Variable-frequency drive

About: Variable-frequency drive is a research topic. Over the lifetime, 837 publications have been published within this topic receiving 5691 citations. The topic is also known as: VFD.

Application of ABB Inverter in New High-Pressure Slurry Pump Coal Slurry Gasification Variable Frequency Drive

Abstract: The ABB ACS800 series drives in the new coal-slurry gasification technology in high pressure slurry pump application of variable frequency drive were analyzed.Selection,wiring,debugging,operation and maintenance of inverter were described.Application of the inverter,improved production efficiency,reduced matintenance and operation costs.

Development of Inverter Duty Motor Bearings for Si and SiC-Based Variable Frequency Drive Applications Including Advanced 4D Finite Element Modeling

Abstract: Conventional high dv/dt pulse-width modulated (PWM) inverters generate common-mode voltages (CMVs) within the motor windings, which due to the electrostatic (capacitive) coupling between the rotor and the stator windings and frame, enable voltage to build up on the motor shaft. Motor shaft voltages exceeding the dielectric capability of the bearing grease result in bearing currents that in time can damage the bearing surfaces due to electric discharge machining (EDM). This bearing current phenomenon has been widely discussed in the literature for Si-based motor drives, and more recently has been shown by the authors to be exacerbated by the higher dv/dt found in SiC-based inverters. This paper presents the development of cost-effective inverter duty motor bearings for Si- and SiC-based applications, including advanced 4D finite element modeling and experimental validation, with the ability to demonstrate longevity under varying load conditions.

Experimental Results of Variable Frequency Drive for Three Phase Induction Motor Using Microcontroller

Abstract: Induction motor for many years has been regarded as the workhorse in industrial applications. An induction motor can run only at its rated speed when it is connected directly to the main supply. However many application need variable speed operations. With the invention of variable voltage variable frequency drives (VVVF), the use of an induction motor has increased. Variable voltage variable frequency control provides a simple and cost efficient method for open-loop speed control of three phase induction motor. This technique is popularly known as V/f control. In this paper principle and operation of V/f drive is summarized. This paper include experimental results of Voltage, Current and Speed on different frequencies which shows that induction motor speed is vary according to frequency input and simultaneously supply voltage is controlled to maintain V/f ratio constant.

Optimizing the control and automation of variable torque on 3-phase induction motor using programable neuro logic controller and variable frequency drive

Abstract: This paper presents optimizing the control and automation of variable torque on 3-phase induction motor using programmable neuro logic controller (PNLC) and variable frequency drive (VFD). The system was designed by developing a transfer model of the nonlinear input current from the load cells and feed to an improved PLC model for an approximate current function which is identified by the VFD with respect to the controlled load torque to power the 4.07KW rated 3-phase induction motor. The models were implemented using control system toolbox, neural network toolbox and simulated with Simulink in MATLAB. From the simulation of the improved controller model, the step response time performance of the PLC was improved from 2.25s to 1.22s with the PNLC.The simulation result of the VFD controlled 3-PIM motor shows that 37.07% of energy (power) was conserved compared to a characterized system with 20% energy conservation rate. Keywords: 4.07KW 3-phase induction motor, PLC, ANN, VFD, Energy conservation rate