1, from a brush dc motor to brushless dc motor transfer: the advantage of modern brushless motor performance and control circuit prices fall, make more rapidly in the application of model aircraft brushless motor. It especially has more obvious advantages in the large model aircraft. By a brush dc motor to transfer trend of the development of brushless dc motor (BLDCM). Model aircraft for using the latest design of sensorless brushless motor, it can start quickly, and good mechanical properties and regulation performance, the number range wide, high reliability, low noise, no commutation spark radio interference and other excellent performance. Using high-performance qin iron boron permanent magnet design, high power density efficiency is not lower than 0% 8. so under the same output power, brushless motor than traditional brushless dc motor has small volume, light weight. Brushless motor without spark interference of carbon brush motor at work, there is no carbon brush wear problem, so the brushless motor is more advantageous to distance from the remote control, and long service life, basically no maintenance.
2, dantian substructure and outer coexist, outer substructure has good prospects for development in this paper, the source global web of unmanned aerial vehicle (uav)
dantian substructure because of stator winding, rotor, rotor diameter is small, the motor of air gap is small, compared with the outer substructure, on the principle of the motor unit volume power is small, the weight of the motor to be more heavier. for model aircraft, motor also determine the weight of the aircraft parameters. Inner rotor stator small hole, if coil manual placement will be difficult. Due to dantian is sealing, cooling relative outside almost. For now, generally outside the motor winding for enameled wire, have waterproof function,Refers to can work in damp environment, can't work in the water)。 the brushless motor on the rc now use KV for the technical parameters are often used, KV refers to: the motor working voltage every increase 1 v, brushless motor speed value of the idle speed increase. Winding circle number, low KV value, maximum output current is small, but large torque; Winding circle number less, high KV value, maximum output current is big, but small torque; Single from KV value, can not evaluate motor is good or bad, because different KV value have different applicable occasions. Rc aircraft can be divided into two categories, fixed wing and rotor, the current popular electric helicopter brushless motors KV is higher, and fixed wing model aircraft aircraft brushless motors KV value is relatively low, novice play model aircraft try not to choose the helicopter, is difficult to handle, easy & otherThe Fried chicken & throughout; 。 Current model aircraft brushless motor with external rotor motor, in order to gain greater drive straight blade; And helicopter USES inner rotor brushless motor, in order to obtain the necessary source of motor speed in this paper, the global drone network brushless motor
