In fact, the brushless DC motor is evolved from the original DC motor, but its driving current is AC, but it is divided into brushless speed motor and brushless torque motor. Normally, the brushless DC motor drives The current is a square wave and a sine wave, which I believe everyone is true.
The brushless DC motor is the part that converts the motor itself into electromechanical energy. At the same time, in addition to the two parts of the motor armature and permanent magnet excitation, it also carries sensors. The motor is the core part of the brushless DC motor, which is not only related to performance. Indicators, noise and vibration, reliability and service life, etc., as well as manufacturing costs and product costs. Because the permanent magnet magnetic field is used, the brushless DC motor is freed from the traditional design and structure of the general DC motor, which meets the needs of various application markets, and develops in the direction of saving copper and saving materials and making it easy to manufacture. The development of the magnetic field is closely related to the application of permanent magnet materials. At the same time, the application of the third-generation permanent magnet materials on it has made the DC brushless motor move forward in the direction of high working efficiency, miniaturization and energy saving.
In order to reduce the moment of inertia, the brushless DC motor generally adopts a "slender" structure. The weight and volume of the brushless DC motor are much smaller than that of the brushed DC motor, and the corresponding moment of inertia can be reduced to 45%—55 At the same time, due to the processing problems of permanent magnet materials, the general capacity of brushless DC motors is controlled below 100kW.
The brushless DC motor has the same working principle and application characteristics as other general DC motors, but its components are different. In addition to the motor itself, the former also has a commutation circuit, and the motor itself is closely related to the commutation circuit. The combination of the commutation circuits makes the motors of many low-power motors merge into one with the commutation circuit, but from the appearance alone, there is basically no difference between the DC brushless motor and the DC motor.
Compared with the existing products in the market, the brushless DC motor adopts a new design and research and development, the speed stability is greatly improved, the temperature rise is low, the positioning torque is relatively small, the operation is stable, the noise and vibration are very small, and the noise and vibration are very small. The advantages of lower and lower vibration and longer working life are many advantages. The products can be widely used in factory automation, pump valves, solar equipment, automotive equipment and so on.
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