Motor Fire Prevention via External Incombustible Cover
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Solution Overview
Problem
Existing motors face the risk of fire and smoke leakage due to overheating and insulation failure, which can spread outside the motor, and changing the position of attaching legs to install safety covers is difficult, limiting the ability to increase stator core diameter and maintain safety.
Innovation Solution
A motor design featuring incombustible material covers on the outer peripheral surface of the mold resin to surround coil ends, with circumferential grooves and positioners to avoid interference with attaching legs, allowing the stator core to be enlarged without changing its position, and incorporating positioners to secure the cover's stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal cover is installed inside mold resin to prevent fire leakage, then safety is improved, but it interferes with attaching leg position and prevents stator core enlargement
Solution Approach 1:
The patent moves the incombustible material cover from the internal radial dimension (inside mold resin) to the external axial dimension (outside mold resin). This dimensional relocation allows the cover to perform its fire prevention function while eliminating interference with attaching legs and enabling stator core enlargement, as the cover now sits externally without constraining internal components.
Solution Approach 2:
The patent segments the fire prevention function from the stator core assembly by making the incombustible material cover a separate, removable component rather than an integrated part of the mold resin. This segmentation allows the cover to be independently positioned and adjusted without affecting the stator core or attaching legs, resolving the conflict between safety requirements and design flexibility.
2Adaptability or versatility
If incombustible material cover is placed outside mold resin, then stator core can be enlarged, but cover stability and positioning become problematic
Solution Approach 1:
The patent introduces positioners as intermediary components that mediate between the incombustible material cover and the motor housing. These positioners provide precise positioning and stable mounting for the externally located cover, ensuring it remains securely in place while allowing the stator core to be enlarged without compromising cover stability.
3Reliability
If safety protection circuit is provided inside motor, then fire risk is reduced, but it increases device complexity and does not completely prevent fire leakage
Solution Approach 1:
The patent applies preliminary anti-action by providing physical containment through the incombustible material cover that prevents fire leakage before it can escape the motor. This passive protective barrier works in conjunction with the safety protection circuit, creating a layered defense system that addresses fire safety through both active electrical protection and passive physical containment, thereby reducing overall system complexity while maintaining high safety standards.
Data Source
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AI summary
The present disclosure relates to a motor including: a stator having a stator core and a coil; a rotor rotatably located inside the stator; and a mold resin covering the stator, wherein the coil has coil ends protruding from the stator core to both sides in the axial direction, a first incombustible material cover is mounted on an outer peripheral surface of the mold resin to surround one of coil ends over a circumferential direction, a plurality of attaching legs are provided along the circumferential direction on the outer peripheral surface of the mold resin, a root portion of each of the plurality of attaching legs, the root portion being connected to the outer peripheral surface of the mold resin, is formed with a circumferential groove extending along the circumferential direction and opened to both sides in the circumferential direction and one side in the axial direction, and a distal end of the first incombustible material cover on the one side in the axial direction enters the circumferential groove of each of the plurality of attaching legs. According to the motor of the present disclosure, fire and smoke can be prevented from coming outside from the motor without changing the positions of the attaching legs.