Brushless Motor Hall Board O-Ring Mounting for Precise Assembly
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Solution Overview
Problem
Existing brushless electric motors in handheld power tools face challenges in assembly and disassembly due to traditional screw connections or hot-caulking methods, which increase assembly costs and make Hall board removal difficult.
Innovation Solution
The Hall board is axially fixed to the end plate using an elastic O-ring, reducing assembly costs and ensuring exact axial positioning through clamping action, with the end plate and stator potentially being integrally formed and featuring a central bearing with radial retaining webs and supporting collars for secure O-ring contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If screw connection is used to fasten the Hall board, then the Hall board is securely fixed, but assembly expenditure increases
Solution Approach 1:
The patent extracts the fastening function from the screw connection system and implements it through an elastic O-ring that combines securing and positioning functions. The O-ring is placed in a groove on the end plate, eliminating the need for separate screws while achieving reliable fixation of the Hall board.
2Reliability
If hot-caulking is used to fasten the Hall board, then the Hall board is securely fixed, but removal without destruction becomes difficult
Solution Approach 1:
The patent removes the permanent bonding characteristic of hot-caulking and replaces it with an elastic O-ring in a groove that allows for easy removal. The elastic material provides secure fixing during operation but permits straightforward拆卸 when needed, enabling maintenance and repair without destruction.
3Reliability
If traditional fastening methods are used, then the Hall board is fixed, but exact axial positioning is not ensured
Solution Approach 1:
The patent introduces an elastic O-ring as an intermediary element between the end plate and Hall board. This O-ring not only provides securing force but also acts as a positioning element that ensures exact axial positioning of the Hall board, combining fixation and positioning functions in one component.
4Reliability
If multiple fastening methods are used, then the Hall board is securely fixed, but device complexity increases
Solution Approach 1:
The patent merges the securing function and positioning function into a single elastic O-ring component. This unified solution eliminates the need for multiple separate fastening elements, reducing device complexity while maintaining reliable fixation and precise axial positioning of the Hall board.
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 simplifies assembly and disassembly while ensuring precise positioning of the Hall board, reducing costs and enhancing the compact construction of the motor.
Implementation Method 1
the Hall board is axially fixed to the end plate by means of an elastic O-ring
Data Source
AI summary
Brushless electric motor for an electric handheld power tool, wherein the electric motor has an end plate and a Hall board which is arranged on the end plate, wherein the Hall board is axially fixed to the end plate by an elastic O-ring.