1. Production is only allowed after obtaining qualifications Before Used Car were regulated, low-priced Used Car abounded, and since most of the audience were middle- and low-income groups, they attached great importance to price differences. This resulted in some small workshops and small factories without production qualifications. In the market, some no-name, low-price, and inferior Used Car are produced through assembly and shoddy materials and processes. However, there are potential safety risks for consumers to buy such Used Car on the road. Nowadays, with the licensing requirements for Used Car, these Used Car without 3C certification qualifications cannot obtain licenses, which makes consumers not allowed to buy them. In order to solve this problem, the regulatory authorities have raised the qualification threshold and In addition, we will strengthen the investigation and punishment of illegal activities of qualified enterprises producing non-standard products and small workshop enterprises, and strictly investigate and punish unqualified production enterprises. 2. Sales that do not comply with the catalog announcement are prohibited In addition to lacking 3C certification qualifications, according to regulations, Used Car that are not included in the "Announcement of Road Motor Vehicle Manufacturers and Products" and cannot be registered are also prohibited from driving on the road. Therefore, in addition to meeting the production qualifications of a qualified Used Electric Car, in terms of sales, regulatory authorities will also strictly inspect dealers and prohibit the sale of Used Car that are not included in the catalog announcement to

Battery is the power source of Used Car and a key factor that has always restricted the development of Used Car. The main performance indicators of Used Electric Car batteries are specific energy, energy density, specific power, cycle life and cost. For Used Car to compete with fuel vehicles, the key is to develop efficient batteries with higher energy, greater power and longer service life. So far, Used Electric Car batteries have undergone three generations of development and have made breakthrough progress. The first generation is lead-acid battery, mainly valve-regulated lead-acid battery (VRLA), due to its high specific energy, low price and high discharge rate. The second generation is alkaline batteries, mainly including nickel cadmium (NJ-Cd), nickel metal hydride (Ni-MH), sodium sulfur (Na/S), lithium ion (Li-ion) and zinc air (Zn/Air), etc. Various batteries have higher specific energy and specific power than lead-acid batteries, thus greatly improving the power performance and driving range of Used Car, but their prices are higher than lead-acid batteries. The third generation is a battery based on fuel cells. At present, it mainly refers to hydrogen fuel cells. Fuel cells directly convert the chemical energy of the fuel into electrical energy. The energy conversion efficiency is high, the specific energy and specific power are high, and the reaction process can be controlled. The energy conversion process can be carried out continuously, so it is an ideal car. Use batteries.

Regular inspections of the condition of Used Car are essential. It can help to find some hidden dangers in the use of battery packs and correct them in time. If the vehicle's driving range suddenly drops significantly during use, it is likely that at least one battery in the battery pack has a problem and should be sent to a repair shop immediately for prompt processing. Used Car must avoid overcharging, over-discharging and under-charging, as these will shorten their service life. The charging time and frequency should be determined based on the actual vehicle conditions. If the battery meter indicator light comes on, charge as soon as possible, otherwise the battery will be over-discharged and its lifespan will be affected. And the charging time should not be too long, otherwise it will cause overcharging and cause the battery to heat up. If the battery temperature exceeds 65°C during charging, charging should be stopped immediately to avoid danger. If an Used Electric Car accelerates hard when starting, it will cause the battery to discharge at a high current. High current discharge will easily produce lead sulfate crystals, which will damage the physical properties of the battery plates and affect the service life. It is also necessary to charge the battery when parked for a long time. Whether Used Car can be equipped with batteries, it is not necessary. The drive motor of Used Car is directly connected to the motor armature coil through a contactor. Any motor has an operating voltage range. Adding a battery increases the voltage of the original battery pack from 60V to 72V: that is to say, the line voltage increases by 24%. In this case, the motor will be in overvoltage and

