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surface permanent magnet
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Model reference adaptive control for surface permanent magnet
Sensorless rotor position estimators of permanent magnet synchronous machines (PMSMs) are extensively used in medium and high speed applications. In this paper, proposed a novel method of adaptive control based model reference motor speed estimator. The proposed control technique is designed considering a 0.2 kW surface permanent …
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Influence of Magnet Height on Unbalanced Magnetic Force of Surface
This paper investigates the influence of magnet height on the unbalanced magnetic force in rotationally asymmetric surface-mounted permanent magnet machines without rotor eccentricities. It shows that increasing the magnet height can effectively minimise the unbalanced magnetic force in rotationally asymmetric machines having pole number …
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High-speed surface permanent magnet machines
This paper addresses the considerations and challenges of the rotor design of high-speed surface permanent magnet machines with special attention given to the rotor sleeve design including thickness and material. High-speed electric machines are becoming increasingly important and utilized in many applications. This paper addresses …
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Massachusetts Institute of Technology
This document is a brief introduction to the design evaluation of permanent magnet motors, with an eye toward servo and drive applications. It is organized in the following manner: First, we describe three different geometrical arrangements for permanent magnet motors: 1. Surface Mounted Magnets, Conventional Stator, 2.
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Permanent magnet synchronous motor
The main difference between a permanent magnet synchronous motor (PMSM) and an induction motor is in the rotor.Studies 1 show that the PMSM has an efficiency of approximately 2% more than a highly efficient (IE3) induction electric motor, provided that the stator has the same design, and the same variable frequency drive is used for …
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Detailed Design Procedures for PMSG Direct-Driven by …
This paper is committed to show a well-ordered system used to design a permanent magnet synchronous generator (PMSG). The fundamental focus of this work is the generators which are in gearless configuration, and in the fragmentary or couple of kilowatts power range. A straight lumped-component based model is introduced, which …
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Surface Permanent Magnet Synchronous Motors' Passive …
Sensorless control of permanent magnet synchronous motors is nowadays used in many industrial, home and traction applications, as it allows the presence of a position sensor to be avoided with benefits for the cost and reliability of the drive. An estimation of the rotor position is required to perform the field-oriented control (FOC), …
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Massachusetts Institute of Technology
Learn about the design and evaluation of permanent magnet motors for servo and drive applications. Compare different geometries, rating parameters, and performance …
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Three-phase exterior permanent magnet …
The Surface Mount PMSM block implements a three-phase exterior permanent magnet synchronous motor (PMSM) with sinusoidal back electromotive force. The block uses the three-phase input voltages to …
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Analytical model and optimisation design of surface…
1 Introduction. Recently, permanent-magnet (PM) machines have been widely used in commercial, industrial, agricultural and military products because of their higher power density, torque density, efficiency, lower vibration and noise [1-4].Air gap magnetic field has an important influence on the performance of PM machines, such as …
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Overview on Permanent Magnet Motor Trends and …
Surface-mounted permanent magnets present design advantages due to the creation of a strong magnetic field in the gap of electric motors, but are sensitive to the development of eddy currents and respective losses, while internal magnet configurations involve dominant losses in neighboring laminated iron parts . These are ...
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Mechanical Design of Rotors with Surface Mounted Permanent Magnets
Electric machines with permanent magnet rotors are becoming increasingly popular due to the high power density that they offer relative to other configurations. Where the speed of rotation is high, the magnets are typically mounted on the surface of the rotor and retained by an outer sleeve. In the literature, a variety of analytical models have …
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Topology Optimization of a Surface Permanent Magnet …
This article introduces a topology optimization method for a surface permanent magnet (SPM) motor with high torque density suitable for air mobility. The proposed method can be used to determine the material distribution and magnetization direction in PMs to maximize the torque density at a constant current. The torque …
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Sensorless Control of High-Speed Surface Permanent Magnet …
This paper presents an advanced sensorless control technique for high-speed surface permanent magnet synchronous motors (SPMSMs) under low switching-to-fundamental frequency ratios. The algorithm proposed aims to enhance the dynamic performance of the system while simultaneously ensuring robust steady-state characteristics. The paper …
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Mathematical Modeling of Surface-Mount Linear Permanent Magnet …
It is observed from Fig. 2.1 that there no separator between the consecutive permanent magnets and therefore a uniform air-gap is achieved which results in a non-salient tubular linear PMSM termed as tubular surface-mount linear PMSM.
