Modeling air-core permanent-magnet linear generators in free-rotating devices

2015 ◽  
Author(s):  
Aaron D. Brovont ◽  
Steven D. Pekarek
Keyword(s):  
Permanent Magnet ◽  
Air Core ◽  
Linear Generators

Research on Selection Criterion of Design Tolerance for Air-Core Permanent Magnet Synchronous Linear Motor

2021 ◽  
Vol 68 (4) ◽  
pp. 3336-3347
Author(s):  
Zheng Yao ◽  
Jiwen Zhao ◽  
Juncai Song ◽  
Fei Dong ◽  
Zhongyan He ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
Selection Criterion ◽  
Linear Motor ◽  
Air Core ◽  
Design Tolerance

scholarly journals Design of Permanent-Magnet Linear Generators with Constant-Torque-Angle Control for Wave Power

Energies ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1312 ◽  
Author(s):  
Sandra Eriksson
Keyword(s):  
Permanent Magnet ◽  
Simulation Method ◽  
Design Stage ◽  
Wave Power ◽  
Damping Force ◽  
Important Conclusion ◽  
Constant Torque ◽  
Linear Generators ◽  
Copper Losses ◽  
Torque Angle

This paper presents a simulation method for direct-drive permanent-magnet linear generators designed for wave power. Analytical derivations of power and maximum damping force are performed based on Faraday’s law of induction and circuit equations for constant-torque-angle control. Knowledge of the machine reactance or the load angle is not needed. An aim of the simulation method is to simplify comparison of the maximum damping force, losses, and cost between different generator designs at an early design stage. A parameter study in MATLAB based on the derived equations is performed and the effect of changing different generator parameters is studied. The analytical calculations are verified with finite element method (FEM) simulations and experiments. An important conclusion is that the copper losses and the maximum damping force are mainly dependent on the rated current density and end winding length. The copper losses are inherently large in a slow-moving machine so special consideration should be taken to decrease the end winding length. It is concluded that the design of the generator becomes a trade-off between material cost versus high efficiency and high maximum damping force.

Design and Modeling of a Spherical Actuator with Three Dimensional Orientation Measurement System

2011 ◽  
Vol 317-319 ◽  
pp. 1088-1097 ◽  
Author(s):  
Wei Hai Chen ◽  
Liang Zhang ◽  
Fang Hong Guo ◽  
Jing Meng Liu
Keyword(s):  
Permanent Magnet ◽  
Measurement System ◽  
Three Dimensional ◽  
Design Procedure ◽  
Design Parameters ◽  
Orientation Measurement ◽  
Air Core ◽  
Experimental Works ◽  
High Torque ◽  
Spherical Actuator

This paper presents the design and modeling of a permanent magnet spherical actuator which consists of a rotor with eight cylindrical permanent magnet (PM) poles and a stator with twenty-four air-core coils. Torque and dynamic model of this PM spherical actuator are formulated analytically. An optimal design procedure is proposed to achieve a high torque output, and significant design parameters of the actuator are discussed. As there is no effective method for three dimensional orientation measurement of the spherical actuator currently, a novel orientation measurement system is proposed. Finally, experimental works are carried out, and the experiment results demonstrate the effectiveness of the proposed orientation measurement system.

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