EV Motor Winding Technology 2026 — PatSnap Eureka
Electric Vehicle Motor Winding Technology Landscape 2026
Winding configuration is the primary lever for differentiating EV traction motor performance. This report maps four innovation clusters — dynamic reconfiguration, multiphase topologies, hairpin manufacturing, and magnet-free alternatives — across patent and literature evidence from 2002 to 2026, with approximately 70% of records published after 2018.
Four Innovation Clusters Shaping EV Motor Winding
EV motor winding technology spans four principal sub-domains: (1) dynamic winding reconfiguration systems that switch between star, delta, series, and parallel configurations during operation; (2) multiphase and specialized winding topologies including dual three-phase, open-end winding, and fractional-slot concentrated winding (FSCW) designs; (3) physical winding form-factor innovations such as hairpin conductors, cable winding, and additive-manufactured conductors; and (4) machine architecture-level approaches including axial flux, flux-switching, and brushless stator-mounted topologies.
The dataset spans publications from 2002 to late 2025, with the densest cluster of innovation activity between 2018 and 2025. The core technical challenge addressed across these works: simultaneously achieving wide constant-power speed range, high torque density at low speed, low copper losses across all operating points, and fault-tolerant operation — all within the thermal and packaging constraints of an automotive chassis. Research synthesised by PatSnap Analytics confirms winding losses as the dominant loss mechanism in EV machines, as documented in foundational literature on IEEE-indexed journals.
The convergence toward permanent magnet machines provides the context within which winding innovation is occurring — with magnet-free alternatives (SRM, WFSM) gaining traction as rare-earth cost and supply security concerns intensify. Organisations tracking this shift can leverage PatSnap’s IP analytics platform to monitor technology transitions in real time.
From Fixed-Winding Hub Motors to Morphable Architectures
Three distinct phases of development are identifiable across the 2002–2026 dataset, each marked by expanding technical scope and growing OEM participation.
Four Winding Clusters Driving EV Motor Innovation
Patent and literature evidence organises into four distinct technology clusters, each addressing different aspects of the torque-speed-efficiency tradeoff space.
Dynamic Winding Reconfiguration (Star/Delta/Series/Parallel)
The core mechanism involves electronically switching motor windings between configurations — most commonly star (wye) and delta — at an optimal angular velocity threshold to trade torque constant for velocity constant, preventing back-EMF from limiting further acceleration. GlobalFoundries U.S. Inc. holds at least 10 distinct active or formerly-active US patents in this space originating from a 2009 parent application. Ford’s Wye-Delta eDrive (US, 2020) and Mercedes-Benz’s variable motor configuration (IN, 2024) reflect OEM adoption. The Daimler Truck AG filing extends this to EMF cancellation during emergency towing via winding-sense reversal. R&D teams should conduct targeted FTO analysis against the GlobalFoundries family before committing to dynamic reconfiguration architectures. For broader IP analytics context, see PatSnap Analytics.
GlobalFoundries · Ford · Mercedes-Benz · Daimler TruckMultiphase and Open-End Winding Topologies
Dual three-phase configurations (six-phase machines with 30° or 0° phase displacement between winding sets) enable continued operation under partial winding failure. Research validated on a Toyota Prius 2010 IPM platform establishes that double-layer short-pitched (DS) winding configurations outperform single-layer full-pitched (SF) windings in constant-power range and fault conditions. Open-end winding PMSM drives leverage dual inverters to extend DC-link voltage utilisation and enable flexible energy distribution between two power sources without a DC/DC converter. Rivian’s dual three-phase drive unit patents (US, EP, CA, 2023) reflect commercial deployment trajectory. The H–H configuration extends this to a fully modular four-inverter powertrain enabling integrated battery-supercapacitor energy management. Teams designing next-generation motors should treat dual three-phase DS winding as a baseline, not an advanced option.
