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Brushless dc motor is relative to a brush dc motor character. A brush machine adopts mechanical commutator, to the control system request is low, relative cost less than brushless motor. But the fatal weakness is: life is short, the large noise and low efficiency. It is the long-term use of carbon brush wear serious, more easily damaged. At the same time wear produced a large number of carbon dust, these dust fall into bearing, bearing oil accelerate dry, motor noise further increase. A brush motor continuous use 500 hours (foreign best carbon brush and less than 800 hours) will need to replace motor inside carbon brush, then you will find, the motor so that as before, this is because the motor replace carbon brush, commutator also be ground out some groove, make the carbon brushless gear motor contact area reducing, bad contact of carbon brush after electrify will produce the spark and accelerate oxidation commutator and pieces of copper, lead to motor power decreases, can't even start, and issued the harsh electromagnetic acoustic.

 What this means is that a brushless motor of fewer parts that wear out and need to be replaced. With a Brushless DC motor, BLDC motor, as it can never a need on the condition of the brushes, which require, that are taken the engine out of operation and recovery could be affected. Brushless motors can just as effectively for high speed operation as brush motor, if not more, but because there no brushes to replace, a brushless can have a life expectancy of over 10,000 hours.

Brushless DC motor and DC motor has the same working principle and application characteristics, and its composition is not the same as. In addition to the motor itself, the former is a reversing circuit, a motor and a reversing circuit together. Many small power motor reversing circuit itself is associated with a synthetic one, look from the exterior of Brushless DC motor and DC motor exactly the same. Brushless DC motor itself is the electromechanical energy conversion part, which in addition to the motor armature, permanent magnet excitation two part, but also with sensor. The motor itself is a brushless DC motor core, it is not only related to the performance of vibration, noise, reliability and service life, but also relates to the manufacturing costs and the cost of the product. Due to the adoption of the permanent magnetic field, the brushless DC motor from the general DC motor of traditional design and structure, to meet a variety of applications to market requirements, and to save copper material, simple manufacture direction. Permanent magnetic field of permanent magnetic materials development and application is closely related to, the third generation permanent magnet material application, prompting a brushless DC motor to high efficiency, miniaturization, energy saving direction. In order to realize electronic commutation must have a position signal to control circuit. Early use of electrical position sensor to obtain the position signal, is now gradually electronic position sensor or other method to get the position signal, the most convenient way is to use the armature windings of the electric potential signal as the position signal. To achieve motor speed control must have speed signal. Used to obtain a position signal similar method to obtain velocity signal, the most simple velocity sensor is measuring frequency tachometer generator and electronic circuit combination. DC brushless motor commutation circuit is composed of drive and control of two parts, the two part is not easy to separate, especially low power circuits often will both integrated into a single application specific integrated circuit.

Brushless DC motor and drive by the motor body composition, is a typical mechatronics product. Brushless motor without brushes and a commutator is referred to ( or slip ring ) motor, also called motor without commutator. As early as in the last century when the motor, brushless motor is practical form, i.e. AC squirrel-cage asynchronous motor, the motor has been widely used. However, asynchronous motor has many defects that can not be overcome, so that the motor technology development is slow. The middle of the century gave birth to the transistor, and the transistor switching circuit to replace the brushes and commutator brushless DC motor will emerge as the times require. This new type of brushless motor is called electronic inverting DC motor, which overcomes the defects of the first generation of brushless motor.The utility model brushless motor and electronic technology, microelectronic technology, digital technology, automatic control technology and materials science and development are closely linked. It is not limited to the AC and DC field, also relates to electric, power conversion and signal sensing fields. In the field of new motor brushless motor breed is more, but the excellent performance of the brushless motor because of price limits, its application is not very extensive. The following are the main novel brushless motor to explore and research.

Brushless motor development in our country in a relatively short time, as technology has become more mature and perfect got swift and violent development. In the model, medical equipment, household appliances, electric cars and other fields are widely used, and in Shenzhen, Changsha, Shanghai to form a shape of industry chain. Shenzhen Albert motor \ Changsha Kodak and a number of professional manufacturers, technically continue to promote the development of the industry.Brushless motor background information : in recent years, brushless motor has become the model in the field of rapid development is a kind of power. As a result of output and price reason, the past few years brushless motor used in high-grade aviation model, now due to mechanical processing technology's rapid development, brushless motor production cost decrease, it is entered into the model field at all levels, from the electric remote control cars to electric remote control boat to electric model aircraft, ubiquitous.For the brushless motor misunderstanding: many people have seen the model using the brushless motor, they are using battery power, so a lot of people in the knowledge has been a misunderstanding, think the brushless motor is a DC motor, actually otherwise, brushless motor belongs to the AC motor, three-phase AC permanent magnet motor an input model, brushless motor 3 wire current alternating current, but this is not 50HZ alternating current electric sine wave, but from the brushless motor controller ( commonly known as brushless electric modulation ) modulation of three phase alternating rectangular wave, the frequency ratio 50HZ is much higher, and with the motor speed change.

