What are the important parameters of the model aircraft brushless motor?

Model airplane brushless motor is a kind of high efficiency and high performance electric robot components, which is composed of brushless DC motor, controller and accessories. The biggest difference between the model aircraft brushless motor and the traditional DC motor is that the brushless motor has no carbon brush in the traditional motor, which has higher efficiency and longer service life compared with the traditional motor. Model aircraft brushless motor can not only help uav, aircraft, ships, vehicles and other model aircraft equipment to accelerate quickly, but also can achieve accurate control through the controller, so that its flight, driving, floating and other operations more stable, light, low energy consumption. The working principle of the brushless motor is to use the electronic AC to control the power supply to convert the electric energy into mechanical energy. During the operation, the controller is needed to accurately adjust the speed and torque of the motor to achieve the required power and movement. Compared with traditional motors, the model brushless motor has the following advantages: first, high efficiency, more than 90%, which means a smaller power supply can produce more power; the second is less noise, brushless motor without the traditional carbon brush noise, less noise, more suitable for complex environment; third, long life, the traditional motor from the carbon brush wear, the life is extended; fourth, the power is strong, the model brushless motor speed and torque is relatively higher, can achieve higher speed and greater load.

What about the external rotor brushless DC motor? The outer rotor motor makes the original central position of the magnetic steel and sticks it to the shell. When the motor is running, the whole shell is turning, while the coil stator in the middle does not move. The outer rotor brushless DC motor than the inner rotor, the rotor inertia is much larger (because the main mass of the rotor is concentrated in the shell), so the speed is slower than the inner rotor motor, usually KV value between hundreds to thousands, used in the model aircraft can directly drive the propeller, and save the mechanical deceleration mechanism.

More important in the parameters are the KV value, size, and maximum current. KV value: represents the speed not increased by 1v per minute. Size: 2306, the first two is the stator outer diameter (mm), after two is the stator height (mm), the greater the size power, but the heavier the weight, need to choose according to their requirements, the size of the base, must see how big, choose rack need to choose corresponding, so as not to assemble motor (common 9mm, 12mm diameter). Maximum current: 45A, which is also the reference data that you choose electric adjustment, at this time to choose 45A electric adjustment is enough, because 45A electric modulation can generally burst in 50 S 10 A current few people will always full throttle fly. Voltage: the following part of the table is the corresponding voltage and different sizes of the motor performance, you can see the size of the tension, the voltage, the motor heating, the size of the blade, these are more important parameters.

At present, the power configuration of the model aircraft basically adopts the "brushless motor" power adjustment combination scheme, most of us call this kind of motor "brushless motor", some people also call it BLDCM, combined with information and related work experience, this kind of motor is not mature. First of all, there are certain problems called DC brushless motor. The data shows that the anti-electromotive force of BLDCM adapted to square wave drive is similar to trapezoidal wave. The anti-electromotive force of trapezoidal wave is not formed accidentally, but artificially controlled, mainly using the whole distance concentrated winding, permanent magnet shape is tile shape, multi-radial charging and other magnetic charging. The motor is suitable for square wave control, which is commonly used for model aircraft. However, I have actually tested a variety of manufacturers and different models of brushless motor, and the reverse electric momentum is a positive child wave. Query the exposed brushless motor winding mode and the motor removed by oneself, it can be determined that this kind of motor is the fraction slot centralized winding permanent magnet synchronous motor. The synchronous motor with sinusoidal potential can be controlled by the square wave inverter, which causes some believe that the motor is BLDCM. Therefore, the complete description of this kind of motor should have the following keywords: the external rotor (only the external rotor motor is studied, the inner rotor is not studied), fraction slot, concentrated winding, permanent magnet synchronous motor. By the way, the control mode, the square wave drive advantage is low cost, good support, basically do not pick the motor. The control accuracy is relatively general, and there is no current ring loop, its speed loop bandwidth is quite low, the acceleration and deceleration can be distinguished by the naked eye. Although the performance is poor, but with good flight control algorithm, careful participation and adjustment, this can be compensated. The other is a sinusoidal drive, which has a current ring, responds very fast, and the overall hardware cost is about twice as much, so the algorithm costs even higher. The current common control algorithm is the FOC.

The above is our VSD motor to share with you about the model aircraft brushless motor expertise. For more information, please contact our professional customer service personnel to answer. Thank you for clicking and watching.