx-geared-hubs.html

 

[E-HP]

Well 54.8 is closer to 55 than 54. Anyway, I'd max it out. Simulator shows a noticeable increase in torque (21%) up to 8mph, but not much difference after that.

https://ebikes.ca/tools/simulator.html?motor=MDGWX&batt=B5216_GA&cont=cust_25_55_0.03_V&wheel=650b&hp=0&axis=mph&cont_b=cust_25_45_0.03_V&motor_b=MDGWX&batt_b=B5216_GA&wheel_b=650b&hp_b=0&bopen=true

 

[treewell]

I'd max it out.

What is worst case if this is too much? The bike is adequate as is and wife wouldn't be happy if I mess it up. On other hand she'd be very happy with a little more acceleration from a stop light.

I have an eZee front hub motor with baserunner L10 and 52v battery. Phase current at 80A (the controller max), 1500watts. Increased various parameters until got error messages and then backed off with no harm. It has more acceleration than needed at any rate.

So if I don't hear back from Grin in a few days w/ specific reason not to increase phase amps I'll go ahead and experiment. If I ruin motor then they should surely change the simulator config that clearly shows the X1 operating at 55A.

 

[E-HP]

I'd max it out.

What is worst case if this is too much? The bike is adequate as is and wife wouldn't be happy if I mess it up. On other hand she'd be very happy with a little more acceleration from a stop light.

I have an eZee front hub motor with baserunner L10 and 52v battery. Phase current at 80A (the controller max), 1500watts. Increased various parameters until got error messages and then backed off with no harm. It has more acceleration than needed at any rate.

So if I don't hear back from Grin in a few days w/ specific reason not to increase phase amps I'll go ahead and experiment. If I ruin motor then they should surely change the simulator config that clearly shows the X1 operating at 55A.

Something you'll need to decide. Sounds like you could either by the hero by getting more acceleration, the buffoon if the motor breaks, or the inept when you say "sorry honey, it can't be done". The last is probably safest; no guts no glory and all.

Seriously, you're not talking a lot of power. If you fed it too much, it could strip the plastic gears I guess. I'm in the no guts, no glory camp, but on the other hand, they also say that perfect is the enemy of good, and only you know how bad the downside could be.

 

[maiz]

I'd max it out.

What is worst case if this is too much? The bike is adequate as is and wife wouldn't be happy if I mess it up. On other hand she'd be very happy with a little more acceleration from a stop light.

I have an eZee front hub motor with baserunner L10 and 52v battery. Phase current at 80A (the controller max), 1500watts. Increased various parameters until got error messages and then backed off with no harm. It has more acceleration than needed at any rate.

So if I don't hear back from Grin in a few days w/ specific reason not to increase phase amps I'll go ahead and experiment. If I ruin motor then they should surely change the simulator config that clearly shows the X1 operating at 55A.

what became of this? did you get the hub? did grin get you a better answer? on the fence between the x1 and the ezee myself.

 

[meepmeep22]

Heyo,


The concern with the higher phase currents on the ShengYi motors is related to the possibility of stripping the nylon planetary gears inside the motor. We actually had to tone down the phase currents on our Grinfineon 25A controllers because of this specific issue on the Bafang G-Series motors.

Hope this helps!

Max

 

[neptronix]

Buy a replacement set of gears and go for the phase amp bump up if you need more initial torque.

As always with boosting power to a motor, keep an eye on heat after your first ride. If you start noticing significantly more heat after this.... might be a good idea to tune the power down so the stator doesn't go melty.

The shengyi is one of the most efficient geared hubs on the market today, beating the ezee and mac motors. They can be pushed a bit.. the real limit is the gears' strength.

 

[neptronix]

ps, in your simulator link you have a DWGX instead of a SX. DWGX is a much smaller motor.