Performance comparison of dual-rotor radial-flux and axial-flux permanent-magnet BLDC machines

2003 ◽  
Author(s):  
Ronghai Qu ◽  
M. Aydin ◽  
T.A. Lipo
Keyword(s):  
Permanent Magnet ◽  
Performance Comparison ◽  
Axial Flux ◽  
Radial Flux

scholarly journals Design and Analysis of a Novel Axial-Radial Flux Permanent Magnet Machine with Halbach-Array Permanent Magnets

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3639
Author(s):  
Rundong Huang ◽  
Chunhua Liu ◽  
Zaixin Song ◽  
Hang Zhao
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnets ◽  
Torque Ripple ◽  
Axial Flux ◽  
Element Analysis ◽  
Torque Density ◽  
Axial Forces ◽  
Halbach Array ◽  
Radial Flux ◽  
High Torque

Electric machines with high torque density are needed in many applications, such as electric vehicles, electric robotics, electric ships, electric aircraft, etc. and they can avoid planetary gears thus reducing manufacturing costs. This paper presents a novel axial-radial flux permanent magnet (ARFPM) machine with high torque density. The proposed ARFPM machine integrates both axial-flux and radial-flux machine topologies in a compact space, which effectively improves the copper utilization of the machine. First, the radial rotor can balance the large axial forces on axial rotors and prevent them from deforming due to the forces. On the other hand, the machine adopts Halbach-array permanent magnets (PMs) on the rotors to suppress air-gap flux density harmonics. Also, the Halbach-array PMs can reduce the total attracted force on axial rotors. The operational principle of the ARFPM machine was investigated and analyzed. Then, 3D finite-element analysis (FEA) was conducted to show the merits of the ARFPM machine. Demonstration results with different parameters are compared to obtain an optimal structure. These indicated that the proposed ARFPM machine with Halbach-array PMs can achieve a more sinusoidal back electromotive force (EMF). In addition, a comparative analysis was conducted for the proposed ARFPM machine. The machine was compared with a conventional axial-flux permanent magnet (AFPM) machine and a radial-flux permanent magnet (RFPM) machine based on the same dimensions. This showed that the proposed ARFPM machine had the highest torque density and relatively small torque ripple.

Performance Comparison of AFDS PMSG during Voltage Regulation by mechanical field-weakening in Extended-Speed-Range

2019 ◽  
Vol 13 ◽  
Author(s):  
Shailendra Kumar Gupta ◽  
Rakesh Kumar Srivastava
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnets ◽  
Voltage Regulation ◽  
Performance Comparison ◽  
High Coercivity ◽  
Axial Flux ◽  
Field Weakening ◽  
Mechanical Field ◽  
Mechanical Methods ◽  
Speed Range

: Axial-flux permanent magnet generators have been found suitable in wind energy conversion system and electrical vehicle owing to its compactness, high torque to inertia ratio, modular geometry, and high magnet usability index. Such applications require the generator to operate in extended speed range. In extended speed range, voltage regulation of the generator is achieved by field-weakening of the generator. Usually, field-weakening is achieved by injecting negative d-axis current in the armature winding of the generator. However, in the axial-flux machine field-weakening by current injection is not substantial due to the low inductance of the machine and use of permanent magnets with high coercivity. Therefore, this paper emphasizes field-weakening using mechanical methods. This paper compares the performance of different axial-flux dual-stator permanent magnet generator (AFDS PMG) topologies on the basis of voltage regulation by mechanical-field-weakening-technique. Field-weakening in the generator is achieved by angularly displacing one of the stators with respect to other via a mechanical actuator. Experimental test results on proof-of-concept generators have been presented to conclude that AFDS PMSG with perfect sinusoidal back-emf characteristic is best suited for mechanical field-weakening-based voltage regulation in ESR.

Application of Soft Magnetic Composite Material in the Field of Electrical Machines

2013 ◽  
Vol 380-384 ◽  
pp. 4299-4302
Author(s):  
Xiao Bei Li ◽  
Jing Zhao ◽  
Zhen Chen
Keyword(s):  
Permanent Magnet ◽  
High Speed ◽  
Electric Machine ◽  
Magnetic Composite ◽  
Applied Potential ◽  
Soft Magnetic ◽  
Axial Flux ◽  
Permanent Magnet Machine ◽  
Soft Magnetic Composite ◽  
Radial Flux

The property of the soft magnetic composite (SMC) material is introduced. Take the traditional material used for electric machine, i.e. the silicon steel lamination, as the reference, this paper summarizes the application advantages of SMC in the typical electric machine, such as tubular permanent-magnet liner machine, high-speed permanent-magnet machine, claw-pole machine, axial flux permanent-magnet machine and radial flux permanent-magnet machine. SMC material has much applied potential in the field of electric machine.

Design and simulation of disk stepper motor with permanent magnets

2013 ◽  
Vol 62 (2) ◽  
pp. 281-288 ◽  
Author(s):  
Ján Kaňuch ◽  
Želmíra Ferková
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnets ◽  
Stepper Motor ◽  
Fem Modeling ◽  
Axial Flux ◽  
Torque Density ◽  
Radial Flux ◽  
Type Machine ◽  
High Torque ◽  
Static Simulation

Abstract In this paper the design and the magneto-static simulation of axial-flux permanent- magnet stepper motor with the disc type rotor is presented. Disk motors are particularly suitable for electrical vehicles, robots, valve control, pumps, centrifuges, fans, machine tools and manufacturing. The brushless machine with axial flux and permanent magnets, also called the disc-type machine, is an interesting alternative to its cylindrical radial flux counterpart due to the disk shape, compact construction and high torque density. This paper describes a design of four phase microstepping motor with the disc type rotor. The FEM modeling and the 3D magneto-static simulation of the disk stepper motor with permanent magnets is being subject of the article, too. Disc rotor type permanent magnet stepper motor for high torque to inertia ratio is ideal for robotics and CNC machines.

scholarly journals Design of Slotted and Slotless AFPM Synchronous Generators and their Performance Comparison Analysis by using FEA Method

2015 ◽  
Vol 5 (4) ◽  
pp. 810
Author(s):  
Saint Saint Soe ◽  
Yan Aung Oo
Keyword(s):  
Finite Element ◽  
Permanent Magnet ◽  
Synchronous Generator ◽  
Performance Comparison ◽  
Low Noise ◽  
Machine Design ◽  
Magnetic Flux Density ◽  
Permanent Magnet Machines ◽  
Axial Flux ◽  
Element Analysis

Axial-flux permanent magnet machines are popular and widely used for many applications due to their attractive features such as light weight, low noise, high torque, robust and higher efficiency due to lack of field excitation. The main essence of this paper is to perform slotted and slotless axial-flux permanent magnet synchronous generator design based on theoretical sizing equations and then finite element analysis is reinforcement in order to get a more reliable and accuracy machine design. A comparative study of machine design and performances over the same rating but different configurations i.e., slotted and slotless are also discussed. And then, finite-element method (FEM) software was made for the slotted stator and slotless stator (AFPMSG) in order to compare their magnetic flux density and efficiency. The AFPMSG topology considered in this paper is a three-phase double-rotor single-stator topology with 16 pole-pairs, 2kW rated power and 188 rpm rated speed.

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