r l load circuit with a back emf
Thiết kế bộ chỉnh lưu cầu ba pha tải r l e , điện áp một chiều ud = 110 v ,công xuất một chiều pd = 5 kw , ed = 50 v
Ngày tải lên :
24/04/2016, 16:41
... chế l ợng đ a tải Khi dùng van điôt sẽ không có mạch này Tùy thuộc van sử dụng mà các chỉnh l u được phân thành ba loại sau: • • • Nếu các van đều là thyristor thì gọi là ... điện a p rat hay đổi làm dòng tải biến thiên, vì vậy sụt a p nội trở sẽ thay đổi và tác động trở lại điện a p Dòng tải thay đổi làm điện trở dây dẫn thay đổi Vì vậy cả ... chịu a nh hưởng cu a nhiệt độ: tụ ho a, điện trở và nhất là các linh kiện bán dẫn điôt, transistor, thyristor…Đê a m bảo bộ chỉnh l u hoạt động tin cậy và l u dài phải tính...
- 26
- 2.6K
- 34
AN1160 sensorless BLDC control with back EMF filtering using a majority function
Ngày tải lên :
11/01/2016, 16:47
... Figure FIGURE 5: BEMF VOLTAGE COMPARED TO A VIRTUAL NEUTRAL POINT VBUS FIGURE 4: BEMF VOLTAGE COMPARED TO VBUS/2 A VBUS Back- EMF RR A RR Back- EMF C GND RR B + _ Virtual Neutral GND C To ADC B ... Array Value [N] = N Second Half: Array Value [N] = N – 32 DS01160B-page AN1160 TABLE 2: ARRAY VALUES Array Index [N] Array Value Array Index [N] Array Value 0 32 33 2 34 35 36 10 37 10 ... first 32 numbers are the index number multiplied by two • The last 32 values are the index number minus 32, then multiplied by two EQUATION 4: CALCULATING ARRAY VALUES First Half: Array Value...
- 24
- 411
- 0
Báo cáo y học: " Evaluation of Lumbar Facet Joint Nerve Blocks in Managing Chronic Low Back Pain: A Randomized, Double-Blind, Controlled Trial with a 2-Year Follow-U"
Ngày tải lên :
26/10/2012, 09:07
... for low -back pain and sciatica: A systematic review of randomized clinical trials Pain 1995; 63: 279-88 Birkenmaier C, Veihelmann A, Trouillier HH, et al Medial branch blocks versus pericapsular ... with or without Sarapin w Group II = bupi ivacaine and ster roids with or with hout Sarapin Table The erapeutic proce edural characte eristics over a period of ye with avera relief per procedure ... Sensitivity analysis was performed utilizing best case, worst case, and last follow-up scores scenarios Figure illustrates the participant flow Recruitment Baseline Data Demographic characteristics are...
- 12
- 669
- 0
Tài liệu CA L C U L U S E A R LY T R A N S C E N D E N TA L S SIXTH EDITION JAMES STEWART McMASTER pptx
Ngày tải lên :
13/12/2013, 08:15
... multivariable Maple art; COMAP for permission to use project material; George Bergman, David Bleecker, Dan Clegg, Victor Kaftal, Anthony Lam, Jamie Lawson, Ira Rosenholtz, Paul Sally, Lowell ... Smylie, and Larry Wallen for ideas for exercises; Dan Drucker for the roller derby project; Thomas Banchoff, Tom Farmer, Fred Gass, John Ramsay, Larry Riddle, and Philip Strafn for ideas for projects; ... goal through the Rule of Three: Topics should be presented geometrically, numerically, and algebraically. Visualization, numerical and graphical experimentation, and other approaches have changed...
- 1.3K
- 1.2K
- 23
Direct torque control of brushless DC motor with non sinusoidal back EMF
Ngày tải lên :
03/01/2014, 19:44
... generate constant torque APPENDIX SPECIFICATIONS AND PARAMETERS OF THE BLDC MOTOR Value Symbol Quantity P VLL Jpk Irated T,,ted L, M l lll ll ll | || l l ll lX l ll lll R, f Number of poles Maximum ... under 1.2 N m load with non-ideal trapezoidal back- EMF ,1 (reference torque is 1.225 N m) (a) the back- EMF is not ideally trapezoidal considering only the - 5 5r trapezoidal back- EMF Reference torque ... uncontrolled open-loop stator flux linkage locus when N m and 1.2835 N m load torque are applied to the BLDC motor with ideal trapezoidal back- EMF, respectively Steady-state speed control is performed...
