# Control Principle and ESC of brushless motor

by：V&T Technologies     2020-01-24
The control principle of brushless motor and the drive control of ESC motor are to control the rotation or stop of motor and the rotation speed. The control part of the stepper motor driver is also called the electronic governor, which is referred to as the ESC. The motor corresponding to the ESC is different, divided into brushless and brushed ESC. Brushless motor, as the name implies, this kind of motor has no so-called brush and phase changer. Its rotor is a permanent magnet, while the coil is fixed and directly connected to an external power supply, the problem is, how does the direction of the coil magnetic field change? In fact, an electronic governor is also needed outside the brushless motor. To put it bluntly, the governor is a motor drive, which changes the direction of current inside the fixed coil at any time, ensure that the acting force between it and the permanent magnet is mutually repulsive and the continuous rotation can continue. The brushless motor must have electrical adjustment, otherwise it cannot rotate. Direct current must be converted into three-phase alternating current through brushless electrical modulation, and can only rotate if it is lost to the brushless motor. From a professional point of view, the Brushless ESC output is three-phase alternating current. Our household 220V power supply for mobile phone chargers or computers is alternating current. Alternating current has a certain frequency. Generally speaking, it is a positive and negative exchange of positive and negative on a line. So what is three-phase power? Theoretically, three-phase alternating current is a transmission form of electricity, referred to as three-phase electricity, which is a power source composed of three alternating potentials with the same frequency, equal amplitude and 120 degree difference in phase. Generally speaking, the three alternating currents in our household are the same except for voltage, frequency and driving angle. Now, let's understand the three-phase electricity. Brushless ESC, the input is direct current, and the voltage is stabilized by a filter capacitor. Then it is divided into two ways, one of which is used by the esc bec, which supplies power to the receiver and the ESC's own single chip microcomputer, and the power lines output to the receiver are the red and black lines on the signal lines, the other way is to intervene in the use of MOS tube. Here, when the ESC is powered on, the single chip microcomputer starts to start, driving the MOS tube to vibrate, making the motor emit dripping sound. Standby after startup, some ESC with throttle calibration function, will monitor the throttle position is high or low or in the middle before entering the standby. Related reading: development trend of DC stepping Motor Servo Motor Technology TAG brushless motor
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