Search found 257 matches

by Drum
Aug 08 2018 5:03pm
Forum: EBike Non-hub Motor Drives
Topic: GNG / CYC X1 Pro 3000w
Replies: 708
Views: 97785

Re: GNG X1-pro 3000w

Hi Emaayan, Re: Torque Sensing BBs: Check the relevant ES thread for more info: https://endless-sphere.com/forums/viewtopic.php?f=28&t=94553 Sempu make various lengths: http://www.sempu.net/newsshow.php?id=1 And although they are hard to find, there are definitely photos and drawings of Sempu do...
by Drum
Aug 08 2018 2:18pm
Forum: EBike Non-hub Motor Drives
Topic: GNG / CYC X1 Pro 3000w
Replies: 708
Views: 97785

Re: GNG X1-pro 3000w

It sounds as though the bottom bracket is a separate item (which is good..) On the "Sempu and Bafang Torque Sensing Bottom Brackets" thread, and looking at the Sempu and Bafang websites, there are occasional pictures of ISIS (not square taper) torque sensing bottom brackets. I have looked ...
by Drum
Aug 08 2018 12:58am
Forum: EBike Non-hub Motor Drives
Topic: GNG / CYC X1 Pro 3000w
Replies: 708
Views: 97785

Re: GNG X1-pro 3000w

If they have done a proper job of the design & engineering, it looks interesting. Light weight, thin laminations, compact, doesn't hang down too far, stronger cranks (not square taper anymore!!), decent thick mounting plates.. Wonder if it has torque sensing? If it doesn't have any weak points,...
by Drum
Aug 04 2018 4:11am
Forum: EBike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 8330
Views: 909388

Re: New "TSDZ2 Torque Sensor Central Motor"

Hi MaartenL
Looks like the sprag clutch is slipping. The blue gear is between the motor and the chainring, the sprag clutch is between the pedals and the chainring.
With a blown blue gear, you could still pedal effectively.
by Drum
Aug 02 2018 4:02am
Forum: EBike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 8330
Views: 909388

Re: New "TSDZ2 Torque Sensor Central Motor"

"Thanks for the comments. I have some more information which may identify the problem. When the wheel is held stationary the crank arms still turn but with a bit of effort by hand. They even do this when the motor is removed from the housing. Therefore I'm wondering whether the problem may be i...
by Drum
Jul 29 2018 4:45am
Forum: EBike Non-hub Motor Drives
Topic: New "Lingbei MM28.250 torque sensor mid drive"
Replies: 394
Views: 82886

Re: New "Lingbei MM28.250 torque sensor mid drive"

Hi All, I have just discovered that one of the New Zealand designed "Smartmotion" electric mountainbikes has a bottom bracket giving both torque and cadence signals, and the control system can be switched easily between torque sensing and cadence sensing at the display. If the Lingbei cont...
by Drum
Jul 27 2018 2:10am
Forum: EBike Non-hub Motor Drives
Topic: Anyone know the wiring on Panasonic Mid Motors?
Replies: 7
Views: 1278

Re: Anyone know the wiring on Panasonic Mid Motors?

Hi Arkz, Even though you have given quite a bit of information and a photo, without a circuit diagram or manual it is hard to analyse from a distance. Hopefully somebody who has access to documentation on this motor will read your post and respond. (I guess you have already searched on the internet ...
by Drum
Jul 25 2018 4:19pm
Forum: EBike Non-hub Motor Drives
Topic: Kelly KLS7230S Identification angel operation function
Replies: 14
Views: 1988

Re: Kelly KLS7230S Identification angel operation function

Hi Phate & HD96, do you guys have access to a multimeter? If you put power to the hall sensors and all your wiring is correct and the hall sensors are working, you should be able to see the hall sensor output voltage rising and falling as you turn the motor slowly by hand. This is a good way to ...
by Drum
Jul 24 2018 3:58pm
Forum: EBike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 8330
Views: 909388

Re: New "TSDZ2 Torque Sensor Central Motor"

