Category Archives: BLDC motor

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

18 inch 48V 52V 1000W rear hub motor – electric bike kit

I’m interested in your 18 inch hub motor electric bike conversion kit I was curious is this a right hand drive or left hand drive ? Does this come with a sprocket, and if so how
Many teeth does it have ? Is this strictly pedal assist or will the motor engage while pedals are at a stand still?
Do you have a 1000watt hub motor for the drum brake wheel? 
Do you make 16inch electric front wheels for surrey bikes ?  The axles seems slightly different then your standard bicycle front wheel 
Do you have a diagram as to how the drum brake connects to the wheel ? 
I see that’s a separate drum break to purchase. How does the 1000watt wheel attach the drum break? Is there a mounting system on the wheel ?
The actual drum break 1000watt wheel comes with everything needed correct ? 
I would rather purchase from you if possible since our communication has been the best. Can you work with me on the price of the wheel ? 
Are the drum break to the wheel universal?  May I ask why the drum brake isn’t included with the wheel?
What is the return policy in case I have issues with it fitting my bike or performing ? 
I am now in the process of ordering the electric wheel kit for our surrey bike. Before ordering I was curious do you have the updated lcd screen for this model ? 
It would be the same wheel, the rear 18inch wheel conversion with drum break. 
Is there any documents showing the way the lcd screens look? Is one better then the other ?
 I can choose a colored lcd screen for the controller as well correct? 
Before I make a purchase I was going to ask do you offer a thumb driven accelerator switch instead of the throttle handle like a dirt bike. 
Can you send me a picture of what it looks like please. 
I was asking if I could see a picture of the thumb throttle as well
One more question about your thumb throttle. Do you have a thumb throttle that does not have the handle attached ? I’m trying to secure the thumb throttle to a sealed bar so I need it to open and latch over the bar to secure it instead of slipping over the end of a bar like a bike handle grip. If this makes sense? 
Sounds good. If I were to want this one how would I express in my order I would
Prefer this thumb throttle ?

1500W Leaf Motor with 20″ x 4″ wide “Fat Bike” wheel

Q:Do you sale 1500w or higher hub motor laced into wheel that is 20” diameter by 4” wide for fat tire bike? If so, what are the dropout width options for axle? Can axle dropout width be 150mm wide or even wider? I have a bike frame with 170mm dropout width. I can use torque arms and spacers to fill some of this space, but not too much.

If available please quote price for:
~1500w newest model hub motor with 20” diameter x 4” width wheel (pre-laced service)
~Need motor/wheel laced with 1 cross pattern. Radial lacing is acceptable but not preferred. Black spokes preferred.
~Need 150mm or wider axle dropout width.
~Need turn count which contains HIGHEST AMOUNT COOPER FILL
~Need temp sensor pre-installed in bike motor
~Need single speed freewheel (11 or 12 tooth preferred) pre-installed
~Need SHIPPING to U.S

Also, can you sale with 750W sticker or engrave on bike motor?

A: We can make this 20 * 4 wide Fat Bike wheel.
Please click below site. This is our 20 inch 48V 1000w Fat bike wheel – It’s 20 inch bike conversion kit for fat snow bike.

We also can make 1500w bike motor.
* 1500w with 20 * 4 — Okay. (If your tire is 20 * 4 “, 20 * 3” rim is much better fit for 20 *4” tire. Also,we have 20 *4” rim)
* Please click above site. Wheel looks the same this one.
* At least the dropout 170mm or more
* With temp
* Can use single speed.But min 16 tooth can be installed on this motor. (Can’t use 11 or 12 tooth,only no motor hub use this 11,12)
* Ship to USA is okay.

Q: The tire is “Stingray tire” type. 20″ * 4 1/4″. If you think 3″ wide wheel will fit better ok. 16t freewheel is ok. Rather 1500w if motor will handle more power. Which turn count do you recommend for speed 35mph?

