Monthly Archives: May 2020 - Page 3

power on the electric bike hub motor was gone

Posted by on May 16, 2020 Comments Off on power on the electric bike hub motor was gone

Electric bike hub motor kit was gone, how to solve it?

Received my electric bike kit .Product list:
1.26″ 36V 250W front brushless geared hub motor wheel
2.36V 6-MOSFET brushless motor controller working with LCD(display speed,mileage,battery gauge..)
3.standard black twist throttle with battery gauge
4.brake lever with low voltage to brake
5.three button-ON/OFF switches that are used for control front&rear lights,cruise,horn…

Check rim whether in the middle of fork and the direction of hub motor runs.Then I have installed everything on my bicycle according as instruction manual and the electric bike kit worked fine.

I was running e-bike about 25km and then I stopped the electric bike motor . Charged the electric bike battery because I was staying there for some hours. Started on the way home and after some heavy hills (about 3 km)it was completely dead. The electric bike kit system was running like normal up to this, but suddenly all power on the electric bike motor wheel was gone.

Those three led lights on twist throttle for electric bike battery were still lit. I tried to turn e-bike off and on again, but same result. Today the electric bike kit is still dead.

Do you have any idea? Measured 0,1 Ohm between the electric bike motor(hub motor phase wire: yellow, green, blue).Infinity between hub motor cable and hub motor cover. So it does not look like it is burned. The electric bike motor controller has 41,8 Volt input.

Measure the hub motor hall sensor:
Red, black, yellow, blue, green wires.
1.The voltage between red and black is 4.5V;
2.The voltage between yellow and black is 4.2V or 0V,(When use hand to turn hub motor, the voltage will change from 0~4.5V~0~4.5V)
3.The voltage between blue and black is 0.2V; (When use hand to turn hub motor, the voltage could not change)
4.The voltage between green and black is 0.1V. (When use hand to turn hub motor, the voltage could not change)

From above test data, I doubt there were two hall sensor inside the electric bike motor that were broken.

Electric bike hub motor kit was gone, how to solve it?

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

The issue about 250W hub motor electric bike kit

Posted by on May 16, 2020 Comments Off on The issue about 250W hub motor electric bike kit

Bought 1 set of electric bike kit from one supplier in China two months ago. Sent more than 10 emails, haven’t gotten any reply. I met below issue, hope solve it.

When I was riding my electric bike three weeks ago, the 250w mini front hub motor suddenly started to make a strange and strong noise. If I try to turn the twist throttle on when the e-bike doesn’t have any load, I keep the hub motor wheel in the air. The electric bike motor works fine and electric bike kit does not make any noise.

However, if I try riding my electric bike and turning the throttle on, the electric bike motor starts making a strong and continuous noise. I tried to riding my bike keeping the brakes continuously pressed and any noise appears so it seems to be some electric problem. It is very strange and I am so much worried.

I took off electric bike kit wheel and used screwdriver to disconnect six screw nuts, took apart hub motor cover and found there was a rotor-winding, two bearings, three sets of 42-gear, 1 set of 21-gear on the axis, 1 set of 81-gear on the hub. There wasn’t any impurity inside the hub motor. Re-install and test electric bike motor wheel, still have the same problem. Don’t know what’s the problem.

Contact my supplier many times and can’t get any reply. I looked for answers by google, yahoo and bike forums, still can’t find the correct answer. Yesterday I got a message from my US friend about there was a company, leaf motor can help me. So I sent an email to leaf motor.

Surprisingly just half an hour past, leafmotor replied me and asked me to check the bearings. How to check hub motor bearing? Take off two bearings from axis, and use little finger to hold inside of bearing, the other hand to turn bearing, faster, better. If you can hear some noise from bearing that can confirm the problem comes from electric bike motor ‘s bearing. At last, I found there was a bearing was broken. According as the bearing model, I bought two new ones in market and replaced them.

Test electric bike kit wheel in the air, no noise. Brake hub motor wheel, still no noise. Nice, Have solved it.

I should thank leaf motor that help me and I found fun through repairing electric bike motor. Now I decide to buy leaf ‘s electric bike kit if I have need and will recommend my friends to order leafmotor’s electric bike motor, bike kit…

Though I haven’t ordered any goods from leafmotor by now. But they are very professional, has best service and believe they have high quality products.

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

LCD bldc motor controller for e-bike

Posted by on May 15, 2020 Comments Off on LCD bldc motor controller for e-bike

There are two types of hub motor wheels are used for e-bikes. One type is hub bldc motor , the other is brushed hub motor. Because the brushed motor had some disadvantage of high noise, shorter-use life, low efficiency..

