​How does a brushless motor work?
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​How does a brushless motor work?

Views: 0     Author: Site Editor     Publish Time: 2021-09-02      Origin: Site


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Brushless motors are common in industrial applications worldwide. At the most basic level, there are brush and brushless motors, as well as DC and AC motors. You might think that a brushless motor does not contain brushes, but uses DC current.

Compared with other types of motors, these motors have many specific advantages, but apart from basic knowledge, what exactly is a brushless motor? How does it work and what is its purpose?

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

(1) How do Brushless motors work?

(2)What is the function of brushless motors?

(3)Applications of Brushless motor


(1) How do Brushless motors work?

What is the working principle of brushless motor?

It usually helps to explain the working principle of a brushed DC motor because it has been used for a while before the brushless motor is available. 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 motors actually flip from the inside out, so there is no need to use brushes to flip the electromagnetic field. In a brushless 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.

 Brushless motors

(2) What is the function of brushless motors?

The efficiency of a brushless motor is usually 85-90%, while the efficiency of a brushed motor 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 motors are quiet, light, and have a longer service life. Because the computer controls the current, the brushless motor can achieve more precise motion control.

Because of all these advantages, brushless 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 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.


(3) Applications of Brushless motor

We can expect BLDC motors (brushless DC motor) to be more widely used in the future. For example, they may be widely used to drive service robots, which are small robots that provide services in areas other than manufacturing. Some people may think that stepper motors will be more suitable for this application, in which pulses can be used to precisely control positioning. But BLDC motors are more suitable for controlling power. And for stepping motors, maintaining the position of structures such as robot arms will require relatively large and continuous currents. For BLDC motors, all that needs to be done is a current proportional to the external force to achieve more energy-efficient control. BLDC motors may also replace simple brushed DC motors in golf carts and mobile carts. In addition to improving efficiency, BLDC motors are also ideal for drones. Their ability to provide precise control makes it particularly suitable for multi-rotor drones. In this case, the attitude of the drone can be controlled by precisely controlling the rotation speed of each rotor.

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