Permanent Magnet Synchronous Motor Traction System—An …
The permanent magnet synchronous gearless traction machine uses permanent magnets rather than an excitation current to generate a magnetic field. The mechanical transmission efficiency can reach 98% because the gear box is eliminated and the traction wheel is directly driven by the electric motor. And, the power factor of gearless traction ...
Sekilas Tentang PMMC (Permanent Magnet Moving Coil)
PMMC (Permanent Magnet Moving Coil) merupakan sebuah instrumen dasar yang dapat digunakan untuk mengukur arus listrik. Perangkat ini telah banyak diaplikasikan sebagai instrument dasar untuk mengukur arus, tegangan, hambatan dan besaran listrik lainnya.
Research on Demagnetization Mechanism and Test Method of …
In this paper, the demagnetization problem of ferrite permanent magnet assisted synchronous reluctance motor (SynRM) is studied. The demagnetization equivalent magnetic circuit model of motor is established. The demagnetization mechanism of the motor is analyzed. The test method of dynamic demagnetization test of motor is proposed and the test platform is built. The results …
Design of a Continuously Varying Electro-Permanent Magnet …
However, this paper presents a novel approach by implementing Electro-Permanent Magnet (EPM) technology. A single short electric pulse is enough to switch On and Off the adhesion force, and by controlling its amplitude the magnetic force can be driven to a desired value, enabling the continuously varying of the magnetic adhesive force.
Permanent Magnet Mechanism Magnetic Actuator – Xiamen …
The reverse magnetic field generated by the coil offsets the magnetic field of the permanent magnet. The holding force is smaller than the force of the overtravel spring. Under the action of the opening spring, the moving The iron core is separated from the main body of the mechanism, and the moving iron core drives the transmission shaft to keep the circuit breaker in the open …
AC Machines: Permanent Magnet Synchronous and Induction …
Permanent magnet synchronous machines (PMSM) also known as brushless DC machines (BLDC) form an important group of electric machinery that are being considered for variety of applications including electric propulsion of modern vehicles. PMSM is an electromechanical energy conversion device formed by a conventional AC stator (i.e., …
21.2: Magnets
Ferromagnets. Only certain materials (e.g., iron, cobalt, nickel, and gadolinium) exhibit strong magnetic effects. These materials are called ferromagnetic, after the Latin word ferrum (iron). A group of materials made from the alloys of the rare earth elements are also used as strong and permanent magnets (neodymium is a common one).
Apa itu Magnet Permanen dan Bagaimana Cara …
– Magnet Samarium-Cobalt, ini adalah salah satu dari jenis magnet bumi yang cukup langka. Magnet permanen ini dibuat dari perpaduan samarium dan kobalt. – Alnico Magnet, merupakan magnet yang mengandung …
Modeling and Optimization of Electromagnetic Conversion …
Purpose Due to the difficulty of establishing an accurate analytical model of magnetic induction intensity in the case of multiple permanent magnet layouts, it is necessary to develop a mathematical model that can accurately describe the magnetic field distribution around multiple permanent magnets from the basic electromagnetic field theory. Optimization of …
Permanent Magnet Materials and Applications | SpringerLink
For magnetic levitation of a moving vehicle (MAGLEV), a permanent magnet track provides either attraction to a soft iron sheet or repulsion via eddy currents which is generally possible but very expensive. A permanent magnet can also be used for magnetic sensor devices. Here the change of magnetic flux between a stationary permanent magnet and ...
Quantitative Analysis of Electromagnetic Torque Generation
This paper proposes two axial-flux permanent magnet (AFPM) machines, i.e., NS and NN type, which all have the same stator and rotor structures but the different magnetic circuits. Since both PM magnetomotive force (MMF) and armature reaction MMF of the proposed AFPM machines are modulated by H-type armature stator, more field harmonics that contribute …
Perspectives for high-performance permanent magnets: applications ...
In other words, a permanent magnet is a ''bulk'' polycrystalline material rather than a thin-film or a nanomaterial. However, the core properties of permanent magnets, namely the large residual magnetic polarization and the coercivity, are the manifestation of the quantum properties of electrons in the macroscopic scale as a result of strong ...
Energy Efficient Rare Earth Lifting Permanent Magnet
The optimal saving energy permanent magnet lifting chuck has been designed. Working principle of this technology is introduced. Magnetic circuit design is carried out by finite element method (FEM).
What is a Permanent Magnet Moving Coil (PMMC) …
What is a Permanent Magnet Moving Coil (PMMC)? A Permanent Magnet Moving Coil (PMMC) meter – also known as a D''Arsonval meter or galvanometer – is an instrument that allows you to measure the …
A bi-stable mechanism actuated by patterned permanent magnet …
The actuation is achieved via permanent magnet (PM) on the suspended mass and micro-coils embedded in the bottom plate. Different from spiral coil and central core in conventional design, micro-coils in this paper integrate Cu and Ni together as a whole, acting as both coil and ferromagnetic core. ...
Design of a Continuously Varying Electro-Permanent Magnet
presents a novel approach by implementing Electro-Permanent Magnet (EPM) technology. A single short electric pulse is enough to switch On and Off the ad-hesion force, and by controlling its amplitude the magnetic force can be driven to a desired value, enabling the continuously varying of the magnetic adhesive force.