Hi Wayne, For the 36V motor, try Aliexpress: Okfeet sell them: https://www.aliexpress.com/item/Okfeet-eBIKE-tongsheng-inside-motor-for-TSDZ2-electric-bicycle-central-mid-motor-for-replacement-of-36V/32865525984.html?spm=2114.search0104.3.100.7c452cdesMeWMR&ws_ab_test=searchweb0_0,searchweb201602...
by Drum
Jul 24 2018 3:26pm
Forum: EBike Technical
Topic: Powerful middrive in a carbon frame (abandoned)
Replies: 28
Views: 3183

Re: Powerful middrive in a carbon frame

Hi Areus, watching this thread with much interest. I hope you can sort out the problem of freewheeling chainwheels on a strong crankset, because many systems are still based on square-taper cranksets which I believe are too weak for serious offroad riding. I like where you are going, but have you ch...
by Drum
Jul 15 2018 4:06am
Forum: EBike Non-hub Motor Drives
Topic: HUX custom carbon mid drive
Replies: 20
Views: 1602

Re: HUX custom carbon mid drive

Looks awesome Matt! Great to see a home-built carbon frame.. something I have thought about myself (too many existing projects to finish first..). Will be interested in seeing how it turns out.
by Drum
Jul 14 2018 6:59am
Forum: EBike Non-hub Motor Drives
Topic: Hi, TSDZ2 any coaster brake users? BBSHD build thoughts
Replies: 11
Views: 5104

Re: Hi, TSDZ2 any coaster brake users? BBSHD build thoughts

Hi Max H.. Another ES user told me that the lack of a sprag clutch was only one of two differences between the standard and the coaster brake version of the TSDZ2 motor: he thinks it has a different controller as well. With no sprag clutch, it is really important that the motor stops immediately you...
by Drum
Jul 07 2018 3:23am
Forum: EBike Non-hub Motor Drives
Topic: PaulD's lightweight mid drive development
Replies: 169
Views: 29778

Re: PaulD's lightweight mid drive development

Hi Paul, I am interested in your design as I also really like the torque sensing control for e-mountainbikes. Talking about a system with no crank freewheel, in many ways I find the thought a bit scary, but on a bike without a throttle and with a relatively low powered motor it should be possible. I...
by Drum
Jul 04 2018 5:44pm
Forum: EBike Non-hub Motor Drives
Topic: New "Lingbei MM28.250 torque sensor mid drive"
Replies: 394
Views: 82886

Re: New "Lingbei MM28.250 torque sensor mid drive"

Hi All, I just had an e-mail from Linda at Lingbei. Interpreting the less than perfect English, here is what it appears to say: -Within July there will be new programming to use the torque sensor better. Test samples with the new program may be available earlier; -A waterproof external plug will be ...
by Drum
Jul 03 2018 3:31pm
Forum: Items for Sale - New
Topic: FREY eMTB with Bafang m600 is developing with your ideas!
Replies: 441
Views: 47247

Re: FREY eMTB with Bafang m600 is developing with your ideas!

I rode a Trek Powerfly with a 474mm chainstay length, and it felt a lot harder to lift the front wheel over obstacles than the Turbo Levo with a 459mm chainstay, but it did climb well! Of course, they use different motors, different other geometry, and it was a different day on different trails etc,...
by Drum
Jul 03 2018 12:48am
Forum: Items for Sale - New
Topic: FREY eMTB with Bafang m600 is developing with your ideas!
Replies: 441
Views: 47247

Re: FREY eMTB with Bafang m600 is developing with your ideas!

Hi DDFred, I think the first day Frey had the new bike up on their website they had the Chainstay length listed as 474mm, which is the same as the AM1000 bike. I contacted Ivy and asked about that dimension because earlier on Frey indicated that they could get the chainstay length shorter than the A...
by Drum
Jul 02 2018 1:15am
Forum: EBike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 8330
Views: 909388

Re: New "TSDZ2 Torque Sensor Central Motor"

Hi, To add to the knowledge base being assembled: From one of my earlier posts on how to change the torque sensor (page 88 of this thread): The bearing(s) at the left-hand side of the pedal spindle are 28mm OD, 15mm ID, 7mm wide, type 6902RS, and the oil seal is the same size as the bearings. On som...
by Drum
Jun 30 2018 5:26pm
Forum: EBike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 8330
Views: 909388