A: We recommend leaf 13 * 5T winding rotor.

1500w rear hub motor with bike rim

Q: I’m looking for a powerful direct drive rear hub motor for a 26″ MTB.
I’ve been looking at this motor:
1.Is this the best 26″ rear hub motor you have or do you recommend any other bike motor?
2.Can this hub motor be delivered with a temp sensor installed?
3.What type of gear cassette will it be able to fit with a 135mm dropout? (How many gears)
4.Can this bike motor run higher than 48 Volts? 52 Volt maybe? Or 72 Volt?

A: 1. We have 26 inch 48V 1500W rear hub motor. We recommend this one
2. With temp
3. Max 7 speed and fit for 135mm dropout. Default for screw on sprocket.(If you need to install cassette sprocket, should leave message when you order.
4. We recommend work at 48V battery.(Max 60V)

Q:Can this same rear hub motor also be delivered with a 27.5″ x 50mm tubeless rim?
I will install a 7-speed cassette sprocket, so very good that it supports this.

A: 27.5” and 26 inch are different rim.
If 27.5” rim is smaller than 700c and larger than 26 inch rim?
* If you need to install your 7-speed cassette sprocket. Please Note when you order.

Q: I want to use the newest 1500w hub motor in this bike:
If you press the green + (View all components) on the page you can see that it has 27.5 INCH x 50mm, tubeless ready rims and 142x12mm (Ai offset lacing) rear drop out.

So I’m wondering if you can deliver the hub motor with a rim that’s the same dimensions as the original rim?

A: We have some sample of 27.5 inch rim in stock. Looks the same to the one on your site.
We only ship two 27.5 inch hub motor kits to USA one time two month ago.(ONLY one customer need this 27.5 inch by now)
This 27.5 rim is smaller than 700c and larger than 26 inch.

Q: This sounds good. Thank you for even taking pictures.
How wide is the 27.5″ rim you have? (How many millimeters)

strange problem with 5000W bldc motor

Some very strange problem with 48V 5000W bldc motor. Purchased six motors half a year ago, for EV project. We managed to get to the actual testing with your motors only now.

When started our tests, we faced very strange problem.

Need help and suggestion on what the reason of problem can be.
We have or own BLDC controller, with three half-bridge, PWM for low
gates and block commutation for high gates. Everything works great,
but motor does not start in two particular positions of rotor.

If refer to the wiring diagram, motor does not start when try to
rotate it clockwise (if I look into shaft) when:

1) Hall sensor with yellow wire is activated, others passive
2) Both hall sensors with yellow and green wires are activated, blue
is passive.

When try to run it counterclockwise it doesn’t start in two other
positions when:

1) Hall sensor with blue wire is activated, others passive
2) Both hall sensors with blue and green wires are activated, yellow
is passive.

Please note that in both cases the positions where motor doesn’t start
are consequent.

Motor starts perfectly in all other positions of Halls. If motor
started in some other position, it rotates without problems. I think
it simply passes the problem angles due to inertia it has.

I checked, double and triple checked my truth table and it is okay.
It works great on some other BLDC motors I have.

Then I thought that this particular motor has problems in its wrings
inside and tried other motors I purchased from you. All six motors
show the same problem, in the same positions.

So I have two possibilities now:

1) There are some “dead” zones inside motor which I’m not aware of. I
think this is an issue. If so, please let me know how to overcome it.

2) Something wrong with my controller. But this is unlikely. Firstly, it
works with other BLDC motors without problems. Secondly, your motor
doesn’t start in two consequent positions of rotor. If algorithm is
wrong, then it will fail on some opposite positions, not consequent.

Please, let me your thoughts on this problem, as I’m starting to think
that there is some secret in motors that I don’t understand!

Any help will be greatly appreciated.

And please note that letting aside this above mentioned problem, your
motors are pure gold and we are going to order some good amount for
our EV factory in next months, if we settle this very problem I talk
of.