- 7
- 455
- 3
Direct torque and indirect flux control of brushless DC motor with non sinusoidal back EMF without position sensor
Ngày tải lên :
03/01/2014, 19:45
... reference frame are not constant, therefore current wave shapes require very fast controllers in particular at high speed Classical bandwidth of the controller (such as proportional– integral) ... Where θ x and θ y are electrical rotor position of first and second reference farme, respectively In order to transformation between stationary reference frame and rotor reference frame, relations ... stator flux amplitude indirectly using d–axis current Unlike those for motor with sinusoidal back- EMFs, optimal current references for a nonsinusoidal back- EMF motor (BLDC) in the synchronous reference...
- 5
- 617
- 2
Direct torque control of four switch brushless DC motor with non sinusoidal back EMF
Ngày tải lên :
03/01/2014, 19:46
... its corresponding current, the phase currents are automatically shaped to obtain the desired electromagnetic torque characteristics using (1) When the actual stationary reference frame back- EMF ... observed from the stator flux linkage trajectory that when conventional two-phase four-switch 2H Hc Hall-3 Figure Actual (solid curved line) and ideal (straight dotted line) stator flux linkage trajectories, ... torque generation, there is no easy way to control the stator flux linkage amplitude On the other hand, rotational speed of the stator flux linkage can be easily controlled, therefore fast torque...
- 7
- 616
- 1
Báo cáo khoa học: Complexes of Thermoactinomyces vulgaris R-47 a-amylase 1 and pullulan model oligossacharides provide new insight into the mechanism for recognizing substrates with a-(1,6) glycosidic linkages docx
Ngày tải lên :
16/03/2014, 14:20
... both starch and pullulan as a substrate Structural comparison of the catalytic site between TVAI and other a- amylases Since pullulan with regular repeats of a- (1,6), a- (1,4), and a- (1,4) glycosidic ... Structure of a- amylase with pullulan model ligand A Abe et al Fig Chemical structures of the repeat units of pullulan, P2 and P5 A solid arrow indicates the main hydrolysing site, and a dashed ... cyclodextrins and pullulan at 2.6 A resolution J Mol Biol 287, 907–921 10 Takata H, Kuriki T, Okada S, Takesada Y, Iizuka M, Minamiura N & Imanaka T (1992) Action of neopullulanase Neopullulanase catalyzes...
- 9
- 342
- 0
Báo cáo hóa học: "L∞ -ERROR ANALYSIS FOR A SYSTEM OF QUASIVARIATIONAL INEQUALITIES WITH NONCOERCIVE OPERATORS" potx
Ngày tải lên :
22/06/2014, 21:20
... continuous case L -error analysis We now turn to the L -error analysis For that purpose, we will give two different approaches M Boulbrachene and S Saadi 11 5.1 The contraction approach It stands ... elliptic quasivariational inequalities, International Journal of Mathematics and Mathematical Sciences 2003 (2003), no 24, 1547–1561 [6] P G Ciarlet and P. -A Raviart, Maximum principle and uniform convergence ... Paris, 1978 e e , Impulse Control and Quasivariational Inequalities, Gauthier-Villars, Montrouge, 1984 [2] [3] M Boulbrachene, Pointwise error estimate for a noncoercive system of quasi-variational...
- 13
- 342
- 0
Báo cáo y học: "Saphenous neuropathy in a patient with low back pain" ppt
Ngày tải lên :
10/08/2014, 10:20
... and Rehabilitation Department, Iran University of Medical Sciences, Firoozgar hospital, Tehran, Iran 2Neurology Department, Tehran University of Medical Sciences, Sina Hospital, Tehran, Iran 3Sports ... electromyography in L4 innervated muscles can differentiate between radiculopathy and saphenous neuropathy A thorough physical examination is mandatory in patients with low back pain and uncommon neuropathies ... a patient with low back pain Journal of Brachial Plexus and Peripheral Nerve Injury 2010 5:2 Submit your next manuscript to BioMed Central and take full advantage of: • Convenient online submission...
