Rotary Machine Coil-End Airflow Guide for Uniform Gas Cooling
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Solution Overview
Problem
The coil end of a rotary electrical machine is not sufficiently cooled due to insufficient coverage by cooling air, particularly the inner peripheral side near the air gap, leading to inadequate heat dissipation.
Innovation Solution
A cooling air control member is provided between the coil end and the housing, guiding cooling gas from the introduction port to flow through a defined path from the outer to the inner peripheral side of the coil end, ensuring uniform cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling air is introduced from an introduction port near the coil end, then the cooling air can reach the coil end, but the inner peripheral side of the coil end near the air gap is not sufficiently cooled
Solution Approach 1:
A guide plate is introduced as an intermediary component between the introduction port and the coil end. The guide plate has a through-hole that directs cooling air from the introduction port to the flow path, ensuring the air reaches the inner peripheral side of the coil end that would otherwise be difficult to access. This mediator structure resolves the contradiction by enabling effective cooling of previously unreachable areas without requiring complex redesign of the overall cooling system.
Solution Approach 2:
The guide plate extends in the axial direction of the coil end, creating a new dimensional pathway for cooling air. By positioning the guide plate's through-hole to align with both the introduction port and the flow path, the design utilizes the axial dimension to guide air flow into the coil end's internal flow path, thereby reaching the inner peripheral side effectively.
2Ease of operation
If a guide plate is provided near the introduction port, then cooling air can be directed toward the coil end, but the inner peripheral side near the air gap remains insufficiently cooled
Solution Approach 1:
The guide plate acts as a mediator that bridges the introduction port and the flow path. Its through-hole is strategically positioned to channel cooling air directly into the flow path, ensuring comprehensive coverage including the inner peripheral side. This intermediary structure maintains ease of operation while achieving complete cooling coverage.
Solution Approach 2:
The guide plate is pre-positioned in the axial direction to establish the cooling air flow path before the air is introduced. This preliminary arrangement ensures that when cooling air enters through the introduction port, it is immediately directed through the guide plate's through-hole into the flow path, guaranteeing that all areas including the inner peripheral side are covered from the start.
3Productivity
If cooling air flows from outer peripheral side to inner peripheral side, then the flow path is utilized, but the inner peripheral side near the air gap is not sufficiently hit by cooling air
Solution Approach 1:
The guide plate serves as a mediator that enhances the existing cooling air flow from the outer peripheral side to the inner peripheral side. By introducing the guide plate's through-hole into this flow path, it amplifies and redirects the cooling air to ensure sufficient coverage of the inner peripheral side near the air gap, thereby improving both cooling efficiency and uniformity.
Solution Approach 2:
The guide plate's through-hole is specifically positioned to target the inner peripheral side of the coil end, which is the area with insufficient cooling. This localized intervention enhances the cooling quality in the specific region that needs it most, while maintaining the overall cooling efficiency of the system.
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
The cooling air control member effectively directs cooling gas to pass through the coil end, ensuring appropriate cooling and heat dissipation across the entire coil end.
Implementation Method 1
a flow path is provided in the coil end through which gas introduced from the introduction port flows from the outer periphery toward the inner periphery
Implementation Method 2
the coil end of a rotary electrical machine is not sufficiently cooled due to insufficient coverage by cooling air
Implementation Method 3
the coil end generates heat when a current flows, appropriate cooling is required
Data Source
AI summary
A rotary electrical machine in which a rotor and a stator are housed in a housing and a coil of the stator is cooled using gas. The stator includes an annular coil end protruding from an end portion of the stator in an axial direction thereof. The housing includes an introduction port configured to allow gas for cooling the rotary electrical machine to be introduced from an outside of the housing toward the coil end. The coil end includes a flow path configured to allow the gas introduced from the introduction port to pass from an outer peripheral side to an inner peripheral side. A cooling air control member configured to guide the gas introduced from the introduction port to the flow path of the coil end is provided between the coil end and the housing in the axial direction.