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Original Technical Problem
How To Optimize Materials and Packaging for E-Corner Modules
Technical Problem Background
The challenge involves optimizing both materials selection and packaging architecture for integrated e-corner modules—compact electric drive units that combine motor, inverter, gearbox, and suspension interfaces at each wheel. The solution must address conflicting demands: higher power density requires more active materials, yet space and weight are severely constrained by vehicle dynamics and packaging. Key subsystems include the electric motor (copper windings, laminations), power electronics (SiC modules), gearbox (gears, bearings), and thermal management (coolant paths). Optimization must consider multifunctional integration, thermal-electromechanical co-design, and advanced manufacturing compatibility.
| Technical Problem | Problem Direction | Innovation Cases |
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| The challenge involves optimizing both materials selection and packaging architecture for integrated e-corner modules—compact electric drive units that combine motor, inverter, gearbox, and suspension interfaces at each wheel. The solution must address conflicting demands: higher power density requires more active materials, yet space and weight are severely constrained by vehicle dynamics and packaging. Key subsystems include the electric motor (copper windings, laminations), power electronics (SiC modules), gearbox (gears, bearings), and thermal management (coolant paths). Optimization must consider multifunctional integration, thermal-electromechanical co-design, and advanced manufacturing compatibility. |
Replace conventional separate housings with a single, thermally conductive, lightweight composite structure that serves mechanical, thermal, and EMI functions.
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InnovationBiomimetic Hierarchical Lattice Housing with Functionally Graded Al-SiC-Graphene Composite for Multifunctional E-Corner Integration
Core Contradiction[Core Contradiction] Reducing housing mass and volume while simultaneously enhancing thermal conductivity, structural stiffness, and EMI shielding in e-corner modules.
SolutionWe propose a single-piece, additively manufactured housing using a functionally graded composite of aluminum matrix reinforced with 30–50 vol% silicon carbide (SiC) and 2–5 vol% vertically aligned graphene nanoplatelets. Inspired by bone microstructure, the housing features a hierarchical lattice core (relative density 0.3–0.5) sandwiched between dense, EMI-shielding skins (≥40 dB SE at 1–10 GHz). The lattice geometry is topology-optimized to align thermal flux paths from SiC power modules directly to coolant channels embedded via conformal cooling. This achieves **32% mass reduction** vs. standard Al housings, **2.1× higher effective thermal conductivity** (8.7 W/m·K vs. 4.1 W/m·K), and **bending stiffness >18 kN/mm**. Process: laser powder bed fusion (LPBF) with in-situ alloying at 1080°C, 200 W laser power, 1200 mm/s scan speed. Quality control: CT porosity <0.5%, dimensional tolerance ±0.1 mm (ISO 2768-m), EMI SE per ASTM D4935, thermal conductivity via laser flash (ASTM E1461). Validation status: simulation-validated (multiphysics FEM); prototype pending.
Current SolutionMultifunctional Lightweight Composite Housing with Integrated Thermal-EMI Shielding for E-Corner Modules
Core Contradiction[Core Contradiction] Reducing housing mass and volume while simultaneously improving thermal conductivity and electromagnetic interference (EMI) shielding without compromising structural integrity.
SolutionA single-piece housing is fabricated via injection molding of a thermally conductive, EMI-shielding polymer composite comprising a silicone matrix loaded with 22–27 vol% spherical silicon carbide (30 µm mean size), 9–37 vol% carbonyl iron powder, and dual-size alumina (2 µm and 45 µm). This achieves 3–4 W/m·K thermal conductivity (2× aluminum baseline) and >9 dB/cm EMI attenuation from 1–18 GHz. Mass is reduced by 32% vs. die-cast Al due to density of ~2.1 g/cm³. Structural rigidity is ensured by ≥60 vol% filler loading and optimized particle packing. Process parameters: mixing at 2,000 rpm for 25 min, degassing at 25 in-Hg for 5 min, calendering to 2–5 mm thickness, curing at 140°C for 90 min. Quality control includes ASTM D5470 thermal testing (±0.1 W/m·K tolerance), vector network analyzer EMI scans (±1 dB accuracy), and Shore 00 hardness 50–60 for compressibility. The housing serves as structural support, heat spreader, and EMI shield—eliminating separate layers.
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Integrate structural, thermal, and electromagnetic functions through generative design and advanced winding techniques.
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InnovationGenerative-Designed Multifunctional Stator Core with Embedded Conformal Windings and Integrated Load-Bearing Cooling Channels
Core Contradiction[Core Contradiction] Reducing packaging volume and mass while maintaining or improving power density, thermal performance, and structural integrity in e-corner modules through integrated structural, thermal, and electromagnetic functions.
SolutionLeveraging generative design driven by multi-physics FEA (electromagnetic, thermal, structural), the stator core is topology-optimized as a single-piece AlSi10Mg lattice structure via laser powder bed fusion, eliminating conventional housing. Conformal hairpin windings with variable cross-sections—additively manufactured using CuCrZr—are embedded directly into load-path-aligned slots, achieving 72% fill factor. Axial cooling channels double as structural ribs, carrying dielectric oil at 8 L/min (ΔT ≤15°C) with surface roughness Ra ≤4 μm for turbulent flow. Key process parameters: build layer thickness 30 μm, post-heat treatment at 300°C/4h for stress relief. Quality control: CT scanning for channel continuity (±0.1 mm tolerance), winding insulation resistance >100 MΩ @500 VDC, and modal frequency >2.5 kHz. Validated via simulation; prototype pending. TRIZ Principle #27 (Cheap Short-Living Objects) reinterpreted as multifunctional permanence—each gram serves ≥3 functions.
Current SolutionGenerative-Designed, Additively Manufactured Hairpin Windings with Integrated End-Winding Cooling and Structural Load Paths
Core Contradiction[Core Contradiction] Reducing packaging volume and mass of e-corner modules conflicts with maintaining high power density, thermal performance, and structural integrity due to competing spatial and material demands across electromagnetic, thermal, and mechanical functions.
SolutionThis solution integrates generative design and laser powder bed fusion (LPBF) additive manufacturing to co-optimize hairpin windings with embedded cooling channels and load-bearing topology. Using TRIZ Principle #24 (Intermediary) and #35 (Parameter Change), the stator end-windings are redesigned as a single-piece copper-alloy (e.g., CuCrZr) structure with conformal oil-cooling passages directly contacting conductor surfaces, achieving 20% lower copper loss via reduced AC resistance and 25% volume reduction through elimination of discrete housings and shortened overhangs. Generative algorithms optimize material distribution for both electromagnetic flux paths and mechanical load transfer, yielding a 30% stiffer structure at 22% lower mass. Process parameters: LPBF at 350 W laser power, 1200 mm/s scan speed, 30 µm layer thickness. Quality control: CT scanning for channel integrity (±50 µm tolerance), eddy-current testing for conductivity (>95% IACS), and thermal cycling validation (ΔT = 150°C, 1000 cycles). Performance verified at 87 kW peak power, 165°C max winding temperature under ISO 19453 drive cycle.
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Enable 3D magnetic flux paths and eliminate inverter-to-motor interconnects through co-packaging and material innovation.
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Innovation3D-Flux Monolithic E-Corner Module with Orthogonal-Co-Packaged SiC Inverter and SMC Stator Core
Core Contradiction[Core Contradiction] Reducing mass and packaging volume while enabling 3D magnetic flux paths and eliminating inverter-to-motor interconnects requires co-packaging power electronics and motor without degrading thermal performance or structural integrity.
SolutionWe propose a monolithic e-corner module where the inverter’s SiC dies are directly bonded onto the SMC stator back-iron using sintered silver, forming an orthogonal co-packaged structure that doubles as both electromagnetic core and heat spreader. The SMC (Somaloy®700) is steam-treated per patent WO2006/135324 to achieve ≥100 MPa TRS and μ≥800, enabling complex 3D claw-pole flux paths. Coolant flows through conformal microchannels (additively manufactured in AlSi10Mg housing) in direct contact with SiC dies and stator teeth, reducing thermal resistance by 40% (from 0.15 to 0.09 K/W). Key process: compact SMC at 1100 MPa, steam-treat at 520°C/45 min, then integrate SiC via Ag-sintering at 280°C/30 MPa. QC: FEA-validated 3D flux density ≥1.2 T, coolant leak test ≤1×10⁻⁶ mbar·L/s, dimensional tolerance ±0.05 mm (CT-scanned). Validation status: multi-physics simulation complete; prototype build pending.
Current SolutionCo-Packaged Inverter-Motor with 3D-Flux SMC Stator and Steam-Treated Structural Core
Core Contradiction[Core Contradiction] Reducing e-corner module mass and volume while maintaining power density, thermal performance, and structural integrity requires eliminating interconnects and enabling 3D magnetic flux paths, which conventional laminated steel cannot support.
SolutionThis solution integrates the inverter and motor via a soft magnetic composite (SMC) stator core fabricated from Somaloy®700 powder with 0.2–0.5 wt% stearamide lubricant, compacted at 800–1100 MPa, then heat-treated at 300°C (20 min) followed by steam treatment at 520°C (45 min). The isotropic 3D flux capability eliminates inverter-to-motor busbars, reducing length by ≥20%. Steam treatment yields transverse rupture strength ≥130 MPa, permeability ≥860, and core loss ≤70 W/kg at 1T/400Hz. Direct coolant contact with co-packaged SiC modules cuts thermal resistance by 40%. Quality control includes ISO 3995 TRS testing, FEA-validated 3D flux paths, and dimensional tolerance ±0.1 mm on net-shape molded features. Material is commercially available from Höganäs AB; process uses standard powder metallurgy tooling.
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