Netzger: Miniature Absolute Rotary Encoder

Jan. 13, 2014
The DS-25 Electric Encoder provides generous mounting tolerance, obviating the need for internal ball bearings.

The lack of bearings and components such as flexible couplers, glass discs, light sources and detectors, along with very low power consumption (180 mA at 5 VDC) makes the encoder virtually failure free. The internally-shielded unit includes an electric field generator, a field receiver, a sinusoidal shaped dielectric rotor, and processing electronics. Outputs are analog sine/cosine representing the rotation angle, incremental or absolute position., plus digital SSi or Digital AqB+I. Features include small size (7 mm profile) and light weight (total weight of 4 g); hollow, floating shaft; no bearings or other contacting elements; 17-bit resolution, with accuracy of less than 0.025º; operating temperature range of -40 to +85 ºC; and resistance to shock -100 g (11 ms), moisture and EMI/RFI. The units are insensitive to magnetic fields. Suggested applications include aerospace, medical, instrumentation, automation, etc.

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