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The factors that affect the operation of dc brushless motor
Brushless DC motor is the abbreviation of Brushless DC execution servo motor; it is a type of synchronous motor, it is means that the rotor speed was effect by the speed of rotating magnetic field of stator and rotor poles (P): n = 60 * f / P . Under the circumstance of the fixed number of poles, the change of the frequency of the stator rotating magnetic field can change the speed of the rotor. Brushless DC motor is that synchronizes motor added to electronic control (drives, including the Ministry of Power and Control Division); Control the frequency of the stator rotating magnetic field and take the rotor speed feedback to the control center to correct repeated, so as to get close the way of DC motor’s characteristics. It means that among certain load, brushless motor can still control the motor rotor to maintain a certain speed when the load changes. Brushless DC micro-motor is one of them.
The main structure of dc motor
The rotation motor with the definition of output or input is direct current named the DC motor, it is a kind of motor can achieve current energy and mechanical energy DC electrical motor interchangeable. When it used for motor it was regarded as dc motor, which will convert electrical energy to mechanical energy; when use for generator, it is dc generator which convert the mechanical energy into electricity energy.
The structure of DC motor should be composed of stator and rotor two parts. When DC brush motor running, the stationary part is called the stator, and the main function of stator role is to produce magnetic field. Naturally, the rotating part of the runtime is called the rotor, and its main role is to generate the electromagnetic torque and induced electromotive force, it is called the armature because it is the hub of energy conversion.
The earliest used motor in the world
The world’s earliest Prototype motor is permanent magnet electrical motor, but because the performance of permanent magnetic materials in that time was poor, so electromagnetic motors have been accounted for the mainstream. The birth of Alnico permanent magnet made the permanent magnet motor to start the advent of development, but because of its relatively high price, the application surface of Alnico magnet motor is not widespread. Since the emergence of low-cost ferrite, the application of permanent magnet motor substantially increases. According to statistics, among DC motor below 500W, the permanent magnet motor accounts for more than 92%, most of which is ferrite permanent magnet brush motor. The emergence of samarium cobalt permanent magnet makes high-performance servo motor to be achieved.
The comparison between permanent magnet and brushless motor
The research and development of rare earth permanent magnet material played a great role in the development of the micro-motor. In the United States, Japan and Western Europe and other developed countries, Rare earth permanent magnet material’s application has accounted for more than 60% in the total sales of rare earth permanent magnet. Rare earth permanent magnet material with high remanence and coercivity and energy product and has a good dynamic response characteristics, they especially suitable for high-performance micro-motor.
Brushless DC motor is new integration micro-motor combined with electromechanical and electronic technology. It is the most promising electric motor. Because a lot of benefits for Brushless Motor.
How does electrical motor work?
When the electrical motor working, the coil and commutator rotating but magnet and brush does not turn, the turning changes of the coil current direction is completes by the motor commutator and brushes of motor rotation. There are the clarifications of sub-high-speed brush motor brush motor and low-speed brush motor in the electric vehicle industry, a lot of difference between Brush motors and brushless motors can be seen from the name, brushless motor brush without any carbon brushes.
The main components of Brush motor are stator and rotor, there are poles on the stator (windings or permanent magnet), and the rotor has windings, there will be a angle between the stator and rotor magnetic field (N pole and S pole between), under the mutual attraction of the stator and rotor magnetic field, which is the stator and rotor magnetic field. After changing the seat of the brush you can change the direation of the angle between the stator and rotor pole, so as change the direction of motor rotation.
How does brushless dc micro motor work?
The another name of brushless DC micro-motor is orthogonal systems, which is converted direct current into alternate current, AC inverter is working here in DC Chopper. Brushless DC micro-motor is the composition of synchronous motor and motor driver; it is a type of typical mechatronic product.
Brushless DC micro-motor position sensor code to power the two-phase winding axis position ahead of the resultant magnetic field axis of the rotor position of the magnetic field, so wherever the starting position of the rotor is, the motor in starting moment will produce large enough starting torque, thus it is unnecessary to stall start winding. Brushless DC micro-motor overcomes the congenital defects of brush DC Micro Motor, to take electronic commutator to replace the mechanical commutator.
Electric bicycle uses brushless motor will reduce the efficiency
Currently the motors being used by electric bicycles manufacturers generally are brushless gearless motor. The cost of its speed control system should be higher than the cost of brush motor speed control system, but the brushless motor controller is easy to break during the using process. Electric bicycle equipped with a brushless motor can play its best efficiency when the speed up to 35 km / h or the above, But as we also know electric bikes are managed as motor non-vehicles, thus their driving speed must below 20 km / h, therefore it will reduces the efficiency when brushless motor was selected by electric bikes. The main reason why it is used is because of the low noises, brushless motor uses electronic circuit for commutation! There will be detection device to detect the polarity!
Economic type Permanent Magnet DC Motor
High-performance form and economic form are the two major development directions of Permanent Magnet DC brush motor, the so-called economic type mainly refers to the micro dc motor stereo audio-visual equipments used, such as various tape recorders, video recorders, music centers, record players, music players, radios, CD player, digital laser player and car audio and more. The features is the number is huge and the price is very cheap, each one just worth a few dollars each. Mabuchi of Japan is the world's most productive economic Permanent Magnet DC Motors Company, the annual production evenly up to bullions of sets. However, due to appreciation of the yen, Japan domestic basically stopping product this electrical motor, most of them are transferring to mainland China and Southeast Asia.
