Search found 251 matches

by Drum
Apr 16 2019 10:11pm
Forum: E-Bike Non-hub Motor Drives
Topic: My RC Mid Drive with Single Stage Reduction
Replies: 138
Views: 8797

Re: My RC Mid Drive with Single Stage Reduction

The diode would drop 0.7V right through the range, so if you didn't reprogram the VESC you would probably lose power at full throttle. Presumably you could reprogram the "start voltage" and "full throttle voltage" in the VESC to match the reduced values caused by the diode? I have read that there ar...
by Drum
Apr 15 2019 2:57pm
Forum: E-Bike Non-hub Motor Drives
Topic: My RC Mid Drive with Single Stage Reduction
Replies: 138
Views: 8797

Re: My RC Mid Drive with Single Stage Reduction

Re E-brake switches: I would think for your setup they would not be required. If you stop pedaling, the motor assist would drop to zero quickly, and as you say, in the power range you are working in the back brake could handle the extra torque from the motor. The TSDZ2 mid-motor system with torque s...
by Drum
Apr 15 2019 2:53pm
Forum: E-Bike Non-hub Motor Drives
Topic: My RC Mid Drive with Single Stage Reduction
Replies: 138
Views: 8797

Re: My RC Mid Drive with Single Stage Reduction

Hi FZBOB, Great build, and cool that you tried different motors and setups until you settled on one that works for you. Torque sensing Bottom Brackets: You are right.. the torque applied to the chainwheels by the motor will not be measured by the torque sensor in the bottom bracket, as it will be tr...
by Drum
Feb 22 2019 1:56pm
Forum: E-Bike Non-hub Motor Drives
Topic: tsdz2 torque sensor broken
Replies: 6
Views: 343

Re: tsdz2 torque sensor broken

Hi, Some time ago I replaced the torque sensor on a TSDZ2. I posted comments and hints on the main TSDZ2 thread here on ES.. look around page 80 of that massive thread, or search my posts. A bit tricky in places, but not too bad. Long, straight external circlip pliers are the only "special" tool nee...
by Drum
Jan 16 2019 4:37am
Forum: E-Bike Non-hub Motor Drives
Topic: GNG X1-pro 3000w
Replies: 277
Views: 23226

Re: GNG X1-pro 3000w

Hi Endrew, I can't agree with your comment that torque sensing is a "very bad" way to control an e-bike. You may have ridden one or more bikes controlled by PAS (Cadence sensing) or even badly programmed torque sensing control, and formed the impression that it is a bad method to control an e-bike. ...
by Drum
Nov 20 2018 7:48pm
Forum: E-Bike Non-hub Motor Drives
Topic: GNG X1-pro 3000w
Replies: 277
Views: 23226

Re: GNG X1-pro 3000w

Hi Hyper.. Yes, a torque sensing bottom bracket has a variable output signal based on how much force you are putting on the pedals: The harder you push, the greater the output signal. How that is applied to the motor power depends on the programming of the controller, but in its basic form, doubling...
by Drum
Nov 18 2018 2:29pm
Forum: E-Bike Non-hub Motor Drives
Topic: GNG X1-pro 3000w
Replies: 277
Views: 23226

Re: GNG X1-pro 3000w

If the "freewheel" is a sprag clutch type, it should be possible to reverse it just by pressing it out, turning it over and pressing it back in.
by Drum
Oct 07 2018 2:30pm
Forum: E-Bike Non-hub Motor Drives
Topic: New "Lingbei MM28.250 torque sensor mid drive"
Replies: 297
Views: 26597

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

Hi Stancecoke, thanks for the link to that article.. it contains more information than I had. However, I disagree when you say "it is not contactless": the coils of wire are not physically transmitting current by direct metallic contact: they are electrically insulated from each other, and transmitt...
by Drum
Oct 06 2018 3:59pm
Forum: E-Bike Non-hub Motor Drives
Topic: New "Lingbei MM28.250 torque sensor mid drive"
Replies: 297
Views: 26597

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

Re: The TSDZ2 torque sensor: I'm not sure exactly what the communications protocols etc are, or the details of how they do it, but: The coils of wire are large diameter (maybe 3 inch / 80mm diameter?? - I don't have one here to measure) each attached to the rim of a disc perpendicular to the pedal a...
by Drum
Sep 07 2018 1:11am
Forum: E-Bike Non-hub Motor Drives
Topic: TSDZ2 speed sensing or torque sensing issue?
Replies: 9
Views: 365

Re: TSDZ2 speed sensing or torque sensing issue?

Hi Jean, The torque sensor I replaced was broken in a different way: there was a crack in the tube that carries the pedal torque from the pedal spindle to the main drive gear. I guess there are a lot of these motors in service, but the number of failures we hear about is a bit of a worry.. They are ...
by Drum
Sep 04 2018 12:14am
Forum: E-Bike Non-hub Motor Drives
Topic: TSDZ2 speed sensing or torque sensing issue?
Replies: 9
Views: 365

Re: TSDZ2 speed sensing or torque sensing issue?

