Life detection device for encoder

A life detection device for an encoder used for the encoder including a scale and a head, the scale being housed in a scale frame, the head relatively moving along the scale to detect an amount of relative movement with the scale, the life detection device for the encoder comprising:

• environmental condition detection means configured to detect an environmental condition related to life detection in the encoder;
• life determination means configured to determine a life of a component constituting the encoder based on a detection result by the environmental condition detection means;
• and
• informing means configured to inform the life based on a determination result by the life determination means, wherein
• the environmental condition detection means includes:
• a humidity detection unit configured to detect a humidity as the environmental condition;
• a cumulative total time measurement unit configured to measure a cumulative total operating time of the encoder;
• and
• a cumulative total humidity measurement unit configured to measure a cumulative total humidity in the cumulative total operating time, wherein
• the life detection device includes
• computing means configured to compute an average humidity value using the cumulative total operating time and the cumulative total humidity, and
• the life determination means is configured to determine the life of the component based on the cumulative total operating time and the average humidity value.

A life detection device for an encoder used for the encoder including a scale and a head, the scale being housed in a scale frame, the head relatively moving along the scale to detect an amount of relative movement with the scale, the life detection device for the encoder comprising:

• environmental condition detection means configured to detect an environmental condition related to life detection in the encoder;
• life determination means configured to determine a life of a component constituting the encoder based on a detection result by the environmental condition detection means;
• and
• informing means configured to inform the life based on a determination result by the life determination means, wherein
• the environmental condition detection means includes:
• an environment detection unit configured to detect a temperature, a humidity, and a current as the environmental condition as a detection result;
• a cumulative total time measurement unit configured to measure a cumulative total operating time of the encoder;
• and
• a cumulative total result measurement unit configured to measure a cumulative total result of the detection result detected by the environment detection unit in the cumulative total operating time, wherein
• the life detection device includes:
• computing means configured to compute an average value of each of the temperature, the humidity, and the current using the cumulative total operating time and the cumulative total result;
• and
• storage means that stores a plurality of failure rate functions for calculating a failure rate of the encoder, wherein
• the life determination means is configured to:
• extract an optimal failure rate function to calculate the failure rate from the plurality of failure rate functions stored in the storage means based on the average value and the cumulative total operating time;
• calculate the failure rate based on the optimal failure rate function and the cumulative total operating time;
• and
• determine the life of the component based on the failure rate.

A life detection device for an encoder used for the encoder including a scale and a head, the scale being housed in a scale frame, the head relatively moving along the scale to detect an amount of relative movement with the scale, the life detection device for the encoder comprising:

• environmental condition detection means configured to detect an environmental condition related to life detection in the encoder;
• life determination means configured to determine a life of a component constituting the encoder based on a detection result by the environmental condition detection means;
• and
• informing means configured to inform the life based on a determination result by the life determination means, wherein
• the environmental condition detection means includes:
• an environment detection unit configured to detect a temperature, a humidity, and a current as the environmental condition as a detection result;
• a cumulative total time measurement unit configured to measure a cumulative total operating time of the encoder;
• and
• a cumulative total result measurement unit configured to measure a cumulative total result of the detection result detected by the environment detection unit in the cumulative total operating time, wherein
• the life detection device includes:
• computing means configured to compute an average value of each of the temperature, the humidity, and the current using the cumulative total operating time and the cumulative total result;
• and
• a matrix calculation table to which the average value is inputtable, the average value being to derive an optimal failure rate function for calculating a failure rate of the encoder, wherein
• the life determination means is configured to:
• calculate the failure rate based on the optimal failure rate function derived from the matrix calculation table and the cumulative total operating time;
• and
• determine the life of the component based on the failure rate.