Search found 979 matches

by miuan
Feb 21 2018 9:38am
Forum: Items for Sale - Used
Topic: MXUS 5k turbo!!
Replies: 7
Views: 1696

Re: MXUS 5k turbo!!

Still available? 600 for motor or whole package?
by miuan
Jan 17 2018 8:46am
Forum: Battery Technology
Topic: Are my charged cells within ok range of balanced?
Replies: 20
Views: 1079

Re: Are my charged cells within ok range of balanced?

A friend passed me his highly unbalanced LiFePO4 BMS equipped 12Ah battery. I got no more than 2Ah out of it - it was so unbalanced. Ultimately I got as much as 11Ah out of it. The way I did it was very easy. Connected a hair dryer to the discharge lead, so the charging process wound never end, and ...
by miuan
Dec 06 2017 5:06am
Forum: E-Bike General Discussion
Topic: Run motor with insufficient amp batteries damaging?
Replies: 12
Views: 744

Re: Run motor with insufficient amp batteries damaging?

Keep the BMS. The cells are fine with up to 200A burst. Make sure the rest of battery build is sturdy enough to sustain the peak current your starter will draw. Then build a simple external switching circuit, triggered by BMS output.
by miuan
Nov 22 2017 4:21am
Forum: E-Bike Technical
Topic: Shengyi Motors
Replies: 10
Views: 776

Re: Shengyi Motors

A 1 turn climbs with exactly the efficiency of a 10 turn, and it draws no added power from the pack to do it, but it does place more burden on the controller to buck the pack voltage to the voltage the motor uses during the climb. Agree that the difference in overall efficiency will be miniscule, o...
by miuan
Nov 21 2017 2:23pm
Forum: E-Bike Technical
Topic: Shengyi Motors
Replies: 10
Views: 776

Re: Shengyi Motors

Provided the controller can't put out more than 30/35A phase current, the slower motor may have about 10% higher torque at startup (under 7-8mph) and will be a hair more efficient. Not much of a difference though...
by miuan
Nov 15 2017 8:43am
Forum: Motor Technology
Topic: Neumotor 8057/75 middrive project, belt drive, adding halls, 10kW+
Replies: 126
Views: 12388

Re: middrive motor, small and powerful -> Neu 8057/75 or??

Hi Madin, I really can't help with belt drives, but before you get into all the trouble of building one, have you tried a MAC on the Votec? I really love the MXUS 3k on my steel fatbike (pic attached). Road bump filtering with the 4 inch tyre is second to none. Even for light trails, the fatbike rid...
by miuan
Oct 01 2017 3:42am
Forum: General Discussion
Topic: Canine assist
Replies: 4
Views: 491

Re: Canine assist

Done that once. More adrenaline than a timed downhill run, everything was out of my control :)
by miuan
Sep 14 2017 8:28am
Forum: Items Wanted
Topic: 72V 6-fet sine wave controller w/regen EUROPE
Replies: 0
Views: 216

72V 6-fet sine wave controller w/regen EUROPE

I am looking for a suitable small controller to power a 9C 2809 slow wind motor.
Will be run at 20S.
by miuan
Sep 13 2017 2:54am
Forum: E-Bike Technical
Topic: Edge 1,500 and 3.25mm spoke holes and 13ga 2.25mm spokes
Replies: 11
Views: 483

Re: Edge 1,500 and 3.25mm spoke holes and 13ga 2.25mm spokes

I second Chalo. It's worked wonders for me, on motorized and pedal hubs alike.
The key is to move the straight section of spoke as close to the flange as possible, so the J-bend won't get stressed under load.
by miuan
Aug 21 2017 4:32pm
Forum: Battery Technology
Topic: Turnigy Multistar - lightweight 10C cells
Replies: 514
Views: 58432

Re: Turnigy Multistar - lightweight 10C cells

I ran 10Ah multistars with 80A peak controller and they did get very warm after a couple aggressive rides. 5C peaks are fine. Just make sure you weed out every suspicious pack. It sure IS a costly decision with such big packs. Also DO reconsider building the battery out of high grade 18650s. They ar...
by miuan
Jul 26 2017 5:53am
Forum: E-Bike General Discussion
Topic: 20/24" fork dropouts vs 16T high torque Mac motor?
Replies: 6
Views: 682

Re: 20/24" fork dropouts vs 16T high torque Mac motor?

A modern disc brake with radial master cylinder like e.g. Formula RX, RO or T1 has enough power AND modulation for your purpose. I advise against Shimano Servo Wave or Hope brakes as the few I've ridden had terrible modulation, albeit good braking power. Get a small brake rotor, you will not need mo...
by miuan
Jul 26 2017 2:41am
Forum: E-Bike General Discussion
Topic: I never had a tire do this before.....
Replies: 19
Views: 1046

Re: I never had a tire do this before.....

