Friday, September 23, 2011

electric bicycle motor efficiency

For a long time, the electric bike motor efficiency and power as "not tell" problem, whether it is the standard narrative, or samples of goods, nameplate; whether professionals or sales, purchasing, electric bicycles and motor efficiency Power has never acknowledged and a clear definition. So to re-discuss the electric bicycle motor efficiency and power is very necessary.
Industry-standard motor design, in general there are two principle categories:
1. Fever principles:
Bldc Motor windings, permanent magnet material or conductive parts, the main structural elements (such as bearings) in the economic life period (15-20 years of industrial motors, brush allows the periodic replacement) to allow safe operation within the limits of temperature. The lesions were generally clear for the temperature (or temperature) limit, different materials have different allowable limits of temperature. Polyester fibers such as polyester film paper for the slot insulation and high-intensity polyester enameled wire electrical system is composed of Class B insulation. Allow continuous operation of the winding temperature rise limit of 80K (with resistance assay).
2 Performance principles:
Performance principles including electrical, mechanical and other properties. Usually refers to electrical power index performance (such as efficiency, power factor), speed, rate of change of speed, torque, short-term overload, change to the other. Shape and mechanical properties are generally installed size limit (as in the axial or radial size is restricted), moment of inertia, material, limit speed. Other properties are generally noise, vibration, reliability, performance / price ratio, the special environment uses.
Depending on the application, the motor can be roughly divided into two categories. One for the driver to use, and the other for the control of use. Obviously, the electric bicycle motor, should be classified as a drive motor. In the long-term practice, with the motor drive industry standards, skillfully blend these two principles as a whole. If the temperature rise and efficiency of AC motors are actually very close to the standard limit, you can hardly say that it is "heat principle" design or "performance principle" design. Temperature rise and efficiency while meeting the standard limit value of motor efficiency is usually not high. There is also a "high efficiency" motors, motor efficiency is usually higher than normal 4-7% (with power, speed and so on), its temperature is very low, a "performance principle" design. For short-term use (such as valve motor, sometimes days or even once a year to run) motor, the efficiency is usually not considered necessary to ensure the basic performance requirements of the conditions, should be used "heat principle" design. Conversely we can also say, a motor rated power is uncertain, according to "hot" or "performance" to determine, the same motor rated power to a large extent is a variable value.
Electric bicycle because of its special nature of the energy, the motor should be designed using "performance principle" design, that is designed to be as much as possible to higher motor efficiency. Temperature rise of high-efficiency motors typically not a problem.
I believe many people will say: "Then we put the design of high efficiency motors, not become it?." No! Because efficiency is an effective material (copper, magnetic materials, magnetic materials) to pay the cost, that is, the higher the efficiency, material consumption, the more the higher the cost, more severe motor. Traditional motor design has a classic theory that efficiency by 1%, effective materials to consume 10%. For the electric bicycle motor, you want to significantly improve efficiency is not merely a material cost, vehicle weight and size probably are not allowed.
We said above, the electric bicycle motor should be designed using "performance principle" design, then how to determine a standard performance?
State parameters of the body electric bike (tire tread, size, inflated), and riding the state parameters (riding speed, road conditions) complex, also can not use a standard parameter to describe the riding condition. In general, to 20Km / h constant ground speed riding, the standard load mass (75 kg) and no wind conditions, the electric bicycle power consumption 95-115W, the average power of 105W, we can consider this Electric bicycle is the "standard riding state" when the motor power. Taking into account the continuity of a weak wind and non-small slope can be riding the next (allowing reduced rate), and to have a certain dynamic performance (acceleration), the motor power 150-180W is enough. Electric bicycle ride in the city are often run on start - acceleration - constant speed - deceleration - braking, constant states are often very short. During acceleration, the motor torque or power output limit (more precisely should be the torque, because the power is also related with the speed) depends on the controller's current limit. 3 times rated current (the current standard when riding state 105W, 36V at about 3.6-4.0A, and the efficiency of the motor) to 12A (24V to 18A), can get about 3 times the rated torque. If you want to get better dynamic performance and climbing performance, requires the motor rated power of 200 W or more, this time the motor in the "standard riding state" run, may not be the most energy efficient.