Hi Jeanl, That's a pain to lose two torque sensors! There is a way to get into a buried menu on the controller and see what the output of the torque sensor is. Try this viewtopic.php?f=28&t=79788&hilit=hidden ... 5#p1405380 Getting the timing right in pressing the buttons to get to the buried menus ...
by Drum
Aug 30 2018 6:50pm
Forum: E-Bike Non-hub Motor Drives
Topic: Torque sensor BB DIY mid drive questions
Replies: 4
Views: 558

Re: Torque sensor BB DIY mid drive questions

In most builds using Cyclone / GNG etc motors, the motor does not drive the bottom bracket itself.. it drives a chainring that rotates around the bottom bracket but does not apply torque to the bottom bracket. So yes, in a "normal" setup the only torque the bottom bracket will see is the torque appl...
by Drum
Aug 21 2018 5:01pm
Forum: Items for Sale - New
Topic: Nucular electronics - complete kit for ev! [beta]
Replies: 438
Views: 36496

Re: Nucular electronics - complete kit for ev!

One Chinese supplier of those Sempu Torque sensors has told me that I can have one made to T3 specification, which is the same as the T4 but with ISIS crank connection instead of square taper, at no increase in cost. For serious mountain bikes, that is good news.
Watching your progress with interest!
by Drum
Aug 19 2018 5:24pm
Forum: E-Bike Non-hub Motor Drives
Topic: New "Lingbei MM28.250 torque sensor mid drive"
Replies: 297
Views: 26597

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

The Tongsheng torque sensor (photo a few posts back) actually measures torsional strain ( "twist" ) in a tube surrounding the pedal spindle. The pedal spindle is solid and has an external spline near the left-hand end. This spline feeds the torque into the tube, and the tube drives the main gear thr...
by Drum
Aug 16 2018 1:41am
Forum: E-Bike Non-hub Motor Drives
Topic: New "Lingbei MM28.250 torque sensor mid drive"
Replies: 297
Views: 26597

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

Ok, if the magnets line up with that sensor, (and it looks like they do) then PAS sensor seems likely.
It would be great to see a full strip-down of the unit.. it would answer a few questions.
by Drum
Aug 16 2018 12:36am
Forum: E-Bike Non-hub Motor Drives
Topic: New "Lingbei MM28.250 torque sensor mid drive"
Replies: 297
Views: 26597

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

Hi Kisazul, You seem to have access to information / photos of a partially stripped Lingbei motor. I agree it obviously does not have a torque sensor built onto the pedal spindle directly, but in the photo looking into the bore of the bearings there is a dark coloured component with a flat portion a...
by Drum
Aug 15 2018 3:32pm
Forum: E-Bike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 4886
Views: 358881

Re: New "TSDZ2 Torque Sensor Central Motor"

Hi John & Cecil, It is obvious that different people ride different bikes in different terrain, and the requirements of each will be different. Just because I want instant response to an increase in pedal torque, and somebody else thinks a gentler / slower ramp up of response is better doesn't make ...
by Drum
Aug 15 2018 2:53pm
Forum: E-Bike Non-hub Motor Drives
Topic: New Generations of BB Torque Sensors (Bafang and Sempu)
Replies: 27
Views: 5180

Re: New Generations of BB Torque Sensors (Bafang and Sempu)

Hi all, I have been interested in getting a Sempu or Bafang (or other make) double-sided torque sensing bottom bracket in ISIS crank format. Sempu (and I think Bafang) have photos and drawings of these on their website but I hadn't found anyone selling them. Finally found a seller on AliExpress that...
by Drum
Aug 15 2018 1:06am
Forum: E-Bike Non-hub Motor Drives
Topic: Need to lower standover height
Replies: 17
Views: 517

Re: Need to lower standover height

Yes, 26" wheels and / or smaller section tires would lower the crossbar a bit. If the tires were the same width, the difference would be maybe 3/4" (around 20mm). Quite an expensive operation for a small difference. Maybe find a second-hand pair of 26" wheels and put thin tires on.. use the 26 wheel...
by Drum
Aug 08 2018 5:03pm
Forum: E-Bike Non-hub Motor Drives
Topic: GNG X1-pro 3000w
Replies: 277
Views: 23226

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 double...
by Drum
Aug 08 2018 2:18pm
Forum: E-Bike Non-hub Motor Drives
Topic: GNG X1-pro 3000w
Replies: 277
Views: 23226

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 on Aliexpr...
by Drum
Aug 08 2018 12:58am
Forum: E-Bike Non-hub Motor Drives
Topic: GNG X1-pro 3000w
Replies: 277
Views: 23226

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, and...
by Drum
Aug 04 2018 4:11am
Forum: E-Bike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 4886
Views: 358881

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: E-Bike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 4886
Views: 358881

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 in the...
by Drum
Jul 29 2018 4:45am
Forum: E-Bike Non-hub Motor Drives
Topic: New "Lingbei MM28.250 torque sensor mid drive"
Replies: 297
Views: 26597

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 controller / d...