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Halbach array has been widely applied to improve the magnetic and force performance of tubular linear motors for its attractive features. Conventionally, the Halbach permanent magnet (PM) array is mounted inside the windings to be the mover. Herein, the other kind of structure in which Halbach array is mounted outside the windings also draws our interest. The magnetic and force performances of the...
Computer simulation results of an induction magnetohydrodynamic pump designed for transportation of light non-ferrous metals is carried out. An original design of pump windings is proposed and justified by the simulation.
This paper presents optimization of function control action for the electric drive with field regulated reluctance machine (FRRM). The optimization problem formulates a spatial magnetomotive force of the stator for different variants of power supplies of windings with account for limitation as a written equation of connection. The scheme of power supply includes individual current sources for each...
In this paper, results of Field Analysis of a Circular Track SLIM have been shown for the whole speed range at rated voltage and rated frequency. Particular emphasis has been laid on the Phase-to-Phase Unbalance and the resulting ripple in propulsive force. It has been shown that the unbalance becomes more prominent as the speed of the motor increases. It has been shown that the unbalance becomes...
This paper presents a two-degree-of-freedom (2-DOF) direct drive motor to achieve flexible motion control. As one of the motion control methods, robust position control is significant in order to functionalize industrial robots, machine tools, medical robots, and so on. Furthermore, these requires multi-degree-of freedom motion. Then the authors have proposed 2-DOF direct drive motor, which realizes...
In this paper, a novel 12/14 bearingless switched reluctance motor (BLSRM) with a biased permanent magnet is presented. For this novel 12/14 BLSRM structure, the torque control can be naturally decoupled from the levitation force control according to the principle of the BLSRM. Based on the novel structure, a control system is designed to verify the performance of the proposed BLSRM. On the basis...
Self levitation principle for electrical machines has been a promising research area in the last two decades. Bearingless operation of a motor with two different windings (torque and levitation force windings) requires certain design parameters such as winding space and conductors per slot to be chosen correctly. This paper discusses the design aspects of a bearingless synchronous reluctance motor...
Linear switch reluctance machine (LSRM) has been a promising alternative for linear application systems despite its low force density and high force ripples. In long stroke conveyor applications, the stator of LSRM should be laminated requiring no gap or interruptions, being a difficulty in practical use. This paper presents a dual stator LSRM with magnetically isolated rectangular segments. The presented...
The performance of a bearingless motor is determined by the levitation characteristic. This paper shows the levitation performance analysis of a kind of bearingless switched reluctance motor (BLSRM), which separate the levitation control from the torque control. Firstly, the structure and operation principle of the BLSRM are introduced briefly. What's more, the equivalent magnetic circuit method is...
This paper analyzes the conventional windings, detached windings and alternative windings for vernier reluctance dual-stator axial flux machines. The connection of winding configurations is firstly given, followed by a comprehensive comparison in aspects of no load flux linkage, cogging torque, rotor unbalanced axial force, torque, torque ripple and iron loss.
This paper presents a novel stator structure in one degree-of-freedom (1DOF) actively positioned bearingless motor. The advantages of the proposed bearingless motor are a compact axial length and high radial stiffness. Single-drive bearingless motor concept has been adapted. Both torque and active axial force are regulated independently by only one three-phase inverter and one displacement sensor...
A bearingless motor (BelM) integrates the characteristics of an electric motor and a magnetic bearing. Typically, a surface-mounted permanent magnet (SPM)-type BelM with a ring magnet magnetized in parallel is employed for high-speed operation. It is noteworthy that a carbon fiber bandage is needed to fix the ring magnet. However, when an SPM-type BelM is applied to a high-output motor, it becomes...
A continuously rising number of electric vehicle licensing is mentioned since the last few years in Germany. For a cost-efficient production of electrical engines in first-class quality and in sufficient quantity, it is indispensable to understand the process of coil winding. Thereby, the prediction of wire behavior is one of the key challenges. Therefore, a detailed model is built to investigate...
This paper comprises an overview of different aspects for wire tension control devices and algorithms according to the state of industrial use and state of research. Based on a typical winding task of an orthocyclic winding scheme, possible new principles for an alternative piezo-electric actuator and an electromechanical tension control will be derived and presented.
One of the main tasks of China's Phase III Lunar Exploration Project is to acquire lunar soil sample more than two meters deep under lunar surface and bring it back to the earth. For an essential part of drilling and sampling device, functioned as the drilling pressure providing apparatus, reasonable scheme design of the load mechanism driving unit interface guarantees the reliability of the drilling...
Conventional linear machine consists of only one stator and one mover. In this paper, a permanent magnet (PM) tubular linear motor with multiple movers is proposed to improve the efficiency of stator field. The outer and inner movers can produce independent motions by interacting with the PM stator. It can be used in large systems requiring multiple driven elements and space saving. The employment...
Along with the increased interest in high-load transport system, the linear motor has evolved from the conventional single-sided model to a double-sided model with armatures on both sides of the mover. However, the linear motor generally has armatures installed on the full length of the transport path, resulting in the increase in material costs and manufacturing time and thus limiting the application...
Due to the high efficiency and force density, linear switched flux permanent magnet machine (LSF-PMM) is gaining more and more attention in direct drive technology. For conventional LSFPPM, the structure enables the PMs and windings to be arranged on the same side, which largely reduces the manufacture cost [1]. However, with the insert of PMs into adjacent teeth, limited by the volume of primary,...
In recent years, permanent magnet (PM) machines have received increasing attention for direct-drive applications due to its high efficiency and improved power density performances [1]. In [2], a linear stator permanent magnet vernier (LSPMV) machine is proposed, in which the stator consists of an iron core wound with distributed windings and PMs mounted on the surface of the stator teeth, while the...
Large-scale superconducting direct-drive (SCDD) generators have received lots of attention in recent years, featuring high torque density, efficiency and reliability [1]. Due to the application of SC field windings, airgap flux density is large and often more than 2 Tesla (no more than 1 T in traditional machines), which could result in huge electromagnetic radial forces and vibrations in SCDD generators...
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