Search found 257 matches

by Drum
Oct 25 2019 6:39pm
Forum: E-Bike Non-hub Motor Drives
Topic: Motor Cuts Out Randomly
Replies: 24
Views: 545

Re: Motor Cuts Out Randomly

Hi Tyro, People who might be able to help you will need a lot more information than you have given.. Is it a factory e-bike or aftermarket kit, motor type, does it cut out while using throttle or while pedaling (or both), does the system use torque sensing or cadence sensing for the pedal assist, wh...
by Drum
Oct 23 2019 3:05am
Forum: E-Bike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 6091
Views: 522733

Re: New "TSDZ2 Torque Sensor Central Motor"

Beware of taping the cable carrying the power to the motor tightly against any of the other cables. There have been reports of strange problems caused by "crosstalk" between the motor cable and sensor cables. It would be a good idea to keep the motor cable separate from sensor cables etc.
by Drum
Aug 16 2019 2:37pm
Forum: E-Bike Non-hub Motor Drives
Topic: Best Motor for friction drive
Replies: 3
Views: 347

Re: Best Motor for friction drive

For friction drive, the size of the tire doesn't matter.. the wheel is acting as an idler gear, transferring the surface speed of the motor to the road. In other words, the road speed will be the same as the surface speed of the motor (or drive roller) regardless of wheel diameter. You can work out ...
by Drum
Jul 16 2019 3:28am
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike
Replies: 4188
Views: 346662

Re: Sur-Ron - New Mid drive Bike

One reason for not using hydraulic pressure to bring in regen is that you want regen to kick in before the brakes come on, not after. Ideally regen would be triggered by movement of the brake levers before the brake pads touch the disc, so before any hydraulic pressure is developed in the brake hose.
by Drum
Jun 12 2019 6:21pm
Forum: E-Bike Non-hub Motor Drives
Topic: Bafang M500/M600 thread
Replies: 74
Views: 6504

Re: Bafang M500/M600 thread

Also check out the Frey aluminium framed bike developed over the last couple of years with the help of ES members. Frey started a thread on this bike recently: https://endless-sphere.com/forums/viewtopic.php?f=28&t=100413 But I see one of the moderators has asked them to move it to the "Sales" area ...
by Drum
May 05 2019 5:48am
Forum: Items for Sale - New
Topic: FREY eMTB with Bafang m600 is developing with your ideas!
Replies: 195
Views: 28863

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

Looking Good!
I think you have the geometry and looks sorted well.
What is the suspension travel, front and rear, how heavy is it, and what is the maximum tyre size that can be fitted?
by Drum
Apr 16 2019 10:11pm
Forum: E-Bike Non-hub Motor Drives
Topic: My RC Mid Drive with Single Stage Reduction
Replies: 324
Views: 25680

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: 324
Views: 25680

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: 324
Views: 25680

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: 874

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 / CYC X1 Pro 3000w
Replies: 440
Views: 48926

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 / CYC X1 Pro 3000w
Replies: 440
Views: 48926

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 / CYC X1 Pro 3000w
Replies: 440
Views: 48926

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: 361
Views: 44024

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: 361
Views: 44024

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: 532

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: 532

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: 799

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: 822
Views: 71645

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: 361
Views: 44024

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: 361
Views: 44024

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: 361
Views: 44024

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: 6091
Views: 522733

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: 31
Views: 9814

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: 805

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...