How to test the speed of DC geared motor ?
1. Photoelectric velocimetry
A grid disc and a photoelectric gate are used to form a 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 cooperate with two timers / counters of the microcontroller, one counting and one timing. Calculate the number of pulses m per unit time. After unit conversion, the speed of the DC geared motor can be calculated.
2.Hall effect principle velocimetry
The shaft of the DC geared motor drives the magnetic steel on the shaft to rotate, thereby changing the magnitude of the magnetic field. The magnetic field change is converted into a pulse signal by the Hall circuit, which is amplified and shaped to output a rectangular pulse signal. When the speed is changed, the frequency of the output pulse will change. The speed at which the DC geared motor rotates is thus obtained.
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