Search found 186 matches

by tomtom50
Dec 07 2018 12:18am
Forum: E-Bike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 5943
Views: 497407

Re: New "TSDZ2 Torque Sensor Central Motor"

endlesscadence has asked me to write down some kind of "how to go about it". He meant to go over it and post it on the wiki, but i am afraid he is no longer active. at least i have not see him post here for 2 weeks or so. So therefore i am attaching what i have so far, there may be some mistakes in...
by tomtom50
Dec 05 2018 9:14pm
Forum: E-Bike Technical
Topic: Wattage vs Torque/Pulling Power.
Replies: 25
Views: 3789

Re: Wattage vs Torque/Pulling Power.

Or use the Grin Cycles simulator tool which can work out all this stuff for you ;) The Grin simulator has some drawbacks: 1. The Grin simulator graphs are not standard. Motor performance sheets graph motor data against torque. They start a motor at no-load and apply increasing torque. Here is an Ai...
by tomtom50
Dec 05 2018 8:54pm
Forum: E-Bike Technical
Topic: Wattage vs Torque/Pulling Power.
Replies: 25
Views: 3789

Re: Wattage vs Torque/Pulling Power.

So just to run an example against the desired speeds and grades, of the power required, even if friction and rolling resistance is zero: power = force x velocity In this case the force is gravity and the velocity is the vertical speed (opposite the force). If we consider 10% a steep grade, then for...
by tomtom50
Dec 03 2018 11:28pm
Forum: E-Bike Technical
Topic: Wattage vs Torque/Pulling Power.
Replies: 25
Views: 3789

Re: Wattage vs Torque/Pulling Power.

Want you are looking for is in one equation: Power = Force X Velocity. Power is watts. You need force to pull up a hill. If Velocity (speed) drops you can still climb that hill at low power. But you might climb slowly. Just like using lowest gear on your mountain bike. This is physics, there is no g...
by tomtom50
Nov 27 2018 9:52pm
Forum: Motor Technology
Topic: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 3695
Views: 252900

Re: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW

I bought this same controller from topbikekit. Have you used it yet? Any results? Did not touch the waterproof fill. Therefore, I use it in stock. Bike and I are about 100kg. Motor bafang BPM 10t 26 ". 48V. It starts moving away if the gas is lightly pressed, otherwise the current exceeds and switc...
by tomtom50
Nov 27 2018 2:23am
Forum: E-Bike Technical
Topic: Bafang G310 geared hub - 11:1 reduction ratio!!!
Replies: 154
Views: 21311

Re: Bafang G310 geared hub - 11:1 reduction ratio!!!

Adjusting wheel sizes to scale the motors to the same no load speeds Ah no, you can't do that for a fair comparison because you are then comparing the motors at different rpms and torques. The smaller wheel size almost always has the advantage since it needs to produce less torque for the same thru...
by tomtom50
Nov 26 2018 11:12pm
Forum: Motor Technology
Topic: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 3695
Views: 252900

Re: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW

Hi I got KT48SVPRM-XFCF06 (board KTE-9S5-J5). It has 9 transistors K150E09NE. Processor STM8S105C6T6. Current sensor acs711 (QFN). Is it compatible with this OpenSource firmware? kt48svprm.jpg What are the extra 3 transistors doing? I bought this same controller from topbikekit. Have you used it ye...
by tomtom50
Nov 26 2018 3:10pm
Forum: E-Bike General Discussion
Topic: Q128H Light & Torquey 800W Hub Motor
Replies: 21
Views: 2264

Re: Q128H Light & Torquey 800W Hub Motor

Good data right there. If you think about it, the G310 puts out roughly the same power than the Q128H, and is perhaps a hair larger, but it can only expend 132w continuously, and the Q128H is putting out >150W of heat at it's rated 800W. But this hill requires 1100-1200w to maintain any decent spee...
by tomtom50
Nov 26 2018 2:57pm
Forum: E-Bike General Discussion
Topic: Q128H Light & Torquey 800W Hub Motor
Replies: 21
Views: 2264