Bldc stepper motor for electric bike

In the subsection of section Classification of electric bikes we looked at options for motors used in electric bicycles, their positive and negative sides.

Let’s try to analyze and compare the characteristics of electric motors (bldc hub motor and bldc stepper motor)from one well-known manufacturers: Leaf Motor (China).

Leaf Motor produces sets with a motor-wheels, and the other kits that use a chain drive.
The analysis will be based on data from well-known owners of electric bikes site EValbum, the characteristics of the manufacturer, and other sources on the Internet. Therefore all figures are approximate, and the findings are an expression of opinion ePowerBikes.ru

As stated by bldc hub motor, voltage motor-wheel independent maximum speed:24V – 25 km / h, 36V – 32 km / h, 48 V – 50 km / h. These data are confirmed by practical measurements elektrovelosipedistov. The maximum velocity at the start line set bldc stepper with 42 km / h and end with 120 km / h. Those cyclists who speed up to 30 miles is enough, can choose a motor-wheel 24V,36V,or 48V.

For practical information, electric bikes with a motor-wheel 36V 500W and lithium-phosphate battery 10Ach a maximum speed of 32 km / h and can cover a distance of 50 km. For those who want to ‘fly’ at speeds above 50 km / h, suitable set of Leafmotor 601kit-1 48V 1000W e bike kit.

Compare sets with the same maximum speed – 45 km / h – a new set 601kit-1 48V 1000W bldc hub motor and bldc stepper 48V 500W. Based on the characteristics of graphs,we choose the rate at which engines operate most efficiently, it is 40 km / h for both.

For the same power consumption in this mode – 420-440 watts, at the time of bldc stepper motor is a little more, but this is neglected. It turns out that energy costs are the same at a speed of 40 km / h. We obtain a theoretical figure 10.5 Wh / km, although in practice the number is likely to be greater. Now suppose that we face a steep hill. The maximum torque developed HBL hub motor – 30 Nm, bldc stepper motor – 38 Nm.

For the calculation we use a calculator elektrovelosipedista. Let Curb weight of a bicycle with the stepper motor – 100 kg, the rise of 7% of 3.5 km. To overcome this recovery time is needed more than 26 Nm on the wheel 26. ” Power expended by the motor-wheels 601kit-1 e bike kit is more than 1060 W at a speed of 35 km / h. Total energy costs – 106 Wh.

What makes it with bldc stepper-kit? He switched to the lowest gear, increasing time and decreasing the rate of 2.4 times (for cassettes with a maximum star 34t). At 2600 revs / min, torque on the shaft of the gearbox – 11 lb lost by power – 390 watts, speed – 14.5 km / h. Cost of energy to overcome lift – 94 Wh. Switching gears allow the rider to use the bldc stepper with the maximum efficiency of ~ 83% versus 73% for motor-wheels 601kit-1. As you know, the availability of transmission system for a bicycle greatly expands the range of effective use of a set of bldc stepper motor. These are one of the best available right now,s o if your´re looking for one, check it out. 9-14 cassette on the wheel 26 “will change the torque of 6 to 60 Nm and a speed in the range of 11.5-45 km / h (about 2100-2900 revs / min) at an efficiency of above 80% (included efficiency gearbox and chain drive). Efficiency of the motor-wheels 601kit-1 has a maximum value of 78% of torque 10-16 Nm.

It is logical that upon arrival at the ideal surface Bonneville Salt Lake in Utah, at 40 km / h, both test sets will spend the same amount of energy. But as soon as the trial will move to an area with hilly terrain, a set of bldc stepper will be more economical than 601kit-1, and of course will be able to overcome the ups who his opponent will not under force.