Micromagnetics of rare-earth efficient permanent magnets
In permanent magnet applications the rate of change of the external field is much slower. For example, low speed direct drive wind mills run at about 20 rpm and motors of hybrid vehicles run at 1500 rpm to 6000 rpm, which translate into frequencies ranging from 1/3 Hz to 100 Hz. The magnetization always reaches metastable equilibrium before a ...
A Novel Style Design of a Permanent-Magnetic Adsorption Mechanism for …
Abstract. Magnetic adsorption mechanisms are widely used for wall-climbing robots to manipulate a locomotive on the surface of a magnetic conducting metal. However, the reported magnetic adsorption mechanisms are subject to the problems such as the lack of adsorption capability, the weakness of kinematic performance, and the overwhelming …
Permanent Magnet Mechanism Magnetic Actuator – Xiamen …
The monostable permanent magnet mechanism is a master of metal materials, mechanics, and power electromagnetic technology application research. The core includes a magnetic core, an excitation coil, a functional spring, and other parts. ... Beranda / PRODUK / Mekanisme Operasi / Permanent Magnet Mechanism Magnetic Actuator Aktuator Magnetik ...
Coercivity mechanisms in nanostructured permanent magnets
Coercivity mechanisms in nanostructured permanent magnets: G P Zhao() 1,2,3, L Zhao ... However, an exact simulation of magnetic reversal in permanent nanomagnets requires many meshes to mimic the thin domain wall well. Nucleation and pinning are the two main coercivity mechanisms in permanent magnets. The former signifies the ...
Permanent Magnet
Permanent Magnet Assemblies. J.M.D. Coey, T.R. Ní Mhíocháin, in Encyclopedia of Materials: Science and Technology, 2001 4 Concluding Remarks. Permanent magnet structures are well suited to generate uniform fields, which are static or variable, as well as multipole field patterns and field gradients with rapid spatial variation. The advantages of permanent magnets are their …
Permanent Magnet
The suitable permanent magnet materials are well identified by the magnetic hysteresis loop in Fig. 3.1.When an external magnetic field (magnetomotive force, H) is applied to a ferromagnetic material, the material becomes magnetized (magnetic flux B or M) and will stay magnetized infinitely.The relationship between field strength H and magnetization B is not …
The Demagnetization Harmonics Generation Mechanism in Permanent Magnet ...
Partial demagnetization is a condition that may occur in Permanent Magnet machines due to overloading or thermal stress. Whenthis happens, the magnetic field locally weakens leading to an asymmetry of the air-gap field. This asymmetry will cause harmonics, which will be expressed as extra losses and mechanical oscillations. Moreover, since the field becomes weaker, more …
Perspectives on Permanent Magnetic Materials for …
Permanent magnet development has historically been driven by the need to supply larger magnetic energy in ever smaller volumes for incorporation in an enormous variety of applications that include consumer …
A New Perspective on High-Torque-Density Mechanism of Permanent Magnet ...
This paper presents a new perspective on high-torque-density mechanism of the various emerging permanent magnet (PM) vernier machines (PMVMs) by employing torque quantification of their working harmonics. In order to illustrate the high-torque-density mechanism, some typical PMVMs with integral-slot (IS) and fractional-slot (FS), single modulated teeth …
Generation Mechanism and Suppression Measure of …
Permanent magnet synchronous machine (PMSM), has received extensive attention in electrified transportation system due to the high efficiency, high power density and compact structure. The electromagnetic (EM) vibration performance is an important specification for the PMSM, as it affects the passenger''s riding comfort and the noise grade of electrified …
DESIGN AND PARAMETRIC INVESTIGATIONS OF PERMANENT MAGNET …
Tovarnov et al. [13] have developed a model of a magnetic-tape locomotion mechanism for wall climbing robot and have proposed mathematical model of the motion of a mobile robot on vertical surface. Shen et al. [14] have described the design aspects of locomotion and magnetic adhesion of permanent magnet and its embedded system.
The Demagnetization Harmonics Generation Mechanism in Permanent Magnet ...
N2 - Partial demagnetization is a condition that may occur in Permanent Magnet machines due to overloading or thermal stress. When this happens, the magnetic field locally weakens leading to an asymmetry of the air-gap field. This asymmetry will cause harmonics, which will be expressed as extra losses and mechanical oscillations.
Design of Double-drive Mechanism for Energy Saving Lifting Permanent Magnet
Permanent Magnet Ding Ning*, Liu Chao, Duan Jingsong, and Jiang Shuna Mechanical and Vehicle Engineering College, Changchun University, Changchun 130022, China Abstract: On account of great power consume of lifting electromagnet, energy-saving lifting permanent magnet has got more attention. But in the exiting design of lifting magnet, most can ...
Design of a Continuously Varying Electro-Permanent Magnet …
The most common adhesion mechanism used in mobile robots, which are used for inspection tasks in ferromagnetic structures, is the magnetic adhesion mechanism. Magnetic adhesion can be produced by Permanent Magnets (PMs) or Electro-Magnets (EMs). Both of them have intrinsic limitations such as: a fixed magnetic force for PMs or the need of a constant …