Very good, there is less than one in 50 yuan, and the content is detailed.
The following is what I typed and uploaded word for word.
What is the brand, model and price of the lightest electric moped, and what stores sell it?
It is produced in Beijing, Beijing Shenzhou Judian New Energy Technology Co., Ltd., mainly producing power lithium batteries, with one of the smallest bicycles, ultra-light weight and aluminum alloy body.
The price is 3,000 yuan, and the battery accounts for 1500 yuan. The battery is in the middle of the bicycle bar and inside the bar. You can run 15km on a single charge, which is about 10 ampere-hour capacity, 24 volts. The front wheel drive is adopted, and the motor is installed on the front fork. The plastic rim on the front wheel has internal teeth, which are consistent with the gears on the motor.
Shenzhen ZOOM Ruim, Shenzhen Xinlong Health Industry Development Co., Ltd. (No.Longfa Road 1 1, Longhua Sub-district Office, Bao 'an District, Shenzhen, Store: No.35 Wenxin 1st Road, Nanhai Avenue, Nanshan District, Shenzhen, 0755-8313/KLOC-0. Moped and electric vehicle are different in design, structure, technology, engineering difficulty and safety, so they cannot be confused. Here are their differences.
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Where can I find a Japanese Yamaha electric bicycle monopoly in Qingdao (telephone number)
At present, most of them are smuggled, and the price in 500 yuan is about 1000 RMB. Unlike domestic electric cars, this kind of car is power-assisted. If you don't ride a bike, its motor won't turn, and the riding torque is directly proportional to the driving current of the motor. When your riding torque exceeds a predetermined threshold, the driving current of the motor will linearly decrease. When your riding speed exceeds 16 km/h, the driving current of the motor will decrease linearly. When the bicycle speed exceeds 24 km/h, the driving current of the motor will drop to zero. If the wheel is stuck, you should apply a torque to the pedal of the bicycle for electric maneuver. If the car still doesn't move, cut off the input current of the motor, turn off the switch and restart it. The overall structure of this torque sensor is very reasonable, and it can transmit the torque of rotating transmission parts to a fixed angular displacement sensor, which shows that it has a solid industrial foundation in the material, design and processing of mechanical structure. Similarly, the internal transmission of bicycles was successfully copied in China 40 years ago, and was officially installed on commercial bicycles for sale. Due to the limitation of materials and processing conditions, this reverse engineering technology from physical mapping can never last long. Japanese law stipulates that bicycles should have headlights. Generally, generators driven by friction front wheels are used, and a few of them are drum generators with front wheels, rotating external permanent magnet tiles and fixed internal permanent magnets. A structure similar to the motor pulse tachometer generator in industrial control is adopted, and the generator coil is clamped by soft iron with thorns on both sides. Bicycle generators in the history of China were single-stage structures with external lines. Most mopeds in Japan are three-speed internal transmissions, usually with a central motor, a reduction gear and an overrunning clutch. Most smuggled Japanese moped batteries have reached the cycle life of charge and discharge, and there are original110v chargers. Generally speaking, Suzuki cars have the largest power.
Just entrust the sailor to buy it. Pay attention to taxes, stealing bicycles is a criminal offence in Japan! Japanese mopeds generally use brush motors, and the maximum power of motors on bicycles is stipulated by law. Hua 1.5 yuan to 15 yuan RMB can be converted into power-assisted and electric dual-purpose without changing the original controller.
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What are the disadvantages of using lithium-ion electric vehicles?
For chemical secondary power supply, the longer the charging time, the smaller the charging current and the higher the number of charging and discharging cycles of the battery. Generally speaking, it is the long life of the battery.
What kind of bike is the most labor-saving and fast?
700-type tire, 27-inch wheel diameter kilometer racing car is the most labor-saving, but the tire strength is low, and it is still the law that its spokes will prick two holes when embedding grooves, just two at a time, no more or less; You can't drive on a bumpy road or pick up people.
600 yuan/car, bearing material is poor. The normal price is 3,000 yuan/vehicle, at least for bearings in Taiwan Province Province.
Generally, it is recommended to use Japanese-made and smuggled second-hand bicycles, generally 300-500 yuan, ordinary tires with 24-inch, 26-inch, 1 and 3/8-inch sections, which are quite suitable for long-distance riding, such as salesmen who send plane tickets, photos and express delivery, and home appliance maintenance personnel. Imported ones with cross sections of 27 "/kloc-0" and 3/8 "are also very good. Suitable for tall people, generally similar to the front diagonal beam of women's cars. The disadvantage is that tires need to be purchased from rubber enterprises in Taiwan Province Province, such as Jianda Zheng Xin, Jianda and Huafeng, which are not available in many areas. The brand-new bicycles produced by China, a Japanese-funded enterprise, are not as good as the second-hand Japanese bicycles smuggled in. Pay attention to motorcycle locks and handcuff bicycles to fixed water pipes and traffic signs to prevent theft. Mountain bike tires are too wide, suitable for riding on rugged mountain roads, suitable for carrying heavy objects, and it is tiring to ride on urban roads.
