I am looking for a portable air purifier, these are the options available under ₹5000

Low-cost air purifiers under ₹5000 can reduce dust, pollen and smoke, offering basic air cleaning for small rooms without high running costs.
IEEE

Optimized PI/PD/PID Controller Design for DC Motor Speed Control: A Comparative Study of Random Forest-Based Tuning & Classical Methods

Abstract: This Study explores ways to improve the speed of DC motors through comparison of traditional tuning methods, viz. Ziegler-Nichols and Cohen-Coon with a machine learning approach using Random ...
IEEE

Sensorless Control of PMSM Drives Using Octant Newton–Raphson Method and Reduced-Order EKF Considering Speed Reversal and Noise

Abstract: For back electromotive force-based sensorless control in permanent magnet synchronous motor (PMSM) drives, the conventional phase-locked loop (PLL) exhibits ...