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Qualitative characteristics of the electrical drive considerably depend on identification accuracy of math model parameters. In particular, it is depend on detection accuracy of stator active resistance π that is used in calculation of flux linkages, rotary speed in sensorless control systems. Paper provides analysis of influence of stator deep slot effect to stator active resistance value.
This paper presents an improved dynamic model with incorporating the saturation effects for an induction motor (IM). The improved model is simulated with MAT-LAB/SIMULINK software for transient response in terms of electromagnetic torque, rotor speed and stator current at no-load and on-load. The obtained simulated results provide a clear evidence that the conventional unsaturated model fails to predict...
This paper treats a speed-sensorless drive of a three-phase Induction Motor (squirrel-cage). The purpose is to implement an electric traction system, based on the use of IM controlled by power electronic converter. This system allows the speed control of the vehicle, forward, backward and regenerative braking. The four quadrants operation is required. The developed control strategy is based on classical...
The paper describes an analytical method which is developed for the modeling of cage induction motors (IM) including space and time harmonics effects. This model is used to predict the influence of these harmonics on the electromagnetic performances of IM drives in healthy condition and to extract significant signatures under faulty conditions such as unbalanced supply voltage. The equations which...
A comparison theory is presented for torque at starting and high speeds between a switched reluctance (SR) and a squirrel-cage induction motor (IM) of comparable size. It is shown that Lmax−Lmin of the SR motor corresponds to the secondary inductance L2 in the IM and a comparison theory is developed for the starting performance considering copper loss and high-speed behavior. It is concluded that...
A new method to reduce the torque ripple and current harmonics is presented in this paper. A conventional 2 level inverter is fed with two inductor boost converter to drive the induction motor. A Hybrid Pulse Width Modulation (HPWM) algorithm is being used to generate the pulses for the 2 level inverter. In proposed hybrid PWM both continuous PWM and discontinuous PWM techniques are employed. This...
This paper proposes a new closed loop speed control of an induction motor fed by a high performance Z-source inverter (ZSI), the speed control is based on V/F control and indirect field-oriented control (IFOC) strategies. The indirect field-oriented control based on PWM voltage modulation with voltage decoupling compensation is used to insert the shoot-through state within the switching signals. A...
In this paper the torque and the square of the rotor flux magnitude control using second order sliding mode controller for an induction motor, is proposed. Designed super-twisting controller permits to reduce chattering that is inherent in standard sliding mode control and to improve accuracy. To estimate the rotor flux and speed, an adaptive observer is proposed. The effectiveness of the designed...
Through the increasing use of electric actuators, the induction motor is now major in industrial applications and takes a particular interest for applications requiring high power and variable speed robustness and for its simplicity and its low cost. The early detection for motor deterioration can increase plant availability and safety in an economical way. To improve the reliability as a whole, a...
The performance of a synchronous reluctance motor (SynRM) depends on the direct axis inductance (Ld) and the quadrature axis inductance (Lq) of the machine. To achieve high torque density and power factor, increasing the saliency ratio Ld/Lq and making the difference of these inductances (Ld-Lq) large enough are well known methods. Otherwise, the performance of the motor will remain below that of...
This paper presents a method for estimating the torque and speed of line-start induction motor (IM). IM is being used for various purposes because that is a high trust machine for the load mechanism and can be used easily. So, IM is non-breakable. However, load mechanism sometime break. We try to check the condition of load mechanism by estimate the torque and speed of IM. We take up the motor-operated...
Field oriented control doesn't correspond to features of synchronous motor as good as it does to induction motor. Special control algorithm is proposed to provide operation, suitable for mass high-power drives. The solution is implemented and tested in two fan drives, 3.15 MW each, now in operation at a diamond mine in North-East Siberia.
The paper analyses the inductance saturation effects of an induction motor in order to be considered in the nonlinear control drive technique. The involved inductances are determined through finite element modeling of the induction machine. The impact of coupled field and circuit approach on the derived parameter variation has also been examined. The methodology is suitable for control techniques...
In this paper, analytical functions for output torque and rotor flux of indirect vector controlled induction motor are defined and analyzed. According to the defined functions, the effect of parameter variations over outputs of vector controller can be determined. Matlab/simulink based simulations is carried out to confirm the results of the analytical functions
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