High Torque Density Permanent Magnet Brake

Abstract As the braking device of the aircraft electromechanical actuation system, the brake is a vital link in the aircraft attitude change or function adjustment. Among them, the permanent magnet brake has attracted extensive attention in the field of aerospace technology because of its advantages of low energy consumption and high reliability. At present, the domestic permanent magnet brake is heavy and the braking torque density is generally low, which limits its further development in the field of aerospace. In order to improve the braking torque density of permanent magnet brake, this paper proposes a research method of high torque density permanent magnet brake is proposed. By establishing the magnetic circuit structure of the permanent magnet brake, the relationship between the external characteristics of the permanent magnet brake and the design parameters is determined, and then the performance parameters of the permanent magnet brake are simulated and verified by using the finite element simulation software. Finally, through the physical test, the results show that this method can effectively improve the braking torque density.

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Design and Experimental Validation for Direct-Drive Fault-Tolerant Permanent-Magnet Vernier Machines

The Scientific World JOURNAL ◽

10.1155/2014/241085 ◽

2014 ◽

Vol 2014 ◽

pp. 1-9 ◽

Cited By ~ 3

Author(s):

Guohai Liu ◽

Junqin Yang ◽

Ming Chen ◽

Qian Chen

Keyword(s):

Permanent Magnet ◽

Experimental Validation ◽

Fault Tolerant ◽

Design Method ◽

High Reliability ◽

Direct Drive ◽

Torque Density ◽

Time Stepping ◽

Flux Modulation ◽

High Torque

A fault-tolerant permanent-magnet vernier (FT-PMV) machine is designed for direct-drive applications, incorporating the merits of high torque density and high reliability. Based on the so-called magnetic gearing effect, PMV machines have the ability of high torque density by introducing the flux-modulation poles (FMPs). This paper investigates the fault-tolerant characteristic of PMV machines and provides a design method, which is able to not only meet the fault-tolerant requirements but also keep the ability of high torque density. The operation principle of the proposed machine has been analyzed. The design process and optimization are presented specifically, such as the combination of slots and poles, the winding distribution, and the dimensions of PMs and teeth. By using the time-stepping finite element method (TS-FEM), the machine performances are evaluated. Finally, the FT-PMV machine is manufactured, and the experimental results are presented to validate the theoretical analysis.

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Study and design of dual stator permanent magnet machine with spoke-type configurations using phase-group concentrated-coil windings

International Journal of Applied Electromagnetics and Mechanics ◽

10.3233/jae-209457 ◽

2020 ◽

Vol 64 (1-4) ◽

pp. 1381-1389

Author(s):

Dezhi Chen ◽

Chengwu Diao ◽

Zhiyu Feng ◽

Shichong Zhang ◽

Wenliang Zhao

Keyword(s):

Permanent Magnet ◽

Permanent Magnets ◽

Low Cost ◽

Dynamic Performance ◽

Torque Ripple ◽

Permanent Magnet Machine ◽

Torque Density ◽

Phase Group ◽

High Torque ◽

Simulation Results

In this paper, a novel dual-stator permanent magnet machine (DsPmSynM) with low cost and high torque density is designed. The winding part of the DsPmSynM adopts phase-group concentrated-coil windings, and the permanent magnets are arranged by spoke-type. Firstly, the winding structure reduces the amount of copper at the end of the winding. Secondly, the electromagnetic torque ripple of DsPmSynM is suppressed by reducing the cogging torque. Furthermore, the dynamic performance of DsPmSynM is studied. Finally, the experimental results are compared with the simulation results.

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

Energies ◽

10.3390/en14123639 ◽

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.

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