Cooling structure for rotary electric machine
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Solution Overview
Problem
Rotary electric machines in electric vehicles face challenges in maintaining stable refrigerant supply and cooling performance, particularly under high loads, due to variations in refrigerant flow rate and pressure, leading to inadequate cooling efficiency.
Innovation Solution
A cooling structure incorporating dual supply pipes and pumps, where a mechanical oil pump and an electric oil pump deliver refrigerant to the pipes in opposite directions, allowing independent control of flow rate and pressure to optimize refrigerant discharge and enhance cooling performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single supply pipe is used to deliver refrigerant to the rotary electric machine, then the device complexity is reduced, but the refrigerant supply stability deteriorates under high load conditions
Solution Approach 1:
The single supply pipe is segmented into two parallel supply pipes (first supply pipe and second supply pipe), each capable of independently delivering refrigerant to the rotary electric machine. This segmentation allows the system to maintain refrigerant supply stability under high load conditions while managing device complexity through modular architecture.
2Temperature
If refrigerant flow rate and pressure are increased to improve cooling performance under high load, then cooling performance is improved, but refrigerant supply stability deteriorates due to variations in flow rate and pressure
Solution Approach 1:
The system changes the parameters of refrigerant delivery by using two parallel supply pipes with opposite flow directions. This allows independent control of flow rate and pressure for each pipe, enabling the system to maintain stable refrigerant supply while achieving improved cooling performance under high load conditions.
3Temperature
If the discharge range of refrigerant is expanded to improve cooling performance, then cooling performance is improved, but the precision of refrigerant delivery control is reduced
Solution Approach 1:
The refrigerant delivery system is segmented into two independently controllable supply pipes. This segmentation enables precise control of refrigerant delivery parameters (flow rate, pressure, direction) for each pipe, allowing the system to expand the discharge range for improved cooling performance while maintaining precise delivery control through independent regulation of each pipe.
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 configuration improves refrigerant supply stability and cooling performance by adjusting the discharge range and direction of refrigerant, ensuring optimal cooling even under high loads, thereby enhancing the power performance of hybrid vehicles.
Implementation Method 1
The pump is configured to deliver the refrigerant to the first supply pipe and the second supply pipe such that a direction of the refrigerant flowing through the first supply pipe and a direction of the refrigerant flowing through the second supply pipe are opposite to each other
Implementation Method 2
lubricating oil included in the transaxle or the like or a hydraulic fluid for device control is supplied to the rotary electric machine to cool the rotary electric machine
Data Source
AI summary
A cooling structure for a rotary electric machine includes a first supply pipe that is disposed vertically above a rotary electric machine and that has a discharge hole through which a refrigerant is discharged toward the rotary electric machine; a second supply pipe that is disposed in parallel with the first supply pipe vertically above the rotary electric machine and that has a discharge hole through which the refrigerant is discharged toward the rotary electric machine; and a pump configured to deliver the refrigerant to the first supply pipe and the second supply pipe such that a direction of the refrigerant flowing through the first supply pipe and a direction of the refrigerant flowing through the second supply pipe are opposite to each other.