What brand of tyre do you use? Some manufacturers make too loose fitting (too high diameter) beads and combined with a too small diameter rim, the bead is sometimes not seated properly and allows one side to sit too low while the opposite side is allowed too close to outer rim edge, risking a blow l...
by miuan
Jul 13 2017 8:41am
Forum: E-Bike General Discussion
Topic: snapping spokes
Replies: 23
Views: 1867

Re: snapping spokes

Over years, I have encountered 3 principal causes of broken spokes. 1. Radical spoke angle Remedies: Custom drilled spoke holes to get angle over 80 degrees (a 2-hour DIY job) Assymetrically drilled rims (moto rims or Ryde Andra bicycle rims) - loose spoke elbow at hub flange Remedy: insert brass wa...
by miuan
Jun 28 2017 2:19am
Forum: Battery Technology
Topic: Simple charge voltage limiter board
Replies: 19
Views: 1884

Re: Simple charge voltage limiter board

It seems to only be advertised for 220V. I'd love to try that for you, but there is no 110V outlet nearby... We are talking the XH-M602 boards however. There is a XH-M604 too, and it's fed directly by DC from charger. Instead of charger power, it switches battery connection. It's limited to 80V thou...
by miuan
Jun 28 2017 2:13am
Forum: Battery Technology
Topic: Turnigy Multistar - lightweight 10C cells
Replies: 514
Views: 58432

Re: Turnigy Multistar - lightweight 10C cells

Is it ok to connect 6s 8000mah graphene pack (internal resistance 5mΩ) to 6s 16000mah multistar (internal resistance 9mΩ)? I would use these pack three in series so it would total 18s 24000mah. As long as the discharge curves match each other and the parallel wiring doesn't have to handle excessive...
by miuan
Jun 14 2017 8:49am
Forum: E-Bike Non-hub Motor Drives
Topic: Possible to make a trapezodial motor run on sinusodial cont?
Replies: 26
Views: 1744

Re: Possible to make a trapezodial motor run on sinusodial c

Should i connect the battery, usb to pc and controller when performing the test? No i have no other controller :( But will the sabvoton be able to run trapezodial motor? You have to disconnect everything before performing the motor phase test. But when disconnecting the controller, do it one phase ...
by miuan
Jun 14 2017 8:02am
Forum: E-Bike Non-hub Motor Drives
Topic: Possible to make a trapezodial motor run on sinusodial cont?
Replies: 26
Views: 1744

Re: Possible to make a trapezodial motor run on sinusodial c

Yes. All 3 output between 0. and 5v. So that shouldent be an issue. I dont know about phase wires. How can that be checked? turn the rotor by hand. then connect any 2 out of 3 phase wires together. see if the motor gets harder to turn when phases are connected. repeat this 3 times to check every ph...
by miuan
Jun 14 2017 6:50am
Forum: Items Wanted
Topic: Hayes 9in rotors or hope or bigger 10in
Replies: 3
Views: 382

Re: Hayes 9in rotors or hope or bigger 10in

I have been riding downhill bikes for many years with 8 inch rotors.
Some rotors warp easier than others. I've found that avid HS1 1-piece rotors with avid Code brakes didn't warp at all, while the shimano compound 2-piece rotors do it all the time.
by miuan
Jun 14 2017 6:23am
Forum: E-Bike Non-hub Motor Drives
Topic: Possible to make a trapezodial motor run on sinusodial cont?
Replies: 26
Views: 1744

Re: Possible to make a trapezodial motor run on sinusodial c

Have you checked if the hall sensors output proper signal? All 3 of them should alternate between zero and 5 volts as you slowly turn the rotor.
Also, does the motor turn freely? There can be a short in the phase wiring or windings.
by miuan
Jun 14 2017 6:11am
Forum: E-Bike Non-hub Motor Drives
Topic: Possible to make a trapezodial motor run on sinusodial cont?
Replies: 26
Views: 1744

Re: Possible to make a trapezodial motor run on sinusodial c

There is nothing trapezoidal inherent to a permanent magnet motor. In fact, any motor will run more efficiently on a sine wave. If your motor has 3 big phase wires and 3 hall sensors (5 small wires), then it can be run fine by the Sabvoton. I think yours is the case. If it only has 2 big wires then ...
by miuan
Jun 02 2017 6:45am
Forum: E-Bike General Discussion
Topic: Will my front fork setup hold or failure?
Replies: 20
Views: 1050

Re: Will my front fork setup hold or failure?

secure the torque arm on the right side by welding the two parts together.
this will prevent any rotation between them, which would render the whole torque arm useless.
by miuan
Jun 01 2017 9:38am
Forum: Battery Technology
Topic: Small pack (2p14s) build
Replies: 14
Views: 944

Re: Small pack (2p14s) build

I think you will be fine, but much depends on gearing, speed, riding style and weight. If your riding includes extended periods at full throttle, the cells may get hot at the end of the ride. What is your estimated average current draw and ride time?