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Hello, everyone, hehe, I'm 19 male, a college student. I go to school locally, my home is in the city and my school is in the suburbs, which is about 12 km. Do you recommend buying an electric car or a bicycle?
Please help me choose. Small electric cars are quite fashionable. The basement of electric cars similar to motorcycles is not convenient for road racing, bicycles and mountain bikes are a little heavy.
Thank you! Problem supplement: I don't live in school, get up early for school, come back at noon, and have no classes in the afternoon.
Road racing is preferred. Usually, 700 tires are as thin as sausages. Because the tires are thin and narrow, it is very labor-saving to ride. The vehicle is light in weight and cannot carry loads and goods. The advantage is that it can be conveniently carried in the dormitory and placed beside the corridor or stairs, so as to implement active anti-theft. The disadvantage is that the cross section of the inner tube is small, it is not resistant to vibration, and it is afraid of potholes on the road. Therefore, it is a road racing car, which requires high road quality, and all of them are ordinary brakes. There is no imported disc brake, so the riding speed is fast, the braking ability is weak, the braking sliding distance is long and the safety is poor. Domestic road racing cars are low-priced in 400 yuan, and the normal price is 3000 yuan. This kind of bicycle is sold by fewer people and lost less. Because it is expensive, even if the host goes out to eat food stalls, he will stay within the sight of the other party, always pay attention and take it home at night. Those 30,000-50,000 yuan carbon fiber road racing cars are surprisingly light.
Mountain bike tires are too wide for off-road use and are suitable for bumpy road conditions. Riding is heavier than ordinary 26-inch bicycles with 1 and 3/8 knots.
Battery car? Electric bicycles usually use 12 ampere-hour batteries, and the new batteries will run 15 kilometers. The charge and discharge life of batteries is generally one year. Generally, you will run 10 km continuously after half a year, which is not suitable for you. Besides, ordinary lead-acid batteries are heavy. If lithium batteries are used, in this case, two sets 10 km are needed. The battery is 3000 yuan. Ordinary electric vehicles also have a set of batteries, which need to be modified. There are few domestic enterprises that make power lithium batteries, only a few in Tianjin and Beijing. Ordinary lithium batteries, nickel-hydrogen batteries and nickel-cadmium batteries will explode when used in electric vehicles. Just like you, there is not enough charging time. Fast charging will shorten the charging and discharging cycle of any secondary battery, which is usually called service life. According to your specific situation, buy four sets of lithium batteries and put two chargers at home and school. The one in school is usually continuously charged, because the high-energy battery itself is a bomb. The charger of foreign original moped bicycle has a temperature sensor in the battery pack, and the foreign charger has no peak pulse ultra-high voltage output, so it is unattended when charging. Household chargers charge power lithium batteries, power nickel-hydrogen batteries and power nickel-cadmium batteries. You should not charge them in the dormitory. It is appropriate and safe to pay the person on duty at the door. If the battery is stolen, don't expect to claim compensation.
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Principle of Mechanical Work: Man and Bicycle
Compared with people walking, bicycles are obviously labor-saving and seem to save distance. What happened? Tell me what you know, be more specific!
There were public conclusions decades ago; When people walk, they should raise their center of gravity by 2 cm every step and move forward under the action of tendons and gravity. Cyclists do the same work in the same direction, and they can also slide.
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How to choose a bicycle?
I am a girl, I want to buy a bike to work, which is environmentally friendly and healthy, hehe ~ ~ Good idea!
How to choose a bicycle and what should I pay attention to?
Or do you have any good styles to recommend?
Please give some advice!
Supplementary question: brand? What brand is good?
Several decades ago, China imported bicycles from foreign brands such as Three Guns. Women's bicycles are characterized by high handlebars and distinctive body, which shapes the image of a lady. Please look at the old photos.
At present, Japanese bicycles are generally bought, which can be entrusted to seafarers, and high-end bicycle shops can also purchase imports. There are also smuggled ones.
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Is the electric car charger model a multi-functional model or is it paired according to the electric vehicle model?
