Category Archives: hub motor - Page 15

suddenly hub motor stops and the light on the trottle goes off

Posted by on March 8, 2025 Comments Off on suddenly hub motor stops and the light on the trottle goes off

I have a question about hub motor system.
Q:When I connected the last hub motor kit bought from ebay this happen:
On with key wit my 48v lithium battery – all 3 light comes on in throttle.
I twist the throttle slowly hub motor start to spin and I twist the throttle more (under half speed of full speed – the wheel is spinning free no resistance – Battery is fully charged. And suddenly hub motor stops and the light on the throttle goes off.
If I take off the power with key and on again then the light comes back on the throttle.
I also try a another throttle with no difference.
How could this problem be solved ?
A:I think the problem is from your battery.Some cells inside your lithium battery are broken.Though you full charged your battery,it also can drive hub motor system when output less current(less than half speed).If twist more,need to output larger current,some broken cells will be used out energy earlier than good cells.At this time,in order to protect all cells,your BMS inside lithium battery will stop output.Therefore hub motor stopped.
When you re-start,hub motor kit still can work at less speed.

Do you have volt-meter,you can test your hub motor system as below:
1.Make your hub motor wheel in the air;
2.Power on and measure the voltage from positive and cathode of your battery;
3.Read data,maybe 42V(full charged 36V battery);
4.Twist less,run slowly;
5.Read data,maybe 41V,no any problem,three led on throttle still work;
6.Twist more,hub motor stopped;
You will find the voltage dropped less than 34V when you twist more and hub motor stopped.
But when your loose throttle,the voltage will be back 42V.So when you turn on your key,three leds be on and hub motor works.

In order to make your hub motor works normal.You should replace cells.

hub motor shook when powered on

Posted by on March 8, 2025 Comments Off on hub motor shook when powered on

Q:Help me! my ebike don’t work. Then I turn on the key on the battery the 3 lights on the thumb throttle starts to light. then I press the thumb throttle the motor shake with some noise 1 second and doesn’t work.

Answer 1:Check wires.Most of problems come from wrong connecting.

Answer 2:Exchange motor wire connecting.Please connect as below picture,thanks.

Answer 3:Don’t worry.My 700c 48v1000w electric bike kit also had this problem.Please exchange yellow and green wires.
Controller ———— Motor
Thick Yellow —– Thick Green
Thick Green —– Thick Yellow
Thick Blue —– Thick Blue

Thin Yellow —– Thin Green
Thin Green —– Thin Yellow
Thin Blue —– Thin Blue
Thin Red —– Thin Red
Thin Black —– Thin Black

Answer 4:My 36V 250W 26″ kit also exchanged these two wires.

Answer 5:No exchange thin red and thin black wires,just exchange three thick yellow,blue,green and three thin yellow,blue,green wires. Exchange 12 times,must find one kind of right phase and system can work normal.

Answer 6:Had better to connect wires as instruction,sometime connect wrong wire will break controller.Even if done wire connecting,still need to re-check connecting.At last put on battery.

Answer 7:Don’t worry,your hub motor can shake that means motor and controller are both okay,please exchange wires according as the instruction of drawing that will solve it.

Answer 8:Hello,holmqvist,how is your e-bike? Still shake…

BEST ANSWER:The third answer.

more detail about hub motor

Posted by on March 8, 2025 Comments Off on more detail about hub motor

These days more and more hub motors are used for ebikes.We also call them electric bike motors.For e bike motor,it’s an important key product.It seems bike engine.

We know gasoline engine.The internal combustion engine is an engine in which the combustion of a fuel (normally a fossil fuel) occurs with an oxidizer (usually air) in a combustion chamber. In an internal combustion engine, the expansion of the high-temperature and high -pressure gases produced by combustion apply direct force to some component of the engine. This force is applied typically to pistons, turbine blades, or a nozzle. This force moves the component over a distance, transforming chemical energy into useful mechanical energy.

