Integrated Electric Pump Cooling Layout for Rotor-Stator Heat Control
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Solution Overview
Problem
Existing electric machines in vehicles face inefficiencies due to viscous friction losses and sealing requirements when the rotor and stator are not in direct contact with oil, affecting cooling efficiency and maximum operating power.
Innovation Solution
An integrated electric pump system with a rotor shaft cooling oil circuit, machine housing cooling oil circuit, spray nozzles, and an oil discharge pump to directly cool the stator and rotor, ensuring efficient heat exchange and air gap maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the rotor and stator are not immersed in oil for cooling, then efficiency is improved and sealing requirements are lowered, but cooling effect is insufficient and maximum operating power is affected
Solution Approach 1:
The cooling system is segmented into two independent circuits: a first cooling oil circuit within the rotor shaft and a second cooling oil circuit within the machine housing. This segmentation allows the rotor and stator to be cooled separately without requiring full immersion in oil, thereby reducing viscous friction losses while maintaining effective cooling.
Solution Approach 2:
Cooling oil acts as an intermediary substance that transfers heat from the rotor and stator to the surrounding environment. The oil circulates through dedicated cooling channels in the rotor shaft and machine housing, enabling heat removal without direct oil immersion of the rotating components.
2Device complexity
If cooling channels are provided in rotor shaft and machine housing, then rotor and stator can be cooled separately, but oil cannot directly contact rotor and stator, reducing cooling efficiency
Solution Approach 1:
The cooling oil circuits are nested within the existing structural components - the first cooling oil circuit is integrated into the rotor shaft, and the second cooling oil circuit is integrated into the machine housing. This nesting approach enables effective cooling without adding external cooling apparatus, maintaining structural compactness while improving cooling efficiency.
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
Enhances cooling efficiency, reduces power loss, and maintains sealing requirements, thereby improving the operating power and performance of the electric machine.
Implementation Method 1
the rotor shaft is provided with a first cooling oil circuit, the machine housing is provided with a second cooling oil circuit
Implementation Method 2
The multiple spray nozzles are fixed to the machine housing, where the multiple spray nozzles are connected to the second cooling oil circuit and are used for spraying cooling oil to the stator
Implementation Method 3
The oil discharge pump is used for discharging the cooling oil in the inner cavity out of the inner cavity
Data Source
AI summary
An integrated electric pump includes an electric machine, a pump, multiple spray nozzles, and an oil discharge pump. The electric machine and the pump are integrated. The electric machine includes a machine housing, a stator, a rotor, and a rotor shaft. The stator is fixedly disposed in the machine housing. The rotor shaft is rotatably disposed in the machine housing. The rotor is fixedly disposed on the rotor shaft. The stator is sleeved on the rotor with a gap between the stator and the rotor. The rotor shaft is provided with a first cooling oil circuit. The machine housing is provided with a second cooling oil circuit. The rotor shaft is drivingly connected to the pump. The spray nozzles are connected to the second cooling oil circuit