All chargers with perfect design and manufacture can be used. Generally, it is divided into three categories according to the output power: battery charging of information electronic appliances, such as mobile phones and MP3 players; Electric vehicle battery charging; Car battery charging. In the industrial and transportation industries, there are also batteries for railway locomotives, wharf forklifts, telecommunications and servers, and program-controlled telephones.
For electric vehicles, there are 24V, 36V and 48V output voltages, which can limit the final charging voltage; Output current 1A, 2A, 3A, 4A is basically universal. As for whether to charge in multiple ways at the same time, that was the basis 30 years ago. Miners in other people's coal mines are charging in batches.
In fact, it is difficult to give consideration to the design of charging long-distance targets. Specifically, there are no elevator residents at the top floor, and chargers are installed indoors. Low-voltage, ground-based electric vehicles are charged through wires 50 meters to 100 meters long. To ensure that the charging current intensity is sufficient, the charging voltage of the terminal should not exceed the standard at the end of charging. If we want to meet the comprehensive requirements of low power consumption, we need higher skills, such as how to minimize the discharge current of the charged battery to the control circuit without charging power supply. There are many ways to choose from. The DC resistance of the actual long-distance charging line may be 10 ohm to 30 ohm. How to limit the charging voltage, output a constant current, measure the battery voltage, measure the battery temperature rise, and measure the battery bulge, instead of using a four-wire charging power supply (even the basic circuit design of a four-wire voltage-stabilizing and current-stabilizing power supply is not possible for many people in universities now)? Perfect design should ensure automatic protection when the polarity of the charged battery and the charging power supply is abnormal (China disclosed the information 35 years ago, and now the battery connected to the reverse switching power supply will explode! ! ! ), for high-energy batteries, it is particularly emphasized that the charging voltage must not have high-voltage pulse burr, which is easy to cause battery explosion! ! ! Ordinary switching power charger is not suitable.
Because of unemployment and being laid off, I was forced to retire ten years in advance, so I will not release the relevant designs that have been put into practical use for free. This is the responsibility of the Overseas Chinese Affairs Office.
I charge the electric car through the 100 meter long low-voltage line. There is a diode in the battery box to prevent malicious discharge. The diode is connected in parallel with a resistor of several hundred ohms, so that the voltage of the battery pack can be measured remotely (after the charging power supply is cut off, it is measured with a pointer voltmeter on the charger, and the diode is connected in series between the voltmeter and the charging power supply to prevent the battery from discharging the charger and reduce the reading of the voltmeter). Through more means, we can measure whether the electric car is stolen. Of course, the improved circuit is very complicated. There is a perfect electronic circuit on the side of the electric vehicle to ensure that the charging power supply voltage far exceeds the rated charging terminal voltage of the battery, and the battery will not be overcharged after charging.
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Kneel for the circuit diagram of 24V30A charger
There are many such products on sale now.
Customize your own high-power transformer. Generally speaking, the output AC voltage is 24 volts to 33 volts, and the power is 1 kw (it should be volt-ampere). Pay attention to draw more heads between the secondary 24 volts and 33 volts.
The simple method is full-wave rectification of the secondary output and direct output to the battery. The ammeter should be connected in series and the voltmeter should be connected in parallel. The output voltage and output current should be manually adjusted by the switch of industrial appliances (rich in Zhejiang Province), and manually adjusted according to the charging process. As for the charger with automatic voltage stabilization and automatic current stabilization, the control mode information of SCR has been published and printed 35 years ago. The simple emergency method is to use a running lamp transformer (36V safe voltage output), an isolation transformer and an electric welding machine transformer with sufficient power to make several turns on the secondary stage and connect them in series in the forward or reverse direction, so as to adjust the output voltage and charging current to a suitable range.
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How to remove the black oil from the bicycle chain on the school uniform?
Remember, the chain of advanced bicycles abroad uses lubricating paste similar to floor wax and car polishing wax. At first glance, there is no color on the chain. Ordinary floor wax and car polishing wax can be used instead. Clean the chain with diesel oil and kerosene before use, not gasoline! ! ! Including washing gasoline, it's too dangerous.
You use an external variable-speed bicycle, right? I modified several ordinary external variable-speed bicycles and added flexible chain sleeves to show them to a Japanese academician and doctoral tutor. The vast majority of external variable-speed bicycles have no transmission chain cover, and a few plastic external variable-speed bicycles produced in Taiwan Province Province also have no transmission chain cover. At present, half of the smuggled Japanese bicycles are internally variable-speed, and the steel of bicycles is good, light and durable. However, a good horse with a good saddle needs to choose a good lock;
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How to measure the pedaling force of bicycle
Person in charge of report:
At present, a large number of smuggled Japanese mopeds are equipped with torque sensors, which can directly obtain torque signals; This car is newer and has a speed sensor. After calibration, the riding power can be measured.