Rivian · Toyota Prius validation · Six-phase machinesAdvanced Form-Factor Windings: Hairpin, Cable, and Additive
Hairpin (rectangular cross-section, pre-formed conductor) windings offer higher slot fill factors and better thermal conductance than round-wire distributed windings, at the cost of higher AC copper losses at elevated frequencies due to skin and proximity effects. The 2022 literature explicitly identifies automation, programmability, and repeatability of the winding process as the principal challenge — not electromagnetic design — and projects hairpin as the dominant winding form for future transportation motors. Additive manufacturing (AM) enables stress-optimised conductor geometries with potential for reduced end-winding length. The first concept for automated stator cable winding (2022) evaluates robotised assembly across five distinct machine designs with projected cycle time and cost savings aligned with Industry 4.0 targets. IP and capital investment in robotic winding insertion represent high-leverage opportunities for machine builders and Tier 1 suppliers. See PatSnap materials intelligence for related conductor material tracking.
Hairpin dominant form · AM geometry freedom · Robotised assemblySwitched Reluctance and Flux-Switching Winding Topologies
Magnets-free or reduced-magnet approaches are gaining traction as rare-earth cost and supply security concerns intensify. Switched reluctance motors (SRMs) with specific winding configurations (single-layer concentrated, single-layer mutually coupled, double-layer concentrated, double-layer mutually coupled, fully-pitched) are being systematically benchmarked. Multi-stack configurations (MSCSRM, MSSRM-SR) address torque ripple. Flux-switching machines place both excitation and armature windings on the stator. A no-insulation (NI) winding technique in high-temperature superconducting (HTS) flux-switching machines demonstrates flux regulation capability despite inherent charge/discharge delays — with explicit scope to electric buses, electric aircraft, and electric ships. A 2023 WFSM study demonstrates a two-stage exciter-plus-main-motor architecture with current coordinated control strategy for full speed range, motivated explicitly by rare-earth magnet cost and supply risk. Organisations dependent on NdFeB-based PMSM architectures should track WFSM and SRM winding technology as contingency paths. WIPO PCT filings in this space are accelerating.
SRM · HTS flux-switching · WFSM · Rare-earth hedgeGeographic Filing Distribution and Application Domain Breakdown
Patent filing geography and application domain analysis from the 2002–2026 dataset reveal where winding IP is being prosecuted and for which vehicle segments.
Geographic Filing Distribution by Jurisdiction
US dominates dynamic reconfiguration filings; India has the highest volume of pending filings; EP features high-profile OEM assignees.
Application Domain Breakdown
Passenger car traction is the largest identified application domain, with in-wheel and two-wheeler segments showing rapid growth in recent filings.
Key Patent Assignees in EV Motor Winding
Among retrieved patent records with identified assignees, a concentrated filing campaign by GlobalFoundries dominates the dynamic reconfiguration cluster, with a diverse spread of OEMs covering remaining dimensions.
| Assignee | Jurisdiction(s) | Technology Focus | Filing Period | Status |
|---|---|---|---|---|
| GlobalFoundries U.S. Inc. / GlobalFoundries Inc. | US | Dynamic winding reconfiguration (star/delta/series/parallel); BEMF-constrained switching; generator-mode splitting | 2009–2015 (10+ patents) | Active / formerly active |
| Ford Global Technologies, LLC | US | Wye-Delta eDrive system for passenger car OEM deployment | 2020 | Active |
| Rivian IP Holdings, LLC | US, EP, CA | Dual three-phase drive unit; dual-motor axle with integrated dual three-phase inverter modules | 2023 | Active (3 jurisdictions) |
| Mercedes-Benz Group AG | IN | Variable motor configuration with selective star/delta winding coupling | 2024 | Pending |
| Volvo Car Corporation | EP | Adaptable EV motor; modular chain-coupled winding elements forming reconfigurable motor morphologies | 2025 | Pending |
Five Signals Shaping the Next Generation of EV Winding IP
Based on the most recent filings (2023–2026) in this dataset, four to five emerging directions are identifiable — from morphable geometries to magnet-free architectures.
Modular and Morphable Winding Architectures
Volvo Car Corporation’s Adaptable electric motor for BEVs (EP, 2025) introduces a chain-coupled plurality of winding elements where increasing winding element count generates different motor morphologies — including non-circular geometries that circumvent the vehicle cabin. This represents a departure from fixed-geometry stator design and signals a convergence between motor topology and vehicle packaging architecture.
Safety-Mode and Fault-State Winding Control
The Daimler Truck AG towing-mode EMF cancellation patent (2024) and the GlobalFoundries generator-mode winding splitting patents represent a growing category of winding control IP focused on edge-case safety scenarios rather than steady-state efficiency. This signals that fault-state winding behaviour is becoming a distinct IP prosecution target.