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Design and Magnetic Noise Reduction of the Surface Permanent Magnet
Design and Magnetic Noise Reduction of the Surface Permanent Magnet Synchronous Machine Using Complex Air-Gap Permeance Abstract: Nowadays, developing electric motorization for land vehicles is essential owing to the crucial need to save energy. This paper presents the development of a tool used in optimal acoustic and …
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Analytical Prediction of Operational Inductances in Surface Permanent
Analytical Prediction of Operational Inductances in Surface Permanent-Magnet Synchronous Machine Abstract: This paper describes theoretical work about operational inductances of surface PM synchronous machines. An analytical method is presented to predict the direct- and quadrature-axis operational inductances …
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Comprehensive Armature Reaction Modeling and Flux …
Abstract: Surface permanent magnet vernier motors (SPMVMs) possess the potential for direct-drive applications due to the feature of high torque density. This article presents a deep investigation into the armature reaction modeling and a semianalytical optimization framework considering the constant power speed range …
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Comparison of Reluctance and Surface Permanent Magnet Coaxial Magnetic
The noncontact operation of magnetic gears offers significant potential advantages over mechanical gears. Reluctance magnetic gears (RMGs) have been proposed as an alternative to surface permanent magnet gears (SPMGs) at high speeds. This paper explains the operating principles of RMGs and provides a thorough parametric …
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Understanding permanent magnet motors | Control …
PM motor structures can be separated into two categories: interior and surface. Each category has its subset of categories. A surface PM motor can have its magnets on or inset into the surface of the rotor, to increase the robustness of the design. An interior permanent magnet motor …
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Analysis and Comparison of Permanent Magnet …
A surface-mounted permanent magnet synchronous motor (SPMSM) is an electric motor with a simple magnetic circuit design, fast responsiveness, linear torque–current characteristics, speed–voltage characteristics, and constant operating speed. SPMSMs use only magnetic torque; however, interior PMSMs (IPMSMs) have …
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(a) Surface permanent magnet motor (b) Interior permanent magnet motor
The two motors (Interior and Surface-Mounted Permanent Magnet Synchronous Motor) used in this work are of specifications 3-phase, 2 KW, 50 Hz, 4 poles, 240 V each. The transient and steady state ...
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Permanent Magnet Synchronous Motors: Types
Depending on how magnets are attached to the rotor and the design of the rotor, permanent magnet synchronous motor can be classified into two types: Surface permanent magnet synchronous motor (SPMSM) Interior permanent magnet synchronous motor (IPMSM). SPMSM mounts all magnet pieces on the surface, and …
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Analysis and Design of Surface Permanent Magnet …
HE et al. : ANALYSIS AND DESIGN OF SURFACE PERMANENT MAGNET SYNCHRONOUS MOTOR AND GENERATOR 95 . and pole number, and the least common multiplier (LCM) between the slot number and the pole number. The number of winding turns is related to the phase current the cooling methods. For the magnet …
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Improved method for field analysis of surface permanent magnet …
The field produced by the magnets in the slotted air gap of an unloaded machine is computed from the slotless air gap field solution and complex relative air gap permeance ().Zhu et al. derived the closed form solution of slotless air gap field in detail in [] and the complex relative permeance was introduced for an inner rotor machine using …
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Surface Permanent Magnet Motors Vs Interior Permanent Magnet …
The technique mainly involves adjusting the stator magnetic field to partially counteract the influence of the permanent magnet. Surface Permanent Magnet Motors. Surface permanent magnet motors fix magnets to the rotor's surface, and their mechanical strength is lower, limiting the motor's maximum safe mechanical speed.
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A new surface-inset, permanent-magnet, brushless DC …
A new five-phase, surface-inset, permanent-magnet (PM), brushless DC motor drive is proposed in this paper. The motor drive has advantages of both the PM brushless DC motor drive and the DC series motor drive. The originality is that the air-gap flux of the motor is generated by both the PM excitation and the specially controlled stator currents (two …
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Surface Permanent Magnet Synchronous Machines: High …
First, this paper proposes an accurate design methodology for continuous-duty high-speed surface-mounted permanent magnets synchronous machines, …
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Electric motor
Electric motor - Permanent Magnet, Rotor, Stator: The magnetic field for a synchronous machine may be provided by using permanent magnets made of neodymium-boron-iron, samarium-cobalt, or ferrite on the rotor. In some motors, these magnets are mounted with adhesive on the surface of the rotor core such that the …
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Analysis of a Novel Surface-Mounted Permanent Magnet …
This article presents a novel surface-mounted permanent magnet motor (SPMM) with hybrid NdFeB-Alnico magnets to achieve low cost and low torque pulsation. Based on the analysis of the effects of stator magnetomotive force (MMF) on rotor magnets, the Alnico magnets can be properly configured to avoid demagnetization. To reduce torque …
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A PI control strategy for Surface Permanent Magnet …
PDF | On Sep 1, 2021, Lei Wang and others published A PI control strategy for Surface Permanent Magnet Synchronous Motor | Find, read and cite all the research you need on ResearchGate
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Analysis of a Novel Surface-Mounted Permanent Magnet …
This article presents a novel surface-mounted permanent magnet motor (SPMM) with hybrid NdFeB-Alnico magnets to achieve low cost and low torque pulsation. Based on …
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Deep-Investigated Analytical Modeling of a Surface Permanent Magnet
Permanent magnet Vernier motors (PMVMs) possess the advantage of high torque density for high-performance applications. However, the low power factor challenge makes it unacceptable for direct-drive applications. A lack of accurate modeling method based on the motor sizing law, i.e., air-gap flux density, linear current density, …
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Analysis and Design of Surface Permanent Magnet …
Abstract— This paper presents an analytical method to design the high-efficiency surface permanent magnet synchronous motor (SPMSM) or generator (SPMSG). The air-gap …
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Surface permanent magnet synchronous machine position estimation …
This paper proposes an alternative position estimation method of surface permanent magnet (SPM) machines at low speed using high frequency (HF) voltage injection. SPM machines traditionally do not have enough spatial saliency signals because of their symmetric rotors. The proposed solution is to track the HF eddy-current …
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Surface Fields 101 | K&J Magnetics Blog
The magnitude of the magnetic field (B) is more a function of the shape of the magnet than its size. For example, a 1/4" cube has a Surface Field of 5754 Gauss.So does a bigger cube, such as a 1/2" cube (), 1" cube (BX0X0X0), or even a monster 2" cube ().Magnets that are thinner in the direction of their magnetization will generally have lower Surface …