We note again that the higher efficiency is achieved when using leafmotor’s bldc stepper motor in the range of maximum efficiency, extended thanks to gear bike.

hub motor and the BLDC motor

Synchronous and BLDC motor are AC powered motor is AC power supply by 50 weeks and turn. BLDC motor is the stator into the alternating current, a rotating magnetic field, and the rotor magnetic field generated by the sensor, so that two magnetic field, along with the rotor and the stator rotating magnetic field rotation. Which slow the rotor than the stator rotating magnetic field, there is a deterioration of sync so called asynchronous machine. The hub motor stators with the BLDC motor, the rotor is formed artificially by adding the same DC magnetic field, so that the rotor on the stator rotating magnetic field along with the simultaneous turn before said hub motor. BLDC motor is simple, low cost, easy to install, use and maintenance. So widely used. Disadvantage and low efficiency, low power factor on the grid negative. The hub motor is a capacitive load, high efficiency, can improve the power factor, multi-purpose large-scale mining did not prepare.

hub motor and the BLDC motor stator windings are the same, the main difference is that the rotor structure. hub motor’s rotor with DC excitation windings, so they need external excitation power, the introduction of current through the slip ring; the BLDC motor’s rotor is short-circuited winding, the current generated by electromagnetic induction. In contrast, hub motor is more complex, high cost.

Uses: hub motor generators are mostly used in large-scale applications. The BLDC motor is used in almost all motor applications. hub motor can be flexible and adjust the input side of the excitation voltage and current phase, that is, the power factor; BLDC motor power factor is not adjustable, generally between 0.75-0.85, so in some large factories, BLDC motor used more often, you can attach a hub motor to do tune cameras, used to adjust the factory interface with the grid power factor. However, the hub motor, high cost and maintenance workload, compensation is now generally use capacitive power factor.

Comparison of motor start-up mode

1 Direct start: by the power capacity limit

2 series reactor startup: starting torque is not easy to lead, may be secondary impacts.

3. Autotransformer start: start a buck, there are secondary impacts, adjustable voltage range is limited.

4 soft-start variable resistance: thermal resistance, fluid resistance,

5. Magnetron soft start: adjust the conduction angle of SCR power controller to regulate the flux of change.

Soft-start frequency: AC – DC – AC mode, the voltage can be controlled to become the frequency AC power for high voltage motors.

Motor star delta starter

1 When the load on the motor starting torque is not critical but also limit the motor starting current and the motor to meet the 380V / Δ wiring conditions in order to start using delta method;

2 The method is: when the motor starts the motor connected as a star after a successful connection when the motor starts to divert into a triangular electrical wiring (by double-throw switch quickly switch);

3 due to motor starting current and power supply voltage to provide start-up time is proportional to the current full-voltage start-up current is only 1 / 3, but only full voltage starting torque starting torque for 1 / 3 Star delta starter, is a step-down start it at the expense of power in exchange for reducing the cost of starting current to achieve. It can not be dismissed and the size of the motor power required to determine whether a star delta starter, but also to see what kind of load, generally need to start light load, heavy load operation can still be a star delta starter, under normal circumstances, squirrel-cage motor starting current is 5-7 times the running current, and voltage requirements of the grid is generally plus or minus 10% (I remember) in order not to form the grid voltage is too large so the impact of a star delta starter, the general requirements in squirrel-cage motors power transformer rated power of more than 10% will use star delta starter. Only squirrel-cage motor was a star delta starter.

BLDC Motor application introduction

BLDC Motor is an DC motor, the load speed and frequency of the received power ratio is not constant relationship. Also changes with the size of the load. The greater the load torque, rotor speed, the lower. BLDC Motor, including induction motors, doubly-fed BLDC Motor and AC commutator motor. The most widely used induction motor, without misleading or confusing in the case, generally known as the induction motor BLDC Motor.

Ordinary BLDC Motor stator windings connected AC power grid, the rotor windings and no other power connections. Therefore, it has a simple structure, manufacture, use, and easy maintenance, reliable operation and low quality, and low cost.

