SPX177

The Helix SPX177 is a family of ultra-high-performance radial flux electric motors engineered by UK-based Helix (formerly Integral Powertrain) under its Scalable Core Technology (SCT) architecture. Originally refined through bespoke high-output programs (including project REB), the platform scales from compact, high-speed modular variants like the SPX177-45 up to bespoke, hypercar-grade iterations capable of delivering up to 650 kW of continuous steady-state power at an exceptionally low weight. Technologically, the SPX177 features a low-inductance, direct-wound winding architecture specifically developed to minimize resistance losses and thermal generation at elevated rotational speeds up to 23,500–25,000 rpm. High-output derivatives leverage a dual three-phase (2x 3-phase) winding configuration, splitting the high-voltage phase current across dual-channel inverters via six HV connections to maintain manageable current thresholds at standard automotive DC bus voltages. High-speed rotor retention is achieved via high-modulus carbon fiber rotor sleeves, complemented by an internal cooling system utilizing helical thermal jacket paths and a coaxial rotary union for direct rotor cooling. From an OEM procurement perspective, the SPX177 addresses niche, low-to-medium-volume applications across the hypercar, motorsport, and aerospace sectors where gravimetric power density is the primary design metric. Designed for integration with matched Silicon Carbide (SiC) inverters, it provides an engineering solution for premium platforms requiring maximum power output without packaging penalties.