Author Archives: leafmotor - Page 29

The basic principles of the permanent magnet hub motor

Posted by on March 12, 2025 Comments Off on The basic principles of the permanent magnet hub motor

We talk about one type of permanent magnet hub motor for electric bike. It’s a hub electric bike motor, sometimes we also call it brushless dc hub motor .

The permanent magnet hub motor and the hub motor driver is a typical product for e-bike recently.

Generally the electric bike motor ’s rotor winding is made of a three phase star connection, with the three-phase asynchronous AC hub motor is very similar. The hub motor rotor has been magnetized permanent magnet, in order to detect the polarity of the hub motor, there are three halls sensors on the rotor.

The hub motor driver is made by the power electronic devices and integrated circuits, its function is to receive electric bike motor ’s start, stop and brake signal so that control the hub motor to start, stop and brake; receive the position sensor signals and reversing signal, used to control the inverse power tube change the bridge off to produce a continuous torque; receive the speed command and speed feedback signal used to control and adjust the speed; provide protection and display

The main circuit is a typical voltage-type AC – DC – AC circuit, other pieces of alternating square wave frequency of 5-26KHZ modulation wave symmetry.

Permanent magnet NS alternating exchange, the position sensor phase difference of 120 ° U, V, W, square wave, combined with the six-state encoding signal forward / reverse signal generator: 101,100,110,010,011,001, through processing logic components to produce conduction of T1-T4, T1-T6 turns on, the T3-T6 conduction, T3-T2 turn-on, turn-T5-T2, T5,-T4 conduction, which means that the DC bus voltage is incremented A + B-, A + C-, B + C-, B + A-, C + A-, C + B-, so that the rotor turned a pair of NS pole, T1-T6 power tube fixed into six states followed by conduction. Each state, only two phase winding are energized in order to change a state, the axis of the magnetic field generated by the rotor winding 60 ° electrical angle of rotation in space, the rotor follows the rotor magnetic field rotation is equivalent to the space of 60 ° electrical angle position, the rotor in a new location so the position sensor U, V, W to produce a new set of coding according to the agreement, the new coding and changed the power tube combination of conduction, the magnetic field generated by the rotor winding shaft forward 60 ° electrical angle, and so on, permanent magnet electric bike motor produces continuous torque, drag the load for a continuous rotation. Permanent magnet DC motor commutation is itself, rather than forced by the commutation, also known as controlled synchronous hub motor.

Hub motor, electric bike motor supplier: Leaf Motor Technology Co.,Ltd

bldc motor interaction principle

Posted by on March 12, 2025 Comments Off on bldc motor interaction principle

Based on the principle of rotation of the motor for the Fleming left hand rule, when a wire placed in a magnetic field, if the current through the wire, the wire will cut the wires generate the magnetic field lines move. Current into the coil creates a magnetic field using the current magnetic effect, the solenoid magnet at a fixed continuously rotating device that can convert electrical energy into mechanical energy. And a permanent magnet or by another group of the magnetic field generated by the coil to generate power bldc motor interaction principle is the stator does not move, the force generated by interaction of the rotor according to the direction of movement. bldc motor controller is on the alternating current through the stator windings, a rotating magnetic field, rotating magnetic field attracts the rotor rotates bldc motor with the basic structure include “armature”, “field magnet,” “slip ring”, “brush” . Armature: You can rotate around the axis of the soft iron core wound multi-turn coil. Field magnet: the strong magnetic field of permanent magnet or an electromagnet. Collector ring: coil about two to two semi-circular termination of slip ring, with the coil rotation for changing the current direction of the change to the device. Each half-circle rotation (180 degrees), the coil current to change direction once. Brushes: carbon usually made of slip ring brush contact with a fixed location to be connected to power.

qualified electric bike conversion kit model

Posted by on March 12, 2025 Comments Off on qualified electric bike conversion kit model

In 1997, China’s first a qualified electric bike conversion kit model was born in Nanjing company. January 1998 visit, Vice Premier Li Nanjing Daluge company inspection, after the test ride on electric bike conversion kit to give full recognition.

    From the first a qualified electric bike kit shipped to 2000 electric bicycle conversion kit industry begun to take shape, and then in 2008 the national electric bicycle conversion kit close to 100 million users, electric bicycle conversion kit industry through the years ups and downs, ups and downs. In this decade, electric bicycle conversion kit technology, while the rapid development can not be said, but it has been followed by consumer demand, unknowingly, the various effects of industry, technological innovation continue to be developed. Meanwhile, the rise of various non-electric bicycle conversion kit on the wave of invention, but also to some extent the industry into a creative vitality.

