Printer Dc Motor pulse width modulation
Pulse width modulation can be generated by programming a microcontroller with a PWM output, or it can be implemented with a PWM dedicated chip. When the frequency of the PWM wave is too high, it requires too much power to the power tube driven by the DC motor, and when its frequency is too low, the electromagnetic noise generated by it is relatively large. In practical applications, when the pulse width modulation wave When the frequency is around 18KHz, the effect is best.
In the circuit designed by the brushless DC motor, the hardware circuit is designed according to the circuit principle. The measuring device can measure the speed of the DC brushless motor with a large speed range. Through each rotation of the motor, the infrared pair tube speed measuring circuit is used to accumulate, and finally, the specific value of different speed levels can be known by the difference of the values in the 1S time.
The number of turns that are rotated in a fixed time is different, the duty ratio is different, and the obtained infrared pair tube speed measuring circuit is different in size. Finally, the specific value of the speed can be displayed by software programming on the digital tube.
