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The linear vernier permanent-magnet (LVPM) motor incorporates the merits of high efficiency and low cost, which is very suitable for long stroke applications. This paper proposed a new direct thrust force control for dual inverter fed open-end winding LVPM motor to reduce force ripple. First, the topology and structural characteristics of the LVPM motor are briefly presented. Second, the mathematic...
This paper provides the comparative analysis of coreless-type permanent magnet linear synchronous machines (PMLSM) with non-overlapping windings. The comparative study is carried out on the basis of conductor winding factor. In order to aid the comparison, the new factor called thrust factor is introduced to denote the best Spp family depending on the variation of coil width ratio. From the extensive...
This paper presents a novel tubular flux-reversal transverse flux permanent magnet linear machine (FR-TFPMLM), in which both magnet and armature winding are located at the short primary side whereas the secondary side is composed of only magnetic steel. This configuration is typically used in long stroke applications to save magnet material. With different configurations of phase winding, the machine...
This paper describes a simple ripple compensation method of suspension force and torque in a bearingless surface-mounted permanent magnet (SPM) motor with two-phase integrated winding configuration. Only two H-bridges or eight power transistors are used for the proposed topology. The neutral point of each phase is connected to the middle point of the power sources to superimpose the suspension and...
The novel doubly salient slot permanent magnet linear machines (DSSPMLMs) are proposed in this paper. First, the topology and geometric parameters of the DSSPMLMs with 12 slots are introduced, and the corresponding basic operating principle is investigated. Then, feasible slot/pole combinations and winding configurations are further analyzed. To the DSSPMLMs with 12 slots, all structures with 10/11/13/14...
Permanent magnet Vernier (PMV) machines have attracted more and more attention for their merits of high torque density and simple structure. And principle of electromechanical energy conversion is the most common way to investigate the PMV machine by calculating back EMF and electromagnetic torque. In this paper, a new perspective on the mechanism of PMV machines based on the Maxwell stress tensor...
A novel single-winding bearingless switched reluctance motor with wider rotor teeth (BSRMWRW) is proposed in this article, which can realize the decoupled control of torque and levitation force and thus simplify the motor's control in the starter/generator system. First, the working principles and decoupling characteristic of BSRMWR are explained; Second, the mathematical model of torque and levitation...
Magnetic suspension pumps have been attracted attention and actively developed. These pumps can realize magnetic suspension and rotation of a rotor shaft integrated with an impeller without mechanical contact. There is now a need to develop a magnetic suspension pump that is capable of 5-axis active control while retaining a small size and low power output. However, conventional structures capable...
Bearingless motors combine in the same structure the characteristics of conventional motors and magnetic bearings. Traditional bearingless machines rely on two independent sets of winding for suspension force and torque production, respectively. The proposed Multi-Sector Permanent Magnet (MSPM) motor exploits the spatial distribution of the multi-three-phase windings within the stator circumference...
Permanent magnet track linear motor drives offer a cost-effective motion control solution in numerous industrial manufacturing processes, covering a wide range of material handling and conveyor applications. To further reduce the initial costs of a permanent magnet track linear motor drive system, discontinuous magnet tracks can be considered. However, in a discontinuous magnet track, the armature...
A maglev wind yaw system (MWYS) is proposed to decrease the yaw power with the hybrid magnet. A disc motor and a variable speed gear are introduced to weaken the coupling between the suspension force and yaw torque. Firstly, we analyze the operation principal of the MWYS, and give the detailed description of the suspension weight and rotary torque. The rotor ample turns are given based on the Magnet...
Traditionally, active magnetic levitation systems in rotor applications comprise separate motor for torque production, two or more radial active magnetic bearings (AMBs) and one axial AMB. Such an arrangement produces long rotors. Resulting AMB-rotor systems are often supercritical making the levitation control challenging. The centralization of the torque and force producing actuators shortens the...
Double-sided coreless linear motors have a crucial role in direct-driven precise linear motion applications. In this study, an optimum design effort focused on thrust force production is presented. For an applicable brushless linear motor structure, winding and permanent magnet (PM) dimensions which are providing the highest possible force are defined by using finite element analysis (FEA). It is...
This paper describes results elaborated by designing three different tubular linear drives for applications where hydraulic actuators are in common use. The superior force density of hydraulic actuators results in a challenging magnetic and mechanical design. However, electric-driven actuators offer advantages in dynamic behavior, controllability and efficiency.
We have been developing LIM-type eddy current rail brakes (LIM-ECBs). In this paper, we introduced our approach to simplify the numerical design for the armatures of LIM-ECBs and show the study of changing the number of poles under fixed external dimensions as a specific example.
Using the equations of compatibility of deformation and equilibrium between the turns of the threaded connection solved the problem of load distribution in the turns of the thread. Based on the selection of the turns of the screw and nut with different pitches of effective design-technological method enabling to align the load distribution between turns and thereby increase the durability of threaded...
Highly dynamic DC-machines, used in low power applications, often contain ironless or so called bell shaped windings. Because there is no massive iron core to support the windings, one of the limiting factors for the torque of the machine is the force on the single wires of the copper weave. Therefore, the knowledge of the force distribution on the single wires could be a helpful design criterion...
This paper investigates a three-phase 12/8 poles bearingless doubly salient permanent magnet machine (BDSPMM) with suspending windings, armature windings and PMs on the stator. Based on the topology and operating principle, the influence of PM magnetization length on the performance of the BDSPMM is analyzed and a mathematical model of radial suspending force is deduced from the magnetic circuit....
In this paper, a novel 5-phase double-sided C-core modular linear permanent-magnet synchronous machine (MLPMSM) used for the linear steering engine is researched. Firstly, the structure of the MLPMSM is depicted. Then the thrust produced by one module and the total thrust force of the machine are deduced and analyzed. In the ideal condition, all the harmonics in the thrust force can be eliminated...
In this paper, a novel flat linear switched reluctance motor with doubly-excited windings is presented. The simple structure of this motor has the advantages of the switched reluctance motor and the linear motor. The structure of doubly-excited windings also help to enhance the thrust force. The operating principle and schematic structure are shown in this paper. The thrust force is formulated by...
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