Re: New "TSDZ2 Torque Sensor Central Motor"

It could be bearings inside the unit, but a couple of other things to check: -Are the pedal crank arms really tight on the square taper shaft? Sometimes a bit of play here can cause a surprisingly loud creaking sound, and that often happens at the same point in the rotation each time. -Are all of th...
by Drum
Jun 30 2018 1:44pm
Forum: EBike Non-hub Motor Drives
Topic: TSDZ2 Strange Behaviour - How to debug/identify the issue?
Replies: 25
Views: 6050

Re: TSDZ2 Strange Behaviour - How to debug/identify the issue?

Hi Alex, It does sound as if you might have a bigger problem, but lets go back to the basics for a moment: A couple of questions: 1) Are you aware that when you turn the system on, you should keep your feet off the pedals until it has gone through the whole start-up procedure? Each time it starts, t...
by Drum
Jun 25 2018 10:03pm
Forum: EBike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 8330
Views: 909388

Re: New "TSDZ2 Torque Sensor Central Motor"

I agree that there is a wide range of preferences for control strategies based on riding styles, terrain and past experience, and nobody is "wrong" or "right". I agree with Hillhater: for technical offroad riding, instant response to increased torque on the pedals (or throttle po...
by Drum
Jun 24 2018 4:32pm
Forum: EBike Non-hub Motor Drives
Topic: Bafang BBSxx - fault finding and fixes
Replies: 1054
Views: 187615

Re: Bafang BBSxx - fault finding and fixes

Hi Staldor, About the battery base modification: The bike I was working on was a Chinese hub motor bike, and it would sometimes ride fine then lose power for no obvious reason. I noticed that removing and re-fitting the battery seemed to restore power, so checked the contacts. The battery had 4 &quo...
by Drum
Jun 24 2018 3:20pm
Forum: Motor Technology
Topic: Neumotor 8057/75 middrive project, belt drive, adding halls, 10kW+
Replies: 173
Views: 38221

Re: Neumotor 8057/75 middrive project, belt drive, adding halls, 10kW+

Hi Madin, great news that you have it running again, and have figured out how to get the controller to run the motor well. Those (and similar) motors have a lot of potential, but are obviously a bit trickier to drive well than the more "conventional" motors. It is really good that you have...
by Drum
Jun 23 2018 6:49pm
Forum: EBike Non-hub Motor Drives
Topic: GP MidMotor with Torgue Sensor - "TSDZ2 Alternative"?
Replies: 3
Views: 1779

Re: GP MidMotor with Torgue Sensor - "TSDZ2 Alternative"?

Hi Alex, Look for the Lingbei mid-motor thread on Endless Sphere Non Hub Motor topic. All the information about this motor is appearing there as people learn more. It is made by a new company in China, Lingbei, and looks like it has potential to be better than the existing motors in that it seems as...
by Drum
Jun 21 2018 4:12pm
Forum: EBike Non-hub Motor Drives
Topic: Cyclone 4000W "Build motor" Vs. C3000W Vs. Tangent Ascent?
Replies: 4
Views: 1572

Re: Cyclone 4000W "Build motor" Vs. C3000W Vs. Tangent Ascent?

Hi SD, If you look on the Cyclone website, all of their motors except the "2000 - 4000W" motor have claimed efficiencies in the 85% to 89% range. The "2000 - 4000W" motor claims 97.6%, but is of similar type and configuration to all the others, so I think that is likely to be a t...
by Drum
Jun 19 2018 6:07pm
Forum: EBike Non-hub Motor Drives
Topic: BBS01B 36V 250W - trying with higher voltage [success]
Replies: 59
Views: 13071

Re: BBS01B 36V 250W - trying with higher voltage

Wizzeros, one possible solution to your issue with Low Volt Cutoff being activated early with the TVS diode in line would be to install a switch to bypass the diode. When the pack is full charged the switch can be open, letting the diode drop the voltage, then close the switch when the pack is half ...