The model aircraft dynamic configuration of the basic use and otherBrushless motor & throughout; Electrically controlled combination plan, most of us call such motor & otherBrushless motor & throughout; , also some people called the BLDCM, combining data and related work experience, in the description of the motor is not mature.
in the first place, called a brushless dc motor, there is a problem according to adapt to a square wave drive BLDCM counter electromotive force is similar to the trapezoidal wave, trapezoidal wave counter electromotive force is not accidental, but human control, mainly adopts the whole from the concentrated winding, permanent magnet for tile shape, more radial magnetization, etc. This kind of machine is suitable for the square wave to control, that is, common rc electrical modulation control method.
and my actual tested a variety of manufacturers and different types of brushless motor and counter electromotive force are the sine wave. Query revealed the brushless motor winding way and hurt myself, sure, this kind of motor for fractional slot concentrated winding permanent magnet synchronous motor. The counter electromotive force for sinusoidal synchronous motor is controlled by square wave inverter, which creates a part of people think that the motor is BLDCM.
if it is, of course, by controlling the way classification of motor, and then its belong to BLDC, motors are not can't. Very rigorous temporary not found, the definition of the future.
so complete description of the motor should have the following key words: outer rotor (Only studied the external rotor motor, the rotor is studying), score trough, concentrated winding, permanent magnet synchronous motor.
by the way, the control mode, the electrically controlled using square wave drive advantage is low cost, good robustness, basic don't pick the motor. Control precision is relatively general, and there is no current inner loop, the speed loop bandwidth is quite low, the dongguan model aircraft brushless motor, deceleration to the naked eye. While performance is poor, but with good flight control algorithms, careful careful parameter adjustment, which can compensate.
is another kind of sinusoidal drive, but the driver is the need for precise motor parameters, not casually in the motor, the sensorless algorithm is not very mature, but there are current loop, the response speed is very fast. The whole hardware cost can probably also have twice that of the former algorithm costs are higher. At present, the common control algorithm is FOC. DTC also need some time. Sensorless rotor position estimation in the majority with high frequency injection. These technologies applied in multiple rotor know only one, grinding the control chip, but a good guess model. Feel sinusoidal drive is the development direction of high-end model aircraft in the future, after all, response speed and precision is necessary guarantee of flexible movement.