I believe everyone must be familiar with Used Car, because we can often see Used Car on the road now, but they are relatively unfamiliar to some novices. So how do you drive an Used Electric Car? 1. The difference between Used Car and cars lies in their different power systems. Used Car use electric drive as power, and the power system is composed of a battery motor and electronic control, while a traditional car is composed of a fuel engine, transmission, etc. In fact, Used Car also borrow many technologies from cars, and the driving operation is close to the style of a car's automatic transmission, so it is also very convenient to operate. 2. Used Car refer to the use of unconventional vehicle fuels as the power source (or the use of conventional vehicle fuels and new vehicle power devices), integrating vehicle power control and drive technologies, forming technical principles and new features. Technology, new structure of cars. 3. Operation must be carried out in accordance with the operating requirements of the "Used Electric Car Instruction Manual". Overloading and overloading are strictly prohibited. If overloaded regularly, the battery and generator will be damaged and may cause safety issues. The battery cannot be left alone for a long time and should be charged at least once a month. It must be charged and stored, otherwise the battery life will be affected. 4. Although Used Car do not have a gearbox, they still have a gear switch. If we want to start the vehicle, we must first step on the brake pedal to energize the vehicle, then press the start button, then rotate the gear to D and release the handbrake. , release the brake pedal and lightly press the accelerator pedal (to be pre

Used Electric Car refer to vehicles that are powered by on-board power and use motors to drive the wheels, and meet the requirements of road traffic and safety regulations. So does everyone know how many years the battery life of an Used Electric Car is? Today our Used Car manufacturer is here to introduce it to you. 1. For Used Electric Car, battery life is mainly divided into cycle life and service life. The power batteries currently used in Used Electric Car are roughly divided into lead-acid batteries, lithium batteries, nickel-metal hydride batteries, etc., and the mature ones are mainly ternary lithium batteries and lithium iron phosphate batteries. 2. The battery life of an Used Car can theoretically be more than ten years, but in reality it needs to be replaced after about eight years. If the battery life is less than 50%, the driving range of the Used Car will be significantly reduced, which is equivalent to having to recharge after commuting every day, which is very troublesome. At this point it is time to replace the battery. 3. Lithium iron phosphate battery has a relatively long life and can be charged and discharged 2,000 times. A single charging cycle is when the battery is charged from zero to fully charged. If it is only half charged, it is equivalent to consuming half of its life. This is calculated and can be accumulated. 4. The cycle life of ternary lithium batteries is shorter than that of lithium iron phosphate batteries. Although lithium batteries can be recharged repeatedly, their lifespan is limited. If used for a long time, the active lithium and active materials in the battery will be lost, and the battery will end its lif

The driving method is not unfamiliar to vehicles. According to the driving method of the vehicle, there are front-wheel drive, rear-wheel drive or even four-wheel drive. Then the question arises. Whether Used Car are generally front-wheel drive or rear-wheel drive is one of the issues that users are very concerned about, then in the following time, the editor will give you a brief introduction. 1. Used Car refer to pure Used Car with a maximum speed of less than 50 km/h. Used Car mostly use lead-acid batteries. Some Used Car also use lithium batteries as their power source. Battery is the power source of Used Car, and the quality of the battery directly affects the use of Used Car. 2. On the market, many cars are front-wheel drive, and many Used Electric Car manufacturers and brands have also imitated this design and placed the motor in the front. Of course, just like cars have rear-wheel drive brakes, Used Car also have rear-wheel drive brakes. A front-wheel drive vehicle uses only the front wheels to drive the vehicle, and a front-wheel drive vehicle uses only the front wheels to pull the vehicle along. 3. The driving layout of Used Car refers to the number and position of driving wheels, the layout of the driving motor system, etc., as well as the position of the reducer, PCU, the direction of transmission, etc. The driving methods of Used Car are the same as those of fuel vehicles, and there are three main types: rear-wheel drive, front-wheel drive and four-wheel drive. 4. It is easier to turn a rear-wheel drive car than a front-wheel drive car. Since it is a front-wheel drive, the force on the two front wheels is the same, and it take

With the development of society, there are now many Used Car on the road. However, many people actually have many questions about Used Car. For example, are Used Car motor vehicles? Today I will give you a brief introduction. 1. Used Car refer to vehicles that are powered by on-board power and use motors to drive wheels, and comply with the requirements of road traffic and safety regulations. Since it has a smaller impact on the environment than traditional cars, its prospects are widely optimistic, but the current technology is not yet mature. 2. Used Car refer to vehicles that are powered by a fully charged battery and driven by an electric motor. The battery power is supplemented by an external power source and comply with the requirements of road traffic and safety regulations. 3. Since the development of Used Car, there are many types, which are usually classified according to the purpose of the vehicle, the number of on-board power supplies and the composition of the drive system. According to different classifications of uses, Used Car can be divided into three types: Used Car, electric trucks and electric buses. 4. Except for the electric tricycles assembled by ourselves, which do not belong to the category of motor vehicles, the Used Car we buy in various 4S stores that can drive normally on the road, whether pure electric or hybrid, are all motor vehicles as long as they need to be registered. A driver's license is necessary to drive a motor vehicle. This is a necessary condition. 5. Generally speaking, non-motorized vehicles refer to vehicles driven by human power or animal power. For example, the shared bicycles we ride every day are non-motorized vehicles. But gene

