Design and fabrication of rotor lateral shifting in the axial-flux permanent-magnet generator

<p>The development of axial-flux permanent-magnet (AFPM) machines has become a mature technology. The single-stator double-rotor (SSDR) AFPM structure has advantages on the compactness and the low up to medium power applications so the microscale size and low-cost applications are reachable to be designed. The research main objectives are designing and manufacturing the lateral shifting from the north poles of the first rotor face the north poles of the second rotor (NN) to the north poles of the first rotor face the south poles of the second rotor (NS) categories as well as finding the best performance of the proposed method and implementing in a low cost and micro-scale AFPMG. The novel lateral shifting on the one of the rotors shows performance at 19.2⁰ has the highest efficiency at 88.39% during lateral shifting from N–N (0⁰) to N–S (36⁰) on rotor₂.</p>

A prototype of 3D-printed permanent magnet generator for low power applications

Recently, there has been a growing interest in the field of using 3D-printing technology for electrical machine manufacturing. However, almost research works have been done majorly on the 3D-printing technology of individual working parts for various electrical machines. This research presents a study of design, fabrication and testing of the protopype of permanent magnet generator using 3D-printing technology. The major parts of proposed generator are fabricated though 3D-printed materials. The stator winding of designed generator consists of 12 slots. The stator coil is designed to have 250 turns per slot and 12 pieces of neodymium magnets are used in to generate magnetic field in the rotor core. The prototype generator is tested under different condition; no-load and loaded-test. The experimental have been shown that in the no-load condition, this generator is able to generate output voltage of 3.3-64.5 V, when rotated at speed of 100-2,500 rpm. In the loaded-test, the output voltage and output current are also generated. Furthermore, it can be seen that a proposed generator can generate the output power of 4,245.28 mW, when rotated at speed of 2,500 rpm.

Geometrical and dimensional tolerance analysis for the radial flux type of permanent magnet generator design

Mechanical tolerance is something that should be carefully taken into consideration and cannot be avoided in a product for manufacturing and assembly needs, especially in the design stage, to avoid excessive dimensional and geometric deviations of the components made. This paper discusses how to determine and allocate dimensional and geometric tolerances in the design of a 10 kW, 500 rpm radial flux permanent magnet generator prototype components. The electrical and mechanical design results in the form of the detailed nominal dimensions of the generator components, and the allowable air gap range are used as input parameters for tolerance analysis. The values of tolerance allocation and re-allocation process are carried out by considering the capability of the production machine and the ease level of the manufacturing process. The tolerance stack-up analysis method based on the worst case (WC) scenario is used to determine the cumulative effect on the air gap distance due to the allocated tolerance and to ensure that the cumulative effect is acceptable so as to guarantee the generator's functionality. The calculations and simulations results show that with an air gap of 1 ± 0.2 mm, the maximum air gap value obtained is 1.1785 mm, and the minimum is 0.8 mm. The smallest tolerance value allocation is 1 µm on the shaft precisely on the FSBS/SRBS feature and the rotor on the RPMS feature. In addition, the manufacturing process required to achieve the smallest tolerance allocation value is grinding, lapping, and polishing processes.

Analysis of the Rotor Magnetomotive Force of Built-In Radial Permanent Magnet Generator for Vehicle

Permanent magnet generator (PMG) for vehicles has attracted more and more attention because of its high efficiency, high power density, and high reliability. However, the weak main air-gap magnetic field can affect the output performance and the normal use of electrical equipment. Aiming at the problem, this paper took the rotor magnetomotive force (MMF), the direct influencing parameter of the main air-gap magnetic field, as the research object, deduced the analytical expression of rotor MMF of the built-in radial PMG in detail, and analyzed its main influencing factors in analytical expression, including the permanent magnet steel (PMS) material, the thickness of PMS in magnetizing direction, the vertical length of the inner side of PMS, and the effective calculation length of PMS. Based on this, the rotor parameters were optimized to obtain the best values. After that, the finite element simulation and prototype test of the optimized generator were carried out. The comparative analysis results showed that the optimized rotor parameters could effectively improve the rotor MMF and optimize the output performance of the generator.

NÂNG CAO CHẤT LƯỢNG ĐIỀU KHIỂN HỆ TRUYỀN ĐỘNG ĐIỆN GIÓ TRÊN CƠ SỞ BỘ ĐIỀU KHIỂN THÔNG MINH SỬ DỤNG MÁY PHÁT ĐIỆN BLDCG

Bài báo này trình bày nghiên cứu nâng cao chất lượng điều khiển cho hệ thống truyền động điện gió, trên cơ sở bộ điều khiển thông minh sử dụng máy phát điện nam châm vĩnh cửu một chiều không chổi than (BLDCG: Brushless DC Permanent Magnet Generator). Nhằm ứng dụng cho hệ thống điện gió công suất nhỏ, trên cơ sở điều khiển thông minh trượt thích nghi và mạng nơron có tính đến bộ ước lượng mômen ma sát nhiễu phi tuyến. Kết quả nghiên cứu trên phần mềm PSCAD và Matlab Simulinks cho thấy, phương pháp điều khiển không chỉ có tác dụng bù yếu tố phi tuyến (mômen nhiễu tổng hợp: mômen ma sát, mômen cản) tốt hơn mà còn có khả năng chống nhiễu tốt hơn, giúp cho hệ thống truyền động điện gió có trạng thái ổn định và đem lại được hiệu suất cao. Hơn nữa, việc sử dụng năng lượng gió sẵn có sẽ tốt hơn, đặc biệt là trong khi tốc độ gió thấp hệ thống vẫn làm việc ổn định.