Conveners
Wed-Mo-Po3.13 - Motors X
- Qiuliang Wang (IEE CAS)
- Hao Chen (China University of Mining & Technology)
Compared with conventional rotary machines, linear motors have no mechanical transmission device and, therefore, offer higher transmission efficiency, lower noise and easier to maintain. Hence, they have attracted a lot of attention in urban rail transit recently. Among them, linear induction motor (LIM) merits the advantages of simple structure, and has been applied in some countries....
A high temperature superconductor tri-axial CORC cable has been designed for all electrical aircraft. This paper is to study the magnetization loss of this tri-axial cable under time-varying external magnetic field. This cable is wound with ReBCO tapes from SuNAM, Korea. An experimental platform is built to measure the magnetization loss using an electrical method. The tri-axle cable is...
This paper proposes optimizing the magnetization direction of isotropic ferrite permanent magnets (Fe-PM) to enable the maximization of back-electromotive force (B-EMF), torque density, and minimum torque ripple of surface permanent magnet brushless direct current motor. The concept design is divided into two steps. First, two general Fe-PM electric oil pump motor models with radial and...
Recently, as the demand for high-speed trains increases, studies on the stability of high-speed trains are actively under way. In the conventional case, most of the high-speed trains were driven by friction with the rails mounted on the rotating electric motor. In this case, unevenness and friction between the rail and the wheel caused the driving performance to drop, causing large vibration...
A policy that mandates the use of high-efficiency devices in order to use energy resources reasonably is being implemented. Induction motors are the most commonly used energy consuming equipment and are highly effective in high efficiency design. For the design of high efficient induction motor. satisfying the high starting torque, the double bar type bar type rotor was designed. In the case...
The design of a cylindrical linear generator involves the calculation of the stator winding as a function of the magnetic field inside the solenoid, in such a way that the generation of the voltage obtained will be a function of the number of turns and the speed of the movement of the magnetic field inside. On the other hand, the use of HTS tapes in applications of linear electrical machines...
High-temperature superconducting (HTS) machines received tremendous attention recently in the high power applications such as wind power generators and electric propulsion for ships, as they offer both high power density and high efficiency with the improving performance of HTS windings. In conventional HTS motors, HTS field windings are commonly constructed with HTS coils which supplied with...
Due to the application limitation of permanent magnet and the ever-growing market requirement on linear motional equipment, the wound field linear machines are still drawing much attention. In this paper, a novel wound field flux reversal linear machine (WFFRLM) is proposed, which has both excitation windings and armature windings on a dual-side primary core, offering high thrust density and...
Motivated by growing needs for high speed transportation system, Korea Railroad Research Institute (KRRI) has developed the core technology of HTX (HyperTube eXpress) that operates vacuum tube above 1000 km/h. In order to achieve subsonic speed and dynamic stability, efficient propulsion and levitation systems are required, and consequently the subsonic capsule train has been developed by the...
The induction motor(IM) is used in a variety of fields such as home appliances and factories, automobiles and railroad cars. Therefore, each motor has different target performance and the shape of the rotor is different. Use a cage rotor(CR) when the efficiency of the IM is important, and a double cage rotor(DCR) when starting torque is important. Starting torque and efficiency are in a...
Linear synchronous motor is expected to be widely used in pulse power application, such as electromagnetic launch. A High Temperature Superconducting linear synchronous motor (HTS-LSM) for pulse power application is developed in this paper. A HTS winding is used as the moving coil, the stator coil is wound with copper winding. The superconducting winding has been excitation to flow DC current...
The “Bitter” magnet has been serving high field science community over decades, since its first implementation by MIT in the 1930s and its variation of the Florida Bitter by the National High Magnetic Field Laboratory in the 1990s. With a proper water-cooling environment, average current density of such a bitter magnet reaches ~600 A/mm^2 with a field generation capacity of >40 T. This paper...