Gasoline engine will let co2, so2 pollute environment and be bad for health.

For electric bike motor,it uses battery,one kind of clean energy.
Hub motor is make up of rotor winding,magnet,hub,axis,bearing,hall sensor…

Hub motor electromagnetic fields are supplied to the stationary windings of the motor. The outer part of the motor follows, or tries to follow, those fields, turning the attached wheel.

About motor speed,power..we can customize it according as customers’ actual need by change gauge of the coil wires and/or the turns number of the coils and/or the height of magnet

There are some parts of hub motor.

Convert your ordinary bikes to electric bikes

Posted by on March 8, 2025 Comments Off on Convert your ordinary bikes to electric bikes

Riding an electric bike is a green form of transportation,no gasoline and exercising yourself.You can customize your own electric bicycle with e bike kit,and this bike DIY can be done at home with fun.

Bike conversion kit usually includes an electric bike motor,a motor controller,throttle and brake lever,battery and charger is optional.The most popular electric bike kit package consists of 250 and 750 watts electric hub motor,36 volt 10 amp-hour lithium LiFePO4 battery,and 2-amp charger.

Electric vehicle conversion is gaining more popularity in Euro-American countries for its affordable price and wonderful experience.An converted e bike can travel up to 15 to 20 miles per hour.
12″ 14″ 16″ 18″ 20″ 24″ 26″ 700c” 28″ bike kit

Customize your electric bike conversion kit
1. Mini bike hub motors(24V 250W – 36V 250W)are fit for France,Netherlands,Norway…Europe market
Motor:brushless gear dc hub motor – BIG TORQUE
Speed:15miles/hour with PAS should work with brushless motor controller
Bicycle Rim: 6″ 8″ 10″ 12″ 14″ 16″ 18″ inch casting bike hub wheel
—–20″ 24″ 26″ 700c” 28″ inch bike wheel rim
2. HBL- spoke brushless hub motors(36V 750W – 48V 1000W) are fit for USA,Canada…North America market
Motor:brushless gearless dc hub motor – LOW NOISE
Speed:20miles/hour
Bike Rim:12″ 14″ 16″ 18″ 20 inch casted hub bike kit
—–20″ 24″ 26″ 27.5″ 700c 27″ 28″ 29 inch bicycle rim

More info about 12″ 14″ 16″ 18″ 20 inch casted hub and 20″ 24″ 26″ 27.5″ 700c 27″ 28″ & 29″ inch aluminium bicycle wheel rim,see below picture:

More info about 14″ 16″ 18″ 20 inch casted hub motor.After ride e-bike for a couple weeks,you should tight spokes,it’s an unhappy thing.
Now casted electric motor wheels never get trouble with spokes.

Convert your ordinary bicycles to professional ebicycles YOURSELF!

Posted by on March 8, 2025 Comments Off on Convert your ordinary bicycles to professional ebicycles YOURSELF!

No Traffic Jam, No Pollution, No Gasline! Fun & Healthier Lifestyle!
20″ folding electric bicycle= top quality bicycle engine kit + common folding bicycle
1.Speed: 15mph with pedaling
2.Travel Range: 30 miles per charge
3.Electric bike battery: 36V16AH, 12.2Lb Lithium battery — safe and lightest EV battery
4.Electric bike motor: 36V750W — quiet and powerful
5.Brushless controller — Cruise Speed Control — Make your ride more relax and fun
6.Regenerative braking — Energy saving,safe and smooth stopping experience
7.Anti-theft alarm — Protect your loved ebike from being stolen
8.Aluminium reinforced frame — light and strong
9.Weight: 50Lb only with electric bicycle battery