You can also go to the motor vehicle inspection station for inspection. After the actual test, the torque of people riding bicycles fluctuates greatly. If the average value is used to estimate, the error is very large, and the duty ratio is about one to ten. If you want a calibrated bike, you need a multiplier to get power. It will take several months.
What I'm talking about here is the actual real-time test of bicycle pedaling force on the road. It is unrealistic to measure torque and speed with sensors fixed on the car body from the constantly rotating mechanical structure through the transformation of the mechanism, even in domestic colleges and universities and senior technical schools. In industrial measurement and control, the standard method more than 50 years ago was to stick four strain gauges on the transmission shaft, and use pure silver slip rings and brushes to lead out the tiny resistance changes of the strain gauges. In sports equipment and medical testing instruments, supported by a fixed frame, the examinee drives a fixed motor to test the driving force of human body, and the load characteristics are adjusted by adjusting the transmission ratio or excitation current and load. In the distant past, the pump was driven by people, and the power was converted according to the height and flow of the lifting liquid. At present, the dynamometer test is also to attach a strain gauge to the static bearing seat, unlike the previous method, which requires complex calibration.
There are enough sensors on mopeds in Japan, which can be calibrated for you, and multipliers are provided to directly get the cumulative value of power. If you are a student in any college or graduate school, you can provide free services. The total material cost, including bicycles, is at least 1, 000 yuan to 1, around 500 yuan. What is the strict design price? You can search online and ask the opinions of netizens. The cost of the logistics company is calculated separately, and the school can guarantee that the cost cannot be prepaid; According to the accuracy, all materials and detailed drawings should be mailed to the school you provide. The electric screwdriver for computer hard disk assembly mass-produced in Japan, together with the torque measurement and control system, has a basic price of 40,000 RMB. The cost of the vacuum system for picking up and clamping stainless steel screws is extra.
Please contact the following address directly.
Design of speed odometer for intelligent electric bicycle
According to the needs of graduation project, the design paper of intelligent electric bicycle speedometer is sought for reference. My email address is wj198642865 @163.com, thank you.
This can't be given away in private, but the quality of the whole nation should be improved free of charge.
The popular and simple method is to fix a permanent magnet on the spokes and pay attention to the relative polarity with the induction coil or Hall magnetic field sensor fixed on the car body, so that the speed can be measured. Permanent magnets can also be installed on the pedals. The universal bicycle code watch is such a structure. It has a small single chip microcomputer and a liquid crystal display. It can set the proportional coefficient and adapt to the mechanical transmission ratio of different wheel diameters. It is a simple intelligence. So that the mileage of each trip can be accumulated. If there is an electronic memory chip, the previous mileage can be stored, cleared and set separately. Can telemetry heart rhythm, ECG signal.
For Japanese bicycles smuggled in from Guangxi, whose radiation has spread to the whole country, some front wheels have a small hub generator, from which pulsating AC signals can be obtained, which can save the effort of self-made mileage sensors. Japanese traffic law stipulates that bicycles must be equipped with headlights, so all Japanese pure human bicycles have front-wheel generators. In addition, more structures are external generators, which can be manually disconnected and can also obtain mileage signals.
Less than one tenth of the bicycles smuggled from Japan are mopeds, just like the popular electric bicycles in China. Different from China's pure electric bicycles, Japanese law stipulates that mopeds are mopeds whose motors only rotate when people ride, and are not classified as motor vehicles. In this way, Japanese mopeds are very complicated and exquisite. Whether there is a brush motor or a brushless motor, there is a pedal torque sensor Through the turntable and spring connected with the pedal, the pedal torque is converted into proportional displacement relative to the fixed car body coordinate system. By calibrating this torque sensor, you can multiply it with the speed signal to generate the pedal power signal. Note that some Japanese mopeds use AC induction coils to measure torque, which is generally accurate in manufacture and assembly. There was no speed sensor in the early days of Japanese moped, and the speed signal could be obtained from the torque sensor, provided that people rode continuously.
For domestic brushless motor bicycles, there are generally angular displacement Hall sensors, from which speed signals can be obtained.
The highest level is the speedometer composed of inertial system, which is the basic kung fu of college students under the commission of science, technology and industry for national defense. A set of high-precision geodetic instruments costs more than one million yuan. Being a model is not something that teachers with high academic qualifications and titles can do in ordinary colleges and universities. This is hard work.