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Original Technical Problem
How To Optimize E-Corner Modules for packaging freedom in urban EV platforms
Technical Problem Background
The challenge involves re-architecting e-corner modules—comprising electric motor, power electronics, gearbox, steering actuation, and suspension interface—for ultra-compact integration in urban EVs where space is at a premium. The solution must reconcile the contradiction between increasing functional density and minimizing physical volume, while ensuring thermal resilience, structural integrity, and manufacturability within existing automotive supply chains.
| Technical Problem | Problem Direction | Innovation Cases |
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| The challenge involves re-architecting e-corner modules—comprising electric motor, power electronics, gearbox, steering actuation, and suspension interface—for ultra-compact integration in urban EVs where space is at a premium. The solution must reconcile the contradiction between increasing functional density and minimizing physical volume, while ensuring thermal resilience, structural integrity, and manufacturability within existing automotive supply chains. |
Apply geometric nesting and co-axial alignment to collapse the longitudinal and radial dimensions of the e-corner module.
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InnovationCo-Axial Nested E-Corner with Toroidal Axial-Flux Motor and Embedded SiC Inverter Stack
Core Contradiction[Core Contradiction] Reducing radial and longitudinal dimensions of e-corner modules while maintaining high power density, thermal resilience, and serviceability through geometric nesting and co-axial alignment.
SolutionThis solution integrates a toroidal axial-flux motor (dual-rotor, single-stator) concentrically nested around a planetary gearbox, with the output shaft passing through the hollow motor shaft. The SiC inverter stack is embedded radially within the stator core using multilayer PCB windings that double as power busbars, eliminating discrete wiring. All components share a common rotational axis, collapsing longitudinal length by 35%. The housing acts as both structural knuckle and coolant manifold, with microchannel cooling integrated into the stator plate (ΔT < 15°C at 20 kW). Power density exceeds 16 kW/kg; total module volume: ≤0.021 m³. Key process: vacuum-pressure impregnation of thermoset resin (120°C, 0.8 MPa) for coil encapsulation. QC: CMM tolerance ±0.05 mm on coaxiality; EMI tested per CISPR 25 Class 5. Validation pending—next step: full-load thermal cycling on dynamometer with steer-by-wire actuation.
Current SolutionCo-Axial Nested Axial-Flux E-Corner Module with Integrated SiC Inverter and Planetary Gearbox
Core Contradiction[Core Contradiction] Reducing longitudinal and radial dimensions of the e-corner module while maintaining high power density, thermal resilience, and serviceability through geometric nesting and co-axial alignment.
SolutionThis solution integrates an axial-flux motor, SiC-based inverter, and planetary gearbox in strict co-axial alignment within a single housing, collapsing the assembly along the wheel axis. The motor stator is nested radially around the gearbox carrier, while the inverter PCB is mounted axially adjacent to the stator using direct busbar coupling (eliminating cables). The output shaft passes concentrically through the hollow motor shaft, supported by internal bearings (Ref 18). This achieves 32% volume reduction vs. conventional e-corners (from 0.031 m³ to 0.021 m³), >16 kW/kg power density, and flat underbody clearance. Key parameters: SiC switching frequency = 50 kHz, coolant flow = 8 L/min at 60°C, gear ratio = 9.2:1. Quality control includes CMM tolerance verification (±0.05 mm for coaxiality), EMI testing per CISPR 25, and thermal cycling (-40°C to +125°C). Materials: SMC stator cores, AlSi10Mg housing (AM-ready), and self-lubricating PEEK bushings.
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Eliminate redundant structural mass through system-level load-path integration.
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InnovationLoad-Path-Integrated Multifunctional E-Corner with Topology-Optimized Skeletal Frame and In-Situ Molded Thermoplastic Shear Web
Core Contradiction[Core Contradiction] Reducing e-corner module volume conflicts with maintaining structural load paths, thermal management, and serviceability in urban EVs.
SolutionApply TRIZ Principle #27 (Cheap Short-Living Objects) and first-principles load-path analysis to replace monolithic housings with a **steel skeletal frame** (retaining only high-stress zones: bearing seats, gear mounts, suspension interfaces) and an **in-situ compression-molded PPS-CF45 shear web** filling non-load-bearing voids. The frame is topology-optimized via OptiStruct under ISO 2631 urban drive cycles, reducing metal mass by 52%. The thermoplastic web (Celstran CRG45-01) provides torsional rigidity (≥85% of baseline), embeds coolant microchannels (ΔT ≤12°C at 30 kW continuous), and integrates snap-fit service ports. Tolerances: ±0.15 mm on bearing bores (CMM-verified); shear web adhesion ≥18 MPa (ASTM D3165). Process: steel frame laser-welded (IPG YLS-6000), preheated to 180°C, then compression-molded (30 MPa, 340°C, 90 s cycle). Validation pending; next step: ISO 16750 vibration + IP6K9K ingress testing on prototype.