Re: Q128H Light & Torquey 800W Hub Motor

I think there is a 72 volt sine wave controller available but have not tried it. Thanks, that doesn't sound too bad. I read somewhere that the 72V KT controller is set up for 'normal' 24/36/48/60/72 voltages, and that if you connect a 52V pack it decides between 48V and 60V and sets voltage limits ...
by tomtom50
Nov 25 2018 10:33pm
Forum: E-Bike General Discussion
Topic: Q128H Light & Torquey 800W Hub Motor
Replies: 21
Views: 2264

Re: Q128H Light & Torquey 800W Hub Motor

I have a Surly Big Dummy cargo bike with Q128h 201 rpm motors front and rear. They are 48 volt motors run at 52 volts. It aint fast, tops out at ~19 mph but it can really climb hills. With both motors pulling it rarely gets below 13 mph on the steepest hills and pulls a fully loaded gross weight of...
by tomtom50
Nov 25 2018 10:27pm
Forum: E-Bike General Discussion
Topic: Q128H Light & Torquey 800W Hub Motor
Replies: 21
Views: 2264

Re: Q128H Light & Torquey 800W Hub Motor

Neptronix mentioned the Bafang G210 as another hub motor with similar power and weight. Unfortunately it is only available with windings too fast for climbing an 8% grade with a 700C wheel. (300rpm 36V / 400rpm 48V). They are really similar in construction and size G310Opened.jpg Q128C-135 & G31...
by tomtom50
Nov 25 2018 4:45pm
Forum: E-Bike General Discussion
Topic: Q128H Light & Torquey 800W Hub Motor
Replies: 21
Views: 2264

Servicing & Gear Reduction (48V 201rpm Q128H)

Nice CAD view CAD View.png The CAD view is current, everthing I saw inside matches. 1. To open unscrew the cover (freewheel side) from the hub body and lift out. I held the cover in a vise with aluminum jaw plates and turned the hub with a strap wrench. The hub cover with the free wheel threads is r...
by tomtom50
Nov 24 2018 1:16am
Forum: E-Bike General Discussion
Topic: Q128H Light & Torquey 800W Hub Motor
Replies: 21
Views: 2264

Re: Q128H Light & Torquey 800W Hub Motor

You can save yourself a lot of time and just do a proper search here. Just search the posts of either myself, D8veh or chas58 using the keyword Q128. Literally hundreds of posts like; https://endless-sphere.com/forums/viewtopic.php?f=3&t=83886&p=1235123&hilit=q128+D8veh#p1235123 https://endless-sph...
by tomtom50
Nov 23 2018 1:31pm
Forum: E-Bike General Discussion
Topic: Q128H Light & Torquey 800W Hub Motor
Replies: 21
Views: 2264

Q128H & Q100H are Aikema motors

In various posts it is not completely clear what company manufactures the Q100H & Q128H. It is possible in the past there were other manufacturers. Here is some solid evidence the current manufacturer is Aikema http://www.aikema.com.cn/En_Product.asp?EnBigClassName=ZYJZ-128F&EnSmallClassName=128SX%2...
by tomtom50
Nov 22 2018 5:48pm
Forum: E-Bike General Discussion
Topic: Q128H Light & Torquey 800W Hub Motor
Replies: 21
Views: 2264

Re: Q128H Light & Torquey 800W Hub Motor

I am sticking with rear hub motors because climbing a hill a front hub motors spins. That is a rather general statement, but yes, a frt. mount hub motor will spin given enough power, somewhere around 1500 Watts system power. But that is the range where other handling and safety issues arise. I had ...
by tomtom50
Nov 22 2018 4:54pm
Forum: E-Bike General Discussion
Topic: Q128H Light & Torquey 800W Hub Motor
Replies: 21
Views: 2264

