Potentiometers used on industrial handles, also known as angular displacement sensors, are more common in the industrial manipulation market. As an independent device on the handle to realize voltage analog output, it converts mechanical displacement or other non-electricity that can be converted into displacement into a change in resistance value that has a certain functional relationship, thereby causing a change in the output voltage; the following is the potential The working principle of the device is explained in detail.
First, the structure of the potentiometer Potentiometers used on industrial handles are generally divided into 3-pin and 4-pin types; the structure of 3-pin potentiometers is generally composed of a resistor body, a rotating shaft, a sliding arm, a sliding end, and a solder tab; the structure of a 4-pin potentiometer is compared with that of 3-pin potentiometers. The potentiometer has one more neutral end (also known as the center tap); usually the handle generally uses a 3-pin potentiometer, which is used in the neutral handle (that is, the handle is in the middle position under normal conditions, and the output changes when the handle is shaken forward and backward) And the unilateral handle (that is, the handle is normally in the side position, the handle can only be shaken forward or backward to get a set of required variable values); and the 4-pin potentiometer is generally not used for the unilateral handle, because it has There is a middle tap end (the center has a dead zone), and the 4-pin potentiometer can be regarded as two groups of parallel active resistors from the structure, so it can output a set of symmetrical variable values.
Second, the wiring of the potentiometer The connection method of the 3-pin potentiometer: if it is used as a variable voltage divider, one end is connected to the input voltage, the sliding end is connected to the output, and the other end is grounded; if it is used as a variable resistor, one end is connected to the input voltage, the sliding end is connected to the output, and the rest The end can be left floating, or connected with the sliding end. Because the 4-pin potentiometer has one more center tap end, it is generally used in the handle that requires a neutral dead zone, or requires a fixed median output value, or outputs a set of symmetrical variable values. Wiring method: When using the neutral dead zone, it is the same as the variable pressure connection method of the 3-pin potentiometer, except that the center tap end is suspended (if the output is connected, the output voltage is half of the input voltage, and does not change with the shaking of the handle); Symmetrical variable value connection: the two fixed ends are short-circuited to connect the input voltage, the center tap end is grounded, and the sliding end is connected to the output. At this time, the handle outputs the same forward and backward from the center position.
