Linear Potentiometer

Linear potentiometer advances position feedback, guidance and control systems in a unique and cost-effective way!

A linear potentiometer converts linear displacement into a change in voltage output signal. Unlike the LVDT, the resulting output is due mainly to a change in resistance brought about by the movement of a wiper or slider.

In some designs, the connection that varies the circuit resistance is achieved by the wiper or slider being pressed down by mechanical or some other means. This is especially true in the case of a potentiometer transducer which circuitry involves the use of thin film materials.

Essentially linear displacement potentiometers are transducers that act as variable resistors. Consisting of three lead wires, two of which connect from the power source, which can be AC or DC, to the wire wound resistor. The ohmage is constant between them, while the third lead wire connects to a slide bar, the movement of which ends in a change in voltage output.

The linear potentiometric transducer have long been used in many and wide-ranging industrial, medical and transport applications.

Some are used as part of position-feedback mechanisms, others as limiting devices just like those found in the music industry, this type of potentiometer transducer is used as a controlling device for guitar amplifiers. Again they figure prominently in control of valve positioning in food processing as well as in pharmaceutical and biomedical plants and a whole lot more usages.

Potentiometric transducers are quite popular in logging and lumbering industry when it comes to maximizing output from harvested trees. When loaded into a cutting machine, specifically a dual band saw, these transducers with the aid of microprocessor-type controllers ascertain the most favourable cutting means to reduce to the smallest possible waste. It is but necessary to adjust the saw cutting bands to achieve this aim.

The many advantages of using this transducer include but not limited to a high degree of precision, multi-million stroke lifespan, a wide operating temperature range, costs less expensive compared to other type of linear transducers, extremely high resolution and high output voltage.

Linear Potentiometer

Following are some of the linear potentiometer devices available in the market.

1) AutoLoc LAD12 0-12" Adjustable Linear Actuator with Rod Bearing - 200 lbs.

linear potentiometer
AutoLoc LAD12 0-12" Adjustable Linear Actuator with Rod Bearing - 200 lbs.
  • Ball bearing rod and heavy duty motor with built in potentiometer
  • Screw drive assembly lifts up to 200 pounds with 12 inch travel
  • 10:1 gear ratio for quick operation
  • Built in clutch and high torque electric motor are permanently sealed and lubricated

linear potentiometer
Warner Linear M1-D012-0100-A06-LN 6" Stroke Length Light Duty Actuator
2) Warner Linear M1-D012-0100-A06-LN 6" Stroke Length Light Duty Actuator

  • Maintenance Free
  • Long-Life Service
  • 12 volt
  • 6" stroke

3) Von Weise®, Linear Actuators, 12VDC, 30" Stroke dDrawing 11 Amps

linear potentiometer
Von Weise®, Linear Actuators, 12VDC, 30" Stroke dDrawing 11 Amps
  • New linear actuator from Von Weise®, made for sliding camper sections, has a motor approx 6-1/2" x 3" x 6-1/2" overall.
  • Draws 11A at 12VDC under load, 1.25A no load, and spins approx 150 rpm. Has 4" leads with a 2-pin connection.
  • Output is through a 3/4" dia threaded rod inside a 1-3/8" dia x 41" long steel pipe (44" long over all.). Approx 30" stroke.

Related Articles

LVDT Sensor, a transducer critical in many industrial and medical applications!

The LVDT sensor or linear variable differential transformer transducer or lvdt transducer or whatever you want to call it is a linear displacement transducer. It generates an electrical voltage output proportional to the mechanical movement of a magnetic core. It is widely used for bringing about measurements of comparatively small displacements. This linear transducer is composed of a primary coil and two secondary coils externally connected in series opposition. The coils are symmetrically embedded in a cylindrical metal receptacle. The iron core which moves axially within the cylinder is held in position by a sensor probe. The positioning of the iron core is such that there is no physical and electrical contact between the core and the coils. The reliability and longevity of this transducer is due in part to this feature of contactlessness.

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