This topic is a DC motor PWM speed controller design study, the main achievement of motor control. Therefore, in design, the principle of the DC converter. In the design, using AT89C51 microcontroller as the control system the core of the control circuit in the design, the use of PWM speed control mode, by changing the PWM duty cycle to change the motor armature voltage, so as to realize the motor' s speed.

直流风扇电机转速测量与PWM控制_单片机课程设计.doc

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