Re: Q128H Light & Torquey 800W Hub Motor

Yikes. The motor is current limited and out of it's efficiency window in both situations. Bump the controller up to 40A to see what it's really going to try to pull. A slower winding would be ideal. The 700c wheel isn't helping either. If you have to take hills like that, it may very well melt the ...
by tomtom50
Nov 22 2018 2:47pm
Forum: E-Bike General Discussion
Topic: Q128H Light & Torquey 800W Hub Motor
Replies: 21
Views: 2264

Re: Q128H Light & Torquey 800W Hub Motor

Nice thread, but you missed the Bafang g310, which is rated 500W but realistically can do 700w continuous for a long period of time and only weighs 5.6lbs and has very low freewheeling drag and high efficiency.. ( peaks in the 85% range ) Thanks! I saw the G310 at ebike.ca https://www.ebikes.ca/sho...
by tomtom50
Nov 22 2018 2:02pm
Forum: E-Bike General Discussion
Topic: Q128H Light & Torquey 800W Hub Motor
Replies: 21
Views: 2264

Q128H Motor Curves

Ahh, motor curves. As an engineer I love them, but I recognize they are forbidding unless well explained, and is the data reliable. The only Q128H motor curve data I found was in a Pedelec.uk forum: q128h pedelecs uk.jpg http://www.pedelecs.co.uk/forum/threads/q128h.20980/ (good thread, BTW) (D8VEH,...
by tomtom50
Nov 22 2018 1:29pm
Forum: E-Bike General Discussion
Topic: Q128H Light & Torquey 800W Hub Motor
Replies: 21
Views: 2264

Q128H Dimensions

Before I bought I could not find solid or consistent dimensions for the 135mm axle Q128H. But now I have it and have measured it directly, so here are good numbers to calculate spoke length:
Q128H measured 2.png
by tomtom50
Nov 22 2018 1:24pm
Forum: E-Bike General Discussion
Topic: Q128H Light & Torquey 800W Hub Motor
Replies: 21
Views: 2264

Q128H Light & Torquey 800W Hub Motor

After a long search for hub motors that are light, good for climbing hills, freewheel easily, and inconspicuous, three stood out: Q100H (Aikema, sold by BMS Battery & topbikekit) Q128H (Aikema, sold by BMS Battery & topbikekit if you ask) Xiongda XD 2-speed (sold by manufacturer and Luna) As with so...
by tomtom50
Nov 22 2018 12:10am
Forum: Motor Technology
Topic: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 3695
Views: 252900

Re: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW

Wow, this thing really has a STM8 on it and also a flash connector. Thats actually a very good alternative to the bulky Controllers that need an extra bag. Cooling should be decent as well as the airflow directly hits the underside. If this can output ~20A over a longer period of time without blowi...
by tomtom50
Nov 20 2018 12:06pm
Forum: Motor Technology
Topic: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 3695
Views: 252900

Re: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW

With a flashlight and just the right angle I can read the IC tags. Let me know if you want me to take another look. I'm not an EE or electronics tech so I don't know that well what to look for. KTE-9S5-J5 ANNOTATED.jpg I'm interested in your thoughts. Do you know the function of the 78MOS or the 14-...
by tomtom50
Nov 20 2018 1:19am
Forum: Motor Technology
Topic: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 3695
Views: 252900

Re: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW

Integrated 9 mosfet KT sine controller. I bought it from topbikekit.com http://www.topbikekit.com/kt-36v48v-9mosfets-sine-wave-controller-for-big-hailong-case-65pcs-cells-p-712.html They said it was for big Hailong case 65 cells, I took a risk, bought it, and it perfectly fits the 52 cell Hailong ca...
by tomtom50
Nov 15 2018 11:40pm
Forum: Battery Technology
Topic: 48V / 52V Dual-use battery pack feasible?
Replies: 9
Views: 519

Re: 48V / 52V Dual-use battery pack feasible?

I use a 14 S pack with a pair of q128 motors and S12sh controllers w/ L CD 5 meters. The motors shut down a few times on full charge but since I use throttle only it is just a matter of releasing the throttle then re-engaging to get the power back. This may sound like a pain in the ass , but it rea...