February 11, 2009 - Dynapar announces NorthStar HDN and HDP series of shaft-less encoders. The new encoders feature true non-contact sensing technology that eliminates encoder shafts, bearings, and seals. As a result, the encoder is highly reliable, compact, completely sealed, and easy to integrate into existing applications.
Coupling with “Air”
Unlike traditional encoders that require some form of shaft and bearing assembly, the NorthStar HDN and HDP encoders use magnetic coupling technology to eliminate the need for these components. The encoders are supplied with a “target” magnet in the form of a bolt or collar which can be affixed to the rotating shaft or equipment that requires position or speed sensing. In application, the target magnet need only be placed in relatively close proximity to the encoder, meaning a wide sensing envelope is possible. This allows for virtually maintenance-free operation, eliminating alignment issues that can cause coupling breakage, bearing damage, and seal wear.
Completely Sealed
Since there’s no shaft protruding from the encoder, there’s no seal. Elimination of this potential ingress point is a welcome benefit especially when dealing with washdown or very dirty environments. In addition, the electronics are completely sealed and encapsulated in a clear potting compound which allows visibility of status LED’s that monitor signal output. The encoder is rated for up to IP68 environmental protection depending upon the connector chosen.
Incremental or Absolute Output
Unlike many competitive encoders, the NorthStar HDN and HDP encoders are available in either incremental or absolute output format. Absolute single-turn resolution of 13 bits is standard on the HDN58, with a choice between analog 0-5VDC output or CAN Bus interface. Standard incremental quadrature output with or without complements is available up to 2048PPR depending upon model.
Price and Availability
The HDN58, HDP30, and HDP18 encoders are built to order and immediately available for the general market. List pricing starts at $545 for the HDN series and $595 for the HDP which features the form factor of a proximity sensor.
