US 2025/0085141 A1Published application

Automatic calibration of encoders

AssigneeAvago Technologies International Sales Pte. Limited

InventorsChilds Chang, Kheng Hin Toh, Heem Leong Ong, Wei Keat Yew, Thomas Theil

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Abstract

Novel tools and techniques are provided for implementing an encoder capable of performing a self-calibration process, and more particularly methods, systems, and apparatuses are provided for implementing an encoder capable of performing a process to calibrate itself using a moving average algorithm. In various embodiments, the encoder includes an exciter and a sensor capable of detecting a position of the exciter and generating a signal based on the position of the exciter. The encoder can then perform one or more steps to calibrate itself using a moving average algorithm to account for variations in a rotation speed of the encoder.

Claims20

Dependent claims

An encoder comprising:

an exciter;
a sensor configured to detect a position associated with the exciter and generate a signal based on the position;
and
a controller configured to run a process to calibrate the encoder, the process comprising:
detecting a rotation of the exciter;
receiving the signal from the sensor;
detecting a first position of the exciter and a second position of the exciter based on the signal for a first rotation cycle;
after completing the first rotation cycle, dividing the first rotation cycle into two or more first segments and determining for a first segment of the two or more first segments a first time to rotate the exciter through the first segment;
detecting a third position of the exciter and a fourth position of the exciter based on the signal for a second rotation cycle;
after completing the second rotation cycle, dividing the second rotation cycle into two or more second segments and determining for a corresponding first segment of the two or more second segments a second time to rotate the exciter through the corresponding first segment, wherein the corresponding first segment corresponds to the first segment of the first rotation cycle;
determining that the first time is within a first predetermined threshold of the second time;
and
based on a determination that the first time is within the first predetermined threshold of the second time, calibrating the signal of the sensor.

10 more elements

A method for calibrating an encoder, the method comprising:

detecting a rotation of an exciter of the encoder;
detecting a signal from a sensor of the encoder, wherein the sensor detects a position associated with the exciter and generates the signal based on the position;
detecting a first position of the exciter and a second position of the exciter based on the signal for a first rotation cycle;
after completing the first rotation cycle, dividing the first rotation cycle into two or more first segments and determining for a first segment of the two or more first segments a first time to rotate the exciter through the first segment;
detecting a third position of the exciter and a fourth position of the exciter based on the signal for a second rotation cycle;
after completing the second rotation cycle, dividing the second rotation cycle into two or more second segments and determining for a corresponding first segment of the two or more second segments a second time to rotate the exciter through the second segment, wherein the corresponding first segment corresponds to the first segment;
determining that the first time is within a first predetermined threshold of the second time;
and
based on a determination that the first time is within the first predetermined threshold of the second time, calibrating the signal of the sensor.

6 more elements

An encoder comprising:

an exciter;
a sensor configured to detect a position associated with the exciter and generate a signal based on the position;
and
a processor configured to:
detect a rotation of the exciter;
receive the signal from the sensor;
determine one or more variations in a rotation speed of the exciter exceed a first predetermined threshold;
based on a determination that the one or more variations exceed the first predetermined threshold, divide a rotation cycle of the exciter into two or more segments;
detect a first position of the exciter for a first segment of the two or more segments based on the signal;
determine a first time to rotate the exciter from the first position to a second position of the first segment;
detect the exciter has reached a third position between the first position and the second position of the first segment based on the signal, wherein the third position for the first segment is determined using a moving average algorithm;
determine a second time to rotate the exciter to the third position, wherein the second time is an actual time to rotate the exciter to the third position;
calculate a third time to rotate the exciter to the third position between the first position and the second position based on the first time, wherein the third time is an expected time to rotate the exciter to the third position;
and
calculate a first value to correct the signal generated by the sensor for the third position based on a deviation between the second time and the third time.

12 more elements

Dependencies are inferred from the claim text.