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Pseudo Absolute Position Encoder for Electromechanical Positioning Devices

IP.com Disclosure Number: IPCOM000039799D
Original Publication Date: 1987-Aug-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Kloss, MA: AUTHOR [+3]

Abstract

A technique is described whereby an incremental positioning encoder, as used in the electromechanical positioning devices, is designed in such a way so as to perform as an absolute encoder. A microprocessor circuit is incorporated, in conjunction with an incremental positioning encoder, which converts serial pulse streams from the incremental encoder into absolute positioning information. This enables the incremental encoder, as it appears to the main drive controller, to function as an absolute controller. Typically, incremental positioning encoders are used instead of absolute encoders because of cost considerations: however, they create several problems. Information, such as the established position of the device, is lost when electrical power is turned off or lost during a power failure.

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Pseudo Absolute Position Encoder for Electromechanical Positioning Devices

A technique is described whereby an incremental positioning encoder, as used in the electromechanical positioning devices, is designed in such a way so as to perform as an absolute encoder. A microprocessor circuit is incorporated, in conjunction with an incremental positioning encoder, which converts serial pulse streams from the incremental encoder into absolute positioning information. This enables the incremental encoder, as it appears to the main drive controller, to function as an absolute controller. Typically, incremental positioning encoders are used instead of absolute encoders because of cost considerations: however, they create several problems. Information, such as the established position of the device, is lost when electrical power is turned off or lost during a power failure. The technique described herein uses an incremental encoder, combined with a microprocessor circuit, to enable the incremental encoder to function as an absolute encoder and provide absolute positioning information to the main controller. The concept not only, reduces the overall cost of encoding, as compared to the prior art of absolute encoders, but also reduces the overall physical size of the encoder. The microprocessor circuit 10, as shown in the figure, uses micro- controller 11, similar to an 8048 chip, which contains its own clock circuit, random-access memory (RAM), read-only memory (ROM) and input/ output (I/O) circuit lines. The serial pulse stream information from incremental encoder 12 is converted into absolute information. This absolute...