Numerical Method for Power Losses Minimization of Vector-Controlled Induction Motor

Abstract

The paper devoted to energy efficiency maximizing problem of the induction motor under part-load conditions. The problem is formulated as the minimization of ohmic losses power as a function from flux-producing current in field-oriented motor operation. Control input prefiltering which transforms the dynamic time-varying optimization problem to stationary one is introduced. Update rule for control variable is proposed which speeds-up the method convergence in comparison with linear variation of input. Finally a new continuous-time search algorithm for solving the problem of minimizing power consumption was given. The statements on method behavior were formulated and convergence to local minimum was proved. The method verified in simulation and in hardware experimental setup.

One-dimensional Lumped-Circuit for Transient Thermal Study of an Induction Electric Motor

“…The general expressions of the conduction thermal resistance (Rcond) and one of the convection thermal resistance (Rconv) are respectively given by Equations (1) and (2). 1( 2)Where: e is the distance between the point masses, S is the interface area, λ is the heat conductivity, Sc is the cooling cross section between the two regions and h is the convection coefficient calculated from proven empirical dimensionless analysis algorithms.…”

“…As an illustration, Figure 6 shows the temperature evolution of the stator coil (a) and the stator yoke (b) versus the stator copper losses carried out using lumped-circuit (1) and FE model (2). Shown results are the extrapolation of the three marked points in the mentioned figure, corresponding to an average ambient temperature of 29 °C and the calculation conditions itemized in Table 4.…”

“…The energy conversion inside an electric machine leads inherently to the heat occurrence, essentially due to different proportions of iron and copper losses. In addition, an overheating of a motor is directly linked to the degradation of its performances [1][2][3]. Thus, in order to reduce such a limitation and avoid the damage of the device, it is necessary to gather the thermal analysis to the electromagnetic study during design process [3][4][5].…”

Reduction of Induction Motor Energy Consumption via Variable Velocity and Flux References

“…In [12], the approach of minimizing the power losses in the stator to find the correct references for the controllers was employed. To find the set-point value, some studies have used numerical methods [13]. Others found the value using more heuristic techniques such as genetic algorithms or swarm algorithms [14].…”

Induction Motor Drive based on Efficiency Optimisation andDrive Loss Minimization in Real-Time Control of Linkage Flux of Drive Reference

“…In addition, this model obviates computation time-consuming issue which was prevalent in past research [11]- [14]. The reason behind being less time-consuming is that this model does not need non-linear methods, including genetic algorithm (GA), artificial neural network (ANN), fuzzy systems and non-linear models reported in [15]. Past works [16]- [19] required especial requirements such as special inverter, special drive algorithm, special modulation, and etc.…”