Three-phase asynchronous hub motor controller start-up
(1) direct start
Start-slip rate of 1, induced electromotive force in a large rotor, the rotor currents are also high. When hub motor controller starts at rated voltage, known as the direct start, direct start of the current is about 5-7 times the rated current. In general, the rated capacity of 7.5kw to small asynchronous hub motor controller can be directly started.
Starting control circuit used direct electrical appliances including combination switch, button, contactor relays, thermal relays and fuses. To master their individual characteristics, control of both the fuse fuse rated current calculations.
Direct-start control circuit: control of its control principle.
(2) squirrel cage induction hub motor controller for reduced voltage starting.
Master star – start angle and step-down autotransformer starter works
(3) wound three-phase asynchronous hub motor controller start-up
General understanding.
Tag Archives: bldc motor
Three-phase asynchronous hub motor controller start-up
hub motor controller working principle
hub motor controller electronic reversing device, instead of the traditional mechanical commutation device (commutator and brush), not only retained the DC motor speed control with good starting characteristics, and AC motor with simple structure and easy maintenance This motor in good, reliable, therefore, the rapid development in recent years. Traditional DC motor armature is rotated, the pole is stationary, but bldc motor driver in this contrast, the magnetic pole is rotated, the armature is stationary, the armature winding current commutation can make use of position sensors and electronic switching circuit to complete. Brushless motor. hub motor driver generally motors, position sensors, and electronic switch consists of three parts. Motor itself consists of multi-phase (three phase, four-phase, five-phase range) armature windings on the stator pole and a certain number of permanent magnet rotor component. AA, BB, CC, said three-phase motor stator windings, NS is a permanent magnet, the motor rotor, PS is the rotor position sensor, and its coaxial rotor and motor rotor is connected, BG1, BG2, BG3 electronic switching circuits power switch, three-phase windings A, B, C respectively, BG1, BG2, BG3 in series to the power supply after. Its operation principle is that a signal controlled by the PS BG1, BG2, BG3 and other switch on on and off, when the switch turns on, the corresponding stator windings, there is current and magnetic field through the magnetic field and permanent magnetic interaction between the rotor pole will generate torque, the motor rotor, the motor coaxial with the rotor position sensor is connected, it also followed the rotation of the rotor and in turn to BG1, BG2, BG3 signal to control the turn on and off, to the armature winding current with the rotor position changes according to the order of commutation, the magnetic armature rotary stepper motor’s rotor to rotate continuously go on.
BLDC hub motor bike conversion kit works
We test this bike conversion kit before shipment. If three led lights on throttle can’t work, please connect green wire to the positive of electric bike battery.
About anti-theft, you should disconnect two power wires (one red thin wire and one red thick wire).
Another red thin wire should be connected to a lock or a switch in series.
I find the problem and it’s was the thumb throttle who is not working… I changed the thumb throttle and replace it with the twist throttle and it work fine,,, but I am not satisfied because I prefer the thumb throttle so if I return you the thumb throttle would you send me a replacement one.
I got also another problem in the installation manual online you describe a procedure for anti-theft and I am not able to use it… What is a Cut off power to supply (called soft-switch is turning the key)
So please tell me if I mist something because the bike conversion kit system is not working.
Text for installation guide need clarification
6. Anti-theft alarm setting:
Cut off power supply to hub motor (called soft-switch, but hub bike motor controller is still powered
on) and take out the electric bike battery key, within 10 seconds press and hold the cruise
control button until you hear a beep sound, then release the cruise control button.
The bike conversion kit system is now protected from theft and the hub motor is electronically locked.
Any movement or vibration of bike conversion kit system will trigger the siren for 30 seconds, and the bike motor wheel will resist any pedaling movement.
Was this thin power wire connected well? If did no problem, are you sure that five hall wires from hub motor weren’t be connected well.
Could you try it as below :
Use your hand to turn your hub motor wheel, then turn your twist throttle, maybe do like that, it can turn.
