Brushless motor technical advantages: 1, good controllability, wide speed range. 2, high reliability, long working life, need not often maintenance. 3, high power factor, high efficiency, large power density. Similarly, brushless dc motor has certain technical disadvantages 1, electronic controller is needed to work, increase the technical complexity and cost, reduces the reliability. 2, rotor permanent magnet material limits the motor using the environment, is not suitable for high temperature environment. 3, have significant torque ripple, limiting the speed of motor servo system in high performance, low ripple system applications. Three basic parameters, brushless motor, named: the naming principles of external rotor motor, each manufacturer is different, have been named by the diameter of the motor stator height, there are also named after the motor of height to diameter, our motor is named the diameter of the motor stator and height. For example 2212 motor, refers to the motor stator 22 mm diameter, height of 12 mm. The stator diameter: the diameter of the stator silicon steel sheet of the stator height (Thickness): the number of the height of the stator silicon steel sheet iron core (Slot number)A number of magnetic steel number: the slots of the stator silicon steel sheet (The number of): the rotor magnet steel on the number of number of turns (T）: motor stator slot of the laps around the enameled wire above, notice that the regular circle number refers to the adjacent two slot and coil number, that is, a CaoRao eight laps, another is 8, 16 t. KV value: the higher the running speed of the motor, motor speed. Motor speed = KV voltage value * work. No-load current: specify the voltage, the motor of work without any load current phase resistance: after the motor connection, two contact resistance between the maximum continuous current: the motor operates the largest safety current maximum continuous power: the power maximum safe power of the motor running * = voltage current motor weight: the weight of the motor diameter of axle: the diameter of the shaft
