Novel Adaptive Controller for Effective Magnetic Measurement Under Arbitrary Magnetization

Abstract

In the context of the ever-expanding application of soft magnetic materials, the fully controlled magnetic measurement has, therefore, become essential. It ensures not only the accurate modeling of materials but also the rigorous quality control throughout the manufacturing process, as well as the explicit communication of magnetic data in academic studies or between suppliers and customers. Due to the non-linearity and hysteresis nature of electrical steels, automatic flux density controller is required for high standard measurements. We propose in this paper a novel steady-state digital control algorithm with two loops, one to regulate amplitude and the other to correct waveform of the flux density. Measurement results for various samples tested by Epstein frame and ring specimens under different waveforms, a wide range of frequency and high amplitudes of the flux density have proven the high adaptability, accuracy and convergence speed of this controller. Its principle is discussed in details, together with the employed measurement bench.

New formulation of Loss-Surface Model for accurate iron loss modeling at extreme flux density and flux variation: Experimental analysis and test on a high-speed PMSM

“…Oscillation and deformation come as sequences. In practice, the triangular B(t) should be rounded (about 10% of B max [23]) as in Fig. 3b.…”

“…The measurement system should be exploited maximum to extend the flux density amplitude B max and the maximum rate of change (dB/dt) max or in other words the (B, dB/dt) area of the LS model. Using the bench presented with a powerful waveform control in [23], B max can reach 95% the saturation of any materials and (dB/dt) max of an Epstein sample and a ring sample are respectively around 12000 and 50000 T/s. However, the product of B max and (dB/dt) max depends on the peak power of the measurement setup.…”

An analysis of power losses in nanocrystalline and thin-gauge non-oriented SiFe materials for application to high-speed electrical machines

“…the derivative of induction, to 1.111 ± 1%. This condition is fulfilled by the use of a digital waveform controller developed at our laboratory [16].…”