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Pseudo-absolute position sensing algorithm

An algorithm and angular position technology, applied in the field of position sensing algorithm, can solve the problems of expensive, complicated and heavy RVDT system

Active Publication Date: 2015-05-20
EATON INTELLIGENT POWER LIMITED
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  • Claims
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Problems solved by technology

Further, RVDT systems can be relatively complex, heavy and expensive

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  • Pseudo-absolute position sensing algorithm
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Embodiment Construction

[0009] A pseudo-absolute position sensing algorithm according to one aspect of the teachings uses two rotational position sensors to calculate the position output of a mechanical system using the mechanical ratio between two or more rotational axes. In one example, the algorithm uses a gear ratio relationship to calculate the position of the final output stage of an electromechanical system, which can be anything that uses a gear train to convert a rotary input to a mechanical output (e.g., linear output, rotary output, etc.) system. Once the system has been calibrated, and as long as the mechanical relationship of the sensors remains constant, the algorithm calculates the current position.

[0010] figure 1 One possible electromechanical actuator (EMA) system is shown, generally indicated at 10 . The EMA system 10 may have a gear train having at least a first gear, a first absolute rotary encoder to sense the angular position of the first gear, a second gear, and a second g...

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Abstract

A system having a position sensing algorithm for determining a position of an electro¬ mechanical actuator (EMA) stroke includes a first rotary component supported for rotation about a first axis, and a second rotary component supported for rotation about a second axis. A first rotary encoder may be configured to generate an output based on an angular position of the first rotary component, and a second rotary encoder may be configured to generate an output based on an angular position of the second rotary component. The first and second rotary components may define a ratio such that the first and second rotary encoders generate unique combinations of outputs for an entire stroke of an EMA. A decoder may be provided having a position sensing algorithm that determines a position of the EMA stroke based on the ratio between first and second rotary components and outputs from first and second encoders.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Application Serial No. 61 / 704,057, filed September 21, 2012, which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to position sensing algorithms, including position sensing algorithms that use rotational position sensors to calculate a position output of a mechanical system. Background technique [0004] It is known to use a rotary variable differential transformer (RVDT) to measure the angular displacement of the shaft. In general, an RVDT is a power transformer that includes a rotor supported for rotation within a housed stator assembly. The RVDT provides an output voltage that is linearly proportional to the angular displacement of the shaft. However, when used to determine the absolute position of an electromechanical actuator (EMA), RVDT systems typically use an anti-backlash gear train associated w...

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Application Information

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IPC IPC(8): G01D5/04
CPCG01D5/04Y10T74/19F16H35/16G01D5/14
Inventor D·P·多尔蒂J·M·怀特A·汤普森
Owner EATON INTELLIGENT POWER LIMITED