NDLI: Maximisation of power density in permanent magnet machines with the aid of optimisation algorithms

Content Provider	IET Digital Library
Author	Cupertino, Francesco Leuzzi, Riccardo Monopoli, Vito Giuseppe Cascella, Giuseppe Leonardo
Abstract	This study considers the design of surface-mounted permanent magnet electrical machines for high-speed applications and proposes a methodology to determine the maximum achievable power density. Power density is usually improved by increasing rotational speed. At high speed, a mechanical retaining system for the rotor magnets must be considered. As the speed increases, the thickness of the retaining sleeve becomes larger, reducing torque capability. There will be an optimal speed at which the output power will be maximised. Both structural and electromagnetic design must be considered simultaneously to properly address this design problem. To simplify the design procedure, static finite-element simulations are used for the electromagnetic analysis and analytical formulae are employed for retaining sleeve sizing. The procedure is aided by multi-objective optimisation algorithms. A case study based on the specification of an aeronautical actuator is presented. The performances that can be obtained using different iron cores, high-grade silicon steel, and cobalt iron steel are compared. Finally, results obtained from transient finite-element electromagnetic and structural analysis are presented to validate the feasibility of the proposed procedure.
Starting Page	1067
Ending Page	1074
Page Count	8
ISSN	17518660
Volume Number	12
e-ISSN	17518679
Issue Number	Issue 8, Sep (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-epa/12/8
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-epa.2017.0874
Journal	IET Electric Power Applications
Publisher Date	2018-04-17
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	A.C. Machine Aeronautical Actuator Cobalt Alloys Cobalt Iron Steel CoFe D.C. Machines Electromagnetic Actuators Electromagnetic Analysis Electromagnetic Design Electromagnets Finite Element Analysis Finite-element Simulations High-grade Silicon Steel High-speed Application Iron Alloy Iron Cores Maximum Achievable Power Density Mechanical Retaining System Microactuators Multiobjective Optimisation Algorithm Optimal Speed Optimisation Optimisation Technique Permanent Magnet Machine Rotational Speed Rotor Magnets Rotors Silicon Sleeve Sizing Structural Design Surface-mounted Permanent Magnet Electrical Machine Torque Torque Capability
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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