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In this paper, a new prototype of magnetostrictive-based vibration energy harvester for power generating floor systems is presented, and its structure is constructed. The harvester utilizing the Villari effect (inverse-magnetostrictive effect) consists of a coil-wound Terfenol-D rod. To generate more electrical power, a PM (fixed on the part of cap amplifier) and variable-length air-gap are designed...
In order to master DC current carrying characteristics of high-temperature superconducting (HTS) tapes exposed to different external magnetic field and compare the difference of Bi-2223/Ag and YBCO tapes. We chose Bi-2223/Ag and YBCO tapes to experiment. From the experimental results can be analyzed that the diamagnetism of YBCO tapes is stronger than Bi-2223/Ag tape, HTS tapes more easily lose superconductivity...
Nowadays, induction heating (IH) technology; plays an important role in metal process due to its advantages such as efficiency, cleanness and safety. Among lots of IH solutions, rotary permanent magnet induction heater is proved to be a suitable one, especially for the nonmagnetic metal. Since the energy transfer efficiency improvement highly relies on the dimensional design of permanent magnet (PM)...
Testing of squirrel cage induction motor rotors for rotor cage defects while the motor is in an unassembled state is an important quality control check in the manufacturing and repair process. A new testing method using magnetic field analysis capable of identifying defects in squirrel cage inductor motor rotors is described. The rotor field analysis, RFA, testing technique is explained with finite...
Magnetically-coupled resonant wireless power transfer (MCR-WPT) has been a research focus in recent years. Multiple transmitters are employed to improve efficiency in a wide area. In this paper, the MCR-WPT system with two transmitters supplied by the same source is modeled and its equivalent circuit is depicted. The mutual inductance between the two transmitters is considered. Proper connection of...
An accurate stray loss calculation method of squirrel-cage induction motors is presented in this paper. The stray losses are divided into the stray rotor copper losses and the stray core losses, which are determined by the air gap magnetic field. The field is supposed to be completely radial and calculated by the product of stator magnetomotive forces and air gap permeance coefficient. The effect...
The ways to reduce rotor loss of a permanent magnet (PM) motor with 200kW/9000r/min for flywheel energy storage system (FESS) is discussed in this paper. Several methods are proposed to reduce the rotor loss by optimizing the structure of rotor. The air friction loss on the surface of rotor can be decreased rapidly when pressure in the sleeve is very small. So the rotor mostly works in a vacuum in...
This paper discussed an improved structure of a hybrid excitation brushless claw-pole alternator (HEBCA). The alternator flux regulation and operation performance is simulated based on 3-D FEM. Finally, a series of experimental tests carried out on a prototype are made to verify flexible control of the flux as well as machine power production capability.
Magnetic forces in large submersible tubular motors are generally caused by the strong magnetic fields in the air gap. Due to the large size of the machine, and the rather thin stator, the magnetic forces acting on the stator often make the stator deform in many practical projects. In order to figure out the deformation degree of the stator caused by the magnetic forces, this paper proposes a simplified...
According to the principle of magnetic energy virtual displacement and the characteristics of double Y shifted by 30° winding, the analytical expression of torque in six-phase permanent magnetic synchronous motor (PMSM) is derived, and the impact of harmonic magnetic field on torque is analyzed in this paper yet. On this basis, the torque performance of three-phase and six-phase PMSM with 96 slots...
We developed a 3-D parallel finite element method with prismatic edge elements for dynamic analysis of electromagnets. In this paper, the usefulness of the method is clarified through the dynamic analysis of an electromagnet behavior.
Switched reluctance machine (SRM) and flux-switching machine (FSM) with segmental rotors are different in winding patterns and control strategies. The electromagnetic characteristics of the two machines, including magnetic field, static torque, torque ripple, iron loss and efficiency, are compared by means of analytical calculation and finite element method in this paper. The analytical results of...
In order to adjust the air-gap magnetic field of the permanent magnet(PM) machine, one hybrid excitation permanent magnet synchronous generator(HEPMSG) utilizing tooth harmonic for excitation was proposed. This paper introduced the structure and principle of the HEPMSG, and the wireless transmission technology was applied for the field current control of the tooth harmonic excitation system. The rotor...
This paper proposes a novel moving-coil voice coil motor(VCM) used for driving nano-positioning device. This VCM implements bilateral Halbach array permanent magnet as the stator and three separated coils with the slotted coil skeleton as the mover. The VCM can achieve large stroke and nano-level positioning accuracy with the support of the compliant mechanism. Equivalent magnetic circuit method and...
The power transmission line is crucial to the energy system in the country. There is a strong emphasis on industry sectors. Engineers have a duty to protect and maintain power transmission lines systems. This research has brought the power transmission system of the Electricity Authority of Thailand to analyze the simulation results, proposes a set of mathematical models presenting magnetic fields...
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