The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
High torque density at low speed is one of the main characteristics of applications such as wind turbines and traction systems. Permanent magnet transverse flux machines exhibit this features owing to their high-energy magnetic flux, which is normal to current and motion vector. The machine's specific geometry magnifies cogging torque that further increases torque ripple, noise, and mechanical vibrations...
This paper describes the causes of cogging torque in Permanent Magnet synchronous Motor. Establishes a motor model by ANSOFT software, uses Finite Element Method to quantitative analysis and comparative peak cogging torque and torque with notches at different locations, and different number of auxiliary slot. The conclusion is that notch reasonable can reduce the cogging torque of permanent magnet...
A dual-rotor axial field flux-switching permanent magnet (DRAFFSPM) machine is proposed and investigated in this paper. The static characteristics, such as the field distribution, the PM flux-linkage, the back-EMF, and the cogging torque, etc., are investigated based on the 3D finite element (FE) method. In order to gain sinusoidal back-EMF and reduce the cogging torque, the structure of the DRAFFSPM...
This paper proposes a new axial flux permanent magnet (AFPM) motor, whose stator is composed of laminated steel and soft magnetic composite (SMC) material. Axial flux machines are considered a preferred solution compared to radial flux machines for electric vehicles and traction applications because of its high torque density and thin disk-shaped structure. However, the manufacturing cost of axial...
This paper deals with the optimization of a single side Axial Flux Permanent Magnet machine (AFPMM) designs with respect to cogging torque. Although the AFPMMs run generally at high speed and high torque, these machines may run at lower operational speed for aircraft applications. At lower operational speed, the cogging torque is an undesirable effect. Firstly, a reference AFPMM is designed with Finite...
Permanent magnet (PM) machines have been widely applied over the past few decades, such as renewable power generation, electric vehicles, domestic appliances, etc.
Provided with the reduction of the cogging torque by skewing slots and simultaneously the decent output performance, an analysis of a permanent magnet synchronous generator (PMSG) is proposed in this paper. Firstly, the best skewing angle with the lowest cogging torque is found and validated with the finite element method (FEM) software, ANSYS/Maxwell. To overcome the repellence of the cogging torque...
In this paper, the design and analysis of a modified outer rotor PMA has been presented, which increases the efficiency and machine capacity by minimizing the cogging torque. The modified outer rotor type PMA will be suitable for extremely low-speed wind turbine based power generation system. The performances of the machine are analyzed by simulation using ANSOFT MAXWEL software, and the results are...
In this paper, the cogging torque in coaxial planetary magnetic gear (CPMG) is investigated. The known method for estimation the cogging torque fundamental frequency in permanent magnet synchronous machines is adapted to the double-rotor structure of the CPMG. The work shows how various design parameters affects the fundamental frequency of cogging torque. Particular attention is given to the relation...
This paper presents a double-stator permanent magnet brushless DC machine (DS-PMBLDC) which is proposed to be used in light electric vehicles and to replace a typical motor for electric vehicles in future. However, to fulfill the limitation of motor performance at different conditions, electric vehicles require their own specific motor design. Thus, a modular type of motor which can easily replace...
Cogging torque is a common design issue in Permanent Magnet Synchronous Machines (PMSMs). Altering the magnet shape is one of the solutions in reducing the cogging torque. This paper addresses the variation in the rotor magnet pole arc which would affect the cogging torque of the external rotor permanent magnet synchronous motor (ERPMSM). Analytical calculations to design a three-phase, 12slot/8pole...
Transverse flux machines can be a torque dense solution for applications requiring a relatively low speed such as electrically assisted bicycles or scooters. Common drawbacks include a high torque ripple caused by a high cogging torque and high back electromotive force harmonics. Cogging torque is of particular importance as it can be felt even when the system is disengaged and the bicycle is being...
This paper presents a method of reducing the cogging torque of transverse flux machines by shaping the poles of the rotor. A number of different techniques are presented and simulated. These simulations are verified by the construction of a number of rotors from which measured results have been obtained. Further to this, the rotors are applied to machines with different cogging torque reduction techniques...
This paper proposes a rotor tooth shaping method to reduce the cogging torque of an axial flux-switching permanent magnet machine. The rotor tooth is shaped in different configurations, including constant, trapezoidal, asymmetrical, extended, and square shapes. 3-D finite element analysis is performed to compare the proposed shapes of rotor tooth. Peak-to-peak cogging torque, fundamental flux linkage,...
Recently, outer-rotor electric machine become a research attention to be applied for in-wheel motor either in electric or hybrid electric vehicles (EVs). Among the competitor for in-wheel machines, the permanent magnet synchronous machine (PMSMs) with an outer-rotor have been used widely due to their high performances in terms of torque ad power. However, there is drawback cause by demagnetization...
The paper presents the concept and results of simulation and experimental research of a claw pole generator with hybrid excitation. Hybrid excitation is performed with a conventional coil located between two parts of the claw-shape rotor and additional permanent magnets which are placed on claw poles. Within the research first a simulation and next constructed experimental model has been developed...
Radial flux PMBLDC motors are designed using CAD program. CAD program gives dimensions and performance of the motor and compared with finite element analysis result to validate the design. Radial flux PMBLDC motor having only one major disadvantage that is cogging torque. Cogging torque cause due to interaction between magnet and stator teeth that lead to noise and vibration in motor. In this paper...
The outer rotor radial flux permanent magnet alternator (PMA) is more suitable for low-speed applications than axial flux or inner rotor radial flux PMA. With the reduction of rotational speed the cogging torque and ripple torque magnitude increases significantly which is known as pulsating torque. The increment of these torque factors superimpose on generated torque thereby degrading the quality...
The outer rotor permanent magnet alternator is unrivaled for low-speed wind turbine frameworks because of it's robust structure, low maintenance and construction cost while the inner rotor permanent magnet alternators are most economically accessible for its customary auxiliary setup. In this research, a comparative study of design and performance analysis between an inner rotor PMA and an outer rotor...
A Permanent Magnet Synchronous Generator (PMSG), part of a wind turbine, has a function to convert mechanical energy into electrical energy. To rotate the first cycle, the generator is blocked by an opponent torque called detent torque/unload torque or cogging torque. This study aim to reduce the cogging torque, modifying teeth formation on the surface of stator teeth. Simulation of the model used...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.