With the promotion and popularization of Used Car, more and more consumers have begun to accept and recognize them. For many people, how to save power in Used Car is of great concern, so let me give you a brief introduction. Learn how to save energy in Used Car. 1. Used Car have many advantages, such as zero emissions, low noise, good acceleration performance, zero energy consumption at idle, more economical maintenance and use, etc. Used Electric Car are mainly driven by batteries. Under normal circumstances, they need to be charged to maintain power. The question that consumers are more concerned about is: how to use it to save power, or what good driving methods can save power? 2. If you want Used Car to save power, you must make good predictions and remember to brake less. Applying the brakes is to control excessive vehicle speed, but during the braking process, battery consumption will be accelerated. Therefore, in order to reduce power consumption, when you need to slow down, you should try to brake as little as possible and judge the distance in advance, so as to save power. 3. Avoid too low tire pressure. Too low tire pressure will increase the tire contact area, thereby increasing rolling resistance. Moreover, when the temperature is low in winter, the gas in the tire expands and contracts with heat. From summer to winter, even if the tire is not punctured, The tire pressure must be lowered. It is recommended to replenish it appropriately before winter every year until the tire pressure reaches the value marked on the car. 4. Air conditioning can increase comfort during driving, but it is also accompanied by a decrease in cruising range. When driving

Used Car refer to Used Car with a speed below 50 km/h. With the development of science and technology, more and more Used Car are appearing on the road. So are there any regulations for Used Car on the road? Let me introduce it to you today. 1. Used Car include electric sightseeing vehicles, electric golf carts, electric patrol vehicles, electric sanitation vehicles, electric transport vehicles, electric tractors, electric engineering vehicles and specially modified Used Car. You must have a driver's license to drive on the road. The performance of Used Car is inevitably related to the quality of batteries, electronic controls, motors and chargers. 2. Used Car have the advantages of convenience, saving money, and no pollution, and are deeply loved by the people. Used Car can have insurance licenses and insurance. Motor vehicle license plates still depend on local policies. Whether you buy an Used Electric Car online or offline, be sure to understand the local information policies. 3. The price of Used Car mainly depends on the model and configuration. The prices quoted for different models and configurations are also different. In addition to knowing the price, after-sales is also a very important issue. It is recommended to look for a well-known domestic brand, which also has guaranteed after-sales. Relevant personnel said that whether these Used Car can obtain license plates depends on whether the vehicles have relevant procedures and whether the Used Electric Car manufacturer is on the motor vehicle plate announcement list. According to regulations, when driving a motor vehicle on the road, you should hang a motor vehicle license plate, place an inspection mark and an insurance mark, and

After picking up a new car, you must recharge it in time to keep the battery fully charged. In order to avoid damaging the battery, over-discharging, under-charging and over-charging are prohibited during use. Charge it promptly on the day after use, and it shall not exceed 3 days at most. When using an Used Car, it is forbidden to slam on the accelerator (throttle) and the speed should be increased slowly, otherwise it will seriously affect the battery life or even burn out the motor. In daily use, Used Electric Car should try not to travel to the maximum mileage. The optimal mileage is 1/3--2/3 of the longest mileage. (For example, for a car with a maximum driving range of 150km, it is best not to exceed 100km in daily use. This can greatly extend the service life of the battery and reduce the cost of battery use.) When an Used Car is not in use, the battery needs to be fully charged and stored, and recharged once a month to avoid long-term power loss leading to sulfation of the battery plates. The charger used with the vehicle must have sufficient accuracy and stable voltage and current performance and pass the company's technical testing and certification. It is strictly prohibited to use chargers with poor quality, low price and poor aging resistance, otherwise the battery will be damaged. The battery shall not be placed in a sealed container, shall not be near an open flame, shall not be thrown into a fire or immersed in water, and shall not be exposed directly to the sun. Gel batteries are acidic solutions. If they come into contact with skin or clothing, they must be rinsed with clean water immediately. The ambient tem

