Truckrun RW28 - 1000W geared hub, L1019

[qwerkus]

Hello,

There have been already some post about 250W hub motors with integrated Kclamber cassette torque sensor:
Yose kit
Truckrun RN04

Truckrun seem to also offer a larger version: the rw28, up to 1000W, in both cassette and freewheel version, with l1019 motor cable. For more clarity and easier search, I created this new thread dedicated to the latter motor.

I've received the complete data pdf from a chinese reseller - see attached file. The name (AKSM001) suggests a rebranded aikema motor, manufacturer of the infamous q95, q100 and q128 hub motors. According to the same reseller, gear ratio is 1:4.3 and motor weight 5.2Kg. That would make it one heavy geared hub...
Very similar to the 750/1000W bafang geared hub.

According to the truckrun homepage, the rw28 should be available with cassette tq sensor - though I could not source one yet, and the pdf doesn't show a torque signal.

Finally, should I manage to get one, there is still a major difficulty with these motors: the limited numbers of data wires available on most motor cables doesn't allow for a direct analog transmission of all information (speed, temp, torque, cadence). Hence manufacturer choose to encode data into an uart signal - which has to be decoded on the controller side. So either you have to get the exact matching controller to your motor ... or you write your own uart decoder in lispBM for an example.
Fortunately stancecoke already did the tedious job of investigating this custom protocol on a german forum, so all there is left to do is some translation

 

[amberwolf]

Finally, should I manage to get one, there is still a major difficulty with these motors: the limited numbers of data wires available on most motor cables doesn't allow for a direct analog transmission of all information (speed, temp, torque, cadence). Hence manufacturer choose to encode data into an uart signal - which has to be decoded on the controller side. So either you have to get the exact matching controller to your motor ... or you write your own uart decoder in lispBM for an example.

Since Grin Tech ebikes.ca has some built-in cassette sensors in some motors, and use a translation board in them to get the individual signals out, you might ask if you can buy those boards from them (assuming they are compatible with the sensors used in these motors).

 

[stancecoke]

use a translation board

It's like receiving an email, printing it out on paper, and sending it on as a fax...
The BLDC controller can only work with digital information. The UART messages are digital already. Why convert them to an analogue signal and then read them in by an ADC again?!
UART may have EMC problems if the motor cable is long and very high currents flow in the motor. But with my legal build with phase currents up to 70 amps, I got no problems yet.
The protocol has a checksum, so you can ignore corrupt messages.

 

[qwerkus]

It's like receiving an email, printing it out on paper, and sending it on as a fax...
The BLDC controller can only work with digital information. The UART messages are digital already. Why convert them to an analogue signal and then read them in by an ADC again?!
UART may have EMC problems if the motor cable is long and very high currents flow in the motor. But with my legal build with phase currents up to 70 amps, I got no problems yet.
The protocol has a checksum, so you can ignore corrupt messages.

100% Agree. Grintech needs that board to ensure compatibility with their existing base/phaserunners lineup - but objectively, it makes 0-sense, especially if plugged into a vesc or and ebics controller that can be programmed to read pretty much any serial signal. I'm still trying to find a reliable reseller for truckrun, since they won't answer my mails directly, but I do hope to get my hands on this motor + integrated torque sensor.

 

[amberwolf]

It's like receiving an email, printing it out on paper, and sending it on as a fax...

Sometimes that is actually the only option to get information somewhere.

If you have never dealt with medical places, hospitals, doctors, insurance, government health bureaus, at least here in the USA, I can tell you that it is very common that they cannot or do not accept emails (although some will send them out but not accept replies--you have to voice phone call them to reply ), and instead require faxes or physical printouts or hand-filled-out forms. Frequently they also will not communicate with you in written form, and will only talk to you on the phone, which makes it difficult or even impossible for people like me with hearing issues to deal with them).

The BLDC controller can only work with digital information. The UART messages are digital already. Why convert them to an analogue signal and then read them in by an ADC again?!

For controllers that don't have any other input options, just the analog inputs.

There are plenty of people out there that can't, or don't want to, for whatever reason, change the rest of their system but would like to use one of these motors that has this kind of sensor in it.

Having the option to do so means they can have what they want, too.

Not everyone can do all the stuff you can do (or even the much more limited amount of stuff I can do), but they could bolt a motor on and connect a cable...


I know there are plenty of engineers, designers, and DIYers that think their way is the only one, and that everyone out there can and should just learn to do it that way, and spend more money when it isn't necessary...but it is not always an option. Learning issues, time, budget, etc., mean that technology adapters of various kinds are useful, even required, to let those with limitations do what they need or want to do.

Regardless of what is the "better" way to do something, it's good to think of the point of view of other people, and come up with ways to help them, too.

 

[1boris]

1:4,3 ratio not good. Mxus gdr 19 have 1:5.8 ratio and is a very good hill climbing motor.Takes a lot of power .Best hub motor I have tried

 

[qwerkus]

1:4,3 ratio not good. Mxus gdr 19 have 1:5.8 ratio and is a very good hill climbing motor.Takes a lot of power .Best hub motor I have tried

Nope. I was one of the first testers of the GDR-19 6 years ago, and won t buy mxus any time soon: quality is hit and miss, my unit was way too noisy to be useful. Also, that cable exit on the right through the axle is just bad design: you need to disassemble the connector to be able to pass a nut, so no WP connectors like the L1019 possible. Until they fixed that, I won t even look at that motor again.

 

[1boris]

Hmm,ok.My was not noisy.Gave it to a friend he is still using it up some steep mountain roads in Norway.It is a lot better than my Gmac when it comes to torque and overheating.Still as good as new.I read some of them had metal gears in the start