You might have heard of magnetic speed sensors by now and are wondering precisely how they work? How in the heck can a magnet function to determine the speed of something? When it does, what on earth does the magnet focus on to work, because after all magnets react to ferrous metals like iron and steel.
When someone is speaking about load cell, the things they really are referring to is really a hall effect sensor. Whilst they are normally used in such systems as anti-lock braking systems in cars, they are now in common utilization in any number of hi-tech systems and machines that require the usage of electronic transmission of speed or RPM data and information.
They obtain their name for the Hall effect that was discovered by a man by the name of Edwin Hall in 1879. In a nutshell, is refers to an electronic phenomena which is created on the opposite sides of the electronic conductor when an electronic current is flowing through it while a magnetic field is used perpendicular to the present.
Perhaps you have stopped to wonder how gages and micro load cell in rocket engines work? Man, those engines and everything in them must get hot! So why doesn’t the complete system go haywire when each of the finite mechanisms such as speed sensors that gage the rotation rate of all the different spinning motors get hot enough to melt common metals.
Well it might be easy to guess that they make everything away from high temperature alloys. Hey! What about electrical components that have finite moving parts? Won’t everything short out and have you thought about metal expansion in high temperatures? The reality is, that many of these problems have already been solved with the use of new hi-tech materials.
To begin with, high temperature sensors use magnets or silicon strips impregnated with magnetic material to really gage how quickly something is spinning, to ensure that eliminates any type of cable that would foul up in high temperatures. So, this eliminates one problem but what about thew others?
Ceramics Replaces Metal in High Temperatures. Ceramics are actually used extensively in hi-tech, high temperature speed sensors and when fact ceramics are discovering their way into many high temperature mechanical applications. Its hard, expands minimally, can be shaped and milled and doesn’t conduct electricity and withstands very high temperatures, so ceramics lexnkg great in high temperatures.
For wiring, copper which melts at about 2,000 degrees is replaced by new high tech alloys that withstand higher temperatures. Rather than plastic coating, like regular wire, other high tech heat resistant materials including asbestos are utilized to insulate the wiring in today’s high temperature speed sensor
While which is a mouthful to comprehend, in layman’s terms it allows for mechanisms to be used to really calculate the speed of something using electricity instead of a cable and gears. However; there has to be ferrous metal components of the device for that magnets inside the sensors to concentrate on. For example, a gear tooth hall effect torque transducer, such as is within use within anti-lock braking systems works with a gear for that sensor to focus on and tracks the rate in the passing gear teeth to generate data that is sent to the primary component that regulates the complete anti-lock braking system.