a servo motor with a potentiometer
Direct torque control of brushless DC motor with non sinusoidal back EMF
Ngày tải lên :
03/01/2014, 19:44
... that of ation, toril da d becaseao bius lhsepolm re bcauseof teReference a hefa-axisdstatorc(b flux ol hanges at everyncmmutaation ptaoints an curve shap a n v g Tiplitabe is betwee theng han afluaxei ... Hall-3 and inductance, respectively, the a, B-axes rotor flux linkages qJrac and Ypr/ are obtained by taking the integral of both sides of Fig Actual and ideal (dashed-line) stator flux linkage ... especially the phase inductance, motor speed, snubber circuit, and the amount of load torque If a BLDC motor has an ideal trapezoidal back-EMF having a 120 electrical degree flat top, one current...
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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
... sβ (8) If sampling period is significantly less than electrical and mechanical time constant then back-EMF value can be assumed to remain constant During each sampling period and so: deα / ... (1) and (4) qand d-axis flux linkage are drived Also, by usig (4) qand d-axis current are calculated Finally, by using (6) electromagnetic torque is estimated A look-up table for the three-phase ... 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) does not allow...
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Direct torque control of four switch brushless DC motor with non sinusoidal back EMF
Ngày tải lên :
03/01/2014, 19:46
... openphase back-EMF causes each straight side of the ideal hexagonal shape of the stator flux linkage locus to be curved and the actual stator flux linkage trajectory tends to be more circular in ... signals at S1 (or S2) and S4 (or S3) should be created individually making additional voltage vectors V0 and V7 which act as a zero voltage vector at Sectors and in four-switch DTC of a BLDC motor ... automatically shaped to obtain the desired electromagnetic torque characteristics using (1) When the actual stationary reference frame back-EMF constant waveforms from the pre-stored look-up table...
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Thiết kế và hoàn thiện mô hình KIT thực tập servo motor và driver
Ngày tải lên :
20/04/2016, 20:19
... Trang Hình Ảnh minh h a động AC servo - Động AC servo d a tảng động xoay chiều pha Động xoay chiều pha làm việc theo nguyên lý cảm ứng điện từ Khi cấp điện áp xoay chiều pha vào động cơ, stato ... trường quay, từ trường tác động lên roto làm roto quay theo Hình Stato dòng điện pha GVHD: Th.s Đoàn Minh Hải Trang Hình Cấu trúc động AC servo 1.3 Động AC servo Σ – L Series SGML hãng Yaskawa Nhật ... Yaskawa Nhật Bản Hình Động AC servo Yaskawa SGML-02AF12 1.3.1 Thông số kĩ thuật Bảng thông số kĩ thuật động AC servo SGML-02AF12 GVHD: Th.s Đoàn Minh Hải Trang Các thông số quan trọng cần ý: - Công...
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Báo cáo hóa học: " Oromotor variability in children with mild spastic cerebral palsy: a kinematic study of speech motor control" docx
Ngày tải lên :
19/06/2014, 08:20
... deviation of kinematic data by the mean kinematic data Larger CV indicates higher variability of kinematic data in speech tasks Statistical Analysis Group differences in age were compared by an ... experimental setup of kinematic analysis, kinematic data collection and analysis, and revising of this manuscript WHH carried out the kinematic data collection and analysis FGY participated in the data ... kinematic analysis of speech tasks The reflective markers were attached to the facial mask and oral areas and reference coordination system was established by marks on the mask mask helps to establish...
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Báo cáo hóa học: " Applying a brain-computer interface to support motor imagery practice in people with stroke for upper limb recovery: a feasibility study" docx
Ngày tải lên :
19/06/2014, 08:20
... least-square sense The feature separability was quantified off-line using the cross-validation estimate of the CA obtained with a linear discriminant analysis approach amplitude was proportional ... chair and table, woodblocks, a cricket ball, a sharpening stone, two different sizes of alloy tubes, a washer and bolt, two glasses, a marble and a mm ball-bearing The ARAT uses an ordinal scale ... feedback may frustrate the subject and thus cause more of a distraction rather than assistance in performing MI of rehabilitative tasks There is also a concern that with an inaccurate feedback...
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Báo cáo hóa học: " Reversal of TMS-induced motor twitch by training is associated with a reduction in excitability of the antagonist muscle" ppt
Ngày tải lên :
19/06/2014, 08:20
... revealed by transcranial magnetic stimulation in human European Journal of Neuroscience 2005, 21:259-266 Tyc F, Boyadjian A: Cortical plasticity and motor activity studied with transcranial magnetic ... Guttmann, Universitat Autonoma de Barcelona, Barcelona, Spain 6Laboratory of Neuromodulation, Spaulding Rehabilitation Hospital, Harvard Medical School, Boston, MA, USA 16 17 18 19 20 Authors’ contributions ... study design was the lack of power to conduct a multi-factorial analysis that includes all the data (i.e., agonist and antagonist muscle data); therefore future studies with a larger sample size...
