PaulD
1 kW
Thanks Nobreaks! We can only ship the kit without battery to Australia. Battery shipping overseas is a mess.Nobreaks said:
PaulD's lightweight mid drive development
- Thread starter PaulD
- Start date
PaulD
1 kW
lightrush said:
Controllers are programmed for a specific voltage. It is certainly possible to program it to work over a wide range of voltages, but you lose the ability to cutback current/power at low SOC and to prevent regen from causing an over voltage (not a problem with a mid drive like this). It's best practice to have the controller provide these rollbacks and cutouts rather than your BMS.
PaulD
1 kW
lightrush said:
Parts are trickling in. Just received freewheel parts today. Mounting plates should be here Monday, but they need to go out for anodizing. These parts are to accommodate the new torque sensor that is more robust than the Sempu. We should have kits ready in 2 weeks.
Danny Mayes
1 kW
Hey Paul,
Things have been a bit quiet around here (i have not been back for quite some time myself) but its nice to see you have been planning/scheming/working away in the back ground developing this product and still carrying the torch of innovation! Very tidy, I commend you on your effort and vision.
By the way, how did you become one of the chosen ones? Just a little jealous....
Things have been a bit quiet around here (i have not been back for quite some time myself) but its nice to see you have been planning/scheming/working away in the back ground developing this product and still carrying the torch of innovation! Very tidy, I commend you on your effort and vision.
By the way, how did you become one of the chosen ones? Just a little jealous....
PaulD said:justin_le said:That's our Grin inspired potted battery pack. 10S3P LG MJ1 cells with Grin's amazing full featured LIGO bms. It's potted in super tough UL 94 V-0 polyurethane. With our stealth quick release mounts it's a pretty tidy package.
PaulD
1 kW
lightrush said:
I've been having good results with the Erider for the last 6 months, so we are going with it. Here it is with the new freewheel hub.
Sounds fine to me .
I will sorce a battery locally.
The male power supply plug for the battery connection
!
Will you be able to supply a female to fit to the battery I supply and possibly another male plug to fit to whichever battery charger I end up using ?
I will sorce a battery locally.
The male power supply plug for the battery connection
!
Will you be able to supply a female to fit to the battery I supply and possibly another male plug to fit to whichever battery charger I end up using ?
PaulD
1 kW
Danny Mayes said:
Hi Danny, apologies for not keeping this thread updated and thanks for the compliment. I've been to busy, but I'll try harder to keep posting. Regarding the battery, are you referring to being a chosen one to use the Ligo BMS? Well, I've known Justin since college, we met at UBC probably 15 years ago. Also, I was the principal battery engineer at an e-moto company for many years, so he trusts I will build a design a quality pack with Grin's electronics.
PaulD
1 kW
neptronix said:
With the new torque sensor, Q-factor is about 180mm for a 73mm BB. I measure about 90mm each side +/- a few mm. I switched from Miranda 4mm offset cranks to 0mm since the Erider BB spindle is longer than the Sempu.
Q-factor for a 68mm BB is about 175mm.
edit: I noticed the Erider datasheet says driveside is 3mm longer, so there is a small offset.
PaulD
1 kW
Nobreaks said:
Yes, I can include this with kits shipped without batteries. We use an XT60 connector which is quite common.
In the first batch of kits, I included a chainring that was suitable for the bike type and wheel size. For example, for a 29er mtb, it included a 32T. For a 700C road bike, a 44-46T. This is a bit of a hassle since I have to stock a lot of chainrings, so I might switch to maybe 3-4 stock sizes soon. For now, I'll provide what I think will work best for each application.Joost5000 said:
Danny Mayes
1 kW
PaulD said:
No need to apologise, i know how busy life is. I'm enjoying the updates FWIW
Heheh, yeah I was referring the the LiGo BMS! Well, good for you, it's such a great solution. I adore my LiGo.
D
PaulD
1 kW
neptronix said:
Is it the q-factor or the offset that's an issue for you?
lightrush said:
It's very similar. Not sure who copied who. The main advantage is that the cadence signal is more robust (or so it seems). The Sempu T4 sometimes has issues if your BB shell hasn't been faced properly. Also, the wire exits the left BB cup, so no need to drill a hole in your frame!
Danny Mayes said:No need to apologise, i know how busy life is. I'm enjoying the updates FWIW
Heheh, yeah I was referring the the LiGo BMS! Well, good for you, it's such a great solution. I adore my LiGo.
Good to hear and thanks for the support. Yes, the Ligo is pretty amazing piece of engineering.
Danny Mayes
1 kW
Danny Mayes said:
I feel like a doof, I was making a comment about ES at large (or the Non-hob thread at least) saying it was quiet, as in from the good ol days at least, attempting to commend you on NOT being quiet! :lol:
D
PaulD said:
Probably both. A BBS02 with it's 10-15mm offset on one side caused me to develop patellafemoral syndrome on the opposite leg, which was disabling until i did physical therapy. This happened within 100 miles of riding it over the course of 2 weeks.
When my gym switched their exercise bikes to ones that had an additional inch of pedal width ( 7 inches vs the previous 6 ), i stopped using them because they hurt on both legs.
I have minor bone deformities so i'm a weird case. I thought your design was more narrow than it actually is. Darn.
PaulD
1 kW
neptronix said:
A 3mm offset can be easily overcome with a pedal washer on one side, but yes, a 6" (152mm) q factor is hard to find outside of a pure road bike. My non-e mountain bike has a 178mm q-factor which is pretty normal.
PaulD said:
I just measured my bikes and it looks like your q factor is only +5mm of my widest setup, nice.
Apparently the narrower the better for biomechanics. Compared to most mid drives your system is pretty narrow. Kudos on that!
PaulD
1 kW
Yep, for some people narrow is really important, I totally understand. I really want to do a custom torque sensor some day, just not sure if I'll ever have the time.neptronix said:
