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Definition and Working Principle of Weighing Sensors
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Relevant sensor technology papers
Publish Time:
2020-07-08
A load cell is a device that converts a mass signal into a measurable electrical signal output. There are qualitative differences between the old and new national standards in the basic concepts and evaluation methods of the main technical indicators of load cells. There are several styles, mainly S-type, cantilever type, spoke type, plate ring type, bellows type, bridge type, and column type.
When it comes to load cells, many people think that these are only sensors for measuring the weight of objects. This is not entirely correct; they are also applied in many fields. Load cells share similarities in principle with pressure sensors discussed previously, but their shapes differ. Modern scientific and technological industries use load cells everywhere; below, we will introduce the working principle and definition of load cells.
Definition of Load Cell
A load cell is a device that converts a mass signal into a measurable electrical signal output. There are qualitative differences between the old and new national standards in the basic concepts and evaluation methods of the main technical indicators of load cells. There are several styles, mainly S-type, cantilever type, spoke type, plate ring type, bellows type, bridge type, and column type.
Working Principle of Load Cell
The working principle of load cells has two basic structural types: linear and rotary (disc type). They consist of a slider and a fixed scale (linear type) or a rotor and a stator (rotary type) that can move relative to each other. These two types of load-sensing synchros are manufactured using the same process.
First, conductive copper foil (0.04~0.05mm thick) is firmly bonded to a substrate of low-carbon steel or glass, etc., using an insulating bonding agent. Then, according to the design requirements, photolithography or chemical etching is used to etch the copper foil into planar windings of different tortuous shapes. This type of winding is generally called a printed circuit winding. The winding distribution on the fixed scale and slider, and the rotor and stator, is different. The windings on the fixed scale and rotor are continuous windings, while the windings on the slider and stator are segmented windings. The segmented windings are divided into two groups, arranged at a spatial phase angle of 7r left, hence also known as positive and cosine windings.
The continuous and segmented windings of the synchro are equivalent to the primary and secondary windings of a transformer, working on the principle of alternating electromagnetic fields and mutual inductance.
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