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This paper deals with speed control of a squirrel cage six-phase induction machine (SC6PIM) in phase opening occurrences. A decoupled model of induction machine with unbalanced structure is given to analyze the phase opening operation of the SC6PIM. In order to reduce torque oscillations created in phase opening events, a fault-tolerant operation method by using indirect rotor field oriented control...
In this work, a duty ratio control scheme for inverter fed six-phase induction machines using the direct torque control method based on a fuzzy inference system is presented. A six-phase induction machine has six windings spatially phase shifted by sixty electrical degrees. An improved steady state torque response has been achieved by using the duty ratio control and it has shown less torque ripple...
In this paper, a new fault tolerant direct torque control (DTC) algorithm for six phase induction machines (6PIM) is introduced. The machine presents two sets of three phase windings spatially shifted by 60 electrical degrees. The aim of the proposed approach consists in computing an average stator voltage vector in order to control the mean values of the stator flux and the electromagnetic torque...
This paper presents a new configuration for direct torque control (DTC) of six-phase induction motor (SPIM). In the proposed method, direct torque and flux control are applied to the SPIM using matrix converter with the conventional three-phase source as its input. The new DTC scheme for SPIM benefits the advantages of both DTC and matrix converter. The simulation results show the effectiveness of...
This paper proposes a new scheme for robust sensorless vector control of six phase induction motor. The method is based on the model current estimation, in which the controlled stator voltage is applied to the six phase induction motor so that the difference between stator currents of the mathematical model and the motor can be forced to decay to zero. To make a better dynamic response and to reduce...
In this paper two algorithms for sensorless control of induction machines, linear reduced-order and sliding mode observer will be discussed and compared. The linear reduced-order method is a third order disturbance observer which is very simple to design and execute, while the sliding mode observer is complicated. It will be shown by the simulation results that the estimated speed by the two methods...
The induction motors are extensively used in the industry because of their simplicity reason of economical technical preferences in residential, commercial and industrial systems. The unbalance voltage conditions has been taken into consideration by electrical engineers for studying power quality. Excessively growing warm for rotors and stators, defect of shock entropy armature and insulation as well...
This paper proposes a new scheme for mechanical sensorless control of symmetrical six phase induction motor. The motor has two sets of three-phase windings, spatially phase shifted by 60 electrical degrees. This sliding mode observer used, is composed of three other observers: current, flux, and speed observers. The estimated currents in the current observer are used in the flux estimation block,...
In this paper, a new direct torque control (DTC) algorithm for six phase induction machines (6PIM) will be introduced. The machine has two sets of three phase windings spatially shifted by 60 electrical degrees. This approach is based on deriving the voltage vectors in a synchronous frame rotating with the stator flux. It leads to a fixed switching frequency and low torque ripples. Simulation and...
In this paper, an adaptive neural fuzzy inference system (ANFIS) is employed for the control of a PWM based direct torque control (DTC), driving a dual three-phase induction machine (DTPIM). DTPIM has two sets of three-phase windings spatially phase shifted by gamma (=60deg in this research) electrical degrees. The proposed control scheme uses a fuzzy inference system (FIS) to modulate the phase of...
In this work a fuzzy inference system is employed for the control of a PWM based direct torque control (DTC), driving a dual three phase induction machine (DTPIM). DTPIM has two, three phase windings spatially phase shifted by gamma (=60deg in this research) electrical degrees. The proposed control scheme uses a Fuzzy inference system to modulate the phase of stator voltage vector applied to the DTPIM...
This paper provides analysis and evaluation of two main control methods: field orientation and direct torque control, for controlling a six phase induction motor under normal and open phase fault conditions. The machine has two three phase windings spatially phase shifted by 60 electrical degrees with one common neutral point. The dynamic model of the machine is based on the transformation to orthogonal...
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