A large number of calculations and practice has shown that the electric bicycle motor, the performance difference is mainly the motor speed, rather than a brush or brushless motors. Of the high-speed motor with a 2-3 level reduction agencies (commonly known as the tooth motor) and low-speed gear box with no direct drive motor (commonly known as motor without gear) to compare and use a statistical curve (20km / h, 610mm bike ) to describe (Fig. 1).
Can be seen from the curves, low-speed motor (gearless electric wheel hub) in the A and B near the high efficiency, generally up to 82-73%. In C (running speed) efficiency performance of the poor. Slow down the performance of the motor to the contrary, that in area B (standard cycling state) the efficiency of the gradual upward trend, the overall average is lower than the low-speed motor, generally between 72-78% (with reduction gear related). Performance than the low speed zone in a good motor, maximum efficiency even in C, D,. In D, the motor speed reducer motor much worse than the performance, but non-limiting area work area, so there is no practical significance. Single indicators of efficiency, low-speed electric motors compared to the wheels and slow, are not overwhelming, can have their advantages and disadvantages, is currently impossible to reject out of any party.
As the special bike run with a single "standard riding state" is not entirely reasonable. If using a statistical weighting factor to correct the efficiency curve, and take the A, B, C three under actual operating range of the envelope curve of the area to determine the "equivalent" of efficiency, it is more objective, but this would allow data treatment becomes particularly complex, difficult to operate, especially in the electric bicycle industry. Therefore, we believe that the introduction of the "standard riding state" is necessary.
Specifically, the "standard riding status" is
Power P2 = 105W (can be determined through further certification is more appropriate value)
Speed ​​V = 20km / h
V = π * D * N * 60 * 10-6 = 1.885 * N * D * 10-4 km / h
D - Wheel diameter calculation, mm (actual diameter of the tires when riding no-load than smaller diameter tires)
N - rotational speed, r / min
To 610mm electric bicycles, for example, electric wheel speed is
N = 106103.3 / D = 106103.3/610 = 174 r / min
Torque M = 9.55 * P2 / N = 9.55 * 105/174 = 5.76 Nm
The reason why the introduction of the concept of power rather than torque, because in a certain speed, different diameter wheel torque difference, while the power is basically the same.
P2 = M * N/9.55 = D / 2 * F * N/9.55 = K * F * V = constant (V is constant)
F - electric bicycle driving force (horizontal component)
M = D / 2 * F
If the standard also provides the "standard riding status" 105W and C the middle point, about 150-180W the efficiency of the two states (or the efficiency of the average) can regulate the actual operational performance of electric bicycles. 105W when the power is called the "standard riding power"; 150-180W of output power can be defined as "power rating."
There are many companies with the highest point of efficiency curve as a product of the "nominal" state is wrong. Because both the low-speed electric motor hub or deceleration, the "operating point" is not the highest point in the efficiency curve. Furthermore, the electric bicycle is a section of the run rather than a point.
Another misunderstanding is the business trying to label their products power very large, sometimes even more than the maximum possible motor power (perhaps also with the sales price is proportional to the power of it!).
As the motor output power
P2 = M * N/9.55
With the increase of the torque M (proportional to the current increase), while the rotational speed N is decreasing, so P2 has a maximum torque when the motor is less than the load torque, the motor will brake the (N = 0) , then the maximum motor torque (current maximum is also known as short-circuit), while the output power P2 = 0.
For low-speed electric wheel hub, the maximum power generally do not. For example, the rated speed of 180 r / min motor, the maximum power of 210W on the good. The higher the speed, the greater the maximum power. Rated speed 2000 r / min above the motor, the maximum power of 400W is not surprising.
The motor rated power problems. YAMAHA think that they will be set at the motor rated power of 235W (our national standard set at 240W Shipi reference to the Japanese technology Tiaojian do not know), because they may be running electric bicycles in Japan, hills, this is their national conditions. YAMAHA motor, without exception, high-speed motor (brushless brush all this) 235W rated power is not difficult to achieve. We use domestic axis drive motor (speed about 2000r/min) can reach this level, even power index is also higher than Japan. Should be noted that high-speed motor (4000r/min or so) might want to use 3 or 2 gear friction reducer (YAMAHA and the domestic production of a mini-hub has been used), the motor no-load current is high, the highest point of efficiency may exceed the actual operating area, and enter the restricted flow area, the actual power consumption of electric bicycles large, not necessarily energy efficient.

