Search found 40 matches

by jordanjozsef
Mar 01 2020 10:37am
Forum: E-Bike Technical
Topic: Hub motor high no load resistance
Replies: 7
Views: 515

Re: Hub motor high no load resistance

It sounds quiet when it gets up to speed, I think it's the thick magnets that makes it more noisy at low RPM. At higher RPMs it's so quiet. I'll see how it will perform under load, but I think it will have lot of torque.
by jordanjozsef
Mar 01 2020 7:35am
Forum: E-Bike Technical
Topic: Hub motor high no load resistance
Replies: 7
Views: 515

Re: Hub motor high no load resistance

5A at full throttle from 60V, which I thought is much, but my other motor draws 3-4 amps from 36V, so it's not much higher. As you can hear the video, it resonates much at low rpm, so the scooter won't be suitable for low speed riding. https://youtu.be/WtBzjTKIiNY I don't have a battery yet, but the...
by jordanjozsef
Feb 27 2020 2:09pm
Forum: E-Bike Technical
Topic: Hub motor high no load resistance
Replies: 7
Views: 515

Re: Hub motor high no load resistance

I'll check the current draw at different speeds and then I compare my other hub motor to see if it's a phase short or it's because of the design. The bearings are new too, but it was the same with the old bearings.
by jordanjozsef
Feb 26 2020 1:34pm
Forum: E-Bike Technical
Topic: Hub motor high no load resistance
Replies: 7
Views: 515

Hub motor high no load resistance

I've got an electric scooter hub motor (48V 1500W), which is new for me, because I have 3 hub motors and I've seen much more motors, but the usual scheme is when I spin the wheel with my hand it's easy and it gives a whinning noise which will go away as the wheel slows down. But this beast motor jus...
by jordanjozsef
Feb 19 2020 3:46am
Forum: Battery Technology
Topic: BMS wired for charging only
Replies: 22
Views: 4800

Re: BMS wired for charging only

I'm thinking on the same, I don't want to purchase a 100A BMS, so bypassing the 60A BMS and setting the controller's low voltage limit is the way to go. Plus I'll add fuses and a circuit breaker. A good pack shouldn't have imbalanced cell pairs, SLA battery packs doesn't have a BMS either, but I'm u...
by jordanjozsef
Feb 04 2020 9:01am
Forum: E-Bike Technical
Topic: Hub motor high frequency noise
Replies: 12
Views: 1077

Re: Hub motor high frequency noise

Now I see why it's so noisy, I opened up a quiet motor, it's 14 years old, but still works well, and now I see the difference. The windings are well tightened down with some rope and I think it's also coated with some lacquer, so it has no chance to vibrate. Also the stator looks "twisted" which is ...
by jordanjozsef
Feb 01 2020 2:15pm
Forum: E-Bike Technical
Topic: Hub motor high frequency noise
Replies: 12
Views: 1077

Re: Hub motor high frequency noise

I injected Statorade when I bought the motor, maybe that's the problem? BTW I just tried an e scooter motor with the same controller and voltage, and has no loud noise, so that motor is faulty.
by jordanjozsef
Jan 31 2020 2:22am
Forum: E-Bike Technical
Topic: Hub motor high frequency noise
Replies: 12
Views: 1077

Re: Hub motor high frequency noise

The covers of the hub motor are flat, so I think there isn't much clearance, that could be a problem, but if I could make a thick aluminium plate and screw it on the cover, it would decrease the resosnance, right? The loose winding would cause the noise, however I can't do anything against that. Onl...
by jordanjozsef
Jan 31 2020 12:35am
Forum: E-Bike Technical
Topic: Hub motor high frequency noise
Replies: 12
Views: 1077

Re: Hub motor high frequency noise

I hope that you can check out the video soon. The stator is 45 mm wide, so it could be a 3 kW rated motor. I have to mention that I'm driving the motor from 120V, so that could make more noise at low RPM, because high voltage is very inefficient at low RPM. It's not that loud at higher RPM, but I al...
by jordanjozsef
Jan 29 2020 12:10am
Forum: E-Bike Technical
Topic: Hub motor high frequency noise
Replies: 12
Views: 1077

Re: Hub motor high frequency noise

https://www.youtube.com/watch?v=PuCyktZXXQM
I just took another video, showing that it's that loud.
I tried all 36 phase - hall combinations, there were 3 correct, but all of them gave me this performance.
by jordanjozsef
Jan 20 2020 2:21pm
Forum: E-Bike Technical
Topic: 20kw controller for vortex vector
Replies: 4
Views: 860

Re: 20kw controller for vortex vector

I'm using a 120V 80A Yuyangking controller, but they sell 120V 150A too, you don't need much battery amps if you use high voltage, what's more difficult is to find BMS and charger, that's why I'm using two 14s10p pack in series.
by jordanjozsef
Jan 20 2020 2:12pm
Forum: E-Bike Technical
Topic: Motor Wire Gauge VS Power
Replies: 12
Views: 2035

Re: Motor Wire Gauge VS Power

Thicker wires have less resistance, so they can transfer more power without heating up. Heat = wasted energy. In theory thicker wires would give you more power, because less heat was created so you have more power to make the wheel accelerate. But soldering and connecting points increase resistance,...
by jordanjozsef
Jan 19 2020 4:51pm
Forum: E-Bike Technical
Topic: Hub motor high frequency noise
Replies: 12
Views: 1077

Hub motor high frequency noise

https://www.youtube.com/watch?v=TUgNQ72AzVk I've purchased a new hub motor, but ever since I have it, it always makes a high frequency noise and it's louder than usual. I also found out it eats much more amps that it should, however it feels powerful and it's not resonating. At 50 km/h the motor dra...
by jordanjozsef
Oct 15 2019 4:20am
Forum: E-Bike Technical
Topic: Newb Controller & FET controller upgrade question
Replies: 12
Views: 3851

