title: Design Methodology of a Dual-Halbach Array Linear Actuator with Thermal-Electromagnetic Coupling.
abstract: This paper proposes a design methodology for linear actuators, considering thermal and electromagnetic coupling with geometrical and temperature constraints, that maximizes force density and minimizes force ripple. The method allows defining an actuator for given specifications in a step-by-step way so that requirements are met and the temperature within the device is maintained under or equal to its maximum allowed for continuous operation. According to the proposed method, the electromagnetic and thermal models are built with quasi-static parametric finite element models. The methodology was successfully applied to the design of a linear cylindrical actuator with a dual quasi-Halbach array of permanent magnets and a moving-coil. The actuator can produce an axial force of 120 N and a stroke of 80 mm. The paper also presents a comparative analysis between results obtained considering only an electromagnetic model and the thermal-electromagnetic coupled model. This comparison shows that the final designs for both cases differ significantly, especially regarding its active volume and its electrical and magnetic loading. Although in this paper the methodology was employed to design a specific actuator, its structure can be used to design a wide range of linear devices if the parametric models are adjusted for each particular actuator.
authors.affiliation: Post-Graduate Program in Electrical Engineering, Federal University of Rio Grande do Sul, Av. Osvaldo Aranha 103, Porto Alegre, RS 90035-190, Brazil. paulo.eckert@ufrgs.br.
authors.forename: Paulo Roberto
authors.initials: PR
authors.lastname: Eckert
authors.affiliation: Post-Graduate Program in Electrical Engineering, Federal University of Rio Grande do Sul, Av. Osvaldo Aranha 103, Porto Alegre, RS 90035-190, Brazil. aly.flores@ufrgs.br.
authors.forename: Aly Ferreira
authors.initials: AF
authors.lastname: Flores Filho
authors.affiliation: Department of Mechanical Engineering, Federal University of Rio Grande do Sul, Rua Sarmento Leite 425, Porto Alegre, RS 90050-170, Brazil. eduardo.perondi@ufrgs.br.
authors.forename: Eduardo
authors.initials: E
authors.lastname: Perondi
authors.affiliation: Department of Mechanical Engineering, Federal University of Rio Grande do Sul, Rua Sarmento Leite 425, Porto Alegre, RS 90050-170, Brazil. jeferson.ferri@ufrgs.br.
authors.forename: Jeferson
authors.initials: J
authors.lastname: Ferri
authors.affiliation: Technology Centre, Federal University of Santa Maria, Av. Roraima 1000, Santa Maria, RS 97105-900, Brazil. evandro@inf.ufsm.br.
authors.forename: Evandro
authors.initials: E
authors.lastname: Goltz
keywords: design methodology; dual quasi-Halbach actuator; linear actuators design; moving-coil actuator; parametric analysis; thermal-electromagnetic coupling; tubular actuators