What This Landscape Means for R&D and IP Strategy
Five actionable signals for engineering, IP, and product strategy teams derived from the patent and literature evidence in this dataset.
- Dynamic winding reconfiguration is legally complex. GlobalFoundries’ large active US patent family (originating 2009, active through at least 2015 continuation filings) creates non-trivial freedom-to-operate considerations for any OEM or Tier 1 supplier implementing star-delta or series-parallel switching in EV traction motors. R&D teams should conduct targeted FTO analysis against this family before committing to dynamic reconfiguration architectures. PatSnap Analytics can accelerate FTO workflows.
- Dual three-phase (six-phase) winding is emerging as the production-bound standard. The convergence of Toyota Prius platform validation, Rivian dual-inverter drive unit patents, and academic benchmarking evidence suggests that dual three-phase configurations with double-layer short-pitched windings represent the current best-practice for passenger car traction — teams designing next-generation motors should treat this as a baseline, not an advanced option.
- Hairpin winding manufacturing automation is the near-term production bottleneck. The 2022 literature explicitly identifies assembly automation — not electromagnetic design — as the limiting factor in hairpin winding adoption. IP and capital investment in robotic winding insertion and quality verification processes represent high-leverage opportunities for machine builders and Tier 1 suppliers. Relevant standards are tracked by IEC.
- India has become a significant jurisdiction for EV motor winding filings. The volume of OEM filings (Mercedes-Benz, Daimler Truck, Eicher Motors) alongside active Indian institutional filings signals both a growing domestic EV market and India’s use as a strategic filing jurisdiction for two-wheeler and commercial vehicle motor IP. IP strategists should include Indian national phase in EV motor prosecution strategies. WIPO PCT data confirms the trend.
- Wound-field and flux-switching topologies represent the hedge against rare-earth supply disruption. Evidence across HTS flux-switching (2020), WFSM (2023), and SRM winding benchmarks (2021) indicates that magnet-free or magnet-reduced architectures are advancing from academic research toward pre-commercial validation. Organisations dependent on NdFeB-based PMSM architectures should track WFSM and SRM winding technology as contingency technology paths. See PatSnap’s technology tracking capabilities for supply chain risk monitoring.
EV Motor Winding Technology — key questions answered
Dynamic winding reconfiguration involves electronically switching motor windings between configurations — most commonly star (wye) and delta — at an optimal angular velocity threshold to trade torque constant for velocity constant, preventing back-EMF from limiting further acceleration. Implementations span both motor and generator modes.
Hairpin (rectangular cross-section, pre-formed conductor) windings offer higher slot fill factors and better thermal conductance than round-wire distributed windings. The 2022 literature identifies automation, programmability, and repeatability of the winding process as the principal challenge, and projects hairpin as the dominant winding form for future transportation motors.
Dual three-phase configurations are six-phase machines with 30° or 0° phase displacement between winding sets. They enable continued operation under partial winding failure. Research validated on a Toyota Prius 2010 IPM platform establishes that double-layer short-pitched (DS) winding configurations outperform single-layer full-pitched (SF) windings in constant-power range and fault conditions.
GlobalFoundries U.S. Inc. is the single most prominent filer in this dataset, with at least 10 distinct active or formerly-active US patents covering dynamic winding reconfiguration originating from a 2009 parent application. Other key assignees include Ford Global Technologies, Mercedes-Benz Group AG, Rivian IP Holdings, Volvo Car Corporation, and Eicher Motors Limited.
Switched reluctance motors (SRMs) and wound-field synchronous motors (WFSMs) are the primary magnet-free alternatives. A 2023 study demonstrates a two-stage exciter-plus-main-motor WFSM architecture with a current coordinated control strategy for full speed range, motivated explicitly by rare-earth magnet cost and supply risk.
India has the highest volume of pending filings in this dataset, with OEM filings from Mercedes-Benz, Daimler Truck, and Eicher Motors alongside active Indian institutional filings. This reflects both a growing domestic EV market and India’s use as a strategic filing jurisdiction for two-wheeler and commercial vehicle motor IP.
PatSnap Eureka searches patents and research literature to answer instantly.