    It can be said that China’s light bike conversion kit is the rise and development of basic research from the beginning, which also determines the electric bicycle conversion kit, as it most closely with the industry, will obtain the support of the masses and the government vigorously promote . As a lightweight electric bicycle conversion kit technology latecomer countries, China electric bicycle conversion kit industry has shown amazing vitality. In just ten years time, China has reached global electric bicycle conversion kit cutting edge of technology, with very encouraging results.

How-to-build-a-freewheel-hub-motor-for-electric-bike-conversion-kit

Posted by on March 12, 2025 Comments Off on How-to-build-a-freewheel-hub-motor-for-electric-bike-conversion-kit

These days 250w hub motor wheels are popular with European. Nearly all of hub bike motor are brushless geared. Because there are several gears inside hub. It has more powerful than 250w brushless geared motor.
Order 1 set 12″ 14″ 16″ 18″ 20″ 24″ 26″ 700c 27.5(650) 27″ 28″ 29 inch hub motor electric bike conversion kit , convert your common bike to e-bike is so easy. Directly front or rear drive your bike.
The important part is an engine -hub motor. How to build this? There are some differences with brushless freewheel hub motor.

Step 1: winding
Calculate motor power, speed RPM and confirm what type of copper wire would you use, wind copper wires by handwork or machine, each notch should be separated by insulating paper so that not shot circuit between the coil. It takes about 1 hour to done it by handwork. And should use rubberized fabric to wrap your fingers. Nipping copper wires will break your fingers.

Step 2: fix axis into motor
Put axis into rotor winding and use a key to fix axis. Use A-B glue to paste three hall sensors on hub motor rotor, put 9-pin (three pin/each hall) into PCB and use insulated wire to fix it. Put 8-pin cable inside the axis and heavy yellow, blue, green wires to connect the three copper wires(Phase A,B,C) separately. Thin red, black wires are be weld to PCB + and – .

Step 3:soak paint
After winding should soak paint in order to be insulated. Use brush to put the insulated paint on the winding and make sure be soaked everywhere. It takes about 24 hours.

Step 4:press gear into hub
Use presser to press steel 90-gear into hub. This hub with one side cover.

Step 5:fix three gears
Use retainer ring and key to fix three white nylon gears on one steel 21-gear.

Step 6:fix magnet
Fix magnet inside the hoops.

Step 7:install rotor winding into this magnet hoops.

Step 8:install there gears on the axis of this rotor winding and put inside of hub with 90-gears.

Step 9:install the other cover.
Use screw driver to tight screw nuts. Done it.

Power on battery and use bldc motor controller to drive this hub motor. If no any strange noise. It’s okay.Then according as the size of your bike to fit this geared spoke hub motor to 20″ 24″ 26″ 27.5″ 700c 27″ 28″ and 29 inch bike kit wheel.

Hub motor, bike kit, bike motor supplier: Leaf Motor Technology Co., Ltd

looking for some hub motor

Posted by on March 12, 2025 Comments Off on looking for some hub motor

We are looking to source some hub motor for a US based e-scooter project.

This one is a prototype but we hope to be in limited production later this year or early next.Each scooter will use two hub motors.

The hub motor needs approximately the following peak spec’s:
Work Voltage:36-48V nominal
Motor Speed:500 rpm at nominal voltage
Power:700-1000W steady state
Full axle (i.e. mountable on both ends)
DC Brushed or Brushless Permanent Magnet
160mm max width

Several of your hub motors seem to be pretty close to this.

From your website:
HBl — turns ~300rpm at 36V. Extrapolating out from the speed constant,at 48V this winding would do about 400rpm. This might be okay but do you have a winding with a higher speed constant?

It looks like the HBL-16″ is the same hub motor with a rim already mounted. This would be of interest.

Please let me know if I can buy 2-4 of these, and how fast I could get them in the United States. Do you have a dealer that stocks them in the US or do you ship direct from China?

Answer:Our 48V 1000W hbl hub motor is fit for your order.Standard 26″ 48V 1000W hub motor wheel reaches 26.7m/h.If need faster speed hub motor. We can customise motor speed.

We suggest you choose 16″ 48V 1000W rear hub motor.It’s 135mm width and
fit for 135mm fork.There are two screw threats on each side cover that are used to install disk brake and 6-sprocket.We re-change the gauge of the coil wires and/or the turns number of the coils,the fastest speed can reach more than 700rpm.

About motor drawings,please visit or download from https://www.leafmotor.com
We can ship 2-4 sets of samples to you by EMS.It takes about 3-7 days to deliver.

Thanks for you are interested in our hub motor.

