The inventors of the brushless motor are the German theoretical physicist Ian Kolander Rayor (Ernstwerner Siemens) and the doctor Angel Delfuri (Angel of austodori). As early as the 1860s, the German physicist Rayor began to study the working principle of the motor.In 1886, the first practical DC motor that could operate at a constant speed at a variable weight was introduced. FrankJulianSprague was its inventor, and it was this motor that provided the catalyst for the widespread use of electric motors in industry.In 1949, Slovak engineer Emil Petrash invented the first brushless DC motor, which used the principle of reversing alternating current to achieve uninterrupted rotation. This marked the beginning of the era of brushless motors.The practical motor adopts brushless form, that is, ac-flow squirrel cage asynchronous motor, which not only eliminates the spark and voltage loss at both ends of the winding, but also can transmit power at a constant speed. However, the asynchronous motor has many insurmountable defects, so that the development of motor technology is slow.By the 1960s, the American electrical engineer Terry Laikin invented a three-phase brushless motor with strong magnetic force and efficient performance (the phase of the three-phase motor refers to the coil winding in the motor, three phases and three windings. Specifically, it includes three phases, that is, phase A, phase B and phase C. The three-phase motor uses the three-phase power supply as energy, and generates a rotating magnetic field through three independent coils to drive the motor to rotate). This innovation broke the working principle of the traditional motor and was hailed as a revolutionary breakthrough in the history of the motor, and Terry Laikin became the father of the brushless motor. Since its invention, compared with the brushless motor, the brushless motor has low noise, lower maintenance cost, more reliable performance, lower failure rate, better external characteristics, small no-load current, wide speed range and other characteristics, since the 1960s, Europe, Japan, South Korea and other countries and regions have carried out research on brushless motors. And in aerospace, robotics, consumer electronics and other fields of application. At present, China has also become one of the major countries in the production and application of brushless motors in the world. 

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Adjusting the speed of the brushless DC motor can be achieved in the following ways: 1. Regulating voltage:The input voltage of the motor is adjusted by changing the output voltage of the driver, thus changing the speed of the motor.2.PWM speed regulation:Using pulse width modulation (PWM) technology, the constant DC supply voltage is modulated into a pulse voltage sequence with fixed frequency and variable width.By changing the duty cycle of the PWM (that is, the time ratio of the high level to the low level), the average output voltage can be adjusted to change the speed of the motor. 3. Series resistance speed control:A potentiometer is connected in series in the motor circuit to adjust the speed of the motor by changing the size of the resistance.This method is suitable for low power motors, but is less cost-effective for high power motors due to the need to find a high power resistor with the right resistance value.4. Change the power-on sequence:For the case that the steering needs to be changed, it can be achieved by changing the order of the power-on of the phases.For example, the running direction of the motor can be controlled by connecting terminal dir and terminal com.                                                                                                                 

According to relevant information, the pace of life continues to accelerate.Today, around 75% of the world's population is suffering from "sub-normal" disease. With the development of the national economy and living standards, people have also begun to pay attention to their own  health question. Massage health care is a traditional Chinese skill, it is through non-drug ways to help us get rid of the "sub-health" state. Modern medical research has proved that circular massage on special acupoints is effective.Such as our respiratory system, digestive system, nervous system and blood circulation. The ring system has the function of maintaining and improving disease resistance and can help us get rid of the "sub-health" problem as soon as possible. There are two main ways of health care, one is manual massage, the other one is automatic instrument massage, such as electric massage chair. Be compared to Manual massage, automatic machine massage with its low cost, action handIn recent years, the diversity of law and other characteristics have been welcomed by more and more people.In the automatic massage equipment, the electric massage chair is the most popular one a kind of massage machine.At present, most of the popular electric massage chairs in the market are using Brush DC motor due to its mature structural design, Simple control, cheap price and other characteristics. It has been widely used. With the popularity of motor massage chairs in the market, the disadvantages of brush motors also gradually emerged, such as running noise problems, motor life questions. The problem of electromagnetic radiation generated by the motor rotation process and so on. For structural reasons of brushed DC motors, these problems cannot be solved completely. For example: brush DC motor electromagnetic radiation is mainly caused by the constant commutation of the internal brush and commutator blade during commutation, and the brush and commutator blade are an essential part of the brush DC motor, so it is accompanied by the generation of electromagnetic radiation at all times during the rotation process.Compared with the brushless DC motor, the brushless DC motor eliminates the mechanical commutation mechanism of the brushless DC motor and adopts the commutation mechanism of electronic commutation, thereby overcoming the electromagnetic radiation problem caused by the commutation of the brushless DC motor, and has the advantages of more reliable operation stability, durability and good speed regulation performance. The brushless DC motor is now used to replace the brushed DC motor, and at the same time, for the characteristics of the electric massage chair, a set of control system matching the brushless DC motor has been developed, replacing the common brushed motor on the existing market, so as to solve the problems of short life, poor reliability and electromagnetic radiation of the brushed motor. Each control circuit board is small in size, low in cost, easy to transplant to the existing massage chair system, and easy to promote.

