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Linear hybrid excitation flux reversal machines are very attractive for low cost long stroke applications due to their simple and cheap secondary structure. This paper proposes a new hybrid excitation flux reversal machines with consequent-pole permanent-magnet arrays first. Owing to the adoption of consequent-pole permanent-magnet arrays, usage of permanentmagnet material of the proposed machine...
Permanent magnet (PM) machines have been widely applied over the past few decades, such as renewable power generation, electric vehicles, domestic appliances, etc.
A novel E-core transverse-flux permanent magnet linear motor (TFPMLM) is proposed in this paper. Firstly, the operational principle and structural advantages of the TFPMLM are presented. Then it is simplified equivalently to one that can be resolved by Schwarz-Christoffel (SC) transformation to obtain its no-load characteristics such as flux density, PM flux linkage and cogging force instead of time-consuming...
A 3D analytical model is developed for the computation of the no-load magnetic field distribution in flux reversal linear-rotary permanent magnet actuator (FR-LRPMA) with two PM poles (PM_pole) and two ferromagnetic poles (Fe_pole) on each stator tooth. Then a 3D model for calculating the air-gap permeance is presented considering the effect of stator slot and the permeance difference of Fe_pole and...
This paper extends an analysis developed for double tubular Halbach permanent-magnet motors to account for the thrust fluctuation associated with the primary design parameters of linear motors. Established by equivalent magnetic circuit method (EMC), the air-gap magnetic field distribution, provides an accurate means of predicting the cogging force that results from end effects. Comparison shows that...
The linear-rotary permanent magnet actuator (LRPMA) has been widely used in industrial manufacturing, automation control field and so on. The mover of developed LRPMA needs a lot of NdFeB material with the Halbach structure. In order to decrease the amout of NdFeB, a novel LRPMA is proposed using interlaced poles, namely, permanent magnet (PM) poles and iron poles, as shown in Fig.1 (a), (b). The...
An accurate knowledge of the air-gap magnetic field distribution is necessary for the design of PM torque motors. The two-dimensional air-gap magnetic of the surface-mounted permanent-magnet motor can be solved by the numerical method or the analytical method. The analytical method contributes to the optimization design and structural adjustment not only because its physical concept is instinct and...
We present an effective method based on Schwarz-Christoffel (SC) mapping for computing the cogging force of a permanent magnet linear motor (PMLM). The permanent magnets (PMs) are substituted by equivalent line currents at Gaussian integration points. Using numerical SC mapping, one pole-pair of the PMLM is mapped to a configuration where the magnetic field can be solved analytically. The cogging...
This paper introduces new PMSM with high dynamic performance, and its rotor structure adopts the optimal design which is made by holing rotor core and magnet shifting. This paper designed 7.5kw PMSM, which analyzes optimization design method and discusses effects on motor performance. FEA simulation results show that the new design rotor structure improved motor's dynamic performance, and reduced...
The paper attempts to present some effectively methods to reduce cogging torque for low-speed and direct-drive(LSDD) permanent magnet motor. Meanwhile, finite element analysis software is used for magnetic field distribution. Flux line and magnetic field are symmetrical in the whole motor. The distribution regularities of flux line and magnetic field are the same.
The permanent magnet synchronous motors are widely used in various industrial applications due to many advantages such as high power density, high efficiency, low manufacturing cost and so on, but cogging torque and moment of inertia are the most important factors affecting the performance and control precision. In this paper, firstly, the cogging torque can be effectively reduced by taking the auxiliary...
First of all, a novel axial sectional claw pole machine with PM outer rotor (ASCPM) which is suitable for pump and fan is introduced briefly, and then the structure of ASCPM is presented, too. Secondly, under the conditions of loaded and unloaded respectively, analysis of magnetic filed is made to the motor. With the method of three-dimensional finite element analysis, waveforms of torque and back-EMF...
In this paper, a new permanent magnet (PM) linear motor is proposed, in which both the magnets and armature windings are placed in the short mover, while the long stator consists of iron core only. Hence, this new PM linear motor can be called as primary permanent magnet linear motor, which exhibits the advantages of robust and simple mover, low cost, high efficiency, high power factor, and high thrust...
In this paper, the authors present a cogging torque evaluation by a new two-dimensional (2-D) analytical solution of the no-load magnetic field with the slotting effect in multi-pole surface mounted permanent-magnet (PM) motors (SMPMM). The cogging torque waveforms have been compared with the finite element analysis (FEA). The analytical results are in very good agreement with those obtained by the...
In this paper a torque calculation of a permanent magnet DC commutator motor (PMDCCM) by using FEM data is performed. For the FEM calculation of the torque a 2D FEM magnetic field calculation, as very suitable for this type of geometry, is performed. Therefore a proper modelling of the motor is required. The method used for the torque calculation using FEM data is the Weighted Stress Tensor (WST)...
For satisfying the requirement of high performance motor used in modern precise direct drive numerical control (NC) rotary table, a dual-rotor permanent magnetic synchronous motor (PMSM) with series structure and phase-shifting winding is designed in this paper. The series structure induces the magnetic fields of the inner unit motor and the outer unit motor to rotate synchronously, so the synchronous...
This paper deals with a design to improve operating characteristic of spoke type BLDC motor. By reason of variation magnetic field, cogging torque is generated. Cogging torque of Spoke type motor is bigger than other type permanent magnet motor. So, this paper presents a design notch on stator and variation rotor shape to reduce cogging torque of Spoke Type motor. Through Fourier formulation of magnetic...
Great emphasis is paid on transverse flux permanent motors (TFPM) in recent years especially in powerful propulsion system. However, the cogging torque in TFPM leads to mechanical vibration and noise inevitably. This paper presents a new TFPM with combined stator and concentrating flux rotor configurations. The related design parameters that reduce the cogging torque are investigated by using equivalent...
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