There are many instruments with rotating functions in production and life. We all need to continuously measure their speed to ensure that this instrument can work better. This requires the assistance of eddy current sensors. The following Chinese sensor trades Experts from the web will introduce to you how the eddy current sensor performs speed measurement.
For all rotating machinery, it is necessary to monitor the rotation speed of the rotating machinery shaft. The rotation speed is an important indicator to measure the normal operation of the machine. Rotation measurement usually has the following types of sensors to choose from: eddy current speed sensor, passive magnetoelectric speed sensor, active magnetoelectric speed sensor, etc.
The specific type of sensor needs to be selected, according to the required speed of the speed measurement, etc., the speed generation device has the following types: use the standard involute number of teeth (M1～M5) as the speed generation signal, and open a key groove on the shaft. The rotating shaft has a hole on the rotating shaft, a convex key on the shaft and other speed generating signal devices.
Passive magnetoelectric sensor is a power generation sensor (passive) designed for measuring gears. It is not suitable for measuring zero speed and lower speed. Because of low frequency, small amplitude signal and poor anti-interference ability, it does not need power supply. The active magnetoelectric sensor uses a power supply, the output waveform is a rectangular wave, has the load driving capability, and is suitable for measuring speed signals above 0.03 Hz.
The superiority of the eddy current sensor to measure the speed is unmatched by any other sensor. It can respond to both zero speed and high speed. The requirement for the rotation speed generating device of the shaft of the measured body is also very low. The number of gears of the measured body can be very small, and the measured body can also be a small hole, a convex key, and a small concave key.
The eddy current sensor is usually used to measure the speed of φ3mm, φ4mm, φ5mm, φ8mm, φ10mm probes. The frequency response of rotational speed measurement is 0～10 kHz. The eddy current sensor measures the speed, and the signal amplitude output by the sensor is high (in the whole range of low speed and high speed) and has strong anti-interference ability. There are two types of eddy current sensors for speed measurement: integrated and separated.
The integrated eddy current speed sensor cancels the pre-amplifier, and is easy to install. It is suitable for the working temperature of -20℃～100℃. The eddy current sensor with the pre-amplifier is suitable for the working environment of –50℃～250℃ in.
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