Electric Toothbrush Motor Assembly With Stable Position Feedback Mounting
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Solution Overview
Problem
The mounting of the position feedback member in existing electric toothbrush motor assemblies is not stable enough, leading to poor control effects on the brush head assembly due to inadequate mounting stability and potential damage during the mounting process.
Innovation Solution
A motor assembly design that includes a mounting seat fixedly sleeved on the output shaft with a mounting slot for the position feedback member, allowing it to be rotatable and improving stability, along with a position sensor positioned to detect the motion of the feedback member, enhancing the reliability of position detection and control over the brush head assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the position feedback member is mounted directly on the output shaft without a mounting seat, then the device complexity is reduced, but the mounting stability deteriorates leading to poor control effect
Solution Approach 1:
A mounting seat is introduced as an intermediary component between the output shaft and the position feedback member. The mounting seat defines a connection hole that fits on the output shaft and a mounting slot that receives the position feedback member, providing stable mounting while maintaining reasonable structural complexity.
Solution Approach 2:
The mounting structure is segmented into distinct functional parts: the mounting seat that interfaces with the output shaft, the mounting slot that secures the position feedback member, and the connection hole that provides rotational coupling. This segmentation allows each component to perform its specific function optimally.
2Reliability
If the position feedback member is mounted with tight fixation, then the mounting stability is improved, but the position feedback member may be damaged during mounting
Solution Approach 1:
The mounting slot is designed with sufficient width to accommodate the position feedback member during the mounting process, preventing excessive squeezing forces. The slot provides a cushioning effect that absorbs mounting stresses before they reach the position feedback member, ensuring both stable mounting and component integrity.
3Device complexity
If the position sensor is positioned close to the mounting seat, then the device complexity is reduced, but the position detection reliability deteriorates
Solution Approach 1:
The position sensor is positioned at a specific distance from the mounting seat, creating an optimal detection zone. This spatial arrangement ensures that the sensor can accurately detect the motion position of the position feedback member without interference from the mounting structure, achieving reliable detection with simple sensor placement.
Data Source
AI summary
A motor assembly for an electric toothbrush, a brush handle assembly for an electric toothbrush, and an electric toothbrush. The motor assembly includes: a motor body, a mounting seat, a position feedback member, and a position sensor. The motor body is arranged with an output shaft. The mounting seat defines a connection hole; wherein the mounting seat is fixedly sleeved on the output shaft through the connection hole to be rotatable with the output shaft; the mounting seat further defines a mounting slot disposed on a peripheral side of the connection hole. The position feedback member is arranged at the mounting slot to be rotatable with the output shaft. The position sensor is spaced apart from the mounting seat and disposed on a side toward which an opening of the mounting slot is oriented; the position sensor is configured to detect a motion position of the position feedback member.