Cooling Structure for Rotating Electric Machine with Edgewise Coil
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The cooling performance of rotating electric machines with edgewise coils formed of rectangular wires is inadequate due to gaps between the wire and the stator iron core, which hinder heat transfer, leading to insufficient cooling.
Innovation Solution
A cooling structure that supplies a cooling medium through the gaps between the insulating member and the rectangular wire, allowing direct cooling of the iron core, with options for medium flow between coils and the use of a pump to enhance heat exchange efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a rectangular wire is used to form an edgewise coil, then the coil cross-sectional area increases and direct-current resistance decreases, but gaps are formed between the wire and the iron core due to the great radius of curvature at turns
Solution Approach 1:
A cooling medium is introduced as an intermediary substance that flows through the gaps between the rectangular wire and the iron core. This cooling medium serves dual purposes: it fills the manufacturing gaps that would otherwise insulate thermally, and it provides direct cooling to the wire. The cooling medium acts as a mediator that transforms the harmful gaps into useful cooling channels.
Solution Approach 2:
The invention changes the thermal parameter of the gap by introducing a cooling medium with high thermal conductivity. Instead of the gap being a thermal insulator (air or vacuum), it becomes a thermal conductor through the circulating cooling medium. This parameter change converts the gap from a harmful feature into a beneficial cooling pathway.
2Shape
If gaps are formed between the wire and the iron core, then the wire can be wound with appropriate curvature radius, but heat transfer from the wire to the iron core is hindered
Solution Approach 1:
The cooling medium serves as a thermal intermediary that bridges the gap between the wire and the iron core. Instead of relying on direct solid-to-solid heat transfer through the gap (which is inefficient), the cooling medium absorbs heat from the wire and transfers it to the iron core, enabling effective heat transfer despite the geometric gap.
Solution Approach 2:
The invention employs hydraulic cooling by circulating a liquid cooling medium through the gaps. The fluid dynamics of the cooling medium enable continuous heat removal from the wire, with the fluid absorbing thermal energy as it flows through the gap regions and carrying it away to be dissipated externally.
3Temperature
If thermal conductive material is supplied through channels in the insulating member, then heat transfer from wire to iron core is improved, but the cooling structure becomes complex requiring coolant supply systems and pumps
Solution Approach 1:
The cooling medium performs multiple functions simultaneously: it provides thermal conduction across the gaps, acts as a cooling agent for the wire, and serves as a heat transport medium to the iron core. This multi-functionality eliminates the need for separate thermal conductive materials and complex coolant supply systems, as the single cooling medium handles all thermal management tasks.
Solution Approach 2:
The cooling medium flows through the gaps naturally or with minimal pumping, automatically filling the spaces and providing cooling where needed. The system self-regulates the cooling distribution according to the heat generation patterns, with the cooling medium naturally seeking out the hottest regions (the wire gaps) and providing cooling there, reducing the need for complex control systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach provides efficient cooling of rotating electric machines by utilizing the gaps as channels for the cooling medium, promoting direct heat transfer and improving thermal management, thus enhancing the performance and durability of the machine.
Implementation Method 1
supply means for supplying a cooling medium to flow through the gap
Implementation Method 2
a cooling medium to flow through the gap
Implementation Method 3
the wire of a coil generates heat to raise the temperature
Data Source
AI summary
A rotating electric machine including an edgewise coil formed of a rectangular wire is efficiently cooled. The edgewise coil is formed by winding the rectangular wire around a tooth. In order to wind the rectangular wire around the tooth of rectangular shape, supporting portions determining the position of the edgewise coil relative to the tooth are provided. A coolant flows through a cooling water channel provided between the tooth and the edgewise coil formed of the rectangular wire and positioned by the supporting portions.