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In this paper, a new variable structure position control law for a Six Phase Induction Machine (6PIM) is proposed. The algorithm based on a time-varying switching line guarantees the existence of sliding mode since the beginning of the shaft motion. Indeed, the surface is initially designed to pass through the initial representative point and subsequently moved towards a predetermined desired surface...
In this paper, a new variable structure position control law for a Six Phase Induction Machine (6PIM) is proposed. The algorithm based on a time-varying switching line guarantees the existence of sliding mode since the beginning of the shaft motion. Indeed, the surface is initially designed to pass through the initial representative point and subsequently moved towards a predetermined desired surface...
This paper deals with a new variable structure position control law for a Six Phase Induction Machine (6PIM) that is based on time-rotating switching surface. This algorithm guarantees the existence of sliding mode since the beginning of the shaft motion. Indeed, the surface is initially designed to pass through the initial representative point and subsequently moved towards a predetermined desired...
The present paper treats the effects that arise from an unsymmetrical rotor on an induction machine that is controlled with a predictive direct torque control technique. The influence of a single rotor broken bar can be clearly noticed on the simulation results presented. The electromagnetic torque and consequently the angular speed are considerably affected by a disturbance that is directly related...
A new Lagrangian formulation with complex currents is developed and yields a direct and simple method for modeling three-phase permanent-magnet and induction machines. The Lagrangian is the sum a mechanical one and of a magnetic one. This magnetic Lagrangian is expressed in terms of rotor angle, complex stator and rotor currents. A complexification procedure widely used in quantum electrodynamic is...
The paper presents a new stator flux estimator for the induction machine Direct Torque Control (DTC). The study aims to develop an estimator which gives good stator flux feedback values even when the stator resistor varies with the machine temperature. In DTC algorithm, stator electric equation is usually used to calculate the stator flux error. The value of this error is used with the torque error...
The design of a speed sensorless PWM robust control scheme for an induction motor drive in order to control the rotor speed is proposed. The proposed design is divided in two parts. In the first one it is designed a speed estimator to estimate the rotor speed. In the second one it is developed the proposed robust control. This robust control comprises two parts, the so called inverse dynamic technique...
In this paper, a new direct torque control (DTC) algorithm for six phase induction machines (6PIM) when one phase is lost will be introduced. The machine has two sets of three phase windings spatially shifted by 60deg electrical degrees. A general decoupled model of the induction machine with up to four open phases is given. Fixed switching frequency and low torque ripple are obtained using this method...
This paper investigates the use of an imaginary power based speed estimation algorithm for induction machines. The algorithm investigated was first proposed by Peng and Fukao in 1994, and has some very desirable characteristics such as insensitivity to knowledge of stator resistance, and does not use pure integrations. However, it has been shown that the algorithm does not operate stably under regeneration...
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