Double-Stator-Single-Rotor (DSSR) surface mounted Permanent Magnet Synchronous Motor (PMSM) has the advantages of small size, light weight and high reliability. However, there are problems of large torque ripple and abundant back-EMF harmonic content. In order to improve the electromagnetic performance of the motor, a double-stator single-rotor field modulated motor (DSSR FMM) with high...
Magnetic gear (MG), as a kind of non-contact transmission component, has many advantages, such as no friction, oil-pollution free, low maintenance and easy installation, and so on.This paper proposes a novel coaxial magnetic gear (CMG) with eccentric permanent magnet structure and unequal Halbach arrays for achieving sinusoidal air-gap flux density and high output torque. The proposed model...
The magnetic field modulation type magnetic gear composite motor is a new type of motor integrating magnetic gear and permanent magnet brushless motor. Its advantage is that it has higher torque density and efficiency, and has a good application prospect in the field of low speed and large torque. According to the principle of magnetic field modulation, the air gap magnetic field of the...
There is a huge energetic potential associated to ocean waves, expressed in terms of the power per wave meter length that can be harvested, up to 60-80 kW/m in many areas near to the shore of populated areas. Among the different devices proposed to extract that power, the most extended ones are the Point Absorbers, based on the linear displacement between two bodies for which the use of...
Characteristics of fly-wheel type uninterrupted power supply (FW-USP) using superconducting induction machine (SIM) is analytically studied. In the study, it is assumed that the SIM is iron-cored and composed of Cu wire stator windings and HTS rotor windings. The rotor windings are made with HTS wires embedded in an iron rotor core and connected to HTS end-rings. The whole assemble of the...
Abstract:
Dynamo-type high-temperature superconducting (HTS) flux pump has been verified to be a practical method for the charge of HTS magnet, due to its simple structure and low cost. The nonlinear properties of HTS stator which is influenced by its substrate magnetism, play an important role on the charging performance of the dynamo-type HTS flux pump. Generally, there are three kinds...
With recent progress of fabrication technology of long length and high critical current high temperature superconducting (HTS) wires, the application of HTS wires to the windings in rotational machines becomes feasible. In most current research and development of HTS rotational machines such as large scale wind turbine generators and ship propulsion motors, the HTS wires are applied only to...
More attention is focused on high temperature superconducting (HTS) machines due to lighter weight, smaller size, higher power density and torque than conventional counterparts. An axial-type synchronous motor with Gd-123 bulk as field poles has been manufactured and tested successfully in Tokyo University of Marine Science and Technology. The rated output power of the HTS motor is 30 kW at a...
Our research group has developed a High Temperature Superconducting Induction/Synchronous Motor (HTS-ISM) for next-generation transportation equipment. It was clarified based on the experimental and the analytical studies that the fabricated HTS-ISM possesses not only the excellent steady performances such as high torque density, high efficiency, but also the novel transient characteristics...
We report the current state of research and development to realize a new design theory of High Temperature Superconducting (HTS) armatures that achieve both robustness and low-loss characteristics. In order to realize it, the self-organizing design method, which is the first-principles design method [1], and the Face-to-Face Double Stacked (FFDS) conductor technique [2] are effectively...
Superconducting motors have been studied for electric vehicles, airplanes, and so on in the world. Therefore, superconducting motors become lightweight and have a high-power density. Since REBCO superconducting tapes have tape-shapes, motors with racetrack coils as armature windings have been studied. However, racetrack coils are inferiority in the respect of increasing interlinkage flux to...
There are already a wide variety of medical mixers used in the pharmaceutical manufacturing process, and they have contributed greatly to many people suffering from diseases. However, most of the rotating machine used in current medical mixers adopt the mechanical bearing system, and dust is generated by friction with the rotating shaft. In addition, the contact rotating system has...
The demand for high power density motors for electric propulsion aircraft demands conductors capable of withstanding high frequencies (i.e., 300-1kHz), but also capable of high current density. This is because motor power increases with B, J, and w. Superconductors are attractive because of their high J which can lead also to high B, but they are presently limited to f < 300 Hz. One...
Based on the designed field current of an high temperature superconducting (HTS) synchronous motor and the cooling temperature at 30K in our laboratory,this article introduces the structure and fabrication of a novel cryostat suitable for a linear-motor type flux pump used on an synchronous motor, and reports the charging test of the HTS no-insulated (NI) double racetrack coil used in the...
