System and method for monitoring output signals of an encoder

Abstract

To detect actual deterioration from digital pulse signals output from an encoder in which the wave period, duty cycle, phase difference and phase direction vary according to the operating speed, resolution and movement direction and are difficult to determine, which makes it difficult to detect deterioration, and to eliminate the wasted time and expense for the maintenance involved in taking the necessary measures. A system and a method for monitoring output signals of an encoder, in which an output signal output from an encoder body 1 corresponding to a basic operation pattern of an object 20 being measured which is set in an initial state is associated with the basic operation pattern and stored in a storage device 30; the object 20 being measured is then operated in accordance with the basic operation pattern at fixed intervals; an output signal output from the encoder body 1 at that time and output signal data in the initial state stored in the storage device 30 are compared, and a warning is output if the difference between the two signals is greater than a fixed magnitude.

Description

technical field [0001] The present invention relates to an encoder output signal monitoring system and an encoder output signal monitoring method for detecting deterioration of an encoder, wherein the encoder converts the state of a rotating disc or a linear scale into an electrical signal and measures an object to be measured amount of displacement or movement. Background technique [0002] An encoder converts, for example, the state of a rotating disc or a linear scale into an electrical signal. For example, in an optical rotary encoder, light emitted by a light-emitting element is transmitted through a rotating disk, and the signal received by a light-receiving element is converted into a rectangular-wave digital pulse output signal by a signal processing unit. [0003] Also, like other electronic equipment and precision equipment, encoders deteriorate over time and cannot maintain their original performance. The main causes of encoder deterioration are, mechanically, d...

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Problems solved by technology

[0005] On the other hand, there are many disadvantages as follows: In order to monitor the analog signal inside the encoder, a dedicated output line for maintenance is required, and a circuit for analog signal monitoring is additionally provided, and the number of parts increases or the structure becomes complicated, which reduces the manufacturing cost. increases, but becomes prone to failure, etc.

[0011] The problem to be solved is that the output signal from the encoder deteriorates due to changes over time, but in the case of an encoder that outputs a rectangular wave-shaped digital pulse signal obtained by shaping the analog signal, the operating speed, The cycle, ratio (duty cycle), phase difference, and phase direction of the waveform are different due to the resolution and moving direction, making it difficult to judge and detect deterioration

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