Drives and controls

Electric motors convert electrical energy into mechanical energy by utilizing the properties of electromagnetic energy conversion. The different types of motors operate in different ways and have different methods of calculating the performance, but all utilize some arrangement of magnetic fields. Understanding the concepts of electromagnetics and the systems of units that are employed is essential to understanding electric motor operation.The first part of this chapter covers the concepts and units and shows how forces are developed.

1184p beobobeo 01-08-2012 153 59   Download

D.C. motors General Fundamental equations and performance Wound-field motors Permanent-magnet motors Operating principles Commutation Rotation Compensation D.C. PM commutation Construction of the D.C. motor D.C. motor frame D.C. motor armature Brush gear Mountings D.C. PM design Rotor inertia Permanent-magnet materials 2 A.C. induction motors General Fundamental equations and performance Electrical characteristics of induction motors Torque characteristics Voltage-frequency relationship Increased voltage Reduced frequency Slip-ring induction motor Speed-changing motors A.C.

7p vankent 08-07-2010 109 26   Download

Industrial robots are currently employed in a large number of applications and are available with a wide range of configurations, drive systems, physical sizes and payloads. However, the numbers in service throughout the world are much less than predicted over twenty years ago (Engelberger 1980). This is despite major technological advances in related areas of computing and electronics, and the availability of fast, reliable and low-cost microprocessors and memory. This situation is mainly a result of historical and economic circumstances, rather than technical considerations.

458p lulanphuong 23-03-2012 64 18   Download

(bq) part 1 book "mechanisms and mechanical devices" has contents: basics of mechanisms; motion control systems; industrial robots; mobile scientific, military, and research robots; clutches and brakes; gears: devices, drives, and mechanisms,.... and other contents.

236p bautroibinhyen19 02-03-2017 35 9   Download

(bq) part 2 book has contents: journal bearings, belt drives, worm gearing, vibration and control of vibration, cam mechanisms, load cycle analysis, fluid power systems and circuit design, noise and its control, robots and smart machines, deflection,... and other contents.

851p bautroibinhyen18 21-02-2017 36 7   Download

since the first edition of analysis of electric machinery was published, the reference frame theory that was detailed in the book has become the universally accepted approach for the analysis of both electric machines and electric drive systems. now in its