Automotive Electric Liquid Pump Wet Rotor Cavity Design
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Solution Overview
Problem
Automotive electric liquid pumps with electric motors face inefficiencies due to frictional losses from shaft sealing and the high cost of ferromagnetic materials used in the motor rotor, which affects the fluid-tight construction and overall efficiency.
Innovation Solution
An automotive electric liquid pump design featuring a wet motor rotor with a cylindrical, permanently magnetized rotor body surrounding a ring-like motor rotor cavity, where a cover disk closes the cavity to minimize liquid flow and friction, and the motor rotor can be filled with a solid plastic cavity filling to reduce weight and stress, allowing for optimized material selection for each component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a canned motor concept with ferromagnetic materials is used to provide fluid-tight construction, then sealing reliability is improved, but material cost increases
Solution Approach 1:
The patent applies local quality by using ferromagnetic materials only in the rotor body section that requires fluid-tight construction and magnetic properties, while other parts can use different materials. This localized application of expensive materials reduces overall cost while maintaining necessary reliability in critical areas.
Solution Approach 2:
The patent employs composite materials by combining ferromagnetic materials with other materials in the rotor structure. The rotor body section uses ferromagnetic material for fluid-tight construction, while other components may use different materials optimized for their specific functions, reducing overall material cost while maintaining performance.
2Reliability
If the motor rotor is filled with pumping liquid, then fluid-tight construction is achieved, but frictional losses increase reducing efficiency
Solution Approach 1:
The patent segments the rotor into two distinct parts: a rotor body section that is fluid-tight and contains the motor rotor cavity, and a motor rotor cavity that can be filled with air or other non-friction-causing material. This segmentation allows the fluid-tight construction to be maintained in the body section while eliminating frictional losses in the cavity by filling it with air instead of pumping liquid.
Solution Approach 2:
The patent introduces air as an intermediary substance in the motor rotor cavity. This air filling acts as a mediator that eliminates direct contact between pumping liquid and the rotating rotor components, thereby reducing frictional losses while the fluid-tight rotor body section maintains the necessary sealing function.
3Power
If ferromagnetic materials are extensively used in the motor rotor, then magnetic performance is improved, but material cost increases
Solution Approach 1:
The patent applies local quality by restricting ferromagnetic materials to only the rotor body section where they are necessary for fluid-tight construction and basic magnetic function, while the motor rotor cavity is filled with air or other non-ferromagnetic material. This localized use of ferromagnetic materials maintains necessary magnetic performance while significantly reducing material cost.
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 design enhances efficiency by reducing frictional losses and minimizing the use of expensive magnet material, while allowing for cost-effective production and material optimization, resulting in a more efficient and lightweight liquid pump.
Implementation Method 1
the motor rotor is permanently magnetized and is arranged within the pumping liquid
Implementation Method 2
the cylindrical rotor body section is configured to be permanently magnetized
Data Source
AI summary
An automotive electric liquid pump includes a pump wheel, an EC-motor which directly drives the pump wheel, and a cover disk. The EC-motor comprises a wet motor rotor. The wet motor rotor comprises a ring-like motor rotor cavity, and a motor rotor body comprising a cylindrical rotor body section. The cylindrical rotor body section is permanently magnetized and surrounds a motor rotor cavity which is ring-like. The cover disk is arranged at a longitudinal rotor end opposite to the pump wheel. The cover disk closes the motor rotor cavity.