The basic concept and working principle of DC brushless motor

With the rapid development of the motor industry, the use of brushless DC motors is gradually widespread, such as models, electric cars, electric toothbrushes, hair dryers, power tools, etc. The emergence of brushless motors solves the problem of brushed motors require frequent replacement of carbon brushes, which is relatively more convenient, so how about the basic concept and working principle of brushless DC motors?Vacuz briefly give you an introduction to it!

Basic concept of DC brushless motor.

According to the structure and working principle of the motor, we can classify brushless motor into inner rotor brushless motor and outer rotor brushless motor.

The stator of brushless motor is the component that generates rotating magnetic field and can support rotor rotation, mainly composed of silicon steel sheet, enameled wire, bearing and bracket; while the rotor is affixed with NdFeB magnet and rotates under the action of rotating magnetic field of stator, the component mainly consists of rotor shaft, magnet and bracket. In addition, the number of pole pairs composed of stator and rotor also affects the speed and torque of the motor.

Simply put, a brushless DC motor relies on varying the alternating frequency and waveform of the current wave input to the brushless motor stator coil to create a magnetic field around the geometric axis of the motor winding the winding coil. This magnetic field drives the rotor on the rotor. When the permanent magnets rotate, the motor starts. The performance of the motor is related to the number of magnets, the flux strength of the magnets, and the input voltage to the motor. It also has a lot to do with the control performance of the brushless motor, which is DC. The current needs an electronic governor to turn it into three-phase alternating current. It also needs to receive control signals from the remote receiver to control the motor speed to meet the needs of the model.

Generally speaking, the structure of brushless motor is relatively simple, and what really determines its performance is the brushless electronic governor (i.e. ESC). A good ESC requires microcontroller control program design, circuit design and complexity, machining process and overall control of other processes, so generally speaking, the price is much higher than brushless motor.

The above is the basic concept and working principle of brushless DC motor, regardless of the inner rotor brushless motor and outer rotor brushless motor, in fact, the principle is similar, master these basic knowledge and related content, in order to better use them!

WhatsApp/Wechat: +86 13075286997

Email: sales@vacuz.com [fusion_form form_post_id=”431″ margin_top=”” margin_right=”” margin_bottom=”” margin_left=”” hide_on_mobile=”small-visibility,medium-visibility,large-visibility” class=”” id=””][/fusion_form]