Two methods for testing the speed of cheap Mini Dc Motor
DC motor is the earliest motor, and it is also the first motor to achieve speed regulation. For a long time, DC motors have occupied the main position of speed control. Before the DC motor speed regulation, the first thing to do is the DC motor speed measurement. There are two main methods for speed measurement:
Two methods for testing the speed of a DC motor:
1, photoelectric speed measurement method
The grid speed and photogate are used to form the speed measurement system. When the DC motor drives the grid disc to rotate through the transmission part, the speed measuring photoelectric gate obtains a series of pulse signals. These pulse signals are matched by two timer/counters of the microcontroller, one count, one timing. Calculate the number of pulses per unit time m. After unit conversion, the speed of DC motor rotation can be calculated.
2. Hall effect principle speed measurement method
The motor shaft drives the magnetic steel on the shaft to rotate, thereby changing the size of the magnetic field, converting the magnetic field change into a pulse signal through the Hall circuit, and amplifying and shaping to output a rectangular pulse signal. When the speed changes, the frequency of the output pulse changes, resulting in the speed at which the motor rotates.
