Torque Ripple Minimization of Variable Reluctance Motor Using Reinforcement Dual NNs Learning Architecture

Abstract

The torque ripples in a switched reluctance motor (SRM) are minimized via an optimal adaptive dynamic regulator that is presented in this research. A novel reinforcement neural network learning approach based on machine learning is adopted to find the best solution for the tracking problem of the SRM drive in real time. The reference signal model which minimizes the torque pulsations is combined with tracking error to construct the augmented structure of the SRM drive. A discounted cost function for the augmented SRM model is described to assess the tracking performance of the signal. In order to track the optimal trajectory, a neural network (NN)-based RL approach has been developed. This method achieves the optimal tracking response to the Hamilton–Jacobi–Bellman (HJB) equation for a nonlinear tracking system. To do so, two neural networks (NNs) have been trained online individually to acquire the best control policy to allow tracking performance for the motor. Simulation findings have been undertaken for SRM to confirm the viability of the suggested control strategy.

High-Speed Design with Separated Tapering for Reducing Cogging Torque and Torque Ripple of a 3 kW Dry Vacuum Pump Motor for the ETCH Process

“…The equation for hysteresis loss and eddy current loss for a permanent magnet is expressed as Equation (2). Losses occurring in motors include copper loss, iron loss, and eddy current loss, and eddy current loss in permanent magnets causes temperature rise in permanent magnets and irreversible demagnetization.…”

“…This tapering method in which Lst and Lct, are applied simultaneously is defined as separated tapering. The reason for separating the axis into two on both sides is explained below [2,3]. If tapering is performed only on the existing L ct , it is applied even to areas where tapering is not required.…”

“…This tapering method in which L st and L ct , are applied simultaneously is defined as separated tapering. The reason for separating the axis into two on both sides is explained below [2,3]. Figure 5 shows the process where magnets are pushed inside the rotor during conventional tapering.…”

“…It is important to reduce torque ripple, a major cause of vibration and noise in motor design [1]. Among the causes of torque ripple, there are reasons related to the mechanical structure [2,3]. Research on SRM motors with altered shapes to reduce torque ripple [2], as well as studies on torque-ripple reduction through skewing, is active [3].…”

“…Among the causes of torque ripple, there are reasons related to the mechanical structure [2,3]. Research on SRM motors with altered shapes to reduce torque ripple [2], as well as studies on torque-ripple reduction through skewing, is active [3]. One of the causes of torque ripple is cogging torque.…”