It’s not working. Tell you what I done
Check all the connection three times also check with the diagram all wires and they are OK
Only thing I got: the horn is working and the gauge show full (3 lights) when I turn on the electric bike battery, also when I push two times the cruise button I get a loud beep from the horn and that’s all.
After a road test nothing at all it’s like having nothing at all…
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
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.
Electric hub motor bike conversion kit for electric bike
Ride a bike everyday is good for health. It can help you lose weight and achieve healthier body. By the way,sometimes riding for a long trip or steep road that is too tired.Buy a new e-bike is too expensive.Why not place an order for bike conversion kit and convert your common bike to electric bike by yourself.
Standard bike conversion kit includes:
1.hub motor wheel (8″ 10″ 12″ 14″ 16″ 18″ 20″ 24″ 26″ 27.5″ 700c 28″ 29″ 27″)
2.motor controller(drive hub motor)
3.twist throttle or thumb throttle(default twist throttle)
4.brake lever with low voltage to brake
5.three-button switches(control horn,led lights,cruise..)
6.pas(for Europe)
7.battery with charger(optional)
1 set of bike conversion kit has three key products:hub motor,motor controller and electric bike battery.
Hub Motor:There are 8″ 10″ 12″ 14″ 16″ 18″ 20″ 24″ 26″ 27.5″ 700c 28″ 29″ 27″ hub motor,what inch would you choose depend on your common bike wheel size.Motor type:brushed hub motor or brushless hub motor also called BLDC hub motor.Now because the bldc hub motor has advantage of low noise,high efficiency that replace of brushed hub motor.
Leaf Motor has 36V 750W / 48V 1000W brushless gearless electric bike motors are popular with North America.The other 24V 250W / 36V 250W bldc geared hub motors,European prefer them.
Motor Controller:Bldc motor controller which is called a heart of bike conversion kit system.Generally 6-MOSFET controller drives 250W hub motor,9-MOSFET drives 500W,12-MOSFET drives 1000W bldc motor.
Leafmotor is selling a LCD motor controller that display speed,mileage,battery gauge.
Battery:In China,electric bikes still use lead-acid batteries,they’re much cheaper,but a little heavy.North America or Europe always use lithium batteries that are more environmental.
Leafmotor has three types of lithium batteries:high speed,frog and bottle electric bike batteries for customers to choose.We found most of issues from lithium batteries that were not used correctly.
Three are two advice about how to use lithium battery.
1.Please remove power connector. If you don’t ride your e-bike for a couple of days.
2.Charge your battery often,but please don’t overcharge it.
Received your bike conversion kit,please check packing box first,then disconnect it and check each product that make sure all goods are okay.Then prepare below tools to install bike kit.
1.open-end wrench(loose/tight screw nuts)
2.philips screwdriver(fix LCD)
3.some zip ties(fix wires)
Remove the front or rear wheel.Find out the motor’s direction of rotation.Fix this motorized hub motor wheel to your frame fork and use open-end wrench to tight both screw nuts.According as install instruction manual and wiring diagram to connect wires make sure your wheel in the air,power on your battery,test bike conversion kit system.Turn throttle,if motor works well without any noise.Then use zip ties to fix wires.If not,please re-check your wire connecting.
If everything is good,it will take about 10 minutes to done it.Just order 1 set of electric hub motor bike conversion kit,your common bike will become electric bike.Cost less,get more.Have you found some fun?
Hub motor,bldc motor,bike conversion kit supplier: Leaf Motor Technology Co.,Ltd.
Hub motor kit ceased to function
On February 8th we ordered your 26″ 48V 1000W front electric bike kit(1 set of 26” 48 1000W hub motor wheel with lcd bldc motor controller,twist throttle,brake levers,48V lithium battery) which was delivered to us on February 13th.Shipment is very fast.But the packing box is broken,we disconnect it and found the left brake lever was defective and I e-mailed you about getting a replacement set of levers. You told me that the parts would be sent. They never were received. I disconnected the lever plugs and have been using the bike for the past 1 month without them being hooked up.
