Abstract: Novel modular stator surface-mounted permanent magnet (SSPM) machines are investigated, which feature E-type stator modular units with surface-mounted permanent magnets (PMs) on central teeth, as well as the tangential flux gaps (FGs) sandwiched by the stator units. The symmetrical sinusoidal phase flux-linkage can be obtained in the machines …
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 ...
This chapter discusses surface-permanent-magnet (SPM) ac motors. While the SPM ac machine is widely used in industrial applications, its sibling, the interior-permanent-magnet (IPM) machine, is the machine of choice for electric powertrains. The chapter provides the necessary background for the investigation of the IPM machine.
This paper proposes a generalized equivalent magnetic circuit model for the design of permanent-magnet (PM) electric machines. Conventional approaches have been applied to PM machine design but may be insufficiently accurate or generalized without taking pole-slot counts into consideration. This would result in reduction of dimensioning accuracy at the initial design …
This paper presents rotor PM shaping design for radial flux inner rotor surface permanent magnet synchronous machines (SPMSM). PMs being shaped according to a sinusoid along the axial direction while the thickness of the magnet is kept uniform along the radial direction. The performance of the machine with sinusoidal shaped rotor PM (Model-B ...
1 A straightforward range of values cannot be suggested since it will depend on the intended generator output power. 2 Found with the PM demagnetization curve after choosing its grade and temperature, and the permeance coefficient. 3 Obtained through magnetostatic FES. 4 Recommended to lead to an integer N C p p. 5 These are conventional suggestions, …
describe three different geometrical arrangements for permanent magnet motors: 1. Surface Mounted Magnets, Conventional Stator, 2. Surface Mounted Magnets, Air-Gap Stator Winding, …
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 magnet synchronous motor …
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 regulate the individual phase …
This article presents an analytical model to predict the performance of eccentric surface-mounted permanent-magnet (ESPM) motor based on the nonlinear conformal mapping and reluctance network hybrid model (NCRHM). The proposed model can reveal the mutual influence of rotor eccentricity on the stator slotting and iron saturation accounting for the …
The rotor magnetic circuit structure of the permanent magnet synchronous motor is different, so the operation characteristics and control system of the motor are also different. According to the different positions of the permanent magnets on the rotor, permanent magnet synchronous motors can be mainly divided into: surface type and interior type.
Surface Permanent Magnets (SPM) Magnets are bonded to the outside surface of a laminated steel rotor that rotates. Therefore, adhesive should be strong enough to resist the centrifugal force. Internal Permanent Magnets …
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 electromechanical ...
Abstract: In this paper, the surface-mounted permanent magnet motor (SPMM) which uses multi-level magnet combination to improve air gap magnetic field distribution is modeled and optimized based on analytical method. The multi-level magnets adopt the specific combination of NdFeB and ferrite with different remanences to reduce the harmonics of the air …
Fractional-slot concentrated windings have been gaining a lot of interest in permanent magnet synchronous machines. This is due to the advantages they provide, including shorter nonoverlapping end turns, higher efficiency, higher power density, higher slot fill factor, lower manufacturing cost, better flux-weakening capability resulting in wider constant power …
In this paper, the surface-mounted permanent magnet motor (SPMM) which uses multi-level magnet combination to improve air gap magnetic field distribution is modeled and optimized …
Mover mesh of one region, 4 slots (x & y are the length and the height of the stack, respectively) at position = 4.5mm with respect to the stator, time = 0.0045 sec from initial position.
Magnetic gears transform power between low-torque, high-speed rotation and high-torque, low-speed rotation using magnetic fields instead of interlocking teeth. This paper uses an extensive parametric finite element analysis study to quantitatively compare the optimal performances of two of the most promising magnetic gear topologies, radial flux coaxial magnetic gears and radial …
This paper introduces a novel dual-air-gap surface permanent magnet synchronous motor (DAG-SPMSM) and investigates its electromagnetic characteristics. The motor comprises two stators (inner and outer) and a …
Abstract: We present an analytical method for the calculation of cogging torque in surface permanent-magnet (PM) motors. The cogging torque is calculated by integrating the Maxwell stress tensor inside the air gap. The principle of complex relative air-gap permeance derived from conformal transformation of the slot geometry is used to take into account the effect of slotting …
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.
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 originating from standstill …
Background Surface permanent magnet motors (SPMVM) and dual permanent magnet motors (DPMVM) have broad prospects in direct drive systems, but there are problems with large magnetic leakage, large ...
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 been …
IEEE TRANSACTIONS ON MAGNETICS, VOL. 45, NO. 7, JULY 2009 2943 Analytical Solution for Electromagnetic Torque in Surface Permanent-Magnet Motors Using Conformal Mapping Damir Žarko1, Drago Ban1, and Thomas A. Lipo2, Fellow, IEEE Faculty of Electrical Engineering and Computing, Department of Electrical Machines, Drives and Automation, …
High dynamic response has always been one of the goals of the surface-mounted permanent magnet synchronous motor (SPMSM) servo system. To this end, this article proposes an antidisturbance enhanced finite-time composite control strategy for the SPMSM servo system. First, a finite-time controller is designed to enhance the rapidity of the SPMSM speed loop. …
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 performance of the optimized motor is …
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 …
This paper presents an analytical approach to calculate the magnetic field distribution in surface-inset permanent magnet motors. A series-slot analytical model is newly proposed to describe the ...
A surface-mounted permanent magnet synchronous motor (SPMSM) is an electric motor with a simple magnetic circuit design, fast responsiveness, linear torque–current …
The title of the article is severely misleading when you claim "Permanent Magnets Explained by Magnetic Surface Currents". This was my objection from the very beginning – the use of that language! Claiming that "permanent magnets explained by magnetic surface currents" means that the origin of this permanent magnet is this surface currents.
Permanent magnet vernier machines (PMVMs) exhibit the feature of high torque density, which makes them a compelling candidate for gearless direct-drive applications, such as electric vehicle (EV) and servo drive. However, the motor suffers from low power factor issue. And the long end winding, caused by overlaps and long spanning distance, significantly reduces the efficiency …
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 comparison between RMGs and …
This study proposes a novel surface permanent magnet synchronous motor (N-SPMSM) structure, which features asymmetric magnets attached to the rotor surface.
This note considers the analysis of a surface-mount permanent magnet motor with a concentrated winding. Although only a few winding schemes are widely used (1/4 or 2/7 slots per pole per phase), a great variety of concentrated windings are possible, as shown in [1]. The present example uses a 3/8 pitch winding with 16 magnets and 18 stator ...
