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HANNOVER, GERMANY - April 22, 2024
BG Motor is making waves at Hannover Messe 2024 with the launch of their groundbreaking new DC brushless motor. This innovative product boasts impressive performance capabilities while maintaining remarkably low noise levels, making it ideal for a wide range of applications.


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Power Meets Quiet Operation
Engineered for exceptional performance, BG Motor's new DC brushless motor delivers the power needed for demanding tasks. Whether you require consistent operation in industrial settings or smooth, precise control for robotics, this motor is built to exceed expectations.
But power isn't everything. BG Motor understands the importance of noise reduction in today's environments. Their innovative design ensures the motor operates with minimal noise output, creating a quieter and more comfortable work experience.

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Experience the Innovation at Booth E61/1, Hall 6
BG Motor invites visitors at Hannover Messe to explore the new DC brushless motor firsthand. Head over to their booth located in Hall 6, Stand E61/1 to witness this remarkable technology in action.
The BG Motor team is eager to answer your questions and discuss how this new motor can revolutionize your projects.

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Join the Crowd - Witness the Future of Motors
Don't miss this opportunity to experience the future of motors. Visit BG Motor at Hall 6, Stand E61/1 and see for yourself why this new DC brushless motor is taking Hannover Messe by storm.

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A Partnership Powered by Shared Vision
As a seasoned motor manufacturer, BG Motor has consistently strived to provide global customers with high-quality, high-performance motors and solutions. The visit of our esteemed South American partners marks a pivotal moment in our collaborative journey.


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During the insightful meeting, we engaged in comprehensive discussions on:
1、Exploring collaborative models that encompass product development, manufacturing, and market promotion


2、Tailoring customized motor product development to meet the specific needs of the South American market


3、Devising joint strategies to expand our footprint and solidify our presence in the South American market

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Both parties expressed unwavering confidence in the strength of our partnership and the immense potential that lies ahead. Through this strategic alliance, BG Motor and our South American partners are poised to conquer new heights of success, empowering our customers with innovative motor solutions that drive progress.

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BG Motor: Your Trusted Motor Experts
BG Motor remains committed to forging long-lasting partnerships with global collaborators, ensuring that our customers receive exceptional products and services that exceed expectations. We extend a warm invitation to join us in shaping a brighter future together.

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Contact Us
If you are interested in becoming a BG Motor partner, we welcome you to connect with us.
DC Brushed Motor
CONTACT INFO
No.2986 Tiantong South Road, Yinzhou District, Ningbo City, Zhejiang Province, China.
Tel: +86 574 8813 9803
Fax:+86 574 8813 4803
Email: support@us.bg-gudemotor.com
WhatsApp/M: +86 135 6603 3299

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1. Magnetic material: ferrite


Ferrite, also known as ferrite or magnetic porcelain, belongs to non-metallic magnetic materials. It is a composite oxide (or orthoferrite) of magnetic ferric oxide and one or more other metal oxides. Metal oxides with ferrimagnetism, the magnetic force is usually 800-1000 Gauss.
In terms of electrical properties, the resistivity of ferrite is much larger than that of single metal or alloy magnetic materials, and it also has higher dielectric properties. The magnetic properties of ferrite are also shown to have higher magnetic permeability at high frequencies. Therefore, ferrite has become a widely used non-metallic magnetic material in the field of high frequency and weak current. Due to the low magnetic energy stored in the unit volume of ferrite, the saturation magnetic induction (Bs) is also low (usually only 1/3 to 1/5 of pure iron), which limits its use at low frequencies that require higher magnetic energy density. It can be applied in the field of strong electricity and high power.


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2. Magnetic material: NdFeB


NdFeB permanent magnet material is a permanent magnet material based on the intermetallic compound Nd2Fe14B. The main components are rare earth elements neodymium (Nd), iron (Fe), boron (B). Among them, the rare earth element is mainly neodymium (Nd). In order to obtain different properties, it can be partially replaced by other rare earth metals such as dysprosium (Dy) and praseodymium (Pr). Iron can also be partially replaced by other metals such as cobalt (Co) and aluminum (Al). The content of boron is small, but it plays an important role in the formation of tetragonal crystal structure intermetallic compounds, making the compounds have high saturation magnetization, high uniaxial anisotropy and high Curie temperature.
NdFeB is a high-performance rare earth material with high coercive force and high magnetic energy product, and the continuous improvement of this material in recent years has increased the use temperature and reduced the cost of the material. Applying NdFeB rare earth permanent magnet materials to the development of various motors can significantly reduce the quality of the motor, reduce the size of the motor, and obtain high-efficiency energy-saving effects and improve the performance of the motor.


