MUMBAI, India, July 7 -- Intellectual Property India has published a patent application (202631074260 A) filed by Arindam Mondal; Mr. Sunil Kumar Choudhary; Dr. Sanjoy Kumar Saha; Dr. Snehashis Ghoshal; and Mr. Tapas Roy on June 15, 2026, for Adaptive V/F Control Method For Ev Induction Motors To Improve Efficiency At Low To High Loads.
Inventors include Mr. Sunil Kumar Choudhary; Dr. Arindam Mondal; Dr. Sanjoy Kumar Saha; Dr. Snehashis Ghoshal; and Mr. Tapas Roy.
The application for the patent was published on July 03, 2026, under issue no. 27/2026.
Abstract: The present invention relates to an adaptive voltage–frequency (V/f) control method for electric vehicle (EV) traction motors that improves energy efficiency under partial-load operating conditions. Conventional V/f control strategies maintain a fixed voltage-to-frequency ratio to preserve motor magnetic flux, which results in over-excitation and increased core and copper losses during light-load operation. Such inefficiencies are particularly significant in electric vehicles, where traction motors frequently operate under variable speed and partial-load conditions due to real-world driving patterns. The proposed adaptive V/f control method dynamically adjusts the applied stator voltage in relation to the operating frequency based on real-time motor and system parameters, including stator current, motor speed, load demand, and DC bus voltage. By regulating the motor flux to an optimal level that matches the current load condition, the method reduces losses while ensuring stable torque production and smooth motor operation. This flexible approach effectively lowers iron losses and improves overall traction drive efficiency during low-speed cruising, urban driving, and stop-and-go situations. Unlike traditional efficiency-optimized V/f methods that depend on fixed control curves or offline tuning, the proposed approach continuously adjusts to changing operating conditions like battery voltage fluctuations, temperature changes, and motor parameter aging. The control strategy is efficient and does not need complex vector control algorithms, high-resolution position sensors, or detailed motor parameter estimation, making it ideal for cost-sensitive electric vehicle applications. The adaptive V/f control method can be implemented using standard power electronic inverters and embedded controllers found in EV traction systems. By cutting down unnecessary energy use and thermal stress, this invention helps extend driving range, improve system reliability, and promote sustainability in electric vehicles.
Disclaimer: Curated by HT Syndication.
