The brushless motor is mainly composed of three parts: front cover, middle shell, and rear cover. The following is an introduction to the structure of the brushless motor:
The front cover, middle shell, and back cover of a brushless motor are mainly integral structural components that play a role in constructing the overall structure of the motor. However, the outer shell of the brushless motor with an outer rotor is also the magnetic circuit path of the magnet, so the outer shell is composed of a magnetic conductive material. The outer shell of the inner rotor is only a structural component, so the material is not limited. However, the inner rotor motor has an additional rotor core compared to the outer rotor motor, which also serves as a magnetic circuit path.
Magnet: It is installed on the rotor and is an important component of brushless motors. The vast majority of performance parameters of brushless motors are related to magnets, including power, speed, torque, etc.
Silicon steel sheet: It is an important component of slotted brushless motors. Of course, slotted brushless motors do not have silicon steel sheets, but currently the vast majority of brushless motors have slots. Its main function in the entire system is to reduce magnetic resistance and participate in magnetic circuit operation.
Shaft: It is the direct force bearing part of the motor rotor, and the hardness of the shaft can meet the requirements for high-speed rotation of the rotor.
Bearings: are the guarantee for smooth motor operation. Bearings can be divided into sliding bearings and rolling bearings, and rolling bearings can be further divided into ten categories: deep groove ball bearings, needle roller bearings, and angular contact bearings. Currently, most brushless motors use deep groove ball bearings.

The above are the components of a brushless motor. Of course, if you want to operate it in other ways, you need to cooperate with a brushless motor controller to operate. The controller of a brushless motor is relatively complex compared to a brushed motor controller, so the production cost is relatively high and the price is also relatively high.

Editor: ZiYu