Abstract
This paper investigates the mechanical cutting effect on the performance of induction motors. Numerical modeling of cutting effect is described in this paper. The approach inverts the degradation of the permeability model for inclusion of it into magnetic vector potential formula by Newton method. The effect of cutting on iron losses is implemented in finite element simulation. The simulation results are compared with experimental results of prototype IE4 efficiency induction motors rated at 2.2 kW. One of them was manufactured with annealed electrical steel lamination to highlight the cutting effect on the performance of the motor. The notable effect of cutting was measured in increased stator current; however, negligible differences were found in measured iron losses. The presented model in this paper follows the measurements.
Highlights
The deterioration of magnetic properties during the process of manufacturing electrical machines has attracted considerable research interest in the last twenty years
As given in [17], use of a 2D reluctivity matrix as function of both flux density and cut-edge distance to evaluate the degraded reluctivity and the associated derivative at a particular quadrature point is an intuitive approach by which to account for the cutting effect in the finite element (FE) simulation
The hysteresis loss parameters were chosen that best fit the experimental results for 60 Hz
Summary
The deterioration of magnetic properties during the process of manufacturing electrical machines has attracted considerable research interest in the last twenty years. That due to the cutting of electrical steel laminations has been identified as a factor that causes severe deterioration of magnetic properties [5,6,7,8]. The measurement-based simplified analytical model, which includes adjustment of parameters for a range of flux densities and disregards any influence of frequency, is a generally accepted approach to predict performance of electrical machines while accounting for the cutting process. The different material properties such as the single value hysteresis curve (BH curve) and iron-loss coefficient can be assigned to each slice to cope with deteriorations near the cut edge [14,15,16]. A FE formula is presented by which to simulate the locally degraded permeability of electrical steel lamination and the increase in associated iron loss due to mechanical cutting. The corresponding simulation results for a 2.2 kW IE4 induction motor are presented and compared experimentally
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