Riding a bike Work out Advantages

Routine or perhaps a street electric bike, to a lot people is simply a method of transportation, which helps them in travelling from location to one more. But it possesses a much more to offer than merely journeying . On this modern day period, bicycling is recognized as among the best tactics of performing exercises, and helps a great deal keeping in mind the entire body match and ripped. Other than just doing exercises and travelling, it also contributes a whole lot towards the worldwide aim of minimizing the contamination regarding appear and atmosphere. Nonetheless, a pedal bike can not be tried by using a motor vehicle which is run on energy as you can't journey on there for days, and time also gets a dilemma when you are traveling for a routine. Sometimes, it becomes extremely tough when a couple want to go to the same location, as many rounds are sole seaters. Yet another method of riding a bicycle is in house cycling the most common cardio exercise apparatus used in health clubs and health clubs, and has good riding a bike exercise added benefits depending on mind and body. Beginning Of Interior Riding a bike A number of people just realize that interior rounds are probably the most commonly encountered cardio exercise machines utilized in gymnasiums. But not every one is cognizant of its origins. It was introduced by an expert motorcyclist known as Anthony Goldberg in late 80s.
There was a time when he would not complete his teaching on account of organic hurdles just like weather along with other climatic conditions, which restricted his training sessions. He more presented this idea with an Usa bi-cycle organization referred to as Schwinn, who regarded it, and also, since then these however series are incredibly commonly affecting fitness and health and fitness center centers. Inside Riding a bike motor Workout Positive aspects Household riding a bicycle are some things which even a normal man or women are capable of doing so that you can maintain exercise, and is just about the most best varieties of workout. This is amongst the most best styles of riding a bicycle, using carbon dioxide and traffic under consideration, for you are quite a complicated goes included which might trigger injury. Recumbent mountain bike is among this type of period.
It is considered that the campaigns put in when driving an interior routine is extremely much less in comparison with a normal circuit, but it's not genuine because man or women can arranged his personal setting of operating, with respect to the levels that is secure and ideal. You can also do multi-ply-tasking whilst riding these indoors menstrual cycles, including watch television, chat on the telephone, and together discussion in addition. It is belief that the thighs and leg have to be very strong compared to other parts of the body, reducing body workout is incredibly necessary to have that. So in house riding a bicycle helps in abdominal muscles the calves, lower limbs, shins, as well as joint work outs. Benefits Of Riding a bicycle There are particular health benefits of biking as it tumbles within the class of the extremely frequent aerobic workouts. It really is beneficial for the very center and maintains one's heart whip ordinary. It cuts down on cholestrerol levels which are the blood stream thicker. It keeps the blood pressure and diabetes mellitus under control . You'll find it decreases shape skin, and that way it will help in slimming down. What's more, it will work for a strain reliever as one can enjoy landscape though riding a bike. The body receives a great work out and ends up getting ripped.
It's very important for being in step with every little thing, so a riding a bike workouts is extremely vital in order to be clear of troubles linked to body agony. Riding a bike Training Suggestions Having said that, if someone is going to drive a street bike, there are particular riding a bicycle work out tips one should adhere to related to attire and type of inner wear to get worn out whilst cycling. Although riding a bicycle, most of the people run into backside issues in the near future, which could be managed simply by getting a bicycle which has a back-rest. A speedometer ought to there for the bicycle so that one can retain a with yardage protected when riding the period, and lastly, the added wheels really should be looked after, surroundings ought to be filled in suitable volume to prevent the fits whilst riding these exercise bikes. In order to achieve cycling work out rewards, you should be comfortable with the main advantages of bicycling, and may observe proper tactics and ideas linked to traveling the bike.

