M.B. de Rossiter Correa

Vector control strategies for single-phase induction motor drive systems

This paper discusses vector control strategies for single-phase motor drive systems operating with two windings. A model is proposed and used to derive control laws for single-phase motor drive systems. Such model is also employed to introduce the double-sequence controller. Simulation and experimental results are provided to illustrate the operation of the proposed drive systems.

Rotor-flux-oriented control of a single-phase induction motor drive

This paper investigates the vector control of a single-phase induction motor drive to implement low-cost systems for low-power applications. The static power converter side is implemented using a single-phase rectifier cascaded with a four-switch inverter. The vector control is based upon field orientation concepts that have been adapted for this type of machine. Simulation and experimental results are provided to illustrate the system operation.

Induction motor drive system for low power applications

This paper investigates the utilization of three configurations of induction motor drives to implement low cost systems for low power applications. The static power converter side is implemented by using a single-phase rectifier cascaded with a four-switch inverter (FSI). Three types of induction machines are supplied with the static power converter. In the first scheme, a standard three-phase induction machine is employed. In the second, the load is a three-phase induction machine where only two windings are used. In the third, a standard two-phase induction machine is employed. Simulation and experimental results are provided to illustrate the operation of the systems.

A three-level MOSFET inverter for low-power drives

This paper proposes operating a three-level neutral-point-clamped (NPC) inverter using a two-level pulsewidth-modulation method. This allows for the clamping diodes to be rated at a fraction of the main switches due to their low average current requirement. The use of a bootstrap charge pump as a low-cost method to obtain the isolated gate drive power supplies is extended for use with the NPC topology. Using this control method and circuits, an inverter based on high-volume, low-cost, low-voltage power MOSFETs is experimentally demonstrated as a possible economic alternative to an insulated-gate-bipolar-transistor-based drive for 120-Vrms-supplied systems.

An Effective Induction Motor Control for Photovoltaic Pumping

A new design of an efficient batteryless pumping system powered from photovoltaic panels, comprising a push-pull converter and an induction motor, is presented. Detailed evaluation of the energy processing cycle has allowed the formulation of a set of design principles and the optimization of a sensorless induction motor drive system. The resulting performance enhancement is demonstrated experimentally.

A Novel Monitoring of Load Level and Broken Bar Fault Severity Applied to Squirrel-Cage Induction Motors Using a Genetic Algorithm

This paper deals with the diagnostic of the signature of rotor broken bars when an induction machine is fed or not by an unbalanced line voltage. These signatures are given by the complex spectrum modulus of line current. In order to make the diagnostic, a genetic algorithm is used to keep the amplitude of all faulty lines. Moreover, a fuzzy logic approach allows us to conclude to the load level operating system and to inform the operator of the rotor fault severity. Several experimental results prove the performance of this method under various load levels and various fault severities. Notwithstanding, this approach requires a steady-state operating condition. The conclusion resulting from this paper is highlighted by experimental results which prove the efficiency of the suggested approach.

Reduced Switch Count Multiple Three-Phase AC Machine Drive Systems

In this paper, two three-phase ac drive systems with reduced number of components, named configurations and , are investigated. Configuration uses multiple two-leg voltage source inverters in which all inverters share an extra-leg. Configuration also employs multiple two-leg inverters but in this case the inverters share the midpoint of a capacitor bank in the dc-link, instead. These configurations are compared to configuration that employs multiple three-leg inverters. The main characteristics of the machine drive systems are presented together with selected experimental results that demonstrate the feasibility of the proposed configurations.

Single-Phase-Input Reduced-Switch-Count AC–AC Drive Systems

In this paper, two AC-AC reduced-switch-count drive systems for single- to three-phase applications are proposed. Both drive systems provide bidirectional power flow and power factor control. The operating principles of the topologies are presented, and a control strategy is proposed in order to reduce the DC-link voltage required by the converters. Moreover, the proposed configurations are compared with the conventional half-bridge (three legs) and full-bridge (five legs) topologies. These drive systems have the potential for reducing price and are suitable for applications in which the size of the system is a critical factor. Experimental and simulated results are presented.

AC Motor Drives With a Reduced Number of Switches and Boost Inductors

This paper presents eight three-phase ac motor-drive configurations that operate with a reduced number of switches and boost inductors. Four of the configurations are single-motor drives, and four of the configurations are double-motor drives. The drives provide both bidirectional power flow and power-factor control. This paper presents the analysis and control strategy of the systems, including current control and pulsewidth-modulation strategy. In spite of using a reduced number of components, the dc-link voltage and the machine currents of some of the proposed configurations are not much larger than the equivalent values of the conventional configurations. These drive systems are suitable for applications where the size of the system is a critical factor. The experimental results demonstrate the feasibility of the proposed topologies

AC/AC converters with a reduced number of switches

This paper proposes two reduced switch count AC/AC converters. The proposed topologies allow single-phase to three-phase and three-phase to three-phase power conversion. The converters provide bidirectional power flow and power factor control. The pulse-width modulation techniques and the control strategies for providing unity power factor operation are investigated. Experimental and simulated results are presented.