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Browse Prior Art Database

Magnetic Vernier For Shaft Digitizer

IP.com Disclosure Number: IPCOM000098687D
Original Publication Date: 1959-Oct-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Knox, LA: AUTHOR

Abstract

The figure shows an analog shaft to electrical digital converter having both a coarse and vernier readout so that electrical digital information can be obtained for shaft rotations of very small segments of an arc.

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Magnetic Vernier For Shaft Digitizer

The figure shows an analog shaft to electrical digital converter having both a coarse and vernier readout so that electrical digital information can be obtained for shaft rotations of very small segments of an arc.

The coarse readout is obtained by the cooperation of electrical brushes 1 with conducting and nonconducting surfaces forming rings on the face of disk 2 in a conventional manner. On the periphery of disk 2 are placed first and second rows of segments 3 of magnetizable material constructed to create a variable reluctance path for generating approximate sine wave vernier voltages in associated magnetic head assemblies as the disk is rotated. The first and second rows of magnetic segments 3 are displaced so that the voltage generated in the adjacent head assemblies is displaced by 90 electrical degrees. If each row has two magnetic head assemblies 4 and 5 cooperating at diametrically opposite positions on the periphery and the electrical output of each head assembly cooperating with each row is connected in series, a voltage with a sine function is generated by one row of magnetic segments. Similarly, a voltage with a cosine function is generated by the other row.

The approximate sine wave voltage is amplified and applied to one input of a conventional tangent solver 6. The approximate cosine wave voltage is amplified and applied to the other input of tangent solver 6. An electrical output is derived by the tangent sol...