Thursday, September 22, 2011

An industrialist must install suitable industrial motors

An industrialist must install suitable industrial motors in order to run applications according to the voltage source available in them. Stepper motor, brushed and brushless hub motor are some of the well known motors available in the market at a wide range. Motion controller devices like linear actuator can handle heavy applications and direct the force in linear motion.
Do you want to run your industrial applications effectively? If yes, then it is essential to install the motors according to the voltage source available at your end. As a matter of fact, applications either run on direct current or alternative current. It is obvious that applications with direct current require hub motors to work whereas bldc motors would be an appropriate choice for applications with alternative current. With the advent of technology you may also find universal motors which can run on both AC and DC voltage. Voltage source play a vital role in the selection of motors because the whole working process is dependent on it.
As far as hub motors are concerned, they are namely stepper motor, linear, brushed and brushless hub motor which demands for direct current to start the operation and provide remarkable results in terms of high productivity level with low investment. Among all of the hub motors stepper motors has gained huge popularity and in great demand among industrialists due to its mind blowing features and affordable rates. As the word suggests stepper motors divide the whole working process in to different steps either half, full or fractional. Moreover, it takes the support of magnetic field for its rotor movement and user must keep in mind that usage of appropriate voltage source is important for the sake of changing polarity of poles being applied to its rotor.
Industrialists who are using applications with direct current and have installed brushed hub motors for running it, they usually come across with defects like brush wear and sparking. One of the convenient medium to avoid such unwanted defects is to install brushless motors which does not have brushes at all so there is no scope for sparking or brush wear. People who need to run their applications in linear motion prefer to make use of linear motors. It is noticeable that if somebody needs to run his applications effectively with alternative current then they must take the support of AC motors which are also known as phase induction motors. Some of the phase induction motors are single phase induction, three phase induction, two phase servo, hysteresis and synchronous motors.                   
While running industrial application one must consider the importance of effective and result-oriented motion controller devices such as linear actuator. It has the capability to lift heavy items which need high speed and high starting torques. So, enhance your productivity easily with these devices!

Monday, September 19, 2011

Ask Yourself These kind of Concerns When researching Cycling Cycling tops

Jоggеrѕ cоuld work in аlmost anу kіnd оf clоthеѕ аѕ long аs they get running ѕhоeѕ, but bіkers practісаlly havе to have thе еxtrеmelу ѕpeсifіc clоthіng of the ѕpоrtѕ actіvіtу.Evеn laіd-baсk іndіviduаls wіll bеnеfit grеаtlу іnsidе cоmfоrt, раce, basіc safety and аlѕо satiѕfаctіon when thеу add rіding а bіke motor.The bі-cуcle bу itѕelf mаy wеll need rіdіng а bіke ѕhoеs аlоng with yоur fіrѕt knowlеdge аbout the аctual chafіng and аlѕo bеating оf аn biсyclе сouсh mау well enсоuragе that yоu wеar biсyсlіng short, nevеrthеlеss, yоu аlsо need to, much lеѕѕ оbvіоuѕly, expеriencе in а vеry bikіng hаt.

Riding a bike conversion will not likely substantially supplment your pace or even basic safety, but they will certainly increase your full using experience of a number of ways.1, they're designed to support the body take care of the force wearing effect regarding wind flow as well as weather conditions because you journey.The majority of biking tops are constructed of manufactured fabrics that will enable your body to be able to perspire and also pull the particular resultant dampness successfully from your surface on the epidermis.Sеveral оf todаy's mirасlе fabrісs, еven though light аѕ you саn, alsо work рowеrfully to bе able tо rejeсt normаl wаtеr and fіght breeze.Cоmbined wіth рrovеn faсt that zipрerеd јersеyѕ cаn be exрosеd as well аѕ sеalеd rіght in frоnt аllowing or еvеn dесreaѕе aіr аir flow, bіkіng суcling toрs increаse tremendouslу fоr thе bіcусlist'ѕ аbіlіtу tо stand up to vеrѕionѕ throughоut сlіmаte.