BLDC motor,Solid casting hub motor made in China
250W 500W 750W 1000W bike motor kit 12″ 14″ 16″ 18″ 20″ 24″ 26″ 700c” 28″
Three kinds of hub motors are used to install on electric bicycles, electric tricycles, electric scooters.
Front motors are fit for standard 100 mm front forks and rear motors are fit for standard 135 mm rear forks.
Size: 12″ 14″ 16″ 18″ 20″ 24″ 26″ 700c” 28″inch casted wheel
Voltage:24V/36V/48V DC
Output Power:250W/500W750W/1000W

Safe,long-life.. EV battery for electric bicycle
Lithium-ion battery is a kind of rechargeable battery.It’s much lighter,no memory effect…Leaf Motor offers 24V 10Ah,36V 10Ah,48V 20Ah,48V 30Ah LiFePo4 batteries and 24V 10Ah,24V 16Ah,36V 12Ah,36V 16Ah,48V 20Ah LiMn2O4 batteries,electric scooter battery,motorcycle battery pack.Please follow us to look for more Li-ion batteries.

need user manual for 700c 250w electric bike kit

Posted by on March 8, 2025 Comments Off on need user manual for 700c 250w electric bike kit

Q:Ordered 1 set of bike conversion kit from leafmotor couple days ago.
Waited for nearly 7 days,picked up box in local post office.
Disconnect this package,everything is nice,especially LCD display,as said,it can display speed,mileage,battery gauge..
Happy to done conversion,spend half a day.Hub motor works well.But can’t find any data display on this LCD, I don’t know how to set this LCD.

Need a user’s manual for set LCD, urgently!!!

Answer 1:
It’s very hard to find this manual on leafmotor’s website.
Please links below address to download this file.

Answer 2:
Thank you,Joe Please free to ask us,if need Tech problem.

This Bike Conversion Kit Item:
Product list as below:
1.700c double aluminium rim front wheel with 36V 250W brushless geared hub motor;
2.36V 250W brushless controller with LCD display(display speed,mileage,battery gauge)
3.thumb throttle OR twist throttle(optional)
4.brake lever with low voltage brake
5.three-button switches(It’s a ON/OFF switch used for control your front&rear lights,cruise,horn..)
6.Pedal Assist(PAS is used for European countries)

Note:About 5 years ago,most of this 250w mini motor is brushless gearless,but it has low torque of disadvantage.Now in market,use this kind of brushless geared motor to replace it.

This motor is still brushless sensor motor,but inside motor,a gear box more. Please review pictures.

The speed of this 700c electric bike kit is a little fast than 26″ bike kit.Because 700c is a little bigger than 26″ rim.

Our standard 250w electric bike conversion kit
Speed:15miles/hour
Power:250W
It’s fit for European cycling law.
Sure,if need high speed or low speed e bike kit,we can customize as your need.

Answer 3:
More information about this 36V 250W brushless geared motor
The structure of inside,picture enclosed.

The best answer:the second answer

26 inch 36V 250W rear hub motor electric bike kit

Posted by on February 22, 2025 Comments Off on 26 inch 36V 250W rear hub motor electric bike kit

Q:Does Item Number:LBCK263250R hub motor kit have throttle only option? Also does it have motor cutoff brake sensors?

A:This Item hub motor kit works with throttle or pedal assist or both of them.
Come with brake lever with cut off function. But not come with cut off brake sensors.
We have brake sensors on our site.
https://www.leafbike.com/products/electric-bike-parts/hydraulic-mechanical-brake-cut-off-sensor-switch-cable-1213.html

Q:What’s the difference with brake levers with cut off function verse brake cut off sensor?

A:The same.
If you don’t use our brake lever, prefer yourself brake lever, can install this cut off sensor.
If use our brake lever, don’t use this cut off sensor.

Q:Okay.I understood thank you
I’m thinking about the rear 250w hub motor or the rear 350w hub motor.
I like the smaller display that the 250 has. If I get the 350 watt bike motor kit can I ask for the smaller display that comes with the 250?
Also I have a 7 speed cassette will both these motors work?