- 2
- 380
- 0
báo cáo khoa học: " The PTI1-like kinase ZmPti1a from maize (Zea mays L.) co-localizes with callose at the plasma membrane of pollen and facilitates a competitive advantage to the male gametophyte" doc
Ngày tải lên :
12/08/2014, 05:20
... phosphorylate ZmPti 1a in vitro Mutation of single amino acids which are putatively relevant for myristoylation or acylation results in partial nuclear location of ZmPti 1a Partial nuclear targeting ... a mixture of unicellular microspores and bicellular immature pollen were harvested from anthers to dba before their emergence from the flag leaf A mixture of immature and mature pollen was harvested ... at least four independent transgenic lines All plants transformed with a particular construct revealed identical results ZmPti 1a: GFP and Myr:GFP localize to the pollen plasma membrane (Fig 6A, ...
- 22
- 321
- 0
Báo cáo y học: "Psychosocial factors and their predictive value in chiropractic patients with low back pain: a prospective inception cohort study" docx
Ngày tải lên :
13/08/2014, 14:20
... sessions JL carried out all data entry Both authors participated in the analysis of data JL wrote the first draft of the manuscript Both authors read and approved the final manuscript Acknowledgements ... disseminating the results of biomedical researc h in our lifetime." Sir Paul Nurse, Cancer Research UK Your research papers will be: available free of charge to the entire biomedical community peer reviewed ... was conducted with a grant from the European Chiropractors' Union Research Fund (Grant no A. 04-2.) We are grateful to Nigel Hunt and Jennifer Casemore, chiropractors at the Salisbury Chiropractic...
- 7
- 286
- 0
Báo cáo y học: "The Nordic maintenance care program – case management of chiropractic patients with low back pain: A survey of Swedish chiropractors" doc
Ngày tải lên :
13/08/2014, 14:20
... the largest prevalence of preferred management strategy for each case scenario ranged from 25% to 59% A closer look at the various preferred management strategies for the nine case scenarios told ... disseminating the results of biomedical researc h in our lifetime." Sir Paul Nurse, Cancer Research UK Your research papers will be: available free of charge to the entire biomedical community peer reviewed ... to that which the research team, arbitrarily, considered to be logical and responsible However, also other patterns were apparent, sometimes favouring a prolonged management program, either symptom-guided...
- 7
- 198
- 0
Báo cáo y học: "The Nordic back pain subpopulation program: Can low back pain patterns be predicted from the first consultation with a chiropractor" ppt
Ngày tải lên :
13/08/2014, 14:20
... Fisher’s exact test or regression analysis with one explanatory variable Thereafter, the variables that were associated with one of the outcome variables were considered for a multivariable analysis, ... weeks Data analysis Agreement regarding the diagnostic classes was evaluated both as agreement regarding the main diagnostic class (level 1) and in relation to all chosen classes (level 2) Table ... The authors gratefully acknowledge The Foundation for Chiropractic Education and Research for financial support We also owe the participating chiropractors Susanne Bach Helgeson, Anja Borgaard...
- 8
- 293
- 0
Báo cáo y học: " Mapping the potential distribution of high artemisinin-yielding Artemisia annua L. (Qinghao) in China with a geographic information system" ppsx
Ngày tải lên :
13/08/2014, 15:21
... March; ATAP: average temperature in April; ATMA: average temperature in May; ATJ: average temperature in June; ATJU: average temperature in July; ATA: average temperature in August; AAT: average ... temperature in April (°C) ATAP Average temperature in May (°C) ATMA Average temperature in June (°C) ATJ Average temperature in July (°C) ATJU Average temperature in August (°C) ATA Average Annual ... factors used in this study Category Variables Abbreviation Climate Average temperature in January (°C) ATJA Average temperature in February (°C) ATF Average temperature in March (°C) ATM Average...
- 8
- 342
- 0