A new ferromagnetic hysteresis model for soft magnetic composite materials based on their specific properties is presented. The model relies on definition of new anhysteretic magnetization based on the Cauchy-Lorentz distribution describing the maximum energy state of magnetic moments in material. Specific properties of the soft magnetic composite materials such as: the presence of the bonding material, different sizes and shapes of the Fe particles, level of homogeneity of the Fe particles at the end of the SMC product treatment and achieved overall material density during compression, are incorporated in both the anhysteretic differential magnetization susceptibility and the irreversible differential magnetization susceptibility. Together they form the total differential magnetization susceptibility which defines the new ferromagnetic hysteresis model. Genetic algorithms are used to determine the optimal values of the proposed model parameters. The simulated results show a very good agreement with the measured results.
COBISS.SI-ID: 8127060
A study presents a dependence of the level and harmonic structure of a cogging torque in PM motors to interlocks and notches in stator back iron, which are standard methods for stator lamination stacking. It has been established that technologies for stacking lamination packs are causing local saturation peaks in back iron which give rise to additional cogging torque harmonic components and consequently increase the total cogging torque. The estimation of the substitutive relative permeability of the interlock soft magnetic material is also discussed.
COBISS.SI-ID: 8404820
In this paper a method for parameter detection through a single phase measurement in a three phase induction machine with broken rotor bars is presented. Based on frequency response of the machine, the parameters can be obtained with only two measurements. In order to study the variation of these parameters with position of electrical rotor asymmetry, a single phase measurement at standstill is proposed. Simulations and experimental measurements confirm the theoretical assumptions.
COBISS.SI-ID: 8303956