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3. The difference between the two


The advantages of NdFeB are high cost performance and good mechanical properties; the disadvantages are that the Curie temperature is low, the temperature characteristics are poor, and it is easy to pulverize and corrode. It must be improved by adjusting its chemical composition and adopting surface treatment methods. , in order to meet the requirements of practical applications.


Ferrite is a metal oxide with ferromagnetic properties. In terms of electrical properties, the resistivity of ferrite is much larger than that of metal and alloy magnetic materials, and it also has higher dielectric properties. The magnetic properties of ferrite are also shown to have higher magnetic permeability at high frequencies. Therefore, ferrite has become a widely used non-metallic magnetic material in the field of high frequency and weak current.


NdFeB belongs to the third generation of rare earth permanent magnet materials. It has the characteristics of small size, light weight and strong magnetism. It is the magnet with the best performance and price ratio at present. The advantages of high energy density make NdFeB permanent magnet materials widely used in modern industry and electronic technology. In the state of bare magnets, the magnetic force can reach about 3500 Gauss.


Ferrite, also known as ferrite or magnetic porcelain, belongs to non-metallic magnetic materials, and is a composite oxide (or ferrite) of magnetic ferric oxide and one or more other metal oxides. The magnetic force is usually 800-1000 gauss, and it is often used in speakers, speakers and other equipment in addition to motors.


The general differences between NdFeB magnets and ferrite magnets are as follows:


( 1 ) The magnet performance of ferrite is poor, and the magnetic performance of neodymium iron shed is about 3 times that of ferrite.


( 2 ) In terms of price, the price of ferrite is much cheaper than that of NdFeB magnets.


( 3 ) NdFeB magnets have good temperature resistance, but demagnetization will occur if the working temperature exceeds a certain level. Therefore, it is recommended to choose a grade with a higher coercive force in a high-temperature working environment.


( 4 )The stability of ferrite is very good. It is an oxide itself, which is very stable. NdFeB is an alloy, and it is easy to oxidize, so it must be protected by coating.


Therefore, usually in the case of meeting the performance requirements of the motor, it is also necessary to consider better meeting the requirements of high cost performance. BG Motor's technical engineer team and business team will combine your requirements to customize and recommend suitable magnetic materials for you. Usually, brushless DC motors will choose high-performance NdFeB magnetic materials, and brushed DC motors will choose ferrite materials that are more economical; If some customers think that the control system of DC brushless motors is troublesome, we still The structure of the brushed DC motor can be customized, and the NdFeB magnetic material can be used, so that the torque of the motor can be larger, and it is easy to operate and use.

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The brushless DC motor is developed on the basis of the brushed DC motor. It has the advantages of stepless speed regulation, wide speed regulation, strong overload capacity, good linearity, long life, small size, light weight and large output. It solves a series of problems existing in brushed motors, and is widely used in various fields such as industrial equipment, instrumentation, household appliances, robots, and medical equipment. Because brushless motors do not have brushes for active commutation, an electronic commutator is required for commutation. What the brushless DC motor driver accomplishes is the function of this electronic commutator.


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Mainstream control methods of brushless DC motors:


Now there are three main types: FOC (also known as vector frequency conversion, magnetic field vector directional control), square wave control (also known as trapezoidal wave control, 120° control, 6-step commutation control) and sine wave control. So what are the advantages and disadvantages of each of these three control methods?


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Square wave manipulation:


The square wave control uses a Hall sensor or a non-inductive budget algorithm to obtain the position of the motor rotor, and then commutates 6 times (one commutation every 60°) within a 360° electrical cycle according to the rotor position. Each commutated azimuth motor outputs a force in a specific direction, so it can be said that the azimuth accuracy of square wave manipulation is electrical 60°. Because the phase current waveform of the motor is close to a square wave under the control of this method, it is called square wave control.
The advantage of the square wave control method is that the control algorithm is simple, the hardware cost is low, and a high motor speed can be obtained by using a controller with ordinary functions; the disadvantage is that the torque fluctuation is large, there is a certain current noise, and the power cannot reach the maximum value. . Square wave control is suitable for occasions that do not require high motor rolling function.


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Sine wave manipulation:


The sine wave control method uses the SVPWM wave, the output is a 3-phase sine wave voltage, and the corresponding current is also a sine wave current. This method does not have the concept of square wave control commutation, which may be considered as an infinite number of commutations in an electrical cycle. Obviously, the sine wave control is compared with the square wave control, the torque fluctuation is smaller, the current harmonics are less, and the control feels more "delicate", but the functional requirements of the controller are slightly higher than the square wave control, and the motor power cannot be used. to the maximum value.


