Resolver Stator Mounting for High Positional Accuracy
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Solution Overview
Problem
Existing resolver stator mounting techniques face challenges in achieving high positional accuracy due to the use of rubber bushings, which hinder precise attachment to the case.
Innovation Solution
The design incorporates a telegraph connector portion with a second positioning portion and a first positioning portion, including a knock portion and a fitting portion with a sealing member, allowing for precise alignment and attachment to the case, improving mounting accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the resolver stator is attached to a bracket including a bearing and the bracket is fixed to a case via a rubber bush, then the mounting structure is simple and flexible, but the mounting position accuracy deteriorates
Solution Approach 1:
The mounting structure is divided into separate positioning portions: a first positioning portion with a knock portion for radial positioning and a second positioning portion with a fitting portion for axial positioning. This segmentation allows each portion to independently provide precise positioning in its specific direction, achieving high mounting position accuracy while maintaining structural simplicity
Solution Approach 2:
The knock portion and fitting portion act as intermediary positioning elements between the resolver stator and the case. These intermediaries provide precise geometric references that eliminate the need for flexible but imprecise rubber bushings, while still allowing for easy assembly through standardized fitting mechanisms
2Ease of operation
If traditional mounting methods are used, then the assembly process is simple, but the gap for dimensional tolerance absorption increases
Solution Approach 1:
The invention changes the positioning parameters from flexible rubber bush mounting to rigid geometric positioning using knock and fitting portions. This parameter change reduces dimensional tolerance gaps by providing fixed reference surfaces, while the modular design maintains assembly simplicity through straightforward insertion and fixation operations
3Ease of manufacture
If the resolver stator is mounted with conventional positioning, then the mounting process is straightforward, but the sealing performance deteriorates due to increased crushing margin
Solution Approach 1:
The invention adds a second positioning dimension with the fitting portion that extends in the axial direction, complementing the radial knock portion. This dimensional addition precisely locates the sealing member position, reducing the crushing margin and improving sealing performance while keeping the mounting process straightforward through multi-directional positioning
Data Source
AI summary
A rotating electrical machine unit includes: a rotating electrical machine; a resolver which includes a resolver rotor and a resolver stator; and a case which accommodates the rotating electrical machine and the resolver. The resolver stator includes: a stator portion; a telegraph connector portion; and a first positioning portion including a knock portion protruding to one side. The telegraph connector portion includes a second positioning portion having a fitting portion having a sealing member on an outer peripheral surface. The resolver stator is attached to the case by being positioned with the knock portion of the first positioning portion being fixed to a knock fixing portion of the case and the fitting portion of the second positioning portion being fitted into a mounting hole of the case.