Vehicle Motor Stator Core Inclination Restraining Structure
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Solution Overview
Problem
Existing vehicle electric motors face challenges in restraining the inclination of the stator core, which can lead to excessive displacement and potential contact with the rotor, especially when supported in a cantilever manner.
Innovation Solution
A vehicle electric motor design that includes a stator-core-inclination restraining portion protruding from the housing's circumferential wall towards the stator core, combined with a positioning engagement mechanism and screw bolts for secure fixation, limits the stator core's displacement and prevents excessive inclination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the stator core is supported in a cantilever manner by the casing, then the structure is simplified and easier to manufacture, but the inclination of the stator core becomes relatively large which may cause contact with the rotor
Solution Approach 1:
The housing is divided into a casing and a cover, with the stator core supported by the casing and the cover providing inclination restraint. This segmentation allows the support function and the restraint function to be separated into different components, maintaining manufacturing simplicity while improving reliability through the cover's restraining portion
Solution Approach 2:
The cover acts as an intermediary component between the stator core and the external environment. It provides the restraining portion that limits stator core inclination without interfering with the simplified cantilever support structure, thus maintaining ease of manufacture while preventing harmful contact with the rotor
2Reliability
If the casing is designed with a large inside-diameter portion to prevent stator core contact, then the risk of contact is reduced, but the housing size increases and manufacturing complexity increases
Solution Approach 1:
Instead of enlarging the entire housing, the restraining portion is added locally to the cover where it is needed for inclination restraint. This localized approach provides the necessary reliability without increasing overall housing size or manufacturing complexity
Solution Approach 2:
Rather than modifying the casing to prevent contact through enlargement, the invention inverts the approach by adding a restraining portion to the cover that actively limits stator core inclination. This reverse approach achieves contact prevention without increasing housing dimensions or complexity
3Stability of the object's composition
If the stator core is fixed rigidly at one end to the housing, then the stator core position is stable, but the housing structure becomes more complex requiring additional fastening components
Solution Approach 1:
The casing serves multiple functions: it provides the cantilever support for the stator core and simultaneously houses the fastening components for rigid fixation. This multi-functionality achieves stable stator core positioning without adding separate housing structures, maintaining structural simplicity
Data Source
AI summary
A vehicle electric motor including: a tubular-shaped stator core constituted by electromagnetic steel sheets that are laminated on each other; a rotor disposed inside the stator core so as to be rotated about an axis; and a housing storing therein the tubular-shaped stator core and the rotor, and including a circumferential wall and axially opposite end walls that are opposed to each other in a direction parallel with the axis. The stator core is fixed at one of its axially end portions to one of the axially opposite end walls of the housing. The housing includes a stator-core-inclination restraining portion that protrudes from an inner circumferential surface of the circumferential wall of the housing toward a part of an outer circumferential surface of the stator core, wherein the part is located on a side of the other of the axially end portions of the stator core.