Como funciona um motor DC sem escova?

Brushless DC motorsare common in industrial applications worldwide. No nível mais básico, existem motores de escova e escova, bem como motores CC e CA. Você pode pensar que um motor DC sem escova não contém pincéis, mas usa corrente CC. Compared with other types of motors, these motors have many specific advantages, but fundamentally speaking, what exactly is a brushless DC motor? How does it work and what is its purpose?

This passage is going to talk about the followings of brushless DC motor:

(1) The working principle of brushless DC motor

(2) What are the uses of brushless DC motor?

(3) Select the best motor

The working principle of brushless DC motor

It usually helps to explain the working principle of a brushed DC motor because it has been used for a while before thebrushless DC motorestá disponível. The brushed DC motor has permanent magnets on the outside of its structure and a rotating armature on the inside. The permanent magnets fixed on the outside are called stators. The armature that rotates and contains electromagnets is called a rotor.

In a brushed DC motor, when current flows to the armature, the rotor rotates 180 degrees. To advance further, the magnetic poles of the electromagnet must be reversed. When the rotor rotates, the brushes come into contact with the stator, which reverses the magnetic field and makes the rotor rotate a full 360 degrees.

Brushless DC motors actually flip from the inside out, so there is no need to use brushes to flip the electromagnetic field. In a brushless DC motor, the permanent magnet is located on the rotor and the electromagnet is located on the stator. The computer then charges the electromagnet in the stator to rotate the rotor 360 degrees.

What are the uses of brushless DC motor?

The efficiency ofbrushless DC motorsis usually 85-90%, while the efficiency of brushed motors is usually only 75-80%. The brushes will eventually wear out, sometimes causing dangerous sparks, thus limiting the service life of the brushed motor. Brushless DC motors are quiet, light, and have a longer service life. Because the computer controls the current, the brushless DC motor can achieve more precise motion control.

Because of all these advantages, brushless DC motors are usually used in modern equipment that requires low noise and low heat, especially in equipment that runs continuously. This may include washing machines, air conditioners and other consumer electronics products. They may even be the main power of service robots, which will require very careful control of force for safety reasons.

Compared with other types of motors, brushless DC motors have several obvious advantages, which is why they have entered many household products, and may be the main factor in the development of service robots inside and outside the industrial field.

Se você acha que seu aplicativo pode se beneficiar dessa tecnologia, procure a lista de fornecedores e integradores de motor sem escova.

Selecione o melhor motor

Finalmente, vamos falar sobre o que procurar ao escolher um motor. A característica mais importante é o motor elétrico KV. O motor com uma tensão de 2000kv por volt entregue ao motor girará a uma velocidade de 2000 revoluções por minuto. O tamanho está intimamente relacionado ao KV. Motores grandes geralmente têm um torque mais alto, mas menor kV, e usam hélices maiores, enquanto motores delgados, mas mais longos, terão maior kV, baixo torque e são mais adequados para pequenas hélices. A potência máxima do motor também é um fator a ser considerado. Exceder o limite de potência do motor fará com que o motor aqueça, reduzindo bastante sua eficiência ou mesmo danificando -o. Para o mesmo valor de KV, o desempenho de uma marca de motor pode ser melhor do que outras marcas. É por isso que você deve testar o motor elétrico antes de construir um drone ou outro equipamento ao redor dele.