A:Yes. We have smaller LCD that can work this 250w or 350w controller.For example: LCD-07U, LCD-005 or LCD-004
Can make cassette version motor. But, should tell us after paid. (Default: fit for 7 speed freewheel sprocket)

Q:Can you help me further?
I have a Electra townie bike.
The tires are 26 inch with cruiser size tires(not fat tire) but they are the 2.125 size. My bike also has linear pull brakes, not disc brakes.
The 350 and 250 watt hub motors all sit tires sizes too small and I don’t see any that accept rim brakes
I want to add a 250 or 350 watt rear hub motor to this bike.

A:When you order, leave message: 26 x 2.125 tire.
Then we use the other 26 inch rim
https://www.leafbike.com/products/electric-bike-parts/26-inch-e-bike-rim-1094.html
All of our rims can accept rim brakes.

Q:What I am clear on is that you have bike motor kits for rim brakes. You have kits for my tire size. Thank you for answering those. I do have free wheel and its shifted with a 7 speed cassette

My remaining questions are:
1. I need a freewheel with a seven speed or a freewheel that can accept my cogs.from my existing wheel. Do I just state this in the comments?
2. I am trying to decide between the 350w and 250w rear bike motor kit. LBCK2636350RG and LBCK2636250R.
3. Does the 250w hub motor kit also have pedal assist?
4. Does the 250w hub motor kit also have the cruise control feature?
5. Do they use the same controller?
6. I like the display on the 250w bike motor kit. If I get that with the 350w bike motor kit will i lose any features?
7. Can i have a thumb throttle instead of the twist throttle?

A:1. This hub motor kit can work with standard size 7 speed freewheel or 1 speed cog.
3. both have pedal assist function
4. both have cruise control
5. Different controller
6. 350w also have that display. (Just tell us what kind of LCD)
7. Yes, can use thumb throttle. We can ship thumb throttle.

The hub motor works very well but with E7

Posted by on September 19, 2024 Comments Off on The hub motor works very well but with E7

Q: I connected hub motor to the controller and everything up correctly and the display powers on perfectly well but when I turn the throttle on nothing happens with bike motor. Is there a necessary configuration?

A: First connect hub motor.Controller will check Hall sensor.Display E7. If connect wires well. E7 will be off. If always display E7. Bike motor works in no Hall status. Just check White big plug with red,black,green,blue,yellow..(Hub MOTOR SENSOR PLUG)If one wire is not connected well.Always display E7. Check if pin inside white big plug was bent?

Q: I checked the pins in that sensor plug, they all seem to be perfectly fine. The hub motor has not worked since I got it even if the hall plug is unplugged. Is there a change in settings for sensor less?

A: There are two brown wires from controller. Remove black tape on two brown wires. Don’t turn throttle. Plug these connectors together. Controller can look for correct working way. .Plug them.If bike motor Not work，Disconnect them.Then re-plug until work correctly.Then disconnect them.Turn throttle

Q: Cool I will try, should I turn the bike off before I connect the wires or should I do this while it is on? Will connecting those wires spin the motor?

A: If plug these two connectors,also can’t solve it. Controller always remembers this E7 is correct working way. Do it as below: 1.Disconnect/remove your battery power plug 2.controller’ red and black wires touch together for 1 second.Let controller to be default Then re-connect your battery to controller.(If wires are connected well).Must solve it.

Q: When I connected the pedal assist it works perfectly, so it must be the throttle, could you verify for me that this is the correct wire orientation?

BMX 20 inch 48V 52V 1500W rear hub motor electric bike wheel

Posted by on September 6, 2024 Comments Off on BMX 20 inch 48V 52V 1500W rear hub motor electric bike wheel

Q: Please send me a quote for this 20 inch 48V 52V 1500 Watt rear hub motor laced to a 20 inch double wall rim with 1.75 inch tyre.
few questions:
-what is the overall diameter ( mm ) of the 20 inch rim with 1.75 inch tyre ?
-what is the dropout distance of the axle ( mm ) ?
-please send me a schematic wiring diagram of the cable wires.
-estimated delivery by standard sea freight to Sydney, Australia.
-estimated delivery time ( weeks ).

