Analysis and determination of cogging torque and unbalanced magnetic forces in permanent magnet spindle motors for hard disk drives

... the electromagnetic forces are extremely stringent Electromagnetic forces such as the cogging torque and unbalanced magnetic pull (UMP) generated in the permanent magnet spindles are of great concerns ... Modeling and Analysis of PM Brushless DC Motors 2.1 Electromagnetic Field in PM Brushless DC Motors In order to study the electromagnetic forces and t...

Ngày tải lên: 15/09/2015, 22:03

... ROBUST DESIGN OF MINIATURISED SPINDLE MOTORS FOR HARD DISK DRIVE GAO XIAN KE (M.Eng, B.Eng) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY DEPARTMENT OF ELECTRICAL AND ... application of robust design in hard disk drive industry As the objective of the research is to formulate effective robust design approaches systematically for the...

Ngày tải lên: 17/09/2015, 17:20

... Torque performance of SVM based DTC and Current Control for a wide speed operation 169 6.26 Power performance of SVM based DTC and Current Control for a wide speed operation ... Control of IPMSM in Wide Speed Operation 24 Outline of the Thesis 25 Analysis of Interior Permanent Magnet Synchronous Motors for Wide- Speed Operation ... pr...

Ngày tải lên: 15/09/2015, 22:06

... capacity and leads to the determination of admission region in the uplink of CDMA systems Our analytical work can be further combined with the call level analysis of QoS performances to provide a joint ... cross-layer CAC in CDMA networks Our contribution is that the analytical formulation in this paper leads to the determination of the crosslayer ad...

Ngày tải lên: 22/06/2014, 22:20

... The development of Permanent Magnet Machines 1.1.2 Features of permanent magnet motors Permanent magnet synchronous motors iii 1.2.1 Structures and operating principles ... with the analysis and design of buried type Interior Permanent Magnet Synchronous Motors (IPMSM) The objective is to develop a design optimization procedure for this type of...

Ngày tải lên: 04/10/2015, 15:45

... throughout the growing season Hydraulic conductance and water loss In figure 2, we represented for one representative drought tree and one control tree the seasonal patterns of the daily water potential/sap ... objective of this paper is to test the hypothesis that sap flow and water losses are regulated during drought according to changes in whole tree...

Ngày tải lên: 08/08/2014, 18:21

... Chapter Introduction The modern information technology consists of three parts: information acquiring, information processing, information transferring and information storage In fact, information ... Exploration of In- Situ Diagnosis Methods for the Evaluation of Mechanical and Magnetic Performance of Hard Disk Drives ZHU JIN （B.Eng (hons) HUST, P....

Ngày tải lên: 05/10/2015, 22:15

... bj ¯ ¯ The ring k[t, σ] contains both the noncommutative ring k[σ] and the commu¯ as subrings The ring Fq [t] is contained in the center of the ring tative ring k[t] ¯ ¯ k[t, σ] The ring k[t, ... ((1/T )) = the | · |∞ -completion of k an algebraic closure of k∞ the | · |∞ -completion of k∞ the algebraic closure of k in C∞ ¯ a fixed choice in k of a (q...

Ngày tải lên: 22/03/2014, 16:20

... at a low concentration and at a few sampling locations Table Concentration of the analyzed pharmaceutical compounds in surface water samples collected at Hồ Chí Minh City Sampling site River/Canal ... locations Particularly, ibuprofen concentration at Lê Văn Sỹ bridge is significantly higher than at other locations Regarding ketoprofen and diclofenac sodium, they only ex...

Ngày tải lên: 24/06/2015, 08:16

... effects on HIF-1a during cyclic hypoxia; caution is therefore required in the use of NOS inhibitors as single anti-tumor treatments More generally, by providing new insights into the regulation of HIF-1a ... to cyclic hypoxia despite degradation during reoxygenation We examined the impact of three cycles of h hypoxia ⁄ 30 reoxygenation (versus 1, and h of...

Ngày tải lên: 30/03/2014, 02:20

... attached to Thr3 enhances binding affinity of glycopeptides to the antibody [18] Conventional pepscan analysis however, does not allow easy analysis of the contribution of the carbohydrate portion To ... TSAPDTRPAPGST and the antibody SM3 was determined by Dokurno et al [19] They report a significant contribution of Arg4 to binding by analyzing the su...

Ngày tải lên: 21/02/2014, 15:20

... one of the models under analysis (model 5) at final crack propagation 6.1.3 Calculation of the Stress Intensity Factors When a propagating crack is considered, the stress intensity factors and ... Effect of Crack Increment on SIF, Toe Crack crack) on the stress intensity factor (KI) under a constant load The applied edge stress for the model was based on...

Ngày tải lên: 24/05/2014, 20:40

... Reference gene selection for quantitative real- time PCR analysis in virus infected cells: SARS corona virus, Yellow fever virus, Human Herpesvirus-6, Camelpox virus and Cytomegalovirus infections Virol ... of cell types infected with a variety of strains of HIV-1, HSV-1, VZV and cytomegalovirus (CMV) compared to mock infected cells Results A range of...

Ngày tải lên: 18/06/2014, 18:20

... Reference gene selection for quantitative real- time PCR analysis in virus infected cells: SARS corona virus, Yellow fever virus, Human Herpesvirus-6, Camelpox virus and Cytomegalovirus infections Virol ... of cell types infected with a variety of strains of HIV-1, HSV-1, VZV and cytomegalovirus (CMV) compared to mock infected cells Results A range of...

Ngày tải lên: 20/06/2014, 01:20

... cell culture on the fidelity of replication of HCV We tested the impact of long-term in vitro culturing on CIMM-HCV sequences Samples of PCLB-T4a and PCLBT4b, which had been cultured for months and ... that HCV infects these cells as well, and are produced by them However, it is unknown whether the macrophages are modifying or selecting the HCV to make them more in...

Ngày tải lên: 20/06/2014, 02:20