Introduction：Brushless DC motor is a typical mechatronics product, which is composed of motor body and driver. Brushless motor refers to the motor without brush and commutator (or collector ring), also known as commutator free motor. As early as the birth of the motor in the 19th century, the practical motor produced is a brushless form, that is, the AC squirrel cage asynchronous motor, which has been widely used. However, the asynchronous motor has many insurmountable defects, so that the development of motor technology is slow. The transistor was born in the middle of last century, so the brushless DC motor using transistor commutator circuit instead of brush and commutator came into being. This new brushless motor is called electronically commutated DC motor, which overcomes the shortcomings of the first generation of brushless motors.BLDC motor The motor uses a permanent magnet as a rotor, and there is no coil in the rotor. Since there are no coils in the rotor, commutators and brushes for electrification are not required. Instead, the coil serves as the stator.   The rotor of a BLDC motor is a permanent magnet that rotates by changing the direction of the magnetic field generated by the surrounding coil. The rotation of the rotor is controlled by controlling the direction and magnitude of the current to the coil.Brushless motor structure A single brushless motor is not a complete power system, brushless basically must be controlled by a brushless controller, that is, electrical regulation, in order to achieve continuous operation. The ordinary carbon brush motor rotates the winding, while the brushless motor rotates the magnet regardless of the external or internal rotor structure. Therefore, any motor is composed of a stator and a rotor. The stator of the brushless motor is a part of the rotating magnetic field, which can support the rotor to rotate. It is mainly composed of silicon steel sheet, enameled wire, bearing and supporting parts. The rotor is a magnet, rotating parts in the stator rotating magnetic field, mainly composed of rotating shaft, magnet, support parts. In addition, the number of magnetic poles composed of the stator and rotor also affects the speed and torque of the motor.The front cover, middle cover and rear cover of a brushless motor are mainly integral structural components, which play a role in constructing the overall structure of the motor. However, the outer shell of an outer rotor brushless motor is also the magnetic circuit path of the magnet, so the outer shell must be made of magnetic conductive material. The outer shell of an inner rotor motor is only a structural component, so there is no restriction on the material. However, an inner rotor motor has one more rotor core than an outer rotor motor, and the function of this rotor core is also to serve as a magnetic circuit path.Magnet: It is installed on the rotor and is an important component of a brushless motor. Most of the performance parameters of a brushless motor are related to the magnet, including power, speed, torque, etc.Silicon steel sheet: It is an important component of a slotted brushless motor. Of course, a slotless brushless motor does not have silicon steel sheets, but currently the vast majority of brushless motors are slotted. Its main role in the entire system is to reduce magnetic resistance and participate in the magnetic circuit operation.Shaft: It is the direct force-bearing part of the motor rotor, and the hardness of the shaft must be able to meet the requirements of high-speed rotation of the rotor.Bearing: It ensures the smooth operation of the motor. Bearings can be divided into sliding bearings and rolling bearings, and rolling bearings can be further classified into ten categories such as deep groove ball bearings, needle roller bearings and angular contact bearings. Currently, most brushless motors use deep groove ball bearings.SummaryIn general, compared with traditional brushed motors and induction motors, brushless motors have excellent characteristics such as high speed/torque ratio, good dynamic performance, high efficiency, long life, low noise, wide speed range and easy manufacturing. Especially the power output per unit volume characteristic makes it suitable for applications where size and weight are sensitive. These excellent characteristics make BLDC widely used in industrial control, automotive industry, aerospace and other fields.

Dear ClientsAs the Dragon Boat Festival draws near, This festival is one of china's most significant celebrations.lt honors the poet Chu Yuan and is a time for health and protection. We will have holiday from May 31st to June 2nd for the Dragon Boat Festival.If you have any urgent issues,please do not hesitate to call us at+86-13353313632.We hope this festive season brings you health, joy and abundance.Best RegardsWenzhou Tuoke Drive Technology Co.,Ltd