In winter, Used Car should also undergo corresponding seasonal maintenance and adjustments to ensure normal operation and driving. Otherwise, it is impossible for Used Car to "not catch a cold" when driving in "short clothes" in winter. Winter is very cold. In January, the average daytime temperature can reach about minus 4 to 5 degrees Celsius, and the night temperature can reach as low as minus 10 degrees Celsius. However, the climate in summer is very hot, with temperatures reaching 40-50°C under the sun at noon, and heavy rains often occur. The climate and temperature changes vary greatly throughout the year. Even in order to maintain body temperature, people have to change clothes to protect themselves. In this environment, corresponding seasonal maintenance and adjustments should also be made to ensure normal work and driving. Otherwise, wearing it in winter It is impossible to "not catch a cold" when driving an Used Electric Car in "short dress". Cars are made of iron through precision machining. They are driven by the engine through the tight coordination of the various components. Its design normal operating temperature is around 90°C. At this time, the matching accuracy after the expansion of the piston and crankshaft is It's just right. If the gap between the moving parts is too small at low temperatures, the wear will be great. During cold start in winter, the temperature is extremely low and the wear will be more severe. Moreover, it will also take a long time to heat up from below 0°C to the normal 90°C, so The amount of wear is the greatest of the year. Furthermore, after parking at night in winter, the lubricating oil sinks to the bottom of the oil. Since low temperature directl

1. After picking up the new car, the battery must be recharged in time to keep the battery fully charged. In order to avoid damaging the battery, over-discharging, under-charging and over-charging are prohibited during use. Charge it promptly on the day after use, and it shall not exceed 3 days at most. 2. It is forbidden to slam on the accelerator (throttle) when using an Used Car. The speed should be increased slowly, otherwise it will seriously affect the battery life or even burn out the motor. 3. In daily use, Used Electric Car should try not to travel to the maximum mileage. The optimal mileage is 1/3--2/3 of the longest mileage. (For example, for a car with a maximum driving range of 150km, it is best not to exceed 100km in daily use. This can greatly extend the service life of the battery and reduce the cost of battery use.) 4. When the Used Car is not in use, the battery needs to be fully charged and stored, and recharged once a month to avoid long-term power loss leading to sulfation of the battery plates. 5. The charger used with the vehicle must have sufficient accuracy and stable voltage and current performance and pass the company's technical testing and certification. It is strictly prohibited to use chargers with poor quality, low price and poor aging resistance, otherwise the battery will be damaged. 6. The battery shall not be placed in a sealed container, shall not be close to an open flame, shall not be thrown into a fire or immersed in water, and shall not be exposed directly to the sun. 7. Gel batteries are acidic solutions. If they come into contact with skin or clothing, they must be rinsed with clean water immediately. 8. When chargi

The Used Car driving in the streets are very eye-catching. Many customers are confused when buying Used Car. They don`t know what to base their judgment on and what characteristics they should choose from. The author below will teach you how to choose an Used Electric Car. Just grab 5 points and start negotiating the price based on these points: 1. Accessible to the car: The main consideration is that the user has limited mobility and can move in a smaller space. 2. Automatic braking: Mainly considering the user's reaction speed and hand and foot coordination, the brake can be braked by releasing the switch. 3. Larger power: Mainly considering the degree of climbing to prevent the car from rolling away at the start. 4. Slow speed: The main consideration is that if the speed is too fast, the user will easily slip off the car when encountering obstacles. 5. Standard voltage: 24V. This is an international practice. Of course, technology updates and whether there will be any changes in the future remains to be verified. For users who don`t know, you must judge whether the Used Electric Car you buy is an authentic product based on the above characteristics. Now some manufacturers use the configuration of electric bicycles to modify them. It is difficult to distinguish from the appearance. You must look at the characteristics of the product. In addition, if the price is low, don`t buy it to avoid being cheated. Try to choose an Used Electric Car manufacturer with its own research and development patents. Only such Used Car can have good performance and guaranteed after-sales service.

