Rotational Position Sensor
Rotational Position Sensor
(OP)
Hi,
Currently I have a shaft that has a limited rotation from +90 to +15 degrees. Clamped to the end of the shaft is a cam that engages 3 different on/off switches which lead to a "pc board". Each location of the 3 switches can be adjusted via screw, which is how the mechanism is callibrated by assemblers. The switches are cumbersome and I'd like to move to a less mechanical method of tracking the shaft's angular position while retaining the ease of adjustment by an assembler. I know this is a general description of my situation,but if someone could point me in the right direction of whats out there I'd appreciate it. Thankyou in advance
Currently I have a shaft that has a limited rotation from +90 to +15 degrees. Clamped to the end of the shaft is a cam that engages 3 different on/off switches which lead to a "pc board". Each location of the 3 switches can be adjusted via screw, which is how the mechanism is callibrated by assemblers. The switches are cumbersome and I'd like to move to a less mechanical method of tracking the shaft's angular position while retaining the ease of adjustment by an assembler. I know this is a general description of my situation,but if someone could point me in the right direction of whats out there I'd appreciate it. Thankyou in advance





RE: Rotational Position Sensor
One of the simplest solutions is an encoder and a counter. Plus a set of comparators that output a signal when the respective position is arrived at. But such a solution loses its reference everytime power is cycled off/on. And that is usually not acceptable.
Another, rather expensive way of doing it (at least if you need good precision - better than, say, one degree) is to use an absolute encoder and comparators (no counter needed). I will always know where it is. No need for "grid search" after power off.
There are also very simple potentiometric solutions. All you need is a potentiometer to pick up position and then a set of potentiometers to set the different angles where you need an output. Simple potentiometers have a limited life. But there are non-contacting ones that have an extremely long life. The electronics needed is extremely simple (and cheap). Google "non-contacting potentiometer".
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Rotational Position Sensor
RE: Rotational Position Sensor
http://www.schaevitz.com/
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RE: Rotational Position Sensor
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RE: Rotational Position Sensor
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Rotational Position Sensor
m777182
RE: Rotational Position Sensor
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Sometimes I only open my mouth to swap feet...