Rotating Electrical Machine Housing with Sealed Cooling Flow Passage
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Solution Overview
Problem
Conventional rotating electrical machines with cooling liquid flow passages face challenges in securing airtightness and productivity due to the need for complex sealing structures and increased component counts.
Innovation Solution
A rotating electrical machine design featuring a housing with an annular groove for the cooling liquid flow passage, where a plate covers the open surface, and is secured using welding or adhesive materials to ensure airtightness without relying on packing or bolts, reducing the number of components and improving manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealing structure using packing and bolt fastening is used to secure airtightness of the flow passage, then airtightness is improved, but the number of components and production processes increase
Solution Approach 1:
The patent merges the sealing function with the housing structure itself by forming the flow passage directly in the housing body through die-casting. The housing integrates the cooling liquid flow passage as an internal cavity, eliminating the need for separate sealing components like packing and bolts. This consolidation maintains airtightness while reducing component count and assembly complexity.
Solution Approach 2:
The patent replaces the mechanical sealing system (packing and bolt fastening) with a monolithic housing structure where the flow passage is formed as an integrated cavity. This substitution eliminates mechanical sealing components and their associated assembly operations, achieving airtightness through the inherent structural integrity of the die-cast housing.
2Reliability
If a sealing structure using packing and bolt fastening is used to secure airtightness of the flow passage, then airtightness is improved, but productivity decreases
Solution Approach 1:
The patent combines the flow passage formation with the housing manufacturing process itself. The die-casting process creates the housing with an integrated internal cavity for cooling liquid flow, eliminating the need for separate sealing component assembly steps. This integration streamlines production and improves productivity while maintaining airtightness.
Solution Approach 2:
The patent replaces the multi-step mechanical sealing assembly process with a single die-casting operation that forms the housing with an integrated flow passage cavity. This substitution eliminates multiple assembly operations (installing packing, tightening bolts) and improves manufacturing efficiency and productivity.
3Ease of manufacture
If low pressure casting with premolded core is used to form the flow passage in the housing, then the flow passage can be formed, but manufacturing cost increases and productivity decreases
Solution Approach 1:
The patent replaces the low pressure casting process with die-casting technology. The die-casting process forms the housing with an integrated flow passage cavity in a single operation, eliminating the need for premolded cores and subsequent core removal steps. This substitution significantly improves productivity and reduces manufacturing cost while maintaining the ability to form complex flow passages.
Solution Approach 2:
The patent merges the flow passage formation with the housing manufacturing by using die-casting to create both the housing structure and the internal flow passage cavity in one integrated process. This eliminates the separate core-making and core-removal operations required in low pressure casting, improving productivity and reducing manufacturing complexity.
4Ease of manufacture
If low pressure casting with premolded core is used to form the flow passage in the housing, then the flow passage can be formed, but manufacturing cost increases
Solution Approach 1:
The patent replaces the low pressure casting process with die-casting, which forms the housing with an integrated flow passage cavity more efficiently. The die-casting process eliminates the need for expensive premolded cores and their subsequent removal, reducing material waste and manufacturing cost while maintaining the capability to form complex flow passages.
Solution Approach 2:
The patent combines the flow passage formation with the housing manufacturing through die-casting, eliminating the need for separate core materials and their removal processes. This integration reduces material consumption and manufacturing cost while maintaining ease of flow passage formation.
Data Source
AI summary
Provided is a rotating electrical machine including a housing in which a flow passage of cooling liquid can be easily formed and airtightness and productivity are high. A rotating electrical machine is configured to include a housing which is provided with a part of a flow passage of cooling liquid, a stator which is disposed on an inner circumferential side of the housing and includes a stator winding, and a rotor which is rotatably supported to an inner circumferential side of the stator with a gap between the stator and the rotor and the flow passage of the cooling liquid includes an annular groove having an open surface on at least one side of an axial direction of the housing and a plate provided to cover the open surface. Preferably, the housing and the plate are configured to be joined by welding or an adhesive material. In addition, roughening processing or chemical processing may be performed on parts of the housing and the plate and the housing and the plate may be configured to be joined by a resin.