A: This 20 inch BMX rear bike motor is fit for about 110mm rear dropout. (The dia. of shaft is 14mm, 14mm screw nuts, flat is 10mm that fit for 10mm)
Please click below site.
https://www.leafbike.com/products/e-bike-hub-motor/bmx-20-inch-48v-52v-1500w-rear-hub-motor-electric-bike-wheel-1264.html
If your tire is 20 x 1.75. When you order, tire size,choose: 20 x 1.5″ / 1.75″ / 1.95″
Total size of 20 inch rim is 420mm (about 16.5″)
There is one cable from motor with 3 heavy green,blue,yellow wires and 5 thin red,black,green,blue,yellow wires.
It takes about 10 days to deliver in Sydney, Australia.

Q: yes I think the Power Circle 20 inch rim with 1.75 inch tyre will suit my e-scooter rear frame.
My rear frame dropout is 135 mm, can you replace the 110 mm axle dropout with a 135 mm axle dropout.

The hub motor looks like it has a lot of torque (N. m), do you have torque arms that can fit on each side of the axle flats.
This will allow me to fix the torque arms to my rear frame to stop the axle spinning backwards under hard acceleration.

Do you have a wiring schematic for all the wires coming out of the hub motor so I can check which wires needs to connect to my Controller.
Is there a wire for the thermistor for the hub motor temperature sensor.

A: please click below site.This motor is 135mm dropout.
https://www.leafbike.com/products/e-bike-hub-motor/20-inch-48v-52v-1500w-rear-bike-motor-wheel-1016.html
We don’t have torque arm now.
We have NTC-10K and KTY84-130 two kinds of temp.Can choose one of them install into motor.Will come out a white wire.

Q: What is the temperature of the two types of wire… Which one is suitable for the hub motor?

A: Maybe your display can choose set and choose any one of them. Default: KTY84-130 (Most customers use this temp)
But, also other customers asked us to install NTC-10K inside motor.

bike hub motor speed

Posted by on January 29, 2024 Comments Off on bike hub motor speed

Q:Just a quick question. What is the tooth count on the freewheel sprocket?
A:16T or 18T
Q:Do you know which one? I may want to change it to a different tooth count.
A:Please click below site. This kind of single cog. (If you told us before shipment. We can put this one in parcel for free.
Q:I still wasn’t sure what front chain wheel to rear cog combination would work best with this motor. I can get the cogs here easily.The hub motor arrives today. Well done as always! Hey, I need the Kv for the motor in RPM/V and the number of pole pairs for my controller.
A:about 19 rpm/ V, 46 pcs magnets (23 pair)
Q: I am finally setting up the new bike motor. I assume the 750w is a 48v based version so the rpm if we use the provided figure kV figure of 19 rpm/V is around 912 rpm. Am I correct?And what is the max phase current on the motor?
A:We didn’t test this hub motor on machine. We worry load it that will break this bike motor.
So don’t know max current.
max phase current is about = 1/3 of max current.
Q:Thank you for explaining max phase current but can you approximate what your other similar hub motors had for a max current and then I can approximate from there. I need it to complete setting up the controller.
For example, what is the 4T 750w 48v max current or what is the 1000w 48v 4T max current, etc. From there we can get pretty close to what it is.
I am doing lots of diagnostics and see that my bike motor is maxing out at around 731 rpm. Why am I not getting 912 rpm?I am getting a max rpm of 763. I am using a 52v battery.
A:For example: 1500w 4T no load speed is about 610rpm @48v works with square controller
1000w 4T no load speed is about 720rpm @48v works with square controller
I think your 4T hub motor max about 830rpm no load speed works with square controller
If works with sine wave controller, 10% slower than square controller, about 747rpm no load speed.