Conference Papers
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Item Speed control of BLDC motor using bridgeless SEPIC PFC with coupled inductors(Institute of Electrical and Electronics Engineers Inc., 2016) Prabhu, P.; Vinatha Urundady, U.In this paper Bridgeless (BL) Sepic PFC with Coupled Inductors (CIs) is proposed for controlling the DC voltage of Three phase VSI to control the speed of BLDC motor. DC voltage control method enables 3 phase VSI to operate at fundamental frequency and thus reduces switching losses. Sepic converter provides output voltage of positive polarity and allows both step up and step down of input voltage in order to facilitate for the speed control of motor over a wide range. Discontinuous Conduction Mode (DCM) operation of Sepic converter, automatically shapes input current. Thus provides inherent Power Factor Correction (PFC). Also it eliminates the necessity of inner current loop and thereby reduces the number of sensors required. For the same power requirement, if CIs are introduced in the power circuit of BL Sepic, it results in reduction in size and cost of the system. This also gives improved efficiency due to the reduction in core loss. 500 W BL Sepic PFC with CIs is designed ensuring its operation in DCM to supply DC voltage in the range 70 V-310 V for a BLDC motor rated 375 W, 310 V and 3000 rpm. The proposed system is simulated for above range of voltages and performance is analysed. Results indicate that BL Sepic with CIs gives better performance with regard to efficiency and THD in addition to the reduction in overall size of converter. © 2016 IEEE.Item One cycle controlled bridge-less SEPIC converter fed BLDC motor drive(Institute of Electrical and Electronics Engineers Inc., 2017) Jayachandran, S.; Prabhu, P.; Vinatha Urundady, U.This paper presents a One Cycle Controlled (OCC) Bridge-less (BL) SEPIC converter fed Brush-Less DC (BLDC) motor drive for air conditioning application. The speed control of proposed drive is obtained by Pulse Amplitude Modulation (PAM) of three-phase Voltage Source Inverter (VSI). The Pulse Amplitude Modulation is facilitated by the DC bus voltage variation via duty ratio modulation of BL-SEPIC converter switches. A non-linear technique called One Cycle Control (OCC) is used to accomplish the duty ratio control of BL-SEPIC converter. Autoshaping of supply current is achieved by designing BL-SEPIC converter to ensure Discontinuous Inductor Current Mode (DICM) operation. The Total Harmonic Distortion (THD) of supply current is maintained within the limits as specified by IEC-61000-3-2. The proposed system is designed and simulated in MATLAB/Simulink environment and its performance is analyzed for speed control over a wide range. © 2017 IEEE.Item FPGA based experimental evaluation of BLDC motor drive fed from coupled inductor based bridgeless SEPIC(Institute of Electrical and Electronics Engineers Inc., 2020) Prabhu, P.; Vinatha Urundady, U.This paper presents FPGA based experimental evaluation of BLDC motor drive fed from single-phase supply through coupled inductor based bridgeless SEPIC converter. This converter supplies an adjustable DC link voltage to the input of three-phase VSI, which serves as electronic commutator for the BLDC motor. The VSI is switched at the fundamental frequency determined by rotor position, and the variable DC link voltage provides adjustable speed (N\propto V-{dc}) in the proposed BLDC motor drive. The incorporation of coupled inductors for bridgeless SEPIC achieves compactness. The converter with coupled inductors ensures a similar performance with reduced size as that of the conventional bridgeless SEPIC. The bridgeless SEPIC incorporating coupling presented in this work has the improved features of compact size, reduced structure complexity, requirement of only one low side gate driver and the absense of circulating current. The converter can provide both supply current shaping and control of output voltage with only voltage control loop. The Artix 7, Xilinx FPGA is used to implement the control system consisting of electronic commutation logic for switching the VSI and PI controller based DC link voltage controller for switching the proposed front end converter. The control logic is implemented using Xilinx System Generator (XSG), model-based design tool in MATLAB/Simulink environment. The XSG model-based design is processed in Vivado Design Suite software to generate programmable bit file for FPGA. The experimental results are obtained to validate the achievement of adjustable speed and shaping of supply current in the proposed BLDC motor drive. © 2020 IEEE.Item Hardware Co-simulation of Pulse Amplitude Modulation Controlled BLDC Motor(Institute of Electrical and Electronics Engineers Inc., 2022) Prabhu, P.; Kulkarni, S.V.; Urundady, V.This paper describes the validation of a Field Programmable Gate Array (FPGA)-based controller for Brushless Direct Current (BLDC) motor drive using the hardware co-simulation feature enabled in the Xilinx System Generator (XSG) design tool. To control the speed of the BLDC motor, the proposed BLDC drive uses PAM control of the Voltage Source Inverter (VSI). The PAM control reduces switching losses by allowing the VSI to operate at the frequency determined by synchronous speed. At the front end, a bridgeless SEPIC provides a wide range of DC voltage to the VSI input. When compared to the topology with two separate inductors, the Bridgeless SEPIC coupled inductors reduce the overall component count and the self-inductance required. The converter is designed to operate in Discontinuous Conduction Mode (DCM) by applying a simple voltage follower approach to a SEPIC converter to achieve inherent input current shaping over a wide speed range. The precise reference voltage for the DC link is calculated in the outer speed control loop. The proposed BLDC motor drive is modeled using the XSG design tool, and the controller is implemented in FPGA. Hardware co-simulation is used to evaluate the controller's performance under dynamic conditions such as step changes in reference speed and supply voltage. © 2022 IEEE.Item Implementation of structurally pre-stressed piezo actuator based active vibration isolation system for micro milling(Elsevier Ltd, 2023) Divijesh, P.P.; Rao, M.; Rao, R.; Jain, N.; Prabhu, P.This paper presents the implementation of a structurally pre-stressed piezo actuator based active vibration isolation system incorporated with tool based micromachining setup for analyzing and comparing the milled pocket depth surface before and after isolation. A carbide micro end mill tool with 1 mm diameter and 4 flutes has been used for carrying out pocket milling experiments with and without vibrations on copper work pieces having 3 mm thickness. The machining parameters selected were spindle speed of 16,000 rev/min with 64 mm/min feed rate and 50 lm depth of cut. Two sets of pocket milling experiments were carried out using the proposed vibration isolation setup one with vibration and the other without vibration. In the first set of experiment, the source actuator was actuated for generating vibrations during pocket milling whereas in the second set of experiment, both source and isolator actuators were actuated for nullifying the vibrations generated during pocket milling. The macroscopic lens output images of the pocket depth surfaces before and after isolation were then compared corresponding to various actuation voltages at different frequencies using the proposed vibration isolation setup. Based on the macroscopic lens output images it was observed that the milled pocket depth surface obtained by actuating only source actuator showed distinct rings wherein the ring count matched with frequency and feed rate that has been provided during machining. However, the milled pocket obtained by actuating both source and isolator actuators resulted in surface characteristics with less pronounced rings similar to that of regular machining. Also the rings that has been formed showed more defined edges with the increase in actuator voltage indicating that these distinct patterns were caused due to the vibrations generated by the source actuator alone and not other factors. © © 2023 Elsevier Ltd. All rights reserved.