The current economic reforms are moving from Made in China to Development Created by China. The chic Used Car running on the road are the new highlights. These Used Car with novel designs and unique shapes are deeply loved by the elderly. Used Car are popular among the elderly. A powerful Used Electric Car is a good tool for picking up children and traveling around. If you see such an Used Electric Car on the road, you can give it a thumbs up. If the driver sees it, he will be very happy. Of course, your praise is also for the sake of improving air quality. When Used Car are exposed to rain or water, their batteries, motors or controllers may fail, and sometimes even the entire vehicle may be "paralyzed". The motor and controller are most likely to be damaged by water in an Used Electric Car. It is recommended that you do not use an Used Electric Car on rainy days. When wading, special attention should be paid to the depth of water accumulation. Only when the depth of the water does not exceed one-third of the wheels of the Used Electric Car can it drive normally. In heavy rainstorms, it is best not to use Used Car. Important parts of Used Car such as motors, controllers, and batteries have been waterproofed. Generally, it doesn't matter if Used Car get wet by rain, but this does not mean that Used Car can "walk" through water at will. Water will also enter when you are exposed to rain. Generally, the waterproof performance of an Used Electric Car will decrease after one or two years of riding. If it is parked in the open air and encounters a heavy rain, water will enter the important parts. For minor water intrusion, just ventilate and dry it. If it is more serious, you need to come to a maintenan

Nowadays, more and more people are using Used Car, and our company is a manufacturer specializing in the production of electric vehicles. Today our company would like to introduce to you how to maintain the batteries of Used Car in daily life. In daily life, you should always check whether the connection between the poles and the terminals is reliable. In order to prevent the oxidation of the terminals, you can apply protective agents such as Vaseline; the air holes on the battery cover must be unobstructed, because the battery will produce a large amount of electricity when charging. If the vent hole is blocked, the gas cannot come out. When the pressure increases to a certain level, the battery case will explode, which is quite dangerous; short circuit testing cannot be used directly. Check the power of the battery, which will be bad for the battery; when the electrolyte inside the battery is too low, you need to add distilled water or special lead-acid battery replenishing fluid. Do not add drinking pure water instead; when using an electric vehicle When operating, you need to lightly step on the accelerator pedal, otherwise the instantaneous large current discharge will damage the battery; the battery needs to remain saturated at all times, so as to maintain the service life of the battery. According to national regulations, Used Car can only be driven on prescribed roads or venues. Since the country has no clear regulations on the penalties for Used Car on the road, the police will generally educate and warn parties who drive such vehicles on the road after discovering them. When automobile exhaust emissions become the main source of atmospheric pollution, Used Car emerge alon

Charging and driving of Used Car. Used Car have become a popular travel trend. What issues should we pay attention to when charging and driving Used Car? Let`s analyze it together, mainly reflected in the following five points: 1. Before using an Used Electric Car, you should pay attention to check whether the vehicle is in good condition, such as whether the tire pressure is sufficient, whether the front and rear brakes are sensitive, whether there are any abnormal noises in the vehicle, whether the screws are loose, whether the battery is fully charged, etc. 2. The charger contains a high-voltage circuit. Do not disassemble it without authorization. When charging, the charger should not be covered with anything and should be placed in a ventilated place. At the same time, prevent liquid and metal particles from entering the charger, and prevent falling and impact, which may cause damage. Also take the key out. 3. Pay attention when charging. Do not use other brands of chargers when charging Used Car. The performance of each brand of charger matches the battery. Only a dedicated charger can achieve the best results. 4. When an Used Electric Car is just started, it should be accelerated slowly to avoid damage to vital parts due to sudden acceleration. 5. Under the premise of ensuring safety, frequent braking and starting of Used Car should be minimized while driving to save electric energy.

Used Car are widely used in tourist attractions, pedestrian streets, leisure resorts, sanatoriums, colleges and universities, real estate development zones, sports venues, playgrounds, garden hotels, large hotels, closed residential areas, airports, train stations, docks and other places. The use of Used Car is now generally widely used by everyone. The cars we use have safety functions and are convenient to use when going out. Moreover, the number of repairs will be less and will not cause maintenance interference to our lives. This article will give you a detailed explanation. There are several benefits of using an Used Electric Car. 1. Can be used for leisure and entertainment 2. Can be used as a means of transportation 3. Can be used to take your baby to school 4. Can be used for viewing in parks 5. You can visit relatives and friends 6. Can be used for leisure and strolling 7. It can also be used for browsing and sightseeing Used Car are newly developed using automotive engineering, modern bionics and ergonomics. The curve of the front wall is simple and full, and the large-screen windshield further enhances the vehicle's majestic style. The vehicle adopts a widened design to make the interior seat space more spacious and comfortable. In addition, the beautiful and elegant instrument panel assembly of the Used Electric Car watch, coupled with the multi-functional instrument combination, makes it even more luxurious and high-end. The front and rear pillars have been repackaged and designed to match the solid and steady style of the vehicle. Equipped with a high-torque traction motor and a continuously variable electronic control

