A New Electric-Assist Solution

[狂澜9]

Compatible with both IS and PM direct-mount standards.Silent Sine Wave Control.
It features a maximum torque of 35 N·m (approximately equivalent to 105 N·m in a mid-drive motor). The weight of a single motor is approximately 2 kg (pending final confirmation). With 10 distinct assist levels, speed tests conducted under a 70 kg load yielded the following maximum speeds: Level 0—0 km/h; Level 1—7 km/h; Level 2—11 km/h; Level 3—16 km/h; Level 4—20 km/h; Level 5—24 km/h; Level 6—28 km/h; Level 7—32 km/h; Level 8—36 km/h; and Level 9—40 km/h.
I am Chinese, so there might be some issues with the translation.Perhaps it can give you more inspiration.

 

[lnanek]

Looks like an upgrade to this older version that used a cog and chain attached to the brake rotor instead of a belt?

https://a.co/d/0eyDHwG4

Doesn't seem to be rated highly, unfortunately. I think I've seen similar approaches that just had the motor spin the rotor and others that replaced the rotor and handled the braking themselves too.

Maybe this solution will eat chains less than a mid-drive at least. Seems to have a pedal assist sensor which could make 30mph legal in the US as well. Name brand options like Electric Motor Drives | Custom Design | USA Assembly didn't have that, so couldn't exceed 20mph, I think.

 

[User6969]

Cool design. I wish i had a CNC too.
Id like to see a bigger motor for more torque and power so it has an advantage over a small geared hub motor.

Maybe this could be an alternative to the overpriced grin all axle motor for Thru-Axle MTBs

 

[neptronix]

Very interesting. I've wanted a drive like the Aden powerkit for a long time, but was turned off by the fact that there's no good water sealing.
Aden Powerkit Sport V2 - 1500W Spoke drive

Same problem with this drive due to motor choice, but that seems fixable.

Is this a DIY project or do you wish to commercialize it?
Also how much peak power are you pushing?

 

[mrmojorising]

Very interesting. I've wanted a drive like the Aden powerkit for a long time, but was turned off by the fact that there's no good water sealing.
Aden Powerkit Sport V2 - 1500W Spoke drive

Are you aware of the bimotal drive? Elevate Ebike Conversion Kit

It's very expensive but similar concept and very refined. Considering they have an option for search and rescue teams I'd imagine it's pretty water proof

Although I've been waiting for some talented Chinese engineers to make one for 1/5 of the price looks like @狂澜9 is on track

 

[neptronix]

I've heard of it, $2k for a 750w nominal drive is kind of crazy though. Can't buy it without the battery to save money either.
This could easily be within the average cost of a mid drive, and below the average weight of a mid drive.

It's better than a dual reduction geared hub motor because you can run your reduction out the unit and use an inrunner ( copper's heat can effectively make it's way out the case, so power density will be higher )

BikeOn is a similar concept but uses the bike's gears to drive. I think driving the disc brake side is a lot less messy though.
BikeOn - Transform Your Bicycle Into A Smart E-bike In Seconds

 

[mrmojorising]

@neptronix They do have an option for motor only, but it's still $1500 and a bit hidden on the website. I have a feeling they either really struggled to scale production or have acquired some sort of commercial contract where they don't care about bringing price down anymore. If it was below $500, it would've been a great option for many. Especially because it is so easily removable

 

[neptronix]

$1500 is still too much.
I can buy a very high efficiency 4lbs 1kw rated mid drive ( lightest.bike drive ) for $1000, and it has a lot more parts internally and externally.
Or a really nice hub motor for half the money!

It's very hard to scale up these kinds of parts, yes. But if you have only game in town pricing, you're going to make a lot less money due to lower volume if you don't scale up. When i see a company not doing that, i assume they're not going to be around longer in some years, because this is usually the case.

The asian companies always go for the volume play because they know that's where the money is made, and they have the manufacturing capability to make it easily happen. More ingenuity is needed if you're outside the manufacturing superpower - but it is still technically possible.

 

[狂澜9]

很方便。我一直想要一个像Aden Powerkit那样的硬盘驱动器，但之前因为它的防水性能不好而犹豫不决。
Aden Powerkit Sport V2 - 1500W 辐射条驱动

由于电机选择的原因，这款驱动器也存在同样的问题，不过似乎是可以解决的。

这是你自己动手做的项目，还是你想把它商业化？
另外，你的最高权力是多少？

很有意思。我一直想要一个像Aden Powerkit那样的硬盘驱动器，但之前因为它的防水性能不好而犹豫不决。
Aden Powerkit Sport V2 - 1500W 辐条驱动

由于电机选择的原因，这款驱动器也存在同样的问题，但这似乎是可以解决的。

这是你自己动手做的项目，还是你想把它商业化？
另外，你的峰值功率是多少？

这是一个个人 DIY 项目，在 36V 电压下可提供 750W 的峰值功率；目前已在家庭爱好者社区开放预订。

 

[狂澜9]

看起来像是老版本的升级版，老版本是用齿轮和链条连接到刹车盘上，而不是用皮带？
[附件]388378[/附件][附件]388379[/附件]

https://a.co/d/0eyDHwG4

遗憾的是，它的评价似乎不高。我见过一些类似的方案，有的只是让电机带动转子旋转，有的则更换了转子，并自行实现制动。

这种方案可能比中置电机更省链条。它似乎配备了踏板辅助传感器，这可能至少让它在美国合法达到30英里/小时的速度。定制设计| USA Assembly这样的知名品牌产品就没有这个功能，所以我觉得它的最高时速不能超过20英里/

看起来像是老版本的升级版，老版本是用齿轮和链条连接到刹车盘上，而不是用皮带？
View attachment 388378View attachment 388379

https://a.co/d/0eyDHwG4

可惜的是，它的评价似乎不高。我见过一些类似的方案，有的只是让电机带动转子旋转，有的则更换了转子，并自行实现制动。

或许这种方案至少比中置电机更省链条。它似乎配备了踏板辅助传感器，这或许能让它在美国合法达到30英里/小时的速度。像Electric Motor Drives | Custom Design | USA Assembly这样的知名品牌产品就没有这个功能，所以我觉得它的最高时速不能超过20英里/小时。

这不一样；你还没发现其中的区别。

 

[offGridDownUnder]

Does this offer regenerative braking?

 

[狂澜9]

不，它采用单向离合机构；滑行时电机不会旋转。

它具备能量回收制动功能吗？

 

[offGridDownUnder]

不，它采用单向离合机构；滑行时电机不会旋转

Note to others reading who may not know of or have this facility - Google Translate rendered this as:

No, it uses a one-way clutch mechanism; the motor does not rotate when taxiing

I wondered after seeing the belt snubber in the picture. I wondered if this was strong enough for reverse loads.

Note to the OP ("Original Poster" - the author of the thread). I do not know why Google Translate selected "taxiing" in this case. Taxiing is a valid word, but is usually a powered motion. The word for rolling on a bicycle without power is commonly "coasting". Of course, you probably used a correct phrase in your original reply - I only know what Google Translate supplied.

 

[glennb]

You've done a great job.

I still use an original Currie on a kick bike, but by modern standards it's too heavy, loud, and inefficient. Nice to see a modernised version.

Looks plenty rigid. I wouldn't set 2kg as an aritrary goal. It weighs what it needs to. Customers who care about grams can always attack it with drills and files.

Perhaps allow a few extra grams for shrouds over those finger-munching belts too.