Electronic Fluid Pump Housing Frame for EMC and Coaxial Alignment
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Solution Overview
Problem
Existing automotive electronic fluid pumps face challenges in achieving high electromagnetic efficiency and compatibility due to the lack of effective electromagnetic shielding and precise coaxiality between motor components, leading to inefficiencies and increased weight and cost.
Innovation Solution
An automotive electronic fluid pump design featuring a metal motor housing frame with a deep-drawn structure that provides electromagnetic shielding and precise coaxiality, using a non-ferromagnetic separation tube to separate wet and dry chambers, and a pot-like housing frame that supports the stator and separation tube, ensuring efficient heat dissipation and reduced weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a metal pump housing is used to provide electromagnetic shielding, then electromagnetic compatibility is improved, but weight and cost increase
Solution Approach 1:
The pump housing is divided into two functional parts: a plastic pump housing body that defines the fluid passages and a separate metal housing frame that provides electromagnetic shielding. This segmentation allows each part to perform its optimal function without the penalties of a fully metal construction, resolving the contradiction between EMC and weight.
Solution Approach 2:
A non-ferromagnetic separation tube made of plastic is introduced as an intermediary component between the wet rotor chamber and the dry stator chamber. This separation tube allows the metal housing frame to provide electromagnetic shielding while the plastic components maintain light weight and fluid pumping functions.
2Object-affected harmful factors
If a metal pump housing is used to provide electromagnetic shielding, then electromagnetic compatibility is improved, but manufacturing cost increases
Solution Approach 1:
The housing is segmented into plastic and metal parts that can be manufactured separately using optimized processes for each material, then assembled together. This reduces the cost penalties associated with fully metal construction while maintaining electromagnetic shielding effectiveness.
Solution Approach 2:
The metal housing frame serves multiple functions: providing electromagnetic shielding, supporting the stator and separation tube, and forming part of the overall housing structure. This multi-functionality reduces the need for additional components and reduces overall manufacturing cost.
3Manufacturing precision
If deep-drawn metal sheet body is used for motor housing frame, then manufacturing precision and coaxiality are improved, but manufacturing complexity increases
Solution Approach 1:
Multiple housing components (motor housing, stator support, separation tube support) are merged into a single deep-drawn metal housing frame structure. This integration ensures precise coaxiality of all motor components while reducing the number of separate parts and assembly steps.
Solution Approach 2:
The deep-drawn metal housing frame utilizes axisymmetric curved surfaces and rotational symmetry in its geometry, which naturally provides precise coaxial alignment of motor components and simplifies the manufacturing process through single-point forming techniques.
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 achieves high electromagnetic compatibility and efficiency while maintaining a competitive weight and cost, with efficient heat dissipation and precise component alignment.
Implementation Method 1
an electric pump motor (14) comprising an electronic motor stator (50) with several stator coils (52) and a rotor (32) comprising a motor rotor (54), a pump rotor (34) and a rotor shaft (30) mechanically and co-rotatably connecting the motor rotor and the pump rotor
Implementation Method 2
the motor housing frame is made of a deep-drawn metal sheet body... the motor housing frame is sufficiently solid and stiff to precisely support and coaxiality position the motor stator and the separation tube
Implementation Method 3
The motor housing frame is made of a deep-drawn metal sheet body... Preferably, the motor housing frame is made of a ferromagnetic metal material to provide a good electromagnetic shielding of the motor stator resulting in a good electromagnetic compatibility EMC of the fluid pump
Data Source
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AI summary
The invention is directed to an automotive electronic fluid pump (10) with an electric pump motor (14). The electric pump motor (14) comprises an electromagnetic motor stator (50) with several stator coils (52), a rotor comprising a motor rotor (54) electromag netically driven by the motor stator (50), a pump rotor (34) and a rotor shaft (30), a motor electronics (42) being arranged within an electronics chamber (40) and comprising a commutation electronics and power semiconductors (44) for energizing the stator coils (52), and a separation tube (70) fluidically separating a wet motor rotor chamber (62) from a dry motor stator chamber (61). A pot-like motor housing frame (80) is provided with a frame bottom wall (82) and a substantially cylindrical frame side wall (84). The frame bottom wall (82) defines a substantially transversal separation wall (64) for fluidically separating the wet motor rotor chamber (62) from the dry electronics chamber (40). The frame side wall (84) supports the radial outside of the motor stator (50). The motor housing frame (80) is made of a deep-drawn metal sheet body (80')· The motor housing frame (80) also defines a cylindrical axial support collar (66) made by reverse-drawing of the metal sheet body (80'). The support collar (66) directly supports a support section (702) of the separation tube (70).