Re: Newb Controller & FET controller upgrade question

You will also need to be pushing higher amps at higher voltage to maintain the higher speed. That is not true. The higher the voltage, the less amps you need for the same speed. I'm using a 117V battery pack with only 54A controller, but I can reach 90 km/h, and it could still go faster, I just nee...
by jordanjozsef
Aug 28 2019 3:32pm
Forum: E-Bike General Discussion
Topic: Hacking Controller LVC
Replies: 5
Views: 1148

Re: Hacking Controller LVC

What about the EBS 7.5 k Ohm resistor? I found mine, but I don't know what happens if I change the value of it. My regen's highest voltage is 90V and I want to change it to 120V, because it does nothing when I connect my high voltage battery, but it works well with 72V, when no battery connected, an...
by jordanjozsef
Aug 06 2019 9:38am
Forum: E-Bike Technical
Topic: Motor Controller, why not bigger? 12 Fet vs 18 Fet
Replies: 25
Views: 6561

Re: Motor Controller, why not bigger? 12 Fet vs 18 Fet

Well, I put a third shunt meanwhile and I'm using it like that for a few months with an extra heat sink and fan, because it can get hot during a full throttle acceleration. It draws 54A, and it works well, I just need to improve the cooling system. I want to remove the ribs on the controller's box, ...
by jordanjozsef
Jul 19 2019 12:12am
Forum: E-Bike Technical
Topic: Higher regen voltage than battery voltage
Replies: 7
Views: 1301

Re: Higher regen voltage than battery voltage

My controller has regen, however the seller said it doesn't have, but I enabled it, the controller's low voltage cutoff is at 58V, it's marked as a 108V controller anyway and my fully charged battery is around 115V. The problem is that the regen doesn't work at that voltage. It works well with a 72V...
by jordanjozsef
May 23 2019 2:35am
Forum: E-Bike Technical
Topic: Motor Controller, why not bigger? 12 Fet vs 18 Fet
Replies: 25
Views: 6561

Re: Motor Controller, why not bigger? 12 Fet vs 18 Fet

Then you have about 4300w of power out from the controller already. You know, people always want more, and since I'm in between the safe limits, why not? I guess my 3000W hub motor could handle 6000W bursts without problem, because my 300W hub motor handled the 4300W too. Me with the bike weights a...
by jordanjozsef
May 23 2019 2:03am
Forum: E-Bike Technical
Topic: Modifying a shunt with controlled results
Replies: 58
Views: 20615

Re: Modifying a shunt with controlled results

I guess mine just simply decrease the RPM to the given throttle position. I see that it couldn't work for anyone and I'm lucky it works this way on my controller, so I don't have to do more complicated things. Now the other things I'm interested about is when I do the shunt mod, if it affects the ac...
by jordanjozsef
May 23 2019 1:19am
Forum: E-Bike Technical
Topic: Modifying a shunt with controlled results
Replies: 58
Views: 20615

Re: Modifying a shunt with controlled results

I don't have Cycle Analyst, but I had to mention that I was working on how to limit the speed with a potentiometer connected between the throttle and the controller and it worked well, but looks like there's a limit that the controller can't see, so I wasn't able to get lower RPM, it just decreased ...
by jordanjozsef
May 22 2019 2:21pm
Forum: E-Bike Technical
Topic: Modifying a shunt with controlled results
Replies: 58
Views: 20615

Re: Modifying a shunt with controlled results

Don't think that works, because if I gently pull the throttle, nothing - nothing - nothing, then bam it pushes like crazy. I also noticed when I pull the throttle, the wheel doesn't want to spin, I have to twist more to make it spin, then while it's spinning, if I slowly release the throttle the RPM...
by jordanjozsef
May 22 2019 6:56am
Forum: E-Bike Technical
Topic: Motor Controller, why not bigger? 12 Fet vs 18 Fet
Replies: 25
Views: 6561

Re: Motor Controller, why not bigger? 12 Fet vs 18 Fet

I have a 18 FET controller with IRFB4110 FETs and the current limit is 42A, which is not much. I have a 3000W rated hub motor, and 108V nominal voltage. The power output is easy on the motor, and the controller has only 2 shunts but there's a place for a third, so I guess it could easily handle the ...
by jordanjozsef
May 19 2019 1:03pm
Forum: E-Bike Technical
Topic: Modifying a shunt with controlled results
Replies: 58
Views: 20615

Re: Modifying a shunt with controlled results

I want to have torque while I'm accelerating, but not from standstill. I had a 72V controller which had a "soft start" function, it did exactly what I want now. It was annoying with lower voltage, because it took so much time to speed up, but now it could work well. And I want to switch it, because ...
by jordanjozsef
May 11 2019 12:06am
Forum: E-Bike Technical
Topic: Modifying a shunt with controlled results
Replies: 58
Views: 20615

Re: Modifying a shunt with controlled results

It's not programmable, but it has a three speed switch. Well it's a "limited" controller, the voltage range varies from 58v to 120v. The seller said it has no regen, but I enabled it on the pcb, but it's max regen voltage is 90v, so I can't use it, I also was able to limit the max rpm, but the my ha...
by jordanjozsef
May 10 2019 4:11pm
Forum: E-Bike Technical
Topic: Modifying a shunt with controlled results
Replies: 58
Views: 20615

Re: Modifying a shunt with controlled results

I just tried out my 3 kW high speed hub motor in a 20" rim, and it's ridiculously powerful from dead stop. I can't accelerate lightly, it immideately lifts the front wheel if I don't lean on, and it's impossible to twist the throttle when turning and going slow, because it's just way too powerful. I...