Motor Clamp Integrating Detection Pattern for Assembly
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Solution Overview
Problem
Conventional mirror rotary devices face challenges in manufacturing efficiency and increased costs due to the need for precise positioning of components, which complicates the assembly and increases the number of parts, leading to higher manufacturing costs.
Innovation Solution
A motor design with a stationary unit and a rotation unit that includes a rotor hub with a first magnet and a clamp with a detection pattern, allowing for accurate positioning and reduced part count by integrating the detection function into the clamp, which presses the mirror unit and supports it radially, enabling easier assembly and reduced manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the FG magnet and FG pattern are mounted in a minute gap between the rotor case and substrate with high precision positioning, then the synchronization signal detection is accurate, but the assembly operation becomes difficult and manufacturing efficiency is reduced
Solution Approach 1:
The invention moves the detection pattern from the substrate (bottom dimension) to the clamp (top dimension), allowing the pattern to be positioned on the upper surface of the clamp rather than in the minute gap between rotor case and substrate. This dimensional relocation enables easier access for assembly while maintaining detection accuracy.
Solution Approach 2:
The invention integrates the detection pattern directly onto the clamp structure, combining the clamping function and detection function into a single component. This merging eliminates the need for separate FG magnet and FG pattern components in the minute gap, simplifying assembly while maintaining synchronization signal detection capability.
2Measurement precision
If the FG magnet and FG pattern are positioned with high precision in the minute gap, then the synchronization signal detection is accurate, but the number of parts increases and manufacturing cost increases
Solution Approach 1:
The invention combines the detection pattern with the clamp into a single integrated component. The clamp serves dual purposes: mechanically securing the mirror unit and providing the detection pattern for synchronization signal detection. This integration reduces the total number of parts while maintaining detection accuracy.
Solution Approach 2:
The clamp is designed with multi-functionality, serving both as a mechanical fastening element and as a carrier for the detection pattern. This universal design eliminates the need for separate dedicated detection components, reducing part count while maintaining the synchronization detection function.
3Productivity
If the detection pattern is positioned on the clamp rather than in the minute gap, then the assembly process is simplified and manufacturing efficiency is improved, but the detection precision must be maintained
Solution Approach 1:
The detection pattern is relocated from the constrained minute gap dimension to the accessible upper surface dimension of the clamp. This dimensional change allows for easier assembly and manufacturing while the pattern's geometric features maintain the necessary detection precision for synchronization signal generation.
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 motor design enhances manufacturing efficiency by simplifying the assembly process, reducing the number of parts, and improving detection accuracy while maintaining high precision in positioning the mirror unit, thus lowering overall costs.
Implementation Method 1
a first magnet being opposite to the stator, and expands in an annular shape around the central axis
Implementation Method 2
a clamp that is directly or indirectly fixed to the rotor hub farther radially inside than the annular body and that presses the annular body to an axially lower side
Implementation Method 3
the clamp is provided with a pattern to be detected to detect rotation of the rotation unit, and the pattern to be detected is positioned in a circumferential direction with the central axis as the center on a surface of the clamp
Data Source
AI summary
A motor includes a stationary unit and a rotation unit. The rotation unit includes a rotor hub, an annular body, and a clamp. The rotor hub is mounted with a first magnet opposite to the stator. The annular body is supported on an outer circumferential portion of the rotor hub. The clamp is directly or indirectly fixed to the rotor hub farther radially inside than the annular body, and presses the annular body to an axially lower side. The rotor hub includes a flange that expands radially outside from at least a portion excluding an upper end portion. On a surface of the clamp, a pattern to be detected to detect rotation of the rotation unit positioned in a circumferential direction with the central axis as the center is provided. The annular body is sandwiched between the flange and the clamp in an axial direction.