These days hub bldc motor wheels are used for electric bikes widely and had replaced brushed hub motor.

So more and more motor controller are showed in market. For example: cruise brushless controller , regen brushless controller, programmable brushless controller, lcd bldc motor controller…

Convert a bike to an e-bike, we should choose a hub bldc motor wheel with brushless controller and throttle, brake lever,on/off switches,disk brake,front&rear lights,horn..etc accessories

European like 250w hub bldc motor and North America prefer 750w / 1000w bldc motor. How to purchase a good brushless controller to drive this bldc motor .

Generally 250w bldc motor need to be driven by 6-MOSFET brushless controller, and a 9-MOSFET motor controller dirves a 750w bldc motor,a 12-MOSFET brushless controller dirves a 1000w bldc motor.

Now nearly all types of brushless controller for e-bikes have cruise, alert, reverse, limited speed..etc. function.

If you buy 1 set 48V DIY kit, you had better to choose 48V 12-MOSFET/15-MOSFET brushless controller. Please don’t order 9-MOSFET motor controller to drive your 1000W brushless controller, it’s the heart of e-bike. 1000W bldc motor will bring larger current and high temperature, 9-MOSFET can’t afford.

For the bulk .of motor controller, larger, better. Larger bulk has better cool system.

In past, there was a guy sold regen motor controller, but nearly all sold regen controllers were broken in 30 days. Because when you brake, this regen controller will bring twice current to stop your e-bike, thus larger current would break MOSFET directly.

Now programmable controller is still showed in market. This brushless controller seem has nice face, but its head is small, can’t stuff more MOSFET. Use this brushless controller to drive 750w / 1000w bike system and break this nice face controller is normal. Don’t be arrest by programmable. You will find nothing for actual use when you use.

We have LCD cruise controller, more MOSFET, don’t worry your motor controller will be broken.
LCD bldc motor brushless controller for e-bike.

Bldc motor, motor controller , brushless controller supplier: Leaf Motor Technology Co.,Ltd

The issue about electric bike battery for bike kit

Posted by on May 15, 2020 Comments Off on The issue about electric bike battery for bike kit

We purchased an electric bike kit including motor controller, hub motor wheel, throttle, brake lever and with 36V 12AH Lithium Ion electric bike battery that used for testing 36V solar charger from one supplier, not from leaf motor. After charging this electric bike battery for 10 hours by better solar power, full charged, we rode the bike, but hub motor wheel only run about 8km. Then we use 110-230Ac charger to charge this electric bike battery and full charged it. After test, we found this hub motor wheel is still lasted for around 8km.

We use a amp meter in series to electric bike kit system, powered on and rode it. We got the current is about 5A. The RPM is 257RM. We use 26 inch hub motor wheel.

We calculate the speed is about 32Km/per hour.
See below formula:
（3.14×26”×0.0254）× 257RPM × 60 minutes ÷ 1000 (m-Km)=32km

If this is 12Ah battery, per hour lost 8ah.We can use 1.5 hours.
See below formula:
12Ah ÷ 8ah/per hour= 1.5hours

We think full charge this electric bike battery per time, the hub motor wheel can run about max 48 km. 32km/per hour × 1.5 hours = 48 km

There is definitely a problem with this electric bike battery, I’m not sure whether electric bike kit is because of the solar charging or our testing, or if it has a fault. But I need a replacement electric bike battery asap, because we don’t have any more 36v electric bike battery, and we sold 1 set of electric bike kit with lithium battery last week. I think BMS inside this electric bike battery no problem. The problem comes from the lithium battery cells. Maybe this electric bike battery had stayed in warehouse for a long time and haven’t charged it. It will make the electric bike battery cut down the achieve distances and use life.

So if solve this problem and let my hub motor to work asap, only replace all cells or replace new electric bike battery.

We are angry with our supplier, sent them many emails and no any reply.
Thank you, leaf motor. Help us found the electric bike battery ‘s problem. We are going to order leaf’s products in near future.

