The biggest difference between a DC brushless motor and a DC brush motor is the structure of the rotor and the driving method. DC brushless motors use generator brushes on the stator to generate AC power to drive the rotor, while DC brushed motors transmit DC current to the rotor through brushes on the stator. The differences between the two are mainly reflected in the following aspects:

Brush Motor

1. The difference in construction

The rotor of DC brushless motors usually uses permanent magnets or induction coils, which means that the rotor itself does not require any electrically charged devices. In contrast, DC brush motors need to install brushes on the rotor to supply power to achieve electrical energy conversion. Therefore, the internal structure of DC brushless motor is relatively simple and easier to maintain.

2. The difference of working principle

The working principle of DC brushless motor is to use the magnetic field generated in the stator under certain conditions to rotate the rotor to drive. The permanent magnet or coil in the stator will change poles as the current changes, and this process can make the rotor do continuous rotation. The DC brushed motor, on the other hand, is driven in a simpler way, by switching between brushes to control the direction of the current, thus driving the rotor to rotate.

3. The difference of advantages and disadvantages

The advantages of DC brushless motor compared with brush motor are high operating efficiency, low electromagnetic interference, long life, easy maintenance, etc.. The DC brush motor is often used in some low power products because of its simple structure and relatively low cost.

DC Motor

In short, both DC brushless motor and DC brush motor have their own characteristics, in the specific practical applications need to choose the right motor according to the specific needs.

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