The DC motor is the first motor to appear, and it is also the first motor to achieve speed regulation. For a long time, DC motors have occupied the statistical status of speed control. Before adjusting the speed of the DC motor, the first thing to do is to measure the speed of the DC motor. Then how to determine the speed of the DC motor? The following is a detailed introduction for everyone:
1. Photoelectric speed measurement method
Use grid disc and photoelectric gate 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 are coordinated by two timing/counters of the single-chip microcomputer, one for counting and one for timing. Calculate the number of pulses per unit time m, after unit conversion, the speed of the DC motor can be calculated.
2. Hall Effect Principle Velocity Method
The rotating shaft of the motor drives the magnetic steel on the shaft to rotate, thereby changing the size of the magnetic field. The change of the magnetic field is converted into a pulse signal through the Hall circuit, which is amplified and shaped to output a rectangular pulse signal.
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