Reliability of adjustable speed drives

... 1995 2003 noticeably, but still the total reliability of an ASD would not Product in the Market (Year) yet reach the reliability of a DOL motor Reliability of frequency converters has risen considerably ... Riikonen is with ABB Drives in Helsinki, Finland Pieters and Riikonen are Members of the IEEE This article first appeared as “Improving ASD Reliability: Adjustable Spee...

Ngày tải lên: 26/11/2015, 09:41

... P a g e Simulation and Speed Control of Induction Motor Drives 2012 CHAPTER ANALYSIS OF VARIOUS METHODS FOR SPEED CONTROL OF IM The various methods of speed control of 3- Induction motor are ... Simulation and Speed Control of Induction Motor Drives 2012 Figure 3.13: Torque -Speed Characteristics for machine parameters as in Fig 3.8 13 | P...

Ngày tải lên: 18/12/2013, 22:06

... using the following keyword combinations: (glutathione s-transferase OR GST OR GSTT1 OR GSTM1 OR GSTP1) AND (polymorphism OR polymorphisms OR SNP OR mutation) AND (cancer OR malign* OR carcinoma ... analysing a determined polymorphisms between the studies examining it within 1-3 polymorphisms versus studies examining the same polymorphism among more than polymorphi...

Ngày tải lên: 25/10/2012, 10:51

... with my thesis ii ABSTRACT The main aim of this minor thesis is to evaluate the reliability of the final Achievement Computer-based MCQs Test for the 4th semester non- English majors at Hanoi University ... undertake this study entitled A study on the reliability of the final achievement Computer-based MCQs Test for the 4...

Ngày tải lên: 10/04/2013, 14:46

... 16 CP16 RELIABILITY COEFFICIENTS N of cases = 19.0 N of items = 16 ALPHA = 8306 - 74 APPENDIX STATISTICAL T- TEST T -TEST OF SUCCESS FACTORS OF JOINT VENTURE'S PERFORMANCE (a) T- Test Of Success ... (respective shares of the partner): Date of establishment: Type of industry: Total number of employees • Number of Vietnamese: • Number of Foreign: • Ratio of Vietna...

Ngày tải lên: 13/04/2013, 11:01

... Hydro-Québec, Natural Resources Canada and the Natural Sciences and Engineering Research Council of Canada VII [1] REFERENCES C.L Kana; M Thamodharan and A Wolf; “System management of a wind- energy converter , ... a buck boost converter inserted between the rectifier output and the DC bus The control relationship between generator speed and the DC bus voltage is...

Ngày tải lên: 03/01/2014, 19:15

... same for the 1l* and 13 &harmonic currents To eliminate these errors, the harmonic current references are obtained as a modification of the identified harmonic currents according to Fig 8, with ... are used: V COMPENSATION OF CURRENT CONTROLLER ERROR Fig shows that the PI current controller introduces a gain- and phase error in closed loop for the harmonic current refer...

Ngày tải lên: 03/01/2014, 19:45

... and KFB = 1, what are the units of KP ? Calculate the poles of the closed-loop system 78 Parameter Setting of Analog Speed Controllers P3.4 For the system in P3 .3, determine the closed-loop transfer ... function assumes the following form: 70 Parameter Setting of Analog Speed Controllers WS (s ) = (1 + sτ SC ) KI B s (1 + sτ TA )(1 + sτ P ) (3. 23) Fig 3. 11 Sp...

Ngày tải lên: 27/01/2014, 15:20

... design of a new MDO: first about the relationship of the MDO to the President, next about Congress’s role, third about the source of the MDO’s funding, and then the role of stakeholders and other ... specify terms of key leadership positions, as it does with the ten-year term of the director of the Federal Bureau of Investigation or the staggered 14-year te...

Ngày tải lên: 16/03/2014, 03:20

... describes the results of a study of the sources and reliability of the supply of imported materials on which United States manufacturers are dependent It should be of interest to a broad spectrum of ... conclude from the data and analyses described in the text of this report that the critical issues associated with the supply of minerals are less about the...

Ngày tải lên: 16/03/2014, 03:20

... but the relevant question is whether the sum of the discounted net social benefits during the life of the infrastructure justifies the investment cost The description of the costs and benefits of ... analysis of the high- speed train in Spain’, The Annals of Regional Science, 31: 175-188 de Rus, G and Nombela G (2007), ‘Is investment in high speed r...

Ngày tải lên: 17/03/2014, 08:20

... of voting system software by requiring that software be submitted to NIST’s National Software Reference Library, and by verifying that the systems, including hardware, software, and software ... laboratories and assessing the test results Page 42 GAO-05-956 Electronic Voting Systems National Initiatives Are Under Way to Improve Voting System Security and Re...

Ngày tải lên: 23/03/2014, 03:20

... 10 Closed-loop position servo JUST WHAT ARE SOME OF THE BENEFITS OF A SERVO SYSTEM? Here are six benefits of a machine axis feed servo drive Shorter positioning time: The servo operates at maximum ... answer these two basic questions: What is a servo? Why use a servo? Any discussion of servos will have to employ the term ‘‘feedback.’’ Thousands of times every day we require...

Ngày tải lên: 23/03/2014, 10:20

... Real-Time: How Marketing & PR at Speed Drives Measurable Success Portions of this e-book appear in Real-Time Marketing & PR: How to Instantly Engage Your Market, Connect with Customers, and Create Products ... Real-Time: How Marketing & PR at Speed Drives Measurable Success 19 I was happy to find that three companies AT& T, Hewlett-Packard, and...

Ngày tải lên: 29/03/2014, 20:20

... mathematical point of view The advanced application of industrial servo drives requires the use of differential equations to describe mechanical, electrical, and fluid systems As applied to servo drives there ... Part I discussed the basics of industrial servo drives from a hardware point of view Physical parameters and practical applications were discussed Part...

Ngày tải lên: 30/03/2014, 10:20