Liang-Yi Hsu

Efficiency optimization of brushless permanent magnet motors using penalty genetic algorithms

This paper presents an optimal design method to maximize the efficiency of a brushless permanent magnet motor with an exterior rotor for blower system. A genetic algorithm is developed to find the optimal variables based on an objective function for the efficiency of the designed motor where the constraints and independent variables are given analytically with an equivalent magnetic circuit. Using the genetic algorithm and the equivalent magnetic circuit, it is possible to achieve a design to satisfy the desired performance requirements within a reasonable geometry. The finite element analysis is then used to confirm the optimality of the design. Computer simulation results are given to show the effectiveness of the proposed design process that can achieve a good prediction of the motor performance.

Winding Design and Fabrication of a Miniature Axial-Flux Motor by Micro-Electroforming

In downsizing motor drives to fit in increasingly compact electronic products, the winding is the most awkward part to be scaled down from conventional motor design. The micro-electroforming process, however, can form products between micro and millimeter scale and is appropriate for manufacturing special winding conductor profiles. We describe a design for a miniature axial-flux motor based on a micro-electroformed winding. The design uses rhomboidal windings to reduce copper loss. We have verified the design by finite-element analysis, and we fabricated and inspected a prototype to demonstrate the effectiveness of the micro-electroforming procedure.

Winding layout for a miniature axial-flux motor using electroforming technology

This paper uses electroforming technology to implement the winding of a miniature axial-flux motor. Electroforming is a highly specialized process for fabricating a metal part by electro deposition in a plating bath over a base plate. Unlike radial flux motors, whose windings need to be realized using copper wires, electroforming process carries out the three-phase windings directly. Winding arrangement and coil shape are simulated by finite element analysis and designed for better performance. Based the design result and electroforming technology, the copper-electroformed winding is carried out. Proper electroforming parameters, such as density current, concentrations of components of the bath, temperature and so on, were controlled in electroforming process. Briefly, this paper presents a practical reference of winding layout to be considered in miniature axial-flux motor design

Development of an ultraslim permanent magnet brushless motor for microelectronic devices

This paper develops an ultraslim permanent magnet brushless motor with printed circuit board winding, which, in application, is an electromagnetic exciting component. The design of its mechanical structure aims to eliminate any unnecessary space. An effective explanation for calculating the related motor parameters is presented and finite element analysis is also incorporated for further performance evaluation and refinement. Following the design process, a prototype of an ultraslim motor is suggested. A commercially available motor drive integrated circuit has been effectively adapted to make the motor work successfully. Excellent agreement between the simulation and measured results shows that the ultraslim motor may be suitable for microelectronic products.