What еxaсtly iѕ most much-lоved simрly by bіkers about riding а bike kit cуcling jеrseуs, evеn though, nоw іs еasіеr.It dоеѕ not tаkе wеll-known bасk аgaіn bank aсcоunt, rеgulаr alоng wіth rеquіrеd produсts оf аny ѕhіrt.You maу be аnу tоurіng раrticipant, the hugе batсh mаniаc, оr рerhарs a streеt sреed, the trunk bank acсount of the јаckеt 's whаt Mоm Kаngaroo'ѕ tор pockеt wоuld bе to уоur еx joey: Lifе. On thіѕ wallеt, you'll hіdе energy bars, gоo pасkеts, mаybе bее plаnt роllen.Thіѕ is thе stаndаrd on-bike ѕustenancе ѕуstem.Direсtlу intо thiѕ sресіfіc sееmіngly еndlеѕѕ ѕtorаgе area steр, you mау prоducts thе aсtuаl safety glоvеs yоu dоn't nееd sіnce уоur ѕun'ѕ comе out, аѕ well аs thе аctuаl сellphone рrudent indіvіduаls brіng (fоr bаsіc sаfety, not neсesѕarіlу for lazy chаtter).Yоur currеnt kіtten also nеeds tо alwауs be ѕtuffed ѕtrаight іntо this раrtiсulаr wаllet when yоu соnѕume fоodѕ.It'ѕ inсrеdiblе јuѕt whаt moѕt goeѕ іnto this kіnd оf wаllet, and many tyрeѕ оf wіthout drаѕticallу affectіng the pаrtiсular еffіcіenсy оf one's bісуcling.

Cоnѕequеntly just do it.Wear thе јacket.Put it on bеcauѕе gaudіlу aѕ уou dеsіrе. Gаudіnеѕѕ аnd іtѕ cоmрaniоn elegаnсe, arе yоur bіrthrіght as being a biсуcliѕt!

Where to find An easily affordable bike motor

After purchasing a bike conversion, you might be surprised by how much more funds you'll want to spend on all the proper and also risk-free gear. If you don't keep sufficient profit your financial allowance, you might need to check for a lot of good quality items which is low-cost you aren't inexpensive.
You can locate a low cost street motorcycle motorcycle helmet that may still offer you superb protection and search fantastic. Always make sure while looking for a great deal to never bargain using your protection, nonetheless. It really is unquestionable the a single most important bit of motorcycle basic safety items is the bike motor, if the going to go cheap upon something -- attempt to make certain it is not your motorcycle helmet!
It doesn't imply that you can not find a reasonable helmet in the event you play your own charge cards appropriate whilst your eyes open. If you're looking for a cheap motorcycle motorcycle helmet, get one of these sale made. This is often a smart way to acquire a quality helmet for a lower price. The start using season, any time more mature helmets are removed out, is a good time for you to appear.
What many people have no idea of is always that helmet suppliers create new addendums to their motorcycle helmet range with an annual basis. This means that that old headgear must sold swiftly, to produce area to the a. When this happens, generally stores can drop the by using an popular helmet significantly.
If you love to buy with larger chain stores, you might be fortunate getting a cheap motorcycle helmet. These kind of stores buy a lot of many in large quantities, which provides these people savings that happen to be next passed on for you.
Unless you thoughts an ordinary african american as well as white headgear, you may also locate a great deal. A lot of safe and sound headgear that don't are available in fancy colors or perhaps with images could be a excellent low-cost motorcycle headgear uncover.
Variations and fashoins will comw with with various rates. The full deal with motorcycle helmet is definitely more costly when compared with a encounter motorcycle helmet. It's correct, however, which a total deal with head protection provides more and various types of safety.
Several bargain predators searching for a low-cost bike motorcycle helmet choose a used headgear. This is a dreadful thought. A pre-owned helmet features a large chance of staying ruined, and thus won't safeguard anyone.
When you find yourself searching for a low-cost motorcycle head protection, there are many solutions. Do remember nonetheless that your particular head protection is a basic safety tool, and will stop compromised to save a few bucks.
The greatest benefit for the Internet is the ability to check around although still at your laptop or computer. This is the fantastic way to locate a high quality motorcycle helmet that appears wonderful nevertheless will likely do an adequate job regarding defending you. Not only this, however, if you gaze tough enough you will discover a really affordable head protection which will also search and possess the style that will fit you together with complements the color system of your respective cycle.

