Fuchuan Song

The application of evaporative cooling technology for an electromagnetic separator

An immersed type evaporative cooling electromagnetic separator is presented, including the prototypes configuration, procedures and outcomes of the temperature distribution simulation, as well as the results by experimental research. The comparison between the stimulation and experimental study show that the simulation methods are accurate; meanwhile, the evaporative cooling technique is an effective way for larger capacity electromagnetic separator

Analysis and Design of Cooling System in High Temperature Superconducting Synchronous Machines

Various cooling systems for High Temperature Superconducting (HTS) synchronous machines were analysed and discussed in this paper. Thermosyphon cooling has been applied in several demonstration HTS synchronous machines. The heat transfer characteristics of this method and the temperature field of rotor were investigated in details. Furthermore, open evaporative cooling and piping evaporative cooling were originally pointed out for HTS machines with different rotate speed ranges. The simulated results showed that open evaporative cooling can acquire more uniform temperature distribution of HTS windings. Piping evaporative cooling is preferred for cooling rotor of low rotate speed HTS machines. Based on above analysis, an integrated rotor cooling platform has been designed to investigate the characteristics of different cooling systems.

Optimal Design of an Innovative High Temperature Superconducting Generator With the Evaporative Cooling Stator and the Magnetic Flux Oriented Rotor

The optimal design of a 2.4 MVA high temperature superconducting (HTS) generator is presented. The main features of its configuration are the adoption of the evaporative cooling stator and the magnetic flux oriented rotor. The cross section of the field winding in rotor is in circular arch shape, and the magnetic diverter shims are embedded between HTS coils. The technical and economical parameters of the innovated HTS generator are improved effectively. With the help of the commercial software ANSOFT RMxprt and EMpulse modules, the optimal design and detailed calculation of electromagnetic and thermal fields are implemented.

Sensorless control for flux-switching permanent magnet machine based on sliding mode observer

To enhance the reliability, sensorless vector control strategy based on sliding mode observer was adopted in flux-switching permanent magnet machine. The rotor position and speed estimation algorithm was obtained according to the voltage equation on αβ coordinate system of flux-switching permanent magnet machine, which contains the information of rotor positron. Further, a flux-switching permanent magnet machine prototype and its control system were designed. At last, the sensorless control strategy based sliding mode observer was designed and verified well by experiments.

A Parallel Dual-Redundancy Flux-Switching Permanent Magnet Machine and Its Control Strategy

To satisfy the high reliability demand of driving motor used in electrical vehicles, a novel parallel dual-redundancy flux-switching permanent magnet machine was proposed in this paper, which is composed of two identical machines. The installation angle of the two rotors to eliminate specific order and all odd order harmonic components of cogging torque was derived. Further, the torque sharing control strategy of the two motors and fault- tolerant control strategy when a motor broke down were put forward based on traditional id=0 control strategy. At last, a PDFSPM prototype was designed and the experiment verified the control strategies proposed above well.

Evaporative cooling system of high current rectifier equipment

As heat flux densities grow higher, the evaporative cooling system seems to be the most effective way of removing heat from high current rectifier equipment. In order to validate the evaporative cooling system can substitute the water cooling in engineering application and get the actual operational effect, also to provide the DC power supply demands for 200MW turbo-generator model, the high current rectifier equipment with self-circulation evaporative cooing system is designed. The temperature distribution characteristics are discussed. The experimental results show that the high current rectifier equipment with the evaporative cooling system has the advantage of high efficiency, energy-saving, high-reliability, low operational cost.

Design and analysis of a high-reliability flux-switching DC generator with segmental rotor

A novel high-reliability DC generator system integrating flux-switching machine with segmental rotor, of which both armature and excited windings are located in the stator, rectifier and excitation controller was proposed in this paper. At first, the working principle of SFSM and the DC generator was introduced in detail. Further, a prototype was designed based on finite element analysis of flux-switching machine with segmental rotor, analysis of working modes of the excitation main circuit topology and the closed loop control strategy. At last, a platform was built and the experiment study including static and dynamic state characteristic was conducted. The experimental result proved the design and analysis above well.

Experimental invetigation on air-cooling condenser in close-loop self-circulating evaporative cooling system of large electrical equipments

In some particular circumstances, the air-cooling condenser must be adopted as the secondary cooler in the evaporative cooling system of large electrical equipments. For the cooling medium in the air-cooling condenser is the air and the distribution of temperature is uneven along the cooling tube, so its necessary to do deep research on it. Experiments are carried out to study the heat transfer characteristics of the air-cooling condenser used in the Close-loop Self-circulating (CLSC) evaporative cooling system. The temperature distribution and the heat transfer can be acquired from the experiment. The result showes that heat transfer can be enhanced by some special method and the air-cooling condenser can satisfy the demand of the cooling system.

Optimization of air-cooling condenser in close-loop self-circulating evaporative cooling system of large electrical equipments

Close-loop self-circulating(CLSC) evaporative cooling technology is a newly developed cooling technique in the evolution of large electrical machines and other large electrical equipments. As the driving power of the coolant in the circulating loop of the self-circulating evaporative cooling system is very small, each part of the resistance must be studied thoroughly to minimize them. This paper is devoted to the optimization of the air cooling condenser used in the CLSC evaporative cooling system of the large electrical equipment. Different types of the inlet box of the air cooling condenser are studied by both numerical simulations and experiments. By doing these, an optimal structure of the inlet box of the air cooling condenser is obtained, and it can do certain helps in the development of the evaporative cooling technology.

Shape Optimization of Field Windings in a High Temperature Superconducting Synchronous Generator with Finite Element Method

Publisher Summary This chapter presents the optimal design of high temperature superconducting (HTS) field windings in a demonstrative HTS generator model based on magnetic field analysis by finite element method. The optimal shapes of HTS magnet with iron core and without iron core are studied, and the value of the minimum vertical component of magnetic flux density passing through the surface of HTS tapes in each kind of HTS magnet is achieved. Two types of HTS rotors are analyzed. It is proved that the value of the minimum vertical component can be decreased effectively by adopting flux diverters for the configuration with iron core and by adjusting cross-sectional shape of HTS magnet for the configuration without iron core respectively. It is concluded that the iron core type HTS magnet with diverters and the nonmagnetic core type HTS magnet with step-shaped HTS magnet and iron plates are two effective ways to reduce the value of the minimum vertical component.