Brushless DC motor structure and working principle
Brushless DC motor (BLDC) is a kind of permanent magnet synchronous motor, not a real DC motor, referred to as BLDC. Different from brushed DC motor, brushless DC motor does not use mechanical brush device, square wave self-controlled permanent magnet synchronous motor, Hall sensor replaces carbon brush commutator, and NdFeB as permanent magnet material of rotor The performance is superior to the conventional traditional DC motor, and it is the most ideal speed-regulating motor.
Brushless DC motor driving method
The driving method of the brushless straight motor can be divided into a plurality of driving modes according to different categories, and each has its own characteristics.
1. According to the driving waveform: square wave drive, this driving method is convenient to implement, and it is easy to realize the motor without position sensor control;
2. Sinusoidal drive: This drive mode can improve the running effect of the motor and make the output torque uniform, but the implementation process is relatively complicated. At the same time, this method has two modes of SPWM and SVPWM (space vector PWM), and the effect of SVPWM is better than SPWM.
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