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An investigation into magnetic gear modulating ring design shapes and the performance of a magnetic gear integrated into an induction machine are presented. Modulating ring construction is one of the more difficult aspects of magnetic gear design, and a compromise between magnetic performance, losses in conductive supporting parts and manufacturability is often required. Six possible designs for modulating...
This paper presents proportional integral direct torque control (PIDTC) and fuzzy direct torque control (FDTC) of induction motor (IM) using bus clamped space vector modulation (BCSVM), in which BCSVM always clamps any phase of the inverter for given switching period. Conventionally, the total cost of control scheme significantly increases in real time applications as it needs to sense three voltages,...
In recent years, the diagnosis of electric motors appealed increasingly to signal processing methods. To develop these methods, it is necessary to have a reliable mathematical model of the physical signal to be processed, in our case the signal is the stator current. Unfortunately, often this stator current can only be obtained from an expensive measurement bench, or from a complex modelling of the...
In this paper, aimed at the neutral-point potential unbalance of the three-level neutral point clamped inverter, an improved new control scheme about neutral-point potential balance was proposed and a simplified direct torque prediction scheme was used for induction motor fed by three-level inverter. Firstly, stator voltage vectors to be applied at the next time was preselected by the torque prediction...
This paper presents a novel fast speed response control strategy for the poly-phase induction motor drive system based on flux angle. The control scheme is derived in rotor field coordinates and employs the estimation of the rotor flux and its position. An adaptive notch filter is proposed to eliminate the dc component of the integration of signals used for the rotor flux estimation. To improve the...
The Volts-per-Hertz controller is designed to accommodate the variable speed commands by using the invertor to apply a voltage of correct magnitude and frequency so as to approximately achieve the commanded speed without the use of speed feedback. The studies are focused first with of open-loop and then with the closed-loop with the application of slew rate. Results show that the slew rate reduces...
Switching Table based Direct Torque Control (ST-DTC) appears as a promising control technique to be applied to power converters in the industry. However, the ST-DTC presents some drawbacks as non constant switching frequency and high torque ripples. This work proposes a DTC schemes for an induction motor fed by three-level voltage source inverter (VSI), neutral point clamped topology (NPC), with constant...
Multilevel converters offer good quality load waveforms, which is clearly beneficial to its operation. A significant drawback that affects to all multilevel topologies is the high number of components required, which is related to a high fault probability. Among all the multilevel topologies, cascade multicell converters (CM), characterized by high modularity, allow for power to be easily increased...
The working principle and space vector modulation method of matrix converter are analyzed in this paper. To provide high-performance control of induction motors and reduce the appearance of harmonics current and its impact on power grid in AC speed regulation system, the vector control system of induction motor fed by matrix converter is implemented through combing the space vector modulation of matrix...
A sensorless direct torque controlled (DTC) induction motor drive fed by a 3-level inverter is presented based on discrete space vector modulation. A novel vector synthesis sequence is proposed to solve the problems caused by the topology of the 3-level inverter, such as neutral point unbalance and excessive voltage jump, while maintaining the merits of simplicity and robustness. Fuzzy logic control...
This paper establishes the mathematical model of direct torque control (DTC) system of induction motor. Then a realization scheme of fully digitized direct torque control system is introduced with the DSP TMS320F2812 that works as the core control chip and IPM that works as main circuit. The control scheme obtains the switch control signal of inverter with the space voltage vector modulation technology...
Asynchronous motors is nowadays the most used in industrial process. In this paper we describe a new approach to detect incipient broken rotor bar and mechanical abnormalities. We use the magnitude of components created in the line current and the instantaneous power spectra of one stator phase to detect the presence of these faults in induction motors. We show that the study of components created...
The technique of decomposition of space vectors in the four-switch voltage source inverter fed three-phase induction motor is presented in this paper. The analytical results of the machine are accomplished in alphabeta complex plane by space vector decomposition and by using mixed p-z approach. Two possible modes of six step operation, utilizing in different ways only four voltage vectors are investigated...
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