Swivel Core Rotor Angle Calibration With a Single Sensor
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Solution Overview
Problem
Conventional swivel core systems in vehicles face challenges with accurate rotation angle sensing and control due to the lack of a physical stopper or reference structure, leading to increased installation costs, manufacturing costs, and error accumulation, resulting in misalignment and malfunctions.
Innovation Solution
A rotation angle sensing system for swivel cores that utilizes a single rotation sensing device installed on the stator, coupled with a hill-shaped identifier on the rotor, which generates a sensing signal to calibrate the standard position, allowing for accurate control of the rotation angle and preventing error accumulation through a solenoid locking device and control part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If limit switches are installed at the beginning and end of a conventional stroke, then rotation position control is enabled, but installation cost and manufacturing cost increase due to requiring at least two limit switches
Solution Approach 1:
The patent combines multiple functions into a single rotation sensing device that simultaneously serves as both a limit switch and a rotation angle sensor. This single device detects both the extreme positions (beginning and end of stroke) and the rotation angle throughout the motion range, eliminating the need for separate limit switches and reducing the total sensor count from two or more to just one.
Solution Approach 2:
The rotation sensing device is designed with multi-functionality, serving both as a limit switch for detecting extreme positions and as a rotation angle sensor for continuous position monitoring. This universal device replaces the conventional separate limit switches, reducing system complexity while maintaining both position control and rotation sensing capabilities.
2Adaptability or versatility
If no stopper or reference structure is installed, then the swivel core can be rotated infinitely, but accurate sensing of rotation angle and control of rotation position becomes difficult
Solution Approach 1:
The patent introduces a hill-shaped identifier as an intermediary reference structure on the rotor that works with the rotation sensing device. This identifier serves as a reference point that enables accurate rotation angle sensing and position control without physically restricting the rotation range. The hill-shaped structure provides a detectable reference signal that allows the system to maintain measurement precision while preserving infinite rotation capability.
3Ease of operation
If the swivel core is repeatedly rotated forward or backward multiple times, then operational flexibility is improved, but errors accumulate with each rotation causing position misalignment and malfunction
Solution Approach 1:
The rotation sensing device provides continuous feedback on the rotation angle and position throughout repeated rotations. This feedback mechanism allows the control system to monitor and correct for any accumulated errors, maintaining position accuracy even after multiple forward and backward rotations. The hill-shaped identifier serves as a reference point that helps reset and recalibrate the position information periodically.
Solution Approach 2:
The system performs preliminary calibration by using the hill-shaped identifier as a reference point to establish accurate position information before each operation cycle. This preliminary action of setting the reference position based on the identifier prevents error accumulation from occurring in the first place, ensuring position accuracy is maintained throughout repeated rotations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution reduces installation costs by using a single sensor, enables accurate rotation position control, and prevents malfunctions by calibrating the rotor's standard position at initial installation or when necessary, ensuring precise operation.
Implementation Method 1
the rotation sensing device may be a contact sensor sensing contact with the identifier
Data Source
AI summary
The present disclosure relates to a rotation angle sensing system and method of swivel core that enables recognition of an accurate standard position of a rotor, may include a rotation sensing device installed on a stator of the swivel core and sensing rotation state of a rotor of the swivel core; and an identifier formed on the rotor to generate a sensing signal of the rotation sensing device, wherein the standard position of the rotor can be calibrated or initialized by only one rotation sensing device, thereby decreasing the number of sensors to be installed, reducing installation cost or manufacturing cost and accurately sense a standard position by forming a hill part as an identifier on the inner surface of the rotor.