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báo cáo hóa học: " Human-robot cooperative movement training: Learning a novel sensory motor transformation during walking with robotic assistance-as-needed" doc
Ngày tải lên :
19/06/2014, 10:20
... conventional joystick and the TheraJoy device in both the horizontal and vertical configurations, each within multiple areas of the arm workspace Data and statistical analysis The data was analyzed across ... [31] and Reinkensmeyer [32] used games and simple or commercial hardware to assess and motivate arm use Our approach also uses commercially available, gamebased activities and custom assessment activities ... defined in Table 2: the Movement Speed metric These data have been analyzed with the special attention paid to validate hypotheses and Mean and standard deviation values are calculated and presented...
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báo cáo hóa học: " Human-robot cooperative movement training: Learning a novel sensory motor transformation during walking with robotic assistance-as-needed" ppt
Ngày tải lên :
19/06/2014, 10:20
... relax its assistance at a rate faster than the human motor system learns to decrement its own force That is, the robot must adapt its performance to the learning human faster than the human adapts ... Creating a Virtual Impairment and for Assisting in Motor Learning Experimental Apparatus for Creating a Virtual Impairment and for Assisting in Motor Learning Picture (left) and diagram (right) ... experimental setup The robot makes use of a linear motor with two forcer coils and a V-shaped linkage to accommodate and drive motion of the robot's apex in the parasagittal plane The apex is attached...
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Báo cáo y học: " Clinical utility of tibial motor and sensory nerve conduction studies with motor recording from the flexor hallucis brevis: a methodological and reliability study" pptx
Ngày tải lên :
10/08/2014, 21:24
... values have acceptable intra-rater reliability and variability Acknowledgements The authors thank Amanda Antczak for her assistance with many aspects of this project, as well as the participants ... previously A moderate degree of variability was noted in our reported tibial (FHB) motor as well as medial plantar and lateral plantar sensory amplitudes both within and between participants All amplitude ... amplitude and latency data was found to have a non-normal positively skewed distribution The motor latency data was transformed with a square root as this most closely approximated a normal curve A natural...
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AN0532 servo control of a DC brush motor
Ngày tải lên :
11/01/2016, 11:48
... Loads extended math library AARG and BARG ; ; ARGUMENTS: A => AARG ; B => BARG ; ; TIMING (cycles): LOADAB MACRO MOVFP MOVFP MOVFP A, B A+ B0,AARG+B0 A+ B1,AARG+B1 B+B0,BARG+B0 ; load lo byte of A ... CPFSGT CALL WREG SATFLAG doIntegral ; if previous output saturated, ; not accumulate integrator LOADAB CALL ADD32 INTEGRAL,KI Dmult DPX,Y ; compute KI*INTEGRAL MVFP16 SUB16 MVFP16 CALL ADD32 U0,AARG ... CMDCHAR,CMDTEMP,CMDPTRH,CMDPTRL PARTEMP,PARLEN,PARPTR ; ; ; ; ; ; iovalue buffer iovalue buffer iovalue buffer isr save storage command interface variables parameter variables AN532 DS00532C-page 45 00000031...
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Drawing - Fun With A Pencil
Ngày tải lên :
13/09/2012, 14:19
... can trace a photo, and draw from the tracing, or take any of your own drawings and distort them Here again is a chance for your own invention Draw a square around your subject Divide each way ... Nevertheless, we can take as a basic form a ball sliced off at the sides, leaving it a little wider one way than the other, and adding to it or taking some away The forehead may be flattened, cut ... make any allowance for the variety of shapes 36 After this book was published, I learned with interest that a similar basic head form has been used for years by Miss E Grace Hanks of the Pratt...
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A simple introduction to working with LVM
Ngày tải lên :
18/09/2012, 10:12
... hda1, hda2, and hda3 are all physical volumes We'll initialize hda3 as a physical volume: root@lappy:~# pvcreate /dev/hda3 If you wanted to combine several disks, or partitions you could the same ... that we have a volume group (called skx-vol) we can actually start using it Working with logical volumes What we really want to is create logical volumes which we can mount and actually use In ... that the test partition is full and we want to make it bigger First of all we can look at how big it is at the moment with lvdisplay: root@lappy:~# lvdisplay - Logical volume LV Name VG Name...
