X-TEAM: One minute to let you know the development of RC brushless motors
1. Transfer from brushed DC Motor to brushless DC motor:
The advantages of modern brushless motor performance and the decline in the price of control circuits have led to a rapid increase in the use of brushless motors in model aircraft. It has a clear advantage especially in medium and large model aircraft. There has been a trend toward the shift from brushed DC motors to brushless DC motors.
The RC model-specific brushless motor uses the latest sensorless design, which has excellent start-up, good mechanical and adjustment characteristics, wide range of modulation, high reliability, low noise, and no commutation spark radio interference. High-performance Qinling boron permanent magnet high power density design, the efficiency can be no less than 80%. Therefore, at the same output power, the brushless motor is smaller and lighter than the conventional brushed DC motor.
The brushless motor does not have the spark interference of the carbon brush motor, and there is no problem of the carbon brush wear. Therefore, the brushless motor is more advantageous for long-distance remote control, and has a long service life and basically requires no maintenance.
2, the inner rotor structure and the outer rotor structure coexist, the outer rotor structure has a good development prospect
The structure of the brushless motor can be divided into an inner rotor structure and an outer rotor structure, as shown in the following figure:
The picture above shows the X-TEAM inner rotor brushless motor;
The picture above shows the X-TEAM outer rotor brushless motor;
Since the inner rotor structure is outside the stator winding, the rotor diameter is small, and the air gap of the motor is small. Compared with the outer rotor structure, in principle, the power per unit volume of the motor is small, and the weight of the motor is heavier. For model airplanes, the weight of the motor also determines the important criteria for aircraft parameters.
The inner rotor stator hole is small, and it is difficult to manually place the coil. Since the internal rotation is sealed, the heat dissipation is almost out of the way. At present, the general external motor winding is an enameled wire, which has a waterproof function (meaning that it can work in a humid environment and cannot work in water).
At present, the brushless motor used in the model is usually KV as the technical parameter, and KV refers to the increase in the rotational speed of the brushless motor for each 1 volt increase in the operating voltage of the motor.
The number of turns is large, the KV value is low, the maximum output current is small, but the torque is large;
The number of turns is small, the KV value is high, the maximum output current is large, but the torque is small;
From the KV value alone, it is not possible to evaluate the quality of the motor because different KV values ​​have different applications.
The aircraft model aircraft can be divided into two categories: fixed wing and rotor. The current brushless motor KV of the electric helicopter is higher, while the KV value of the fixed-wing aircraft model aircraft brushless motor is relatively low. The novice model is not to choose a helicopter. Control, easy to "fried chicken." At present, most of the RC motors use external rotor brushless motors in order to obtain a larger direct-drive paddle. The helicopter uses an inner-rotor brushless motor to obtain the necessary motor speed.
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