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Method of Determining A Direction of Rotation and Valid Transitions of Quadrature Pulses

A technology of rotating direction and signal, applied in the direction of converting sensor output, instrument, digital transmission system, etc., can solve the problem of slow software implementation

Active Publication Date: 2018-01-30
TEXAS INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hardware implementations for recognizing these relationships can be very efficient; software implementations are usually slower

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  • Method of Determining A Direction of Rotation and Valid Transitions of Quadrature Pulses
  • Method of Determining A Direction of Rotation and Valid Transitions of Quadrature Pulses
  • Method of Determining A Direction of Rotation and Valid Transitions of Quadrature Pulses

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Embodiment Construction

[0020] Specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the following detailed description of various embodiments of the invention, numerous specific details are set forth in order to provide a fuller understanding of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without these specific details. In other instances, well known features have not been described in detail in order to avoid unnecessarily complicating the description.

[0021] first go to Figure 4A , showing the sensor arrangement of a conventional quadrature encoder. In this example, a rotating disk 402 is attached to a shaft 404 of a device whose rotational speed and direction is to be tracked and / or controlled. Code tracks 406 run around the periphery of rotating disk 402 and are configured to alternately block and allow light to pass through the disk. When the ligh...

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PUM

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Abstract

A method of determining a direction of rotation of a shaft is disclosed, as well as an integrated circuit chip that uses the disclosed method. The method includes receiving a first binary signal and asecond binary signal from a transducer attached to the shaft, with the first and second binary signals being in quadrature. A present quadrant identification number, QIDPRESENT, is determined as a two-digit binary number by left-shifting a value of the first signal and adding a value of the second signal. After a sampling interval has elapsed, the method sets a past quadrant identification number, QIDPAST, to the value of said QIDPRESENT, determines a new value of QIDPRESENT and calculates a value of a transition code using an equation that operates on QIDPRESENT and QIDPAST. The method (318)uses the transition code to determine a direction of rotation of the shaft.

Description

technical field [0001] The disclosed embodiments relate generally to the field of tracking rotational motion, such as in electric motors. More specifically and not intended to be limiting, the present disclosure relates to methods of determining the direction of rotation and effective transition of quadrature pulses. Background technique [0002] Two basic types of encoders, or transducers, are used to convert the angular motion of a shaft or axle into a signal: quadrature and sinusoidal. These encoders use two sensors placed ninety electrical degrees apart to provide two quadrature signals, A and B, and an optional third sensor that provides an output reference once per revolution. Directional information is encoded in terms of the phase relationship between the signal pair; where input A leads or lags input B by 90 degrees. There are typically thousands of electrical cycles per revolution of the shaft. [0003] A quadrature encoder passes a pair of digital signals (A an...

Claims

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Application Information

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IPC IPC(8): G01D5/245
CPCG01D5/2451G01D5/363H04L27/38H04L25/4902
Inventor R·M·波莱
Owner TEXAS INSTR INC