Mechanical Rotary Encoders

Mechanical rotary encoders, also called shaft encoders, are electro-mechanical devices that convert the angular motions (movement around fixed points) of rotary shafts into either analogue or digital signals.

What are mechanical rotary encoders used for?

Applications that require precision shaft rotation (movement around a specific point) make use of mechanical rotary encoders.

These include industrial control machinery in factories, rotating radar platforms in satellite structures or computer input devices like trackballs and mice.


Types of mechanical rotary encoders

Absolute encoders:

  • have tracking functions to determine specific shaft positioning points in industrial equipment like CNC machines, lathes and bore machines.
  • maintain positioning data even when power is cut from the system. When the system is switched on again it begins operating from the point where it stopped previously.


Incremental (relative) encoders:

  • record deviations in shaft position points over certain time frames. With each new time frame after power is cut and switched on again the encoder starts recording from a predetermined reference and measures the distance between the previous point and the current point.

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Description Price Pulses Per Revolution Shaft Style Shaft Diameter Encoder Reading Encoder Signal Mounting Type Shaft Length Index Output Maximum Operating Speed Mounting Hole Diameter Current Rating
RS Stock No. 167-5089
Mfr. Part No.PEC12R-2125F-N0012
BrandBourns
HK$6.17
Each (In a Bag of 75)
units
12 Flat 6 mm Incremental Digital Square Wave Through Hole 15mm Not Indexed 100rpm 1 mm, 2 x 2.1 mm -
RS Stock No. 2509638780
Mfr. Part No.PEC11-4125F-N0018
BrandBourns
HK$13.44
Each
units
- - - - - - - - - - -
RS Stock No. 2509637327
Mfr. Part No.702-01-16
HK$68.46
Each
units
- - - - - - - - - - -
RS Stock No. 2509637355
Mfr. Part No.703-10-00
HK$54.60
Each
units
- - - - - - - - - - -
RS Stock No. 2509644123
Mfr. Part No.ECW1J-B24-BC0024L.ExR_FRG
BrandBourns
HK$33.98
Each
units
- - - - - - - - - - -
RS Stock No. 2509637311
Mfr. Part No.702-01-12
HK$198.38
Each
units
- - - - - - - - - - -
RS Stock No. 2509644117
Mfr. Part No.ECW1J-B24-AC0024L.ExR_FRG
BrandBourns
HK$33.98
Each
units
- - - - - - - - - - -
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