The 1 servo system ( servomechanism ) is to make the object position, azimuth, state controlled output quantity can follow the input goal ( or value ) of any changes in the automatic control system. Servo mainly depends on the pulse to locate, basically can understand so, servo motor receives a 1 pulse, will rotate 1 pulse corresponding angle, so as to realize the displacement, because, the servo motor has a pulse function, so the servo motor rotates an angle, has a corresponding number of pulses, such, and the servo motor to accept the pulse forming echo, or closed loop, thus, the system will know sent how many pulse to the servo motor, and received a number of pulse back, so, can accurate control of motor rotation, thereby realizing the accurate positioning, can achieve 0.001mm.DC servo motor is divided into the brush and brushless motor. Brush motor has the advantages of simple structure, low cost, high starting torque, wide speed range, easy control, maintenance, and the maintenance is not convenient ( Replacement Brush ), electromagnetic interference, environmental requirements. So it can be used for cost sensitive ordinary industrial and civil cases. Brushless motor has the advantages of small volume, light weight, large output force, fast response, high speed, small inertia, smooth rotation, torque is stable. Complex control, easy to achieve the intelligent, the electronic commutation mode is flexible, can be square wave commutation or sinusoidal commutation. Motor maintenance free, high efficiency, low operating temperature, electromagnetic radiation is very small, long life, can be used in various environments. 2 AC servo motor is a brushless motor, divided into synchronous and asynchronous motor, the motor control in general with the synchronous motor, its scope of power, can do a lot of power. Large inertia, the highest rotation speed is low, and with the power increasing and the rapid decrease of. Thus it is suitable for high speed running smoothly application. The 3 servo motor is a permanent magnet inside the rotor, drive control of U / V / W three-phase electric and electromagnetic field is formed in the magnetic field, the rotor rotates under the action of the motor, at the same time with encoder feedback signal to the drive, drive according to the feedback value is compared to a target value, adjusting the rotation angle. Servo motor accuracy depends on the precision of encoder ( line number ).

Brushless DC motor and drive by the motor body composition, is a typical mechatronics product.Motor stator winding multiple made symmetrical three-phase Y connection, with the three-phase asynchronous motor is very similar. The rotor of the motor is affixed is magnetized permanent magnet motor rotor, in order to detect the polarity, in a motor with position sensor. Drive by power electronic devices and integrated circuit components, its function is: accept motor start, stop, brake signal, in order to control motor's start, stop and brake; accept the position sensor signal and a normal-reverse signal, used to control the inverter the power tube on-off, continuous torque; accept the speed command and velocity the feedback signal, used to control and adjust the speed; provide protection and display etc..As a result of Brushless DC motor with automatic operation, so not as variable frequency speed control of heavy load starting of synchronous motor in rotor plus the start winding, nor in the mutation load is generated when oscillation and.Small brushless DC motor permanent magnet with high energy product, now uses the rare earth neodymium iron boron ( Nd-Fe-B ) material. Therefore, the rare earth permanent magnet brushless motor volume than the same volume of three-phase asynchronous motor narrowing of a frame.Come nearly thirty years for asynchronous motor variable frequency speed control research, in the final analysis is looking for control asynchronous motor torque method, rare earth permanent magnet brushless DC motor is bound to its wide speed, small volume, high efficiency and steady speed error is small wait for a characteristic in the control field is showing its advantage.Brushless DC motor with brush DC motor characteristics, but also the frequency changing device, so that a DC inverter, the international generic noun BLDC. Brushless DC motor operation efficiency, the torque at low speed, speed precision than any control technology of converter drives, so worthy of concern. This product has production with over 55kW, can be designed to 400kW, can solve the industry of energy saving and high performance driving demand.

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the permanent magnet brushless DC motor in the application should pay attention toTags: China electric motor manufactures  

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