Torque Motor Direct Drive for X-ray Detector Positioning
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Solution Overview
Problem
X-ray devices face challenges in achieving high positioning accuracy during the rotation of radiation detectors, leading to poorer image quality due to mechanical transmission elements like gearwheels, which introduce backlash and inaccuracies.
Innovation Solution
A torque motor with a stator and rotor is used as a direct drive system, eliminating mechanical transmission elements and providing high torsional stiffness and backlash-free movement, allowing the radiation detector to be coupled directly to the rotor for precise rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a geared motor with mechanical transmission elements is used to rotate the radiation detector, then the detector can be rotated, but positioning accuracy deteriorates due to backlash and mechanical inaccuracies
Solution Approach 1:
The patent removes mechanical transmission elements (gears, gearwheels) from the drive system. By extracting these components and replacing them with a direct-drive torque motor, the system eliminates backlash and mechanical inaccuracies that degrade positioning accuracy, achieving 0.02 angular degrees or less precision.
Solution Approach 2:
The patent replaces the mechanical transmission system (geared motor with gears) with an electromagnetic direct-drive system (torque motor). This substitution eliminates mechanical backlash and transmission errors, providing high torsional stiffness and precise positioning without mechanical intermediaries.
2Reliability
If mechanical transmission elements like gearwheels are used in the drive, then rotation can be achieved, but image quality worsens due to positioning inaccuracies
Solution Approach 1:
The patent replaces the mechanical transmission system with a direct-drive torque motor system. This substitution eliminates mechanical backlash and positioning errors that would otherwise degrade image quality during detector rotation, ensuring high reliability and accurate image recording.
3Measurement precision
If a torque motor with large rotor diameter is used, then positioning accuracy improves, but device size increases
Solution Approach 1:
The patent utilizes the relationship between rotor diameter and torque output in torque motors. By increasing the rotor diameter parameter, the system achieves higher torque production, which enables precise positioning (0.02 angular degrees or less) while maintaining the direct-drive configuration without mechanical transmission elements.
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 achieves positioning accuracy of 0.02 angular degrees or less, ensuring accurate and reproducible rotation of the detector, enhancing image quality by eliminating mechanical inaccuracies.
Implementation Method 1
A torque motor that includes a stator and a rotor... The torque motor includes a stator and a rotor. The stator is fixed in position relative to the C-bracket, and the rotor rotates relative to the stator
Data Source
AI summary
An X-ray device includes a C-bracket having a radiation detector rotatably mounted on the C-bracket. The radiation detector may be rotated by a motor drive. The axis of rotation is perpendicular to the detector surface. The motor drive is a torque motor that includes a stator and a rotor. The radiation detector is coupled to the rotor.