Hub Motor with high efficiency and good performance characteristics, from no load to full load range almost constant speed, the majority of industrial and agricultural production to meet the requirements of mechanical transmission. Hub Motor protection is also easy to generate a variety of school types, in order to adapt to different environmental conditions need to Hub Motor is running, you must learn from the reactive excitation power grid, the grid power factor deterioration. Therefore, the drive ball mill, compressors and other high-power, low-speed machinery and equipment, often used synchronous motor.

Because BLDC Motor speed rotating magnetic field speed with a certain deterioration in the relationship, its speed performance is poor (except AC commutator motors).

BLDC motor and brushless motor

  For a long time, there is a big battery technology R & D bottlenecks, many countries have committed to developing higher-performance electric car motor vehicle in order to obtain improved performance, China is no exception.

    As early as four years ago, the market is still in the majority of electric bicycles use BLDC motor stage. BLDC motor uses a mechanical commutation, the control system technology, less demanding, lower cost than the brushless motor, BLDC motor starting torque is slightly larger than the brushless motor.

    BLDC motor has several weaknesses: short life, noise, and low efficiency. Short life because it uses carbon brush, turning the process easier to damage. Also wear a lot of toner dust generated, these dust fall gear oil, gear oil to speed up the drying, to further increase the motor noise.

    BLDC motor used once a year or so to replace carbon brushes, carbon brushes replaced after one charge mileage car bought less than two-thirds of the time, but also in the climbing area seem less motivated, even burn control. This is because the carbon brush replacement motor, the commutator also grind a groove, so that the contact area to reduce the carbon brush, carbon brush of poor contact will spark power and speed and oxidation of copper commutator, resulting in the undesirable phenomenon.

    brushless motor is a special kind of DC motor, it uses built-in sensor plus electronic commutator method for electronic commutation, brushless motor mainly to eliminate brush wear and brush contact noise generated.

    From the low-speed electric vehicles since the advent of the motor, brush and brushless motor of the dispute has been no stop. Comparing both, brushless motor really is superior to BLDC motor, brushless motor also known for its excellent performance for the general consumer acceptance. Currently, almost all electric bikes are used a brushless motor, brushless motor instead of BLDC motor is a must.

Domestic electric BLDC motor

 The so-called nanotechnology, refers to the scale of 0.1-100 nm, the study of electrons, atoms and molecules within the law of motion and features a new technology. Scientists in the study of matter in the process, found in the nanometer scale of a few isolated, several dozens of atoms or molecules can be significantly demonstrated many new features, and making use of these features have specific functions for the technical , is called nanotechnology. Nanotechnology manufacturing of electronic devices, its performance is much better than traditional electronic devices: work fast, low power consumption, small size, light weight, electronic volume and weight greatly reduced. BLDC motor of the leader, the United Kingdom motor using nano-technology, successfully developed a new generation of internationally efficient brushless motor. After loading the measured electric car specialty stores, BLDC motor with high efficiency, low temperature rise, ride comfort, good stability, a fundamental solution to the electric vehicle motor efficiency due to low mileage due to riding too close, climbing implementation of the bridge, high energy and many other defects, the electric car race minds at ease.

    Currently, the motor was first applied to the domestic electric car companies, the first new type of motor spirit has been through Shanghai Electric Vehicle Co., Ltd. All buyout. The BLDC motor material is ultra, ultra-fine particles of new high-strength metal materials, with a special magnetic compound treatment, with superior quality, the internal magnetic field and the motor running without moving parts, compact, no travel restrictions for linear motion and circular movement with unmatched precision. Expert Review of its features love: love of electric vehicles using Aoli Xi BLDC motor, the motor will never rust, runs smoother ride, starting more stable. Shanghai Electric Vehicle Co., Ltd. spirits through the introduction of this technology developed by the “love” brand electric cars once sold in the market. When brand new cars are out of the budget, you can always cars van nuys ca.