A rotational speed sensor is a sensor that converts the rotational speed of a rotating object into an electrical output. Rotational speed sensors are direct measuring devices that can be manufactured by mechanical, electrical, magnetic, optical and hybrid methods.
According to the different signal forms, the speed sensor can be divided into two types: analog and digital.
Most output a pulsed signal (approximate sine or rectangular wave). There are two methods for measuring the rotational speed of a pulse signal: frequency integration method (also known as F/V conversion method, the direct result of which is voltage or current), and frequency calculation algorithm (the direct result of which is digital).
In automation technology, the rotational motion speed is measured more, and the linear motion speed is often directly measured by the rotational speed. A DC tachogenerator converts rotational velocity into an electrical signal. The speed tester requires a linear relationship between the output voltage and the speed, and requires the output voltage to be steep and the time and temperature stability to be good.
The speed measuring machine can generally be divided into two types: DC type and AC type. The rotating speed sensor touches the moving object directly. When a moving object touches a rotating speed sensor, friction drives the sensor's wheels to roll.
A rolling pulse sensor mounted on a roller sends a series of pulses. Each pulse represents a certain distance value, which allows the linear velocity to be measured. Electromagnetic induction type, a gear is installed on the rolling shaft, the outer side is an electromagnetic coil, and the rolling is due to the gap between the teeth to pass through, the voltage of the square wave change is obtained, and then the rotation speed is calculated.
The rotating speed sensor has no direct touch with the moving object, and the blade edge of the impeller is pasted with a reflective film, which drives the impeller to rotate when the fluid flows, and the impeller transmits a reflection of the optical fiber once every rolling week, generating an electrical pulse signal. The velocity can be calculated from the number of pulses detected.
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