Last week the bike ceased to function. I have 50+ volts going to the bldc motor controller connection but when I plug in the hub motor controller, the voltage drops to 1.8V and nothing happens. When I disconnect the hub motor connection, the voltage remains at 1.8V. As soon as I disconnect the battery, the electric bike battery shows full voltage of 50+ volts. The voltage indicator lights do not light up at all. So I have good voltage going to the controller but nothing works. I disassembled the controller to see if there was a broken connection or burned out part but can find nothing visibly wrong – when I connect a tester to the board the voltage shows 1.8 when should be 50 at the input connection. Something is wrong internally and I now need the hub motor controller to be replaced. I am relying on the electric bike kit to get to and from work so time is very important to me.
Please send me a new hub motor controller as soon as possible. Also send me the previously promised brake lever set replacement at the same time (as long as it does not slow down the shipment of the hub motor controller). I would also appreciate it.
Hub motor,bldc motor,electric bike kit supplier: Leaf Motor Technology Co.,Ltd
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
battery level
Q:small detail. lights of the twist is on but i run motor until battery come dead then the lights all together come off there is no color change when battery get lower
Answer 1:
yeah,seems it can’t display correct.
My 26″ rear wheel 48V 1000W electric bike kit,48V twist throttle with gauge
Power on 48V li battery,three leds(green,yellow,red) be on.
I ride for a long distance last time.Three leds still be on together.I thought it still could run more.After ten minutes later,green led was off.Only yellow and red leds be on and climb a steep hill,the bldc motor stopped.Turn off,then turn on,still can run.But it would stop at once.
Answer 2:
My 26″ 36V 250W bike kit with LCD display.
Though my throttle also has this battery level,I never notice it.
That LCD is really good,can display the voltage of battery,speed,mileage etc correctly.
Answer 3:
This battery level on throttle was designed as the voltage of lead acid.
1.More than 48V,green,yellow,red three leds all ON.
2.From 47V~48V,green OFF,yellow and red ON.
3.Below 47V,only red ON.
48V Battery Full charged G/OFF discharging R/ON discharged
Lead-acid 54V>48V(G,R,Y ON) 47V~48V(G/OFF) <47V(Only red on)
LiMn2O4 54V>48V(G,R,Y ON) 47V~48V(G/OFF) <47V(Only red on)
LiFePO4 60V>48V(G,R,Y ON) 47V~48V(G/OFF) <47V(Only red ON)
When the voltage drops at 47V.
1.Lead acid still can work normal.
2.LiMn2O4 and LiFeO4 are hard to work,it can't supply large current,BMS will stop cells working.For example:the voltage of li battery is 48V,still climb the steep hill,green led will be off at once,after about 10s,yellow led will be off,only red led ON.
Answer 4:
Never see this battery level.I will charge battery after running 30miles when it’s new.
Now I should charger it earlier.
Answer 5:
My bike kit works with 48V lead-acid battery,no problem.I will charge it when the green led is off.
Answer 6:
It’s a pity,this lcd can’t work with 36V 750W brushless controller.
Answer 7:
I found good led light,it can display battery gauge.
Answer 8:
My 250w electric bike kit working with lcd.
Answer 9:
Nice lcd and lights,but can’t find these lights shown on leafmotor’s website.
Answer 10:
I found a li battery on leafmotor’s website.It has gauge on battery shell.
Answer 11:
These green,yellow,red three leds on throttle only display approximately,if need to know exact battery gauge,I think had better to order LCD.
bldc motor for electric bike
Because of lower noise, more powerful,longer life.Now bldc motors are popular for electric bikes.
This motor can be easily built into a wheel hub,called brushless hub motor or done a chain drive,named stepper motor.Stepper motor is more powerful than brushless hub motor.
As all known,hub motor is easy to convert e-bike,but for bldc motor,it’s so easy to convert.You should use a chain to drive wheel.
We have three kinds of bldc motors.It aslo is made up of rotor winding,hall sensor,bearings,axis,gears.
Because of gear drive,it’s more powerful than common brushless hub motor.
1.BLD-500 bldc motor Net weight:6.08kg
2.BLD-650 bldc motor Net weight:6.53kg
3.BLD-800 bldc motor Net weight:8.8kg