Stator Protective Wall for Rotating Electric Machine Noise Reduction
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Solution Overview
Problem
The existing stator design for rotating electric machines suffers from increased fan noise due to non-uniform radial distances of bridging wires, which cause pressure variations, and exposure to foreign matter from cooling air, leading to reduced environmental resistance.
Innovation Solution
Incorporating a protective wall, formed from bridging wires, radially inside the connection portions of the stator coil to shield them from cooling air and foreign matter, thereby reducing fan noise and enhancing environmental resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bridging wires are arranged to avoid interfering with connection portions, then the connection portions and bridging wires can be electrically connected, but the radial distances from the center of rotation become non-uniform causing pressure variation and increased fan noise
Solution Approach 1:
A protective wall is introduced as an intermediary structure between the cooling fan and the connection portions/bridging wires. This wall shields the electrical components from direct exposure to cooling air flow, preventing the pressure variations that cause fan noise while maintaining electrical connection functionality
Solution Approach 2:
The protective wall, which initially seems to obstruct cooling air flow, actually converts the harmful direct exposure into a beneficial shielding effect. By blocking the direct path of cooling air to the connection portions, it eliminates the pressure-induced vibrations and fan noise while still allowing adequate cooling through alternative paths
2Temperature
If connection portions are directly exposed to cooling air flow, then cooling efficiency is improved, but foreign matter such as dust and electrolytic solution can damage the connection portions reducing environmental resistance
Solution Approach 1:
The protective wall serves as a mediator that separates the cooling function from the protection function. It allows cooling air to reach the stator coil windings while blocking the path of foreign matter to the connection portions, thus maintaining cooling efficiency without exposing electrical components to contaminants
Solution Approach 2:
Different regions of the stator assembly are given different levels of exposure to cooling air. The stator coil windings are exposed for effective cooling, while the connection portions are shielded to protect them from foreign matter. This localized differentiation of exposure quality optimizes both cooling and protection
Data Source
AI summary
A stator includes an annular stator core, a stator coil and at least one protective wall. The stator core has a plurality of slots formed therein. The slots are spaced from one another in a circumferential direction of the stator core. The stator coil is comprised of a plurality of windings mounted on the stator core. The windings are connected in a predetermined manner to form a plurality of connection portions therebetween. The connection portions are located outside the slots of the stator core on one axial side of the stator core. The at least one protective wall is provided radially inside the connection portions of the stator coil so as to shield the connection portions from the radially inside of the stator.