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High-temperature superconducting (HTS) magnet made out of coated conductors (CCs) is considered as a possible alternative for conventional LTS magnet used in MRI and nuclear magnetic resonance (NMR) because of the high critical temperature and excellent performance under strong field. However, due to the difficulty of fabricating the superconducting joints of CCs, the HTS magnet made of CCs cannot...
Electrical steel laminations used in the transformer cores and motors are subject to stresses (σ) introduced during their construction. The magnetostriction as a major source of acoustic noise of the transformer cores has high stress sensitivity and is harmful to the electrical power grid. The higher harmonics of magnetostriction are more important than the fundamental when considering transformer...
Miniature motors have attracted much attention in recent decades. In the design of miniature motors, geometry and assembly simplicity of the drive mechanism is critical. Among various drive mechanisms, the impact drive mechanism (IDM) has such simplicity that compromises the inertia force and the friction force to achieve a stick-slip motion, and thus has great potential for applications in miniature...
This paper investigates the armature reaction field and inductance feature of the hybrid excitation synchronous machine (HESM) with magnetic shunting rotor and brushless field excitation. It is shown that introduction of excitation winding has a significant effect on armature reaction of the HESM. Inductance feature is determined by the saturation of both axial and radial flux path which vary with...
Due to simple and robust configuration, and without any coils and magnets on movers, a tubular linear switched reluctance actuator (TLSRA) is a promising candidate for applications of frequently reciprocating linear motion, such as linear compressors and automotive active suspension sys-tems[1-2]. For air-gap in a TLSRA, there are the longitudinal and transverse magnetic paths due to various mover...
In the Joule Balance at the National Institute of Metrology (NIM), the dynamic measurement during the coil movement is avoided. But for this method a rather large current in the primary coil is needed to generate the necessary magnetic field in the force weighing phase. Thus the coil heating becomes an obvious uncertainty contribution. To solve this problem, a new coil system, in which the ferromagnetic...
The Joule Balance is one of the several promising methods for the precise measurement of the Planck constant h to redefine the kilogram. Compared with the Watt Balance, it benefits from its all static measurements. For the new generation of the Joule balance, a magnet system with high-permeability material is designed to reduce the problem of coil heating. Simulations are carried out to demonstrate...
The rapidly developing wind power industry demands high power generators. Direct driven permanent magnet synchronous generator (PMSG), which has the advantages of high drive train efficiency and high reliability, is promising in wind turbine applications, especially offshore. It is known, that direct driven PMSG is heavier than its geared counterparts, which increases the cost and may bring up engineering...
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