Summary:...
Brushless DC motors are widely used in micro-machines in various industries: such as circulating fans, humidifiers, dehumidifiers, air fresheners, cooling and heating fans, soap dispensers, hand dryers, smart door locks, textile machinery, laser processing machinery, Engraving machines, printing machinery, medical equipment, automatic packaging machines, various robots, automated production lines, CNC lathes, measuring instruments, electronic manufacturing equipment, etc.
Brushless motors are also called DC variable frequency motors (BLDC) in some fields. It uses electronic commutation (Hall sensor), and the coil (armature) does not move the magnetic pole. At this time, the permanent magnet can be outside the coil or inside the coil. , So there are outer rotor brushless motors and inner rotor brushless motors. The brushless motor has the same structure as the permanent magnet synchronous motor.
However, a single
bldc gear motor is not a complete power system. The brushless system is basically controlled by a brushless controller, that is, continuous operation is achieved through an ESC. It is a brushless electronic speed controller (ie ESC), which determines its performance. There are generally two types of drive currents for brushless motors, one is square wave and the other is sine wave. Sometimes the former is called a DC brushless motor, and the latter is called an AC servo motor. To be precise, it is an AC servo motor.
For example, when the rotor is in a certain position, elements 2 and 3 near the hall will be activated with N poles, and the controller will turn on the two coils to magnetize the coils B S pole and C N pole to attract the rotor to rotate. When the rotor turns to the next position, only Hall element 2 is activated, and the controller will turn on coils A and c. The former is magnetized to the S pole.
The latter is magnetized to the N pole, and continues to pull the rotor to rotate, constantly changing the energization of the coil, and the rotor can be continuously transmitted. This is how the brushless DC motor works.
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