Nested Motor-Pump Layout With Radial Fluid Cooling
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Solution Overview
Problem
Existing electric and hydraulic machines lack an efficient integration of motor and pump components, leading to suboptimal fluid displacement and cooling mechanisms, which affects the overall performance and efficiency of the system.
Innovation Solution
The integration of a motor and pump within a shared housing, where the pump is nested radially within the motor, with a dual-flow route system that allows fluid to be displaced from a low-pressure chamber to a high-pressure chamber while also utilizing radial cooling channels to cool the motor, enhancing both fluid displacement and motor cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pump is nested radially within the motor in a shared housing, then the integration efficiency and space utilization are improved, but the complexity of fluid flow routing and cooling channel design increases
Solution Approach 1:
The pump is nested radially within the motor, with the pump chamber positioned inside the motor chamber. The pump housing is received within the motor housing, creating a compact integrated assembly where the pump elements (inner gear and outer gear) are surrounded by the motor components (rotor and stator), maximizing space utilization while maintaining functional independence of both subsystems
Solution Approach 2:
The working fluid serves multiple functions simultaneously: it is displaced by the pump from low-pressure to high-pressure chambers, and the same fluid flows through radial cooling channels to cool the motor. This multi-functional use of the fluid eliminates the need for separate cooling systems, reducing overall system complexity despite the nested configuration
2Productivity
If a dual-flow route system is implemented for fluid displacement and motor cooling, then the overall system performance is improved, but the manufacturing complexity increases
Solution Approach 1:
The fluid flow system is segmented into distinct pathways: a first flow route for fluid displacement (from low-pressure chamber through pump elements to high-pressure chamber) and a second flow route for cooling (from low-pressure chamber through radial cooling channels to motor chamber). This segmentation allows independent optimization of each flow path while maintaining a unified integrated design
Solution Approach 2:
The pump chamber and motor chamber share a common housing structure with interconnected flow paths. The radial cooling channels extend from the pump chamber through the motor chamber, merging the fluid displacement and cooling functions into a single integrated system that shares common structural and fluidic infrastructure, reducing the number of separate components
3Volume of moving object
If the pump chamber is positioned radially inward of the motor chamber, then the compactness and space efficiency are improved, but the difficulty of assembly and maintenance increases
Solution Approach 1:
The pump is nested within the motor with the pump chamber radially inward of the motor chamber. The pump housing is received within the motor housing, creating a compact nested arrangement that maximizes space efficiency while maintaining functional independence of both subsystems
Solution Approach 2:
The pump elements (inner gear and outer gear) can be extracted from the pump chamber for maintenance or replacement. The pump chamber is designed to allow removal of the pump elements while the pump housing remains within the motor housing, enabling maintenance of the pump components without requiring complete disassembly of the integrated assembly
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 the efficiency of fluid displacement and motor cooling, leading to enhanced performance and reliability of the electric and hydraulic machine by ensuring effective fluid circulation and temperature management.
Implementation Method 1
cooling the motor with the working fluid by directing a first portion of the working fluid from the low-pressure chamber through a radial cooling channel to the motor chamber
Implementation Method 2
fluid in the pump chamber communicates with the rotor and the stator to cool the motor
Data Source
AI summary
An electric and hydraulic machine includes a housing defining a motor chamber and a pump chamber, a motor comprising a rotor and a stator positioned within the motor chamber, and a pump comprising a pumping element positioned within the pump chamber, the pumping element movable by the motor to displace fluid in the pump chamber. The pump chamber includes a low-pressure chamber and a high-pressure chamber, a unit inlet defined by the housing and in communication with the low-pressure chamber, and a unit outlet defined by the housing and in communication with the high-pressure chamber. The pump chamber is positioned radially inward of the motor chamber such that the pump is nested within the motor. A radial cooling channel extends in a radial direction from the low-pressure chamber to the motor chamber such that fluid in the pump chamber communicates with the rotor and the stator to cool the motor.