In mining, slurry pumping, and commercial HVAC, a single Variable Frequency Drive (VFD) failure can halt operations for days—despite the motor remaining fully functional. In these environments, electrification is often constrained not by motors, but by the reliability and lifecycle cost of power electronics. Failures in high-vibration, high-dust, and thermally cycled conditions create significant downtime, while partial-load operation—typical in real systems—drives avoidable energy losses due to conservative control margins.

Toka addresses both constraints simultaneously. It is a software-defined traction drive: a mechanically robust variable-speed transmission that delivers VSD-equivalent functionality while removing high-power switching electronics from the torque path. Torque is transmitted through an elastohydrodynamic lubrication (EHL) traction interface, while control intelligence is implemented through a low-power, sensorless electromechanical loop.

Core innovation

Toka resolves the fundamental limitation of traction drives—uncertain and inefficient clamping—through a tribology-aware control architecture:

• Sensorless Force Estimation: The clamp actuator functions as both actuator and sensor. By analysing electrical response (back-EMF and current under excitation), the system infers contact force and friction state in real time without dedicated sensors.
• Torque-Based Active Preload: Clamping force is governed directly by torque demand rather than position, enabling operation close to the true traction limit while reducing excess force.
• Friction-Regime Control: The system maintains controlled kinetic friction at the interface, avoiding stick–slip behaviour and reducing hysteresis and thermal instability under varying loads. 

This transforms a traditionally passive mechanical system into a software-defined, adaptive transmission capable of stable, efficient operation in environments where electronics are difficult to harden.

Demonstrated performance and validation path

• Toka’s passive system has demonstrated ~93% mechanical efficiency on a bench-scale. This is within the range of high-efficiency VFD-driven systems under real operating conditions, despite eliminating high-power electronics from the torque path. Active preload control is analytically expected to improve efficiency by ~3–6 percentage points at partial load, where most systems operate, and is currently under validation.
• Active preload control designed to reduce uncertainty-driven losses, with the largest gains expected under partial-load duty cycles
• 45 kW-class architecture defined and under development
• Ongoing validation focuses on duty-cycle efficiency, thermal stability, and regeneration performance

Why it matters

In remote and high-downtime-cost environments, VFD replacement and associated operational losses can reach tens of thousands of dollars per incident. By removing the primary failure mode and reducing partial-load inefficiencies, Toka changes the economic viability of electrification in these settings.

Impact potential

• Enables electrification in environments currently dominated by diesel or fixed-speed systems
• Reduces downtime and maintenance burden in remote or infrastructure-constrained operations
• Improves real-world energy efficiency across variable duty cycles

Intellectual property position

• USPTO Notice of Allowance (March 2026): pivoting clamp and loading cam architecture
• Indian provisional specification filed April 2026: sensorless force estimation, dither and active preload control

Together, these establish a layered protection strategy across both mechanical architecture and control methodology.