Choosing a good Used Electric Car requires not only choosing a good manufacturer, but also looking at the quality of the Used Electric Car. The development and design of Used Electric Car adheres to the people-oriented design concept and the development direction of energy conservation and environmental protection. Used Electric Car mainly have the following characteristics: 1. Energy saving and environmental protection. There is no pollution during the operation of Used Electric Car, which is conducive to environmental protection. The average running cost is one-fifth of that of the same motor vehicle. Used Electric Car can be charged at night when power usage is low, making full use of power resources and having good social benefits. Used Electric Car Adopting switching power supply charging technology, no harmful gases will be produced during the charging process. 2. Used Electric Car have a simple structure and are easy to operate and maintain. It also uses high-quality large-capacity traction lead-acid or maintenance-free batteries. The speed control system uses computer digital speed regulation, which can achieve smooth stepless speed regulation. 3. It has reverse gear driving function. Used Car have a reverse gear. It can easily realize reverse driving, which is very practical in narrow alleys and alleys. 4. Driving is flexible and convenient. Used Electric Car are small in size and can flexibly travel on narrow roads, and parking is very convenient. 5. Noiseless, Used Electric Car use high-quality DC motors with low operating noise and long service life. 6. Low operating costs. Used Car charging adopts an optimized design, which improves charging efficien

Speaking of the power problem of Used Car, in fact, the simplest way to understand it is to improve the overall performance by increasing the wattage of the generator of the car itself and increasing the capacity of the battery. Under normal circumstances, 2200W motors are basically used in plain areas. You can drive normally. But in some places, such as Sichuan and other mountainous areas, where there are many slopes and steep slopes, power is increased by increasing the power of the motor. Basically, mountainous areas use 3500-watt AC motors or 4000-watt AC motors. , only in this way can the power be more powerful on mountain roads and slopes. Otherwise, it will be very difficult to climb hills, and if a smaller motor is used, it will cause consequential damage to the controller and other components. Nowadays, Used Electric Car basically use x8 fiberglass models, which have very good resistance to impact. Moreover, the braking system has been enhanced to a four-wheel braking system, with front disc brakes and rear drum brakes, which is also very good in terms of safety. protection. Compared with traditional four-wheel Used Car, Used Car reduce exhaust emissions and greatly reduce greenhouse gas emissions, which has very good advantages for products. Therefore, the cleaning of Used Car is also particular. It is best to use special cleaning agents for cleaning. Do not use organic solvents such as thinner, gasoline or windshield washer for cleaning. The main dirt on the ceiling of Used Electric Car is floating ash. If these floating ash are not removed in time, they will adhere to the ceiling under the action of water vapor in the air, making the ceiling feel gray. Freque

(1) The Used Electric Car is completely out of power ① Check whether the battery has output wires and whether the terminals are open and soldered. ② Check whether the fuse holder is good or not. ③ Check whether the power lock is in good condition. (2) Used Electric Car do not run when powered ① Check whether the Used Car battery output is normal. If the output is too low, it means the battery is bad. The battery needs to be replaced urgently. ② Unplug the brake cable. If the car rotates, it proves that the handle is broken and the handle must be replaced or repaired. Use a meter to check whether the handle is normal. ③Check the steering wheel and use iron wire to short-circuit the steering wheel and the signal line. If the car rotates, it proves that the steering wheel is broken and needs to be replaced or repaired. Turn on the power, turn the knob, and use a multimeter to measure the positive and signal wires. ④If the controller is good or bad, you can use the positive 5V short circuit of the handlebar wire. If the handlebar rotates, it means there is no problem with the controller. The easiest way is to smell the controller to see if there is a burning smell. If there is, it proves that the controller is bad. ⑤ Check the quality of the motor. Improper contact of the carbon brushes of the motor may also cause the brush to not move.