LiDAR Motor Module Shaft Structure for Bearing Alignment
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Solution Overview
Problem
The existing LiDAR motor module's rotating shaft has low machining accuracy due to interference from the rotor bracket during grinding, leading to issues with bearing parallelism and overall reliability.
Innovation Solution
The rotor bracket is designed with a flange portion perpendicular to the rotating shaft, allowing for precise grinding and improved bearing alignment through the use of a sleeve, enhancing the parallelism and coaxiality of bearings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the rotor bracket is integrated with the rotating shaft to provide space for components and compress height, then the structural compactness is improved, but the machining accuracy of the rotating shaft deteriorates due to interference during grinding
Solution Approach 1:
The rotor is divided into separate components: the rotating shaft and the rotor bracket are no longer integrated. The rotating shaft can be independently machined with high precision, while the rotor bracket is a separate component that provides space for electronics and magnets. This segmentation eliminates the interference problem during grinding while maintaining the compact structure through separate assembly.
2Device complexity
If the rotating shaft is only lathe-processed to ensure side accuracy, then the structural simplicity is improved, but the manufacturing precision deteriorates due to inability to use high-precision grinding
Solution Approach 1:
By separating the rotating shaft from the rotor bracket, the rotating shaft becomes an independent component that can be subjected to high-precision grinding operations without interference. This allows the use of superior machining processes (grinding instead of only lathe processing) while keeping the overall structure relatively simple through modular design.
3Length of stationary object
If the rotor bracket extends to compress the height of the motor module, then the compactness is improved, but the machining accessibility of the rotating shaft deteriorates
Solution Approach 1:
The separation of the rotating shaft and rotor bracket allows the rotating shaft to be machined independently before assembly. The rotor bracket can then be designed to extend and compress the overall height without interfering with the machining of the rotating shaft, as the shaft is already precision-machined and assembled into the stator housing.
Solution Approach 2:
The rotating shaft is precision-machined (including grinding) before the rotor bracket is attached. This preliminary action ensures that the shaft achieves its final high-precision dimensions and surface finish before the rotor bracket is installed, eliminating any subsequent interference with machining operations.
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 design improves the machining accuracy of the rotating shaft, reduces wear and abnormal sounds, and increases the reliability and service life of the bearings, ensuring smooth operation and enhanced scanning capabilities.
Implementation Method 1
The electromagnetic assembly includes a winding installed on the stator and a magnet installed on the rotor, and the two are configured to cooperate to drive the rotor to rotate relative to the stator
Implementation Method 2
The rotating shaft extends into the first mounting hole and is rotatable connected to the stator through a bearing
Data Source
AI summary
A motor module includes a stator, a rotor, a rotor bracket and an electromagnetic assembly. The stator is provided with a first mounting hole extending in a preset direction. The rotor includes a rotating shaft and a flange portion, the rotating shaft extends into the first mounting hole, and is rotatable connected to the stator through a bearing, the rotating shaft includes a third end and a fourth end opposite to each other in a preset direction, and the third end extends out of the first mounting hole; the flange portion is formed by extending outward from the outer wall of the third end along a plane perpendicular to the preset direction.