A new way to generate a rotating magnetic field in the high frequency range

The article describes a new method of generating a rotating magnetic field of high frequency. This new measuring system is built of a magnetic circuit consisting of a ferrite torus, inside of which there are three LP windings wound on ferrite cores connected in parallel with CP capacitors. Between the three rectangular voltage signals shifted by 120 angular degrees and the LPCP circuits, three serial LSCS circuits that constitute the bandpass filter circuit are connected. In this way, the system can be powered by both sinusoidal and square signals. This significantly reduces the cost of the entire device. The necessary conditions for thermal energy release in a magnetic fluid placed in a high-frequency rotating magnetic field are given. The author presents the preliminary results of the calorimetric effect in a magnetic fluid caused by a rotating (RMF) and alternating (AMF) magnetic field. The same sample of the magnetic fluid with magnetite nanoparticles dispersed in the oil (as a carrier liquid) was studied by both methods. The heating rate temperature (dT/dt)t=0 and its dependence on the intensity and the frequency of the magnetic field was determined. Taking into account the fact that both experiments were carried out under slightly different conditions, the intrinsic loss power (ILP) was calculated in order to compare the results. They indicate that the thermal effect in RMF is more than two times greater than in AMF. This allows a significant reduction in the mass of the magnetic material needed to produce a similar thermal effect in medical applications.