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Báo cáo y học: " A retrospective quality assessment of pre-hospital emergency medical documentation in motor vehicle accidents in south-eastern Norway"
Ngày tải lên :
25/10/2012, 09:56
... medical technicians (EMTs) and/or paramedics The air ambulances were staffed with a pilot, an anaesthesiologist, and a rescue professional 2.2 Data collection Study approval and appropriate permits ... for each patient during data analysis Each MVA could involve several patients, and since each patient could be cared for by Staff and Søvik Scandinavian Journal of Trauma, Resuscitation and Emergency ... Kurola J, Nakstad AR, Sandberg M: Prehospital airway management: guidelines from a task force from the Scandinavian Society for Anaesthesiology and Intensive Care Medicine Acta Anaesthesiol Scand...
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Báo cáo y học: "Pre-hospital intubation by anaesthesiologists in patients with severe trauma: an audit of a Norwegian helicopter emergency medical service"
Ngày tải lên :
25/10/2012, 09:56
... Norwegian Air Ambulance Foundation Author details Department of Research and Development, Norwegian Air Ambulance Foundation, Drøbak, Norway 2Department of Anaesthesiology and Intensive Care, Stavanger ... by anaesthesiologists in patients with severe trauma revealed that, despite a high success rate and few recorded airway management-related complications, a substantial number of patients with a ... Science Data Service approved the collection and recording of the study data Statistics Data were recorded into a database designed with File Maker (FileMaker Inc., Santa Clara, CA, USA) We used Table...
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Báo cáo y học: " Implementation of a new emergency medical communication centre organization in Finland an evaluation, with performance indicators"
Ngày tải lên :
25/10/2012, 10:02
... pre-hospital deaths and priority A assignments was quite small, and was spread over several years Another bias in our result could have been caused by the impact of external factors such as ambulance ... on performance Acta Anaesthesiol Scand 2010, 54(6):689-695 Handbooks of the Ministry of Social Affairs and Health Ambulance and emergency care services: A handbook for drawing up an alarm procedure ... in East and Central Uusimaa, an area of southern Finland where the EMCC covers about 300 000 inhabitants We identified performance indicators and compared them with data collected before and after...
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Báo cáo y học: " Experimental ablation of the pancreas with high intensity focused ultrasound (HIFU) in a porcine model"
Ngày tải lên :
25/10/2012, 11:18
... Ltd Tokyo, Japan) Statistical analysis Data were expressed as means ± standard deviation (SD), and comparisons were performed with Wilcoxon rank sum test All statistical analyses were carried out ... vacuolated, and mitochondria swelled to a circular shape with a clear matrix and short or disappeared cristae, which were vacuolar appearances Smooth and rough endoplasmic reticulum expanded and became ... The minimal invasiveness and accurate targeting with a real-time US guide allow HIFU to precisely ablate lesions of large size, irregular shape, and even multi-modularity A major advantage of HIFU...
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Báo cáo y học: "Two-year Outcome of Turkish Patients Treated with Zotarolimus Versus Paclitaxel Eluting Stents in an Unselected Population with Coronary Artery Disease in the Real World: A Prospective Non-randomized Registry in Southern Turk
Ngày tải lên :
25/10/2012, 11:18
... Turkish patients Abbreviations ACC: American College of Cardiology; AHA: American Heart Association; CABG: coronary artery binding graft; CK: creatine kinase; MACE: major adverse cardiac events; ... 30 days; late, >30 days and very late, >1 year) Myocardial infarction was defined as a creatine kinase (CK) elevation >2 times above the upper limit of normal levels with any associated elevation ... primary clinical efficacy end points included major adverse cardiac events (MACE) at two year (MACE: Death, myocardial infarction, target vessel revascularization (TVR) Target vessel revascularization...
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Báo cáo y học: "A cyclic-RGD-BioShuttle functionalized with TMZ by DARinv “Click Chemistry” targeted to αvβ3 integrin for therapy"
Ngày tải lên :
25/10/2012, 11:40
... chloroform and ml TEA at 0-5 °C After h at room temperature, the solution was washed with water, N HCl and again with water The organic layer was dried over Na2SO4 and evaporated The residue was purified ... coloured and maintained for h at room temperature Then the organic phase was washed with water, followed by 1N HCl and again water The organic layer was dried over Na2SO4 and evaporated The resulting ... Integrins alpha v beta and alpha v beta promote adenovirus internalization but not virus attachment Cell 1993; 73: 309-19 339 21 Gasparini G, Brooks PC, Biganzoli E, et al Vascular integrin alpha(v)beta3:...
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