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FOC control:


The sine wave control completes the control of the voltage vector and directly controls the size of the current, but cannot control the direction of the current. The FOC control method can be regarded as an upgraded version of the sine wave control, which completes the control of the current vector, that is, the vector control of the motor stator magnetic field.
Because the direction of the motor stator magnetic field is controlled, the time between the motor stator magnetic field and the rotor magnetic field can be kept at 90° to achieve the maximum torque output under a certain current. The advantages of the FOC control method are: small torque fluctuation, high power, low noise, and fast dynamic response; the disadvantages are: high hardware cost, high requirements for controller functions, and matching motor parameters.


Which method is more suitable for future development?


FOC is now the best choice for efficient control of brushless DC motors (BLDC) and permanent magnet synchronous motors (PMSM). FOC precisely controls the size and direction of the magnetic field, so that the motor has stable torque, low noise, high power, and high-speed dynamic response. Because of the obvious advantages of FOC, it has gradually replaced the traditional control method in many applications, and has attracted much attention in the sports control profession.


The typical control block diagram of FOC is as follows. In order to obtain information such as the orientation of the motor rotor, the motor speed, and the current size as a response, it is necessary to first collect the motor phase current, perform a series of mathematical transformations and budget algorithms on it, and obtain a decoupled, easy-to-control response quantity. Then, the dynamic adjustment is performed according to the error between the reaction amount and the target value, and finally a 3-phase sine wave is output to drive the motor to roll.
FOC can be divided into sensored FOC and sensorless FOC according to whether the motor has a sensor or not.
Regarding the sensored FOC, because the sensor of the motor (usually the encoder) can reflect the orientation information of the motor rotor, the orientation budget algorithm can not be used in the control. Said that the control function is often required to be higher.


Regarding the sensorless FOC, because the motor does not have any sensor, the position information of the motor rotor cannot be obtained by simply reading the measurement value of the sensor. Therefore, in the control, it is necessary to collect the motor phase current and use the position budget algorithm to calculate the rotor position. Although the control of the sensorless FOC is difficult, it can prevent the risk of sensor failure, save the cost of the sensor, and simplify the wiring between the motor and the driver board. Now, non-inductive FOC is mostly used in fan occasions.




If you do not understand the content of the above article, you can directly communicate with the professional technical team of BG Motor, and they will give you the answer you want within 1 hour! Looking forward to your reply!

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Neodymium magnets can be called NdFeB magnets, which is a general term for strong magnets. The chemical formula is Nd2Fe14B, and it is one of the artificial permanent magnet materials with the strongest magnetic force so far. The material grade of NdFeB magnets is N35-N52, which can be processed into different shapes according to specific requirements, such as round, square, punching, magnetic tile, magnetic rod, convex or trapezoidal, etc. Therefore, how to distinguish between bonded NdFeB and sintered NdFeB?


In fact, both magnets are NdFeB. These two magnets are distinguished according to their production process. Bonded NdFeB magnets are formed by injection molding, and sintered NdFeB magnets are formed by high temperature heating


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1. Production process of bonded NdFeB magnets
Bonded NdFeB magnets are formed by injection molding. The density is lower than that of sintered NdFeB because it contains a resin matrix, and the density varies according to the content of the resin matrix. However, sintered NdFeB magnets are heated at high temperature through a complicated process and do not contain non-magnetic resin components. Therefore, the performance of sintered NdFeB is higher than that of bonded NdFeB.


2. Production process of sintered NdFeB magnets
Sintered NdFeB magnets are anisotropic magnets produced by powder sintering. Generally, only blanks can be produced by sintering, and magnets of various shapes need to be mechanically processed (such as wire cutting, slicing, grinding, etc.). Sintered NdFeB is a hard and brittle material that is difficult to process, so it has large losses during processing, high cost, poor dimensional accuracy, poor corrosion resistance, and the surface needs electroplating, but the advantage is high performance, which has reached more than 50M


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To sum up, the magnetic properties of bonded NdFeB magnets are relatively low, isotropic bonded magnets are usually below 10M, while anisotropic bonded magnets can reach about 16M. However, injection-molded NdFeB magnets also have their irreplaceable advantages. For example, the effective utilization rate is relatively high; the performance can be adjusted according to the needs of different products; the injection-molded magnets have high resistivity, which can effectively reduce eddy current loss and motor heating when used in the field of high-speed rotors; the sintering process is not suitable for molding complex shapes and structures products, and injection molding can easily solve this problem.


Of course, the different materials of NdFeB magnets are recommended according to the different scenarios of customers. If you are not very clear about the magnetic materials, you can contact the customer service of our official website at any time, and they will contact and recommend to you professionally.