Loving a Person Quietly
Would time really dilute everything? I did not believe. If it took my lifetime to forget a person, I would like not to forget him. He had injured me so deeply, but I did not hate him at all. When he did not want to speak a word to me, my heart was broken. I rode my electric hub motor bicycle to the river bank and shouted cried loudly. I complained myself and did not put blame on him, because it was not his fault. It was me who had loved him willingly. I was not lucky enough to get married with him. He had bought me the best electric bicycle and done everything he could do for me. I should have been content. Although I could not accept the fact of his unfeeling to me and was very sad at the beginning, I have decided to love him quietly. I would never forget Velineon 3500 brushless motor he bought me and treasure it very much in the depth of my mind. I thought love did not mean meet or kiss or call each other. I could not meet him and call him anymore, but I loved him deeper than before.
What is Permanent magnet brushless dc motor?
Permanent magnet brushless DC motor is dc motor that establish by one or more blocks of permanent magnet. Its performance is resembled with excited DC motor, which can though the method of changing the Armature voltage to change the speed. In comparison of excited DC motor, it equipped with smaller size, higher efficiency, more simple structure and less copper etc. advantages. Permanent magnet brushless DC motor is the main type of small power DC motor.
In the light of different materials used, permanent magnet brushless DC motor is divided into Alnico permanent magnet DC motor, ferrite and rare earth permanent magnet DC motor permanent magnet DC motor. Alnico permanent magnet brushless DC motor requires consume large amounts of precious metals, the price is dear, but it is adaptable to high temperature.
What is motor controller?
Motor controller the device that serves to govern in some predetermined performance of motor. Motor controller include manual or automatic means for starting and stopping the motor, selecting forward or reverse rotation, selecting and regulating the speed, regulating or limiting the torque, and protecting against overloads and other mistakes. Every set of electric motor must have some sorts of controller. The motor controller will have difference features and complexity depending on the task that the motor will be performing.
Complex controllers motor maybe accurately controls the speed and torque of the connected motor. For example, a numerically controlled lathe will accurately position the cutting tool according to a preprogrammed profile and compensate for varying load conditions and perturbing forces to maintain tool position. Servo motor controller belongs to complex motor controller.
There Was a Pay, There Was a Gain
There was no reason to love a person. We would hope that he has a good mood every day and we would be also happy if he was happy. Take me for example, I had fallen in love with him for two years and I did not hope he had any unhappy thing and if he had, I would want him to tell me and I would give him spiritual comforts. He forgot his Sw 12v dc motor controller home one time and I rushed to the house to take it for him as quickly as possible. I could run errands for him except giving him comforts. I wished he was happy all the time. This was love, and I could not tell about clearly. He bought me electric bike motor kits and an electric car one day. I got a shock and had never thought he would give me a present. I was flattered. He said that in order to praise my good performance in work and hoped me to continue to carry forward, he awarded me the watch. It was the best electric bike and the best gift I had received. I would cherish it and cherish the time and cherish him.
The types of Electric motors
Electric motors generally are DC motor; they have permanent and without permanent magnet classification, dc motor have permanent magnet motor and series motor two types. The rotating part of Motor called the rotor, and the non- rotating part is called the stator. The rotor or the stator of Permanent magnet motor has a permanent magnet, the other one is enameled wire wound package; among the same power motors, permanent magnet motor is power-saving than the series motor. The magnet of permanent motor magnet fear of high temperature, as to poor quality product, it will demagnetization at 110 degrees; series motor without permanent magnets, so it without this kind of problem. It is worth mentioning that series motors belong to brush motors.
The speed of electric bicycle motor
The electric bicycle motor we see commonly called hub motor, there can be loaded spokes and rim, the spokes have not installed the brush motor and other vehicles made one circle, which is also called the integration of the industry hub motor, the impact of the former is good, which is favorable to the electrical motor. The General motor with speed of 3000 r / min or higher is called high-speed motor, the speed of motor below 1000 r / min known as low-speed motor. Currently, there are brush gearless hub motor can reach 600 r / min or less. The speed of household electric bicycles requires less than 20 km / hour, converted into 24 (inch) bicycle about 200 r / min; you can use small gear to slow down the driving speed. The gear can be installed in the motor and can also be mounted on the outside of the motor.
Everything Was Possible
Echo was an ordinary girl living in the village and born in a poverty family. Echo thought she was not as cool as other girls, and when she saw people riding brushless motor electric car in the streets, she admired them very much. In her opinion, only rich people could afford an electric car and she could not imagine what she would be like when she rode a dc brushless motor electric car. Will she also be cool like them? Echo was not pretty, but she had her own personality. In addition, Echo was talented in music and her dream was to become a singer. Under the cultivation of her music teacher, and her hard-working, she took part in a lot of singing contests and gained many awards. She became rich when she was twenty seven years. Her dream came true. She bought the best electric bike and rode it to visit her friends and her relatives and all of them praised that she was a capable girl and did not let her parents down and had earned glory for them.
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