Nice! Very Nice! (Upcoming Grin 45mm Direct Drive motor)

[ebike4healthandfitness]

So happy to see this one coming:

Fat All-Axle Deposit

*Pre-orders Complete and Rear Fat Hubs are Shipping* - Email has been sent to all people with deposits on ordering instructions. General sales of fatbike motors will open up once we've supplied to all pre-order customers. Deposit For Grin's 45mm Fat All-Axle Motor. ETA April 2024. Entitles a...

ebikes.ca

I wonder what the right and left flange offset will be for 150mm front? Been wanting to see something that could make a dishless front wheel with disc brake for quite some time.

Also very interested what regen performance will be at slow speeds? (Since it is a big motor I reckon the efficiency will be much better than we normally expect from a smaller direct drive motor. I'm even hoping it would beat a front geared hub motor (with locked clutch) in the low speed regen department.)

 

[999zip999]

So what do you want it for ? What voltage what amps ?

 

[ebike4healthandfitness]

So what do you want it for ? What voltage what amps ?

I'm mostly interested in the regen performance and light throttle forward performance.

At lower watts the big 45mm motor would require a lighter throttle than the 27mm Grin all axle motor and thus with both motors at the same Kv and same wheel diameter (at X speed at X watts at X vehicle load) I predict a higher efficiency (all other things being equal) for the GRIN fat motor.

This motor at only 6kg affords the luxury of lower power usage:

 

[neptronix]

Appears this motor is on the ebikes.ca sim. Looks like the peak efficiency is 90.2% and it could handle some serious continuous wattage.



Nice alternative to the ol' 24lbs cromotor that was 5000w rated.

Weight still unknown, but very likely the new power density champion for DDs.

 

[kuromaku]

Also very interested what regen performance will be at slow speeds?

same numbers as drive torque... so with a good controller, should be very capable of pretty good torque even at low speeds. with the regular GAA in my daily driver setup, can decelerate at nearly 10km/h at a speed of 10kph

 

[ebike4healthandfitness]

Very impressed on how the GRIN FAT beats both the GRIN and the Leaf bike 1500w when using either 72v Phaserunner and 20" tires or 52v Baserunner and 29" tires:

GRIN FAT STD vs. GRIN STD (with 72v Phaserunner and 20" tires) when I set them both to the same Kv:

Motor Simulator - Tools

Our ebike motor simulator allows you to easily simulate the different performance characteristics of different ebike setups - with a wide selection of hub motors modeled, and the ability to add custom batteries and controllers and set a wide variety of vehicle parameters you'll be able to see...

ebikes.ca

GRIN FAT STD vs. GRIN STD (with 52v Baserunner and 29" tires) when I set them both to the same Kv:

Motor Simulator - Tools

Our ebike motor simulator allows you to easily simulate the different performance characteristics of different ebike setups - with a wide selection of hub motors modeled, and the ability to add custom batteries and controllers and set a wide variety of vehicle parameters you'll be able to see...

ebikes.ca

GRIN FAT STD vs. Leaf 1500w (Kv changed to 6T winding) with 72v Phaserunner, and 20" tires:

Motor Simulator - Tools

Our ebike motor simulator allows you to easily simulate the different performance characteristics of different ebike setups - with a wide selection of hub motors modeled, and the ability to add custom batteries and controllers and set a wide variety of vehicle parameters you'll be able to see...

ebikes.ca

GRIN FAT STD vs. Leaf 1500w (Kv changed to 6T winding) with 52v Baserunner and 29" tires

Motor Simulator - Tools

Our ebike motor simulator allows you to easily simulate the different performance characteristics of different ebike setups - with a wide selection of hub motors modeled, and the ability to add custom batteries and controllers and set a wide variety of vehicle parameters you'll be able to see...

ebikes.ca

 

[neptronix]

Well yeah, of course a motor with 45mm wide stator is going to whoop a 27mm and 35mm wide stator. Even at much lower than the load it's capable of.

I've seen scenarios where the 45mm motor is pushing 3000-4000w continuous.
That at 13lbs is incredible.
Too bad the rear model only fits in 170mm dropouts, or i'd own one.

 

[scianiac]

What I wonder is could this motor be modified perhaps to fit in the 150mm rear of a DH bike with a single speed. Maybe one of those freehub bodies gets shortened up a bit. Would have to see the available parts to get an idea the best way to go about modifying it.

 

[99zip99]

One good thing once you get up to a speed 25 miles an hour it doesn't take much to keep it at that speed and it can take the heat of regen at 45mm much better.

 

[Mongo]

The Ana Folding Bike 3 Speed Cassette Freewheel might be interesting if integrated into a (thru) hub motor - it's 9-13-17T:

 

[ebike4healthandfitness]

One good thing once you get up to a speed 25 miles an hour it doesn't take much to keep it at that speed and it can take the heat of regen at 45mm much better.

That is true.....and when you do start climbing the GRIN FAT goes faster, runs cooler and gets to the destination with less energy drained from the battery:



That means more thermal headroom available for regen during descending.

 

[99zip99]

Yes Sir. And you should use region within reason for their grand torque arm through axle I'm stating A guess.
The battery the BMS the wiring and the controller as it's giving power and then you hit the brakes and it's giving power there's resistance both ways. ! Or heat

 

[ebike4healthandfitness]

What I wonder is could this motor be modified perhaps to fit in the 150mm rear of a DH bike with a single speed. Maybe one of those freehub bodies gets shortened up a bit. Would have to see the available parts to get an idea the best way to go about modifying it.

If you could also get that with torque sensing that would be great. This for obvious reasons since you would be single speed.

 

[E-HP]

OT: Anyone know what that puff of smoke is at 7:58 of the video?

 

[marty]

OT: Anyone know what that puff of smoke is at 7:58 of the video?
View attachment 359449

Justin is holding a blue motor. Blue motor disappears. Disappears like movie magic. After it disappears all that is left is a puff of smoke.
Or?
Spontaneous combustion caused by some oily rags in the bicycle shop.
Or?
Justin is smoking some type of hallucinogenic hallucination.

 

[99t4]

The Ana Folding Bike 3 Speed Cassette Freewheel might be interesting if integrated into a (thru) hub motor - it's 9-13-17T:View attachment 359360

9-tooth rear cog almost never a good idea. Not enough teeth engagement = obnoxious chain skipping and high wear.