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

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

Posted by on May 15, 2020 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.

electric bike kit doesn’t work

Posted by on May 15, 2020 Comments Off on electric bike kit doesn’t work

electric bike kit doesn’t work…
Q:Help me! my electric bike kit doesn’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 make a small noise 1 second and doesn’t work. The 3 lights doesn’t light anymore until about 30 seconds later.
I haven’t installed the PAS. Do I have to do that before the bike will be able to spin?
A:Don’t worry.
Could you take a photo with your wires how to connect about your electric bike kit?
1.Non’t connect eight wires(5 hall+3 motor) of motor,turn the motor with your hand.If it runs freely means the motor is good.
2.Then try electric bike kit again
1).disconnect the cruise green connector(green and blue wires)
2).check the throttle connector,make three wires are connected well.(red -red,black-black,green-white) or you could use another twist throttle to replace this.
3).make sure the connector of the battery positive is good.
Q:I disconnect the wires to the motor and the wheel run freely. I connect again.

I disconnect cruise control (green and blue)
I check throttle wires, okay
I check battery wires
I turn on the battery with the key and press the throttle but there is no difference. (It doesn’t work)
I remove the thumb throttle and replace it with the twist throttle , but it still doesn’t work.
I connect the cruise control but its still doesn’t work.
A:Is your thin red battery wire(power switch) connected okay,this wire means a lock,if you connect this wire to battery +,it will make the motor run.
If this isn’t connected well,electric bike kit can’t work.
Q:I took a look at the thin red wire (power switch) that is connected to the bigger red wire labeled +. It look good and has no loose ends.

DIY kit with electric bike battery

Posted by on May 15, 2020 Comments Off on DIY kit with electric bike battery

Q:I bought DIY electric bike kit unit and a lithium electric bike battery and installed on my bike a couple of weeks ago since I had gotten one of the a couple of days ago and I wanted to use my bike as soon as possible. I have driven the bike for a while without an issue. However, after 2~3 charges, the battery does not get charged anymore. When I plug the charger to the battery, I noticed that the charger LED still remains green. When it charged, it turned to red before. Would you please guide me how to resolve this issue?

A:The LED on your charger turn green quickly or can’t change color,it just means your electric bike battery doesn’t need to be charged.
Could you use a volt-meter to measure the voltage of your battery?How is the voltage?
Q:I measured electric bike battery:DC Voltage 30V.
This is what happened:
I fully charged the electric bike battery over night and went to work on bike next day.
On my return to home, when pushing down thumb throttle all the way down,hub motor was running for one second and down for two seconds and repeat. So I thought the electric bike battery was low.
A:If the voltage of your electric bike battery is 30V that means your BMS inside your battery have been protected.
You should take off all load,for example:headlights,led throttle,horn etc.Then the battery will return normal.
Could you disconnect all wires from your battery,then measure the voltage of battery again?
Q:Actually I measured 30V directly from the electric bike battery outlet. So there was no load when I measured it.
Is there anything I should check?I checked the output of the charger and confirmed that electric bike battery has output of 40V.
So upon plug it into battery, if I still have green LED, then there is a open circuit in the battery?
Is there anyway I can check this electric bike battery at the charging inlet or power outlet without opening the battery package?

36V 500W / 36V 750W brushless motor controller

Posted by on May 15, 2020 Comments Off on 36V 500W / 36V 750W brushless motor controller

DC motor controller has two types:brushed & brushless controller.
The principle of brushed motor controller is much simple.But brushless motor controller should control brushless motor phase,limit starting current,control speed,PWM control etc.
MOSFET is an important part of controller.More MOSFET,controller is more expensive.
Generally 6-MOSFET brushless controller is used to control 36V 250W bldc hub motor.
36V 750W brushless motor should be controlled by 12-MOSFET controller.
Now we use 15-MOSFET to control 48V 1000W brushless motor.
Never worry break controller.

Model:LCC-001 36V 500W / 36V 750W brushless motor controller
Working with LCD
Special Features:
1.EABS System
2.1 + 1 Assistance
3.Idle Running Protection
4.Dynamic Motor Lock System
5.Motor Shaft Lock Protection
6.Power Tube Protection
7.Cruise Speed Control
8.Self-check Protection
9.Speed Limit
10.Remote Control Anti-theft

This 36V 500W electric bike conversion kit,Product list:
1.1 pcs of 20″36V 500W rear motor wheel (fast speed);
2.1 pcs of 36V 500W controller with LCD (display speed,battery gauge,mileage..);
3.1 pcs of 36V twist throttle with battery gauge;
4.1 pcs of brake lever;
5.1 pcs of three – button ON/OFF switch is used to control horn,front&rear lights,etc.
6.1 pcs of threaded-adapter is used to fix disk brake

hub motor shook when powered on

Posted by on May 15, 2020 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 May 15, 2020 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.