| BLUE
POT (CONTACTLESS POTENTIOMETERS, MAGNETO-RESISTIVE TYPE)
THEORY OF OPERATION |
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| The Blue
Pot is a true "contactless" potentiometric device developed by
Midori Precision Co., Ltd. Its technology is based on over 20 years of
research, development and manufacturing experience in the contactless
potentiometer field. The Blue Pot utilizes a pair of Magneto-Resistive
(MR) elements and a permanent magnet operating on the Hall Effect principle.
As shown in figure 1(A), the output is taken from the junction of the
MR elements connected in series. The permanent magnet, acting as a rotor,
is placed over the MR elements with a small air gap. Output response relative
to the rotor position is shown in figure 1(B).
The Blue Pot offers infinite resolution, low actuating force, fast response, superb frequency response (as high as 10 gHz) and low operating power. Above all, its unique design and construction makes the Blue Pot a cost effective, ultra-reliable position sensor. The Blue Pot is also available as a linear position and inclination sensor. The Blue Pot has no electrical contacts to oxidize or wear-out and is less sensitive to environmental factors such as humidity, salt spray, shock and vibration. However, the Blue Pot may require a temperature compensation circuit when used in wide angle or long stroke measurement and operating in a wide temperature range. Refer to the Blue Pot Temperature Compensation (.pdf file) section. |
 FIGURE 1A
 FIGURE 1B |
Cerrar Ventana |
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