Working Principle of brushless DC motor

by:V&T Technologies     2020-01-23
Due to the use of mechanical brushes, DC brushless motors have a series of problems such as mechanical friction, noise, electric spark, radio interference, etc. , coupled with high manufacturing cost and difficult maintenance, thus greatly limiting its application range. The Brushless DC Motor replaces the mechanical brush and the mechanical commutator with the electronic steering gear, maintains the excellent characteristics of the brushed DC motor, and removes the brush and commutator. Stubborn disease'. It has the advantages of simple structure, reliable performance, high efficiency, simple maintenance, etc. Brushless DC Motor is usually composed of motor body, rotor position sensor and power switch circuit. Let's look at the KV value of the brushless motor defined as: Speed/V, which means that the input voltage increases by 1 Volt and the idle speed of the brushless motor increases. Therefore, the voltage input of the brushless motor and the idle speed of the motor follow a strict and linear proportional relationship. The larger the value, the higher the voltage, the faster the speed increases, and the larger the KV value, the motor, the larger the peak current is, the better it is not. The torque will be sacrificed. The peak power will be large KV multiplied by voltage, which is equal to the number of revolutions per minute of the motor. As for whether the higher the better, of course not, the corresponding KV has the corresponding torque can be equipped with the corresponding paddle. When purchasing brushless motors, we don't understand the technical parameters here. We all have technical support in this area. For example, brushless DC motor for industrial sewing machines has the advantage of forward and reverse rotation. Fast starting and braking, high positioning accuracy, large overload capacity and low vibration, and at the same time realize three automatic control functions of automatic sewing, automatic secant and automatic line picking of industrial sewing machines. In addition, brushless DC motors can meet the requirements of high precision, high efficiency and high performance of mechanical equipment in numerical control processing equipment, industrial intelligent robots, automatic production lines, Automatic textile, packaging, metallurgy, etc. Brushless motors are also used in most light industrial machinery requiring speed and position control. The application in precision electronic equipment and instruments, such as orthopedic medical equipment, requires its power system to continuously change speed in a wide range due to the need of surgery, in order to meet the requirements of milling, drilling, sawing and other occasions. However, the existing driving motors for orthopedic medical devices are single-phase AC/DC series excited motors and voltage regulators, which have the disadvantage of high noise; Due to the existence of brush and phase changer, disinfection cannot be carried out before the operation, which has certain influence on the Operation effect; At the same time need to timing change the brush and motor maintenance. The application of brushless DC motor as the drive system has the advantages of low noise, wide speed regulation, small volume, light weight, etc. In addition, the computer is hard, applications in the fields of floppy disk drive, video recorder drum drive, laser printer, copier, satellite solar panel Drive, instrument ventilator, blood analyzer, medical monitoring equipment, etc. are gradually replacing brushes and motors. This kind of brushless DC motor is small in size and high in machining precision. It is technology intensive and has huge demand. DC brushless motor or AC brushless motor can be customized according to various specifications, please contact our company for details. Advantages of DC brushless motor: low noise design, small size, high power, rich models and long service life. Its power is 6W to 120 W, and the reduction ratio is from 1:3 to 1:2000. There are single-phase induction motors and three-phase induction motors; Continuous operation type, reversible type and braking type; There is also a permanent magnet DC Brush Motor. First, single-phase induction motor, can be continuously operated using capacitor induction motor, high power and low noise. Second, the reversible motor has the function of instantaneous conversion forward and reverse, and almost no inaccurate steering and switching occurs. Due to the balanced winding mode and the simple braking mechanism. Can instantly convert forward and reverse. Three, electromagnetic brake motor, can brake in a short time, starting at 2 ~ when no load ~ 3-turn internal brake for safe braking performance. Fourth, the speed motor, with the speed controller can adjust the speed range: 90 ~ 1400 RPM, equipped with a speed sensor inside, which implements feedback control, so the frequency of the power supply changes, and the specified number of revolutions never changes. Five, three-phase motor DC motor, with the inverter can adjust the speed of the three-phase motor; The speed of the DC motor can be adjusted by changing the electrified voltage to realize the speed regulation function. TAG brushless
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