Encoder Fan Tooth Design for UAV Rotation Detection
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Solution Overview
Problem
Current rotation parameter detection methods for electric motors in unmanned aerial vehicles (UAVs) rely on ABZ signals from three sensors, each with a failure rate, resulting in high failure rates and costs due to the need for multiple hardware switches.
Innovation Solution
An encoder with a code disc and processor that detects rotation parameters by using a code disc with radially extending fan teeth of varying arc lengths, generating distinct detection signals for rotation direction, speed, and mechanical zero position, reducing the number of required detection signals and hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If three sensors with hardware switches are used to detect rotation parameters via ABZ signals, then rotation direction, speed, and zero position can be detected, but the failure rate increases and cost increases due to multiple hardware components
Solution Approach 1:
The patent merges the functions of three separate sensors (A, B, and Z sensors) into a single sensor that detects all rotation parameters. The code disc is designed with fan teeth that generate distinct detection signals for rotation direction, speed, and mechanical zero position simultaneously, eliminating the need for multiple hardware switches and reducing system failure points.
Solution Approach 2:
The single sensor is designed to perform multiple detection functions that previously required three separate sensors. By using a universally functional detection system, the patent reduces hardware complexity while maintaining comprehensive rotation parameter monitoring capabilities.
2Measurement precision
If three sensors and hardware switches are used for ABZ signal detection, then complete rotation parameter information is obtained, but the device complexity and cost increase
Solution Approach 1:
The patent combines multiple detection functions into a single sensor system, eliminating the need for three separate hardware switches. The code disc structure with varying arc lengths enables one sensor to capture all necessary rotation parameters, significantly reducing hardware complexity.
Solution Approach 2:
The patent extracts and eliminates unnecessary hardware components (two of the three sensors and their associated hardware switches) while retaining complete rotation parameter detection capability through the optimized code disc design and single sensor system.
Data Source
AI summary
An encoder includes a code disc and a processor communicatively coupled with the code disc. The code disc is configured to rotate along with a rotating object and includes a plurality of fan teeth extending radially. One of the plurality of fan teeth is different from other ones of the plurality of fan teeth, and the other ones of the fan teeth are same to each other. A first portion of a detection signal that is generated in one rotation of the code disc, corresponding to the one of the plurality of fan teeth, is different from a second portion of the detection signal, corresponding to each of the other ones of the fan teeth. The processor is configured to detect the rotation of the code disc to obtain the detection signal and a rotation parameter of the rotating object based on the detection signal.