Research On Rotational Electric-Mechanical-Thermal Transducer And Its Magnetic Effects On Water Madium

The rotational electric–mechanical-thermal transducer is a novel electromagnetic heating device. By properly combining the system of electricity, magnetism and heat with heat transfer system using water as medium, it produces heat utilizing hysteresis, eddy currents and secondary induced current. Assisted with propulsion units, such as motors, blowers and hydroturbines etc., multi-purpose utilization of electric energy, wind energy and hydropower can be achieved. Except for outputting heat, the rotational electromagnetic field in the transducer can also soften the water flowing by so that to reduce scale. Research on the calculation method and variation regularity of its thermal power and heat transfer, and principle of rotational electromagnetic effect on water medium, will deelply explain its working principle, form the engineering calculation method, and establish the foundation of its wide application. Based on the inverse problem of loss and temperature rise in traditional electrical machines, this paper provides theoretical analysis and experimental researches on the transducer, the main content is approached as followings.Firstly, the three dimensional electromagnetic field equations of transducer is established, and the boundary condition is given considering its physical property, and the analytical solution is obtained by separation of variables. The expression of end coefficient is deduced so that the thermal power algonithm based on 2D finite element method of transducer is improved. The experimental method of thermal power is optimized, and its accuracy is tested based on a prototype. The further researches on transducer heat power is based on the works mentioned above.Further, the analytical expression of thermal power with pole pairs, air gap length, steel core length and stator inner diameter etc. is put forward. Proposed the concept of the penetration depth of thermal power density on the stator, given the specific formula of it, analyzed the discipline of the penetration depth variation with different speed, and found the effect of the penetration depth in the tranducer thermal power design. Then used the improved algorithm of thermal power and the concept of the penetration depth, analysed the discipline of thermal power density with different speed, closed slot, open slot, half-open slot and copper in the stator structure. Calculate the distribution of the thermal power density in both of stator and rotor sides with different stator structures. Actually we developed two prototypes with different stator structures, and tested its thermal power, and compared with the original prototype, to verify the theoretical analysis is correct. Established the tranducer 2D heat transfer model, give a coupled algorithm of thermal power and heat transfer. Using this algorithm, analyzed the procedure of the transducer heat transfer. The indicator of power regulation is proposed, to evaluate the heat transfer performance of the transducer, and the actual thermal power density and the characteristics of the water flow temperature rise are analyzed. As there are some foibles of the original heat transfer structures of the tranducer, a new heat transfer structure is given up, and analyzed the influence of the power regulation with the air gap length, core length, penetration depth and the rotor thermal power. A heat tranfer test platform is developed for the relevant heat transfer test. Theoretical analysis and experimental results indicate that the heat transfer structure, compared with the original structure, its heat transfer performance greatly improved.Experimental results show that the rotational electromagnetic field in the transducer changes the physical and chemical performances of water. To reveal its principle, this paper made related theoretical and experimental research. Molecular dynamic simulation is used to compute the changes of hydrogen bond between water molecules when exposing to magnetic field. Then a magnetic field generating device is designed, the constant and alternating magnetic field is used separately to process the NaCl solutions with different concentrations, the variation of conductivity is tested and the magnetic field effects on the principle of conductivity of electrolyte solution based on the experimental results are discussed. CaCO3 crystals are produced with solutions of CaCl2 and Na2CO3 of a certain concentration, each solution is treated with constant and alternating magnetic field. The X-ray diffraction spectrum of the crystal is tested and its composition changes are analyzed,and the magnetic field effects principle on the CaCO3 crystals based on the experimental results are discussed.This paper proposes the method to calculate the thermal power and heat transfer of the transducer, analyzes its variation of thermal power and heat transfer, optimizes the original design of the transducer, and investigate the effect alternation electromagnetic field on water medium. The research provides the theoretical and experimental foundation for the further research and the widespread application of the transducer.