Hub Motor controller for electric bike motor kit

Posted by on March 12, 2025 Comments Off on Hub Motor controller for electric bike motor kit

Hi, my name is Joseph, I am from USA and I already got two electric bike motor kits from you in the recent past.

But now I have the need to buy a new hub motor controller that works with 60 volt , I have 8 lead gel battery. The one I had from you is 48v 13amp and worked fine during long time. But with 60v is now is burn… Motor ok, 1500 w, lcd3 also works fine. Can you get the same type of controller with 60v output? With regen function and reverse like the 48 v controller?

I know that I must be careful with motor in future using 60v, but i take the risk because buy a complete new kit is too much tax .

If it’s possible I will be happy to ride again scooter

Yes,we have 60v LCD hub motor controller.
Features:
Suitable for Electric for electric bike & scooter
Rated Voltage: DC 60 Volts
Min. Voltage: DC 40 ± 0.5 V
Rated power: 2500 Watts
Casing material: aluminium
Maximum Current: 55 A ± 1 Amps (Updated to be 55A)
Thermal: aluminum shell and the substrate

3 phase 120° brushless motor
Operating Conditions: -20~45 °C
Waterproof design
Size: 234 mm L × 82 mm W × 42 mm H
Weight: 1.1 kg

Working with LCD-003
Display: speed, mileage, battery gauge…

Functions:
Mute when start
Speed limit
Power cut brake
Blockage protection
Current limit protection
E-ABS brake
Short circuit protection
Avoid out of control
1:1 pedal assist function
Undervoltage protection

Additional features:
* Cruise
* Reverse
* Regen brake
* Pedal assist ( 1 – 5 )
* Mph / kmh
* ….

Leaf hub motor bike kit is working

Posted by on March 11, 2025 Comments Off on Leaf hub motor bike kit is working

Q: The bike conversion kit system is now working.
Still have some questions. It is about the brakes.
If we take the red and black wires from the scooter brakes and connect in parallel to the connection of the new hub motor controller, will this have a negative effect on the controllers? My friend thinks that this should not be a problem since this only brakes a circuit.

A: About that brake has two types.ONE is high voltage to brake.The other is low voltage to brake.
Ours is low voltage to brake,you should check your old hub motor controller whether that is low voltage to brake.
If you have volt-meter,you could get about 5V from red and black wires from your old hub motor controller.If it’s 5V. That’s no problem.

Q: We finally got the chance to try the new bike conversion kit wheel after doing all the modifications except for the front brake which we still have to modify.

We have a new problem and I need your expertise. I tested the bike conversion kit wheel up the hill and on its own (without using the rear wheel motor). It went up the hill at about 17 km/hr……..which I think it is satisfactory.

However when I took it up a steeper but very short incline which is on my way home, the fuse connected to the batteries got blown and lost power (no electricity).

The fuse is gauged at 10A. What should I do to avoid blowing out the fuse? If I change the fuse to a different amperage, will this have negative consequences for the rear motor? Do you suggest anything different?

As always, appreciate your assistance.

A: When up the hill,the current will reach about 15A.If too steep hill,it will reach more than 20A.
20A-30A current is easy to break controller.
Sometimes 15A continuous current for about half an hour also can break controller that’s because of too hot will break hub motor controller’s MOSFET.

We suggest:
* Cool controller is important.
* When you up hill,use two hub motors.On the flat road,use one motor.

Our hub motor bike conversion kit can’t get any problem when your up any hill.But should cool controller.

Use 15A-20A fuse.Had better to use 15A.But if use 20A fuse,climb hill has more power.But we worry controller.

E-bike with electric bike kit almost done, but..

Posted by on March 11, 2025 Comments Off on E-bike with electric bike kit almost done, but..

E-bike with electric bike kit almost done, please help with final issue: Throttle

Q:I am almost done with electric bike kit, everything is okay except the throttle is not working. I connected the old throttle from my old e-bike, it’s connections fits the lcc-001 controller.But as I connect it, the motor doesn’t run at all.
What kind of throttle is to be connected to this controller to achieve speed control from 0 to full speed: meter type or Hall Effect type?
My current throttle is 3 wired connected to a very small chip, which is moving along a magnet.

Answer 1:Please check three-pin throttle connector.

Answer 2:Disconnect and re-connect these two connectors.Check male-female connector and pins.
If still not work,buy a new throttle or use a meter to replace.

Answer 3:Make your electric bike kit wheel in the air,short red and green wires(3-pin throttle connector on controller).
Power on battery,motor will run as the fastest speed at once.
If not,it’s not throttle issue.

Answer 4:Yeah,jump red and green wires.If your system is no problem,e-bike can run at once.
Make sure your electric bike kit wheel in the air.