Monday, September 12, 2011

liquid squirrel cage motor starter cabinet

QSQ-S-500 high-pressure liquid squirrel cage motor starter cabinet
First, an overview
QXQ series of high-voltage AC bike motor starter for water-resistance rated voltage 3-10KV, rated power 200-20000KW large and medium-sized squirrel-cage bike motor kit, or sync the soft-start (and protection), especially the power grid capacity is not prosperous business.
QXQ starter dissolved in water by the ionic conductivity of the electrolyte. Electrolyte filled in the two parallel plane plate (both water resistance of the two electrodes) between form a capacitor-like conductors - water resistance. Its own non-inductive components, and hence the frequency sensitive, such as reactor start-up equipment, compared with the starting power factor, starting current is small.
This technology uses a liquid product in the high pressure of new materials, smart drive, computer simulation, telecommunications, programming control open-loop (QXQ-1), closed-loop control (QXQ-2), and many other modern high-tech man-machine interface . With high control precision, control and reliability, to achieve the purpose of constant current start, soft-start technology in the field of liquid in the domestic advanced level.
This product is widely used in building materials, metallurgy, mining, petrochemical, power, paper, water systems and other industries.
Second, the principle
QXQ water resistance starter, is based on the theory of reduced voltage starting bike motor, bike motor kit in the stator circuit in series with a suitable variable water resistor divider, full use of water resistance and heat capacity will not burn adjustable recoverable and other excellent characteristics, by controlling the transmission system control drag electrode plate movement, changes in action, given the distance between the plates, so as to achieve change in the size of the water resistance, water resistance to change and bike motor slip rate changes simultaneously to achieve the purpose of constant current start, and make bike motor to accelerate to rated speed even shorten the starting time. When the start-complete, the star point and bypass contactor automatically put into the water resistance, bike motor full voltage operation.

Motor Classification

1. Classified according to the power supply
Work according to motor power can be divided into BLDC motor driver and AC motor. Which is also divided into single-phase AC motors and three phase motor electric motor.
2. According to the structure and working principle of classification
According to the motor according to the different structure and working principle can be divided into direct current motor, asynchronous motor and bike motor kit. bike motor kit can also be divided into permanent bike motor kit, magnetic resistance bike motor kit and hysteresis bike motor kit. Induction motors and AC induction motors can be divided into commutator motor. Is divided into three-phase induction motor asynchronous motor, single phase induction motor and shaded pole asynchronous motors. AC commutator motor is divided into single-phase series motor, AC and DC motors and repulsion motor. DC motor according to the structure and working principle of brushless DC motor and can be divided into brush DC motor. Brush DC motors can be divided into permanent magnet DC motor DC motor and solenoid. Electromagnetic DC motor is divided into series excited DC motor, and excited DC motor, and re-excited DC motor excited DC motor. Permanent magnet DC motor is divided into rare earth permanent magnet DC motor, ferrite permanent magnet DC motor and Alnico permanent magnet DC motor.
3. Starting with the operation mode according to classification
According to press start and run motors in different ways, can be divided into single-phase capacitor start asynchronous motor, capacitor-run single-phase asynchronous motor, capacitor start single phase induction motor operation and sub-phase single-phase asynchronous motor.
4. Use classification
Can be divided into motor and control for driving motors. Electric drive motors are divided into tools (including drilling, polishing, grinding, grooving, cutting, reaming and other tools) with the motor, household appliances (including washing machines, electric fans, refrigerators, air conditioners, tape recorders, video recorders, DVD machines, vacuum cleaners, cameras, hair dryers, electric razors, etc.) with small motors and other general-purpose machinery and equipment (including a variety of small tools, small machinery, medical equipment, electronic equipment, etc.) electric motor. Controlling the motor is divided into stepper motor and servo motors.
5. Classified according to the structure of the rotor
According to the structure of the motor at different rotor can be divided into the cage induction motor (the old standard called the squirrel cage induction motor) and wound-rotor induction motor (the old standard called the winding induction motor).
6. Classified according to running speed
According to operate the motor at different speeds, can be divided into high-speed motor, low speed motors, constant speed motors, variable speed motor. Low-speed motor is divided into gear motors, electromagnetic gear motors, torque motors and claw bike motor kit and so on. Speed ​​motor in addition to constant speed motors can be divided into a class, no class constant speed motor, a variable speed motor and variable speed motors, it can also be divided into electromagnetic motor, DC motor speed control, PWM inverter and motor Switched Reluctance Motor. Induction motor rotor speed is always slightly lower than the rotating magnetic field of the synchronous speed. bike motor kit rotor speed and the load is independent and always remain synchronous speed.

Friday, September 2, 2011

lead-acid electric bike battery

One pair of lead-acid electric bike battery business of the special rectification action in the country's largest production base bike conversion - Jiangsu,