Brief operating principle of brushless motor.

Brief operating principle of brushless motor.

Simply put, by changing the alternating frequency and waveform of the current wave input to the stator coil of a brushless motor, a magnetic field rotating around the geometric axis of the motor is formed around the winding coil. This magnetic field drives the permanent magnet steel on the rotor to rotate, and the motor starts to rotate. The performance of the motor is related to factors such as the number of magnets, the magnetic flux intensity of the magnets, and the input voltage of the motor. It is also closely related to the control performance of the brushless motor, because the input is direct current, and the current needs to be converted into three-phase alternating current by an electronic speed controller. It also needs to receive control signals from the remote control receiver to control the motor speed to meet the needs of model use. Overall, the structure of brushless motors is relatively simple, and the performance of their use is truly determined by brushless electronic speed controllers. A good electronic speed controller requires overall control of processes such as microcontroller control program design, circuit design, and complex processing technology, so the price is much higher than that of brushed motors.

Advantages of brushless motors:
1. Brushless, low interference

The brushless motor removes the electric brush, and the most direct change is the absence of electric sparks generated during the operation of the brushed motor, greatly reducing the interference of electric sparks on remote control radio equipment.

2. Low noise, smooth operation

Brushless motors without electric brushes greatly reduce friction during operation, resulting in smooth operation and much lower noise. This advantage is a huge support for the stability of model operation.

3. Long lifespan, low maintenance cost
Without electric brushes, the wear of brushless motors is mainly on the bearings. From a mechanical perspective, brushless motors are almost maintenance free motors, and when necessary, only some dust removal maintenance is needed. Comparing up and down reveals the advantages of brushless motors over brushed motors, but nothing is absolute. Brushed motors have excellent low-speed torque performance and high torque, which are irreplaceable by brushless motors. However, in terms of the convenience of using brushless motors, with the decreasing cost of brushless controllers and the development and market competition of brushless technology at home and abroad, brushless power systems are rapidly developing and popularizing, which greatly promotes the development of model motion.