Answer 5:You had better to cut off three-pin throttle connector.Then connect wires as below:
Throttle —– Controller
red —– red
black —– black
white —– green

If you have volt-meter,pls power on,then test voltage from controller throttle connector.
1.red and black is about 4.5V
2.green and black is about 2.3V

Make a jumper between red and green,the electric bike kit wheel will run at once.

Done following above,if no any voltage and still no work.Please replace controller.

Q:Thanks all,I dis-connected throttle connector and found green and white wires didn’t touch well.Re-made a new throttle connector,supply power,electric bike works without any noise.Prefer leafmotor’s electric bike kit.

How to make a hub motor for electric bike?

Posted by on March 11, 2025 Comments Off on How to make a hub motor for electric bike?

How to make a hub motor for electric bike?
Motorized hub motor can drive your e-bike.Everyone know motor controller,battery,throttle,brake lever etc other accessories.
But for motor,it seams a little mystic.Actually it’s not.
Because of hub motor doesn’t have two carbon brush inside motor,so called brushless. If have,it’s brushed hub motor.
Now we talk about brushless hub motor.
This hub motor is made of copper coil, aluminium / or steel rotor bracket,three hall sensors,

Needs below stuff：
1.1 pcs of Al motor hub and 2 pcs of Al motor covers (made by foundry)；
2.1 pcs of axis (fix on rotor);
3.2 pcs of bearings (fix on each cover);
4.magnet (distribute inside hub);
5.copper coil;
6.aluminium / or steel rotor bracket (made by foundry)；
7.three hall sensor.
8.six screw or more;
9.insulating paper;
10.A-B glue water (fix hall sensors on rotor)
11.8-pin cable (Yellow,blue and green three wires are used for motor phase A,BC…the other five wires are for hall sensor,red is supplied +5V,black to ground.Yellow,blue,green three wires are connected to separate three hall sensors.

Needs tools:
1.screw driver;
2.rubber / or wood hammer;

The important and complicated step of make a hub motor is circle coil.It’s made by machine or handwork.If magnet no change, just change the gauge of the coil wires and/or the turns number of the coils so that change hub motor ‘s power and speed.

After circle coil,then use A-B glue water to fix three hall sensors to each rabbet.Connect 8-pin cable to hall sensor and motor phase A,B,C

Install rotor inside hub,mount each cover.Use bldc motor controller to test hub motor.

20 inch 36V 250W front hub motor – electric bike conversion kit

Posted by on March 11, 2025 Comments Off on 20 inch 36V 250W front hub motor – electric bike conversion kit

Q: We are interested in leaf 20 inch 36v 250w front hub motor – electric bike kit. Item ID #LBCK2036250F
When I buy this electric bike conversion kit . I saw picture full Twist (Twist throttle No battery gauge), please can you change to half Twist? I want this Half Twist. My DAHAN will work match washer + front hub the 100mm fork and disk? See link info the DAHAN how look Hope help.

A: This bike conversion kit doesn’t need battery gauge, because LCD can display battery gauge, we can ship you a half twist throttle to replace this full twist.
If the spacing of your fork is 100mm (picture enclosed),this #LBCK2036250F can work with disk brake.

Q: We will buy this bike conversion kit later. LCD display have MPH? I see this youtube for full max speed 21.7mph which is 36V 10Ah Rack lithium ion OR 36V 8Ah bottle lithium battery?
I think will buy any online for 36V 10Ah Li-ion Water bottle Battery, will super up hall and super run road full 21.7mph?

A: This LCD display KMH, can’t display MPH now. One week later, we will have new LCD controller. This hub motor controller has more function:
 Cruise
 Reverse
 Regen brake
 Mph / kmh
 Pedal assist ( 1 – 5 )
 …

This old hub motor controller work with this 20 inch 36v 250 front hub motor wheel. Max speed:21.7mph (We test use 36v lead acid battery)
36V 10ah Rack lithium or 36V 8ah bottle lithium ion battery both can reach max 21.7mph.

We have 36V 11ah lithium-ion water bottle battery in stock, but we haven’t updated it to leaf site. The difference between them is the bottle size of 36V 11ah higher than 36V 8Ah bottle.

When you use 36V 10ah lithium-ion water bottle battery and ride it, full speed is about 18mph.(21.7mph is no load)

Sure if I would buy the 36V 8ah bottle lithium ion battery can work with 20 inch 36V 250W front hub motor max full 21.7mph and or 24 inch 36V 250W front hub motor max full 26mph? (LBCK2436250F)

My DAHAN Typhoon twin Brake right please find attach see picture, if this e-bike right brake cable can off one, or get right twin brake e-bike?