Angular Positioning Arrangement for Resolver Rotor
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Solution Overview
Problem
Existing angular positioning arrangements for rotors of resolvers or position sensors associated with rotary shafts fail to securely and accurately maintain the rotor's angular position relative to the shaft, leading to incorrect position information and potential misalignment with the stator, and lack a simple method for rotor replacement.
Innovation Solution
A collar with a spline formation and axial ribs is used to resist angular movement between the collar and rotor, combined with a clamp arrangement featuring a lock nut to securely position and align the rotor, allowing for easy installation and removal by deforming the rotor to prevent relative rotation and axial movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rotor is secured to the shaft using deformation of shaft material into slots, then the rotor is firmly secured against relative movement, but the process is complex and time-consuming
Solution Approach 1:
A collar is introduced as an intermediary component between the shaft and rotor. The collar includes a formation that cooperates with a corresponding formation on the shaft to prevent relative angular movement, and axial ribs that deform the rotor to resist relative rotation. This mediator simplifies the overall positioning arrangement while maintaining secure connection.
Solution Approach 2:
The positioning arrangement is divided into distinct functional components: the collar with spline formations for angular positioning, axial ribs for radial securing through deformation, and a clamp arrangement with lock nut for axial clamping. This segmentation allows each component to perform its specific function efficiently.
2Reliability
If the rotor is firmly secured to the shaft, then position information accuracy is maintained, but rotor replacement becomes difficult
Solution Approach 1:
The clamp arrangement provides a dynamic securing mechanism that can be easily adjusted or released. The lock nut can be loosened to release the clamp member, allowing the collar to be removed from the shaft and rotor to be replaced, while maintaining firm securing during operation.
Solution Approach 2:
The positioning arrangement is divided into distinct functional components: the collar with spline formations for angular positioning, axial ribs for radial securing through deformation, and a clamp arrangement with lock nut for axial clamping. This segmentation allows each component to perform its specific function efficiently.
3Measurement precision
If the rotor position is adjusted to align markings, then accurate angular positioning is achieved, but the installation process is time-consuming
Solution Approach 1:
The collar is pre-formed with axial ribs that, upon axial movement, automatically deform the rotor to the correct angular position. The spline formations on the collar and shaft are pre-configured to engage at the correct angular orientation, eliminating the need for manual marking and alignment adjustments during installation.
Solution Approach 2:
The manual marking and alignment process is replaced by a mechanical system where the spline formations and axial ribs automatically establish the correct angular position through their geometric design and deformation action during collar installation.
4Reliability
If the collar is secured to the shaft with axial clamping force, then the rotor is firmly held, but the clamp arrangement becomes complex
Solution Approach 1:
The clamp member and collar are combined into a single integrated component. The clamp member is keyed to the collar against angular movement, and the lock nut threads directly onto the shaft to clamp the integrated assembly. This merging reduces the number of separate parts and simplifies the clamp arrangement while maintaining reliable axial clamping.
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
The solution provides a secure, accurate angular positioning of the rotor relative to the shaft, ensuring precise alignment and preventing movement, while allowing for easy removal and replacement, thus maintaining sensor output accuracy and facilitating maintenance.
Implementation Method 1
an external, generally axially extending rib cooperable with a part of the rotor to deform the said part of the rotor to resist relative rotation between the collar and the rotor
Implementation Method 2
a lock nut threadingly engaged with the shaft and serving to clamp the clamp member to the collar to prevent or resist axial movement
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A positioning arrangement is disclosed for positioning a rotor (12) relative to a shaft (14), the positioning arrangement comprising a collar (16) provided with a formation (18) cooperable with a corresponding formation (20) provided upon the shaft (14) to resist relative angular movement between the collar (16) and the shaft (14), the collar (16) being provided with an external, generally axially extending rib (22) cooperable with a part (24a) of the rotor (12) to deform the said part (24) of the rotor (12) to resist relative rotation between the collar (16) and the rotor (12).