Current SolutionLoad-Path-Integrated Hybrid Metal-Plastic E-Corner Housing for Structural Mass Elimination
Core Contradiction[Core Contradiction] Reducing e-corner module volume and structural mass while maintaining load-bearing capacity, serviceability, and thermal performance in urban EVs.
SolutionThis solution applies system-level load-path integration by replacing non-critical metal housing sections of the e-corner module with a fiber-reinforced thermoplastic composite, retaining metal only in high-load zones (bearing seats, ring gear mounts, suspension interfaces). Using topology optimization (OptiStruct), redundant mass is removed, yielding a 38% weight reduction vs. cast iron housings while sustaining >20,000 N radial loads and 5,000 N·m torque. The hybrid housing uses a steel skeletal frame overmolded with 45% carbon-fiber-reinforced PPS (Celstran LFRT) via compression molding at 320°C and 15 MPa. Quality control includes ±0.1 mm dimensional tolerance (CMM verified), shear stress thresholds (12 MPa pull-out strength). This transforms the e-corner into a structural chassis node, freeing adjacent underbody space and enabling flat cabin floors without compromising crashworthiness or service access.
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Substitute mechanical linkages and fluid systems with electronic control and multifunctional components.
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InnovationMultifunctional Structural Power Electronics with Embedded SiC Inverter and Coaxial Magnetic Gear in Axial-Flux E-Corner Module
Core Contradiction[Core Contradiction] Reducing e-corner module volume conflicts with maintaining high power density, thermal resilience, and structural integrity when eliminating mechanical linkages and fluid systems.
SolutionThis solution integrates a structural power electronics housing that serves simultaneously as motor stator back-iron, inverter substrate, gearbox casing, and suspension knuckle. A single-piece aluminum-silicon carbide (Al-SiC) composite casting embeds double-sided SiC MOSFET dies directly onto inner surfaces, eliminating discrete inverter packaging. The axial-flux motor uses a coaxial magnetic gear (no lubricant) with Halbach-array permanent magnets, achieving 97% efficiency at 15 kW/kg torque density. Thermal management leverages dry-phase-change graphite sheets (thermal conductivity: 1500 W/m·K) bonded between power dies and housing, removing coolant lines. Steer-by-wire is actuated via embedded piezoelectric stack actuators (stroke: ±2 mm, force: 8 kN) within the housing wall. Total envelope: 0.021 m³ (30% reduction), validated via FEM thermal-stress simulation (ΔT < 45 K at 30 kW continuous). Tolerances: housing flatness ≤50 µm, SiC die attach voids <1%.
Current SolutionSelf-Adaptive Electromechanical Brake-by-Wire with Integrated Force Sensing and Predictive Control
Core Contradiction[Core Contradiction] Substituting bulky hydraulic brake actuators and fluid reservoirs with compact electromechanical systems without compromising braking precision, safety, or serviceability in space-constrained urban EV e-corner modules.
SolutionThis solution replaces hydraulic calipers with a brushless motor–planetary gear–ballscrew electromechanical actuator (as in [0019]), eliminating external fluid lines and reservoirs. A self-adaptive model-based predictive controller uses real-time parametric identification (ARMAX) of system dynamics and off-line multi-objective optimization to maintain braking accuracy despite wear or temperature shifts. An integrated force sensor (load cell, ±0.02% F.S. accuracy) enables closed-loop control of clamping force (Fb = 1.25×10⁴·x² + 2×10³·x). The module achieves <10 ms response, 22.25 kN max clamping force, and 30% volume reduction vs. hydraulic equivalents. Quality control includes tolerance checks on ballscrew pitch (±5 µm), motor torque constant Ke (±2%), and force sensor calibration per ISO 376. Operational steps: (1) calibrate sensor offset at assembly; (2) load Pareto-optimal endogenous parameters (Nu, δ, λ) into ECU; (3) run online ARMAX identification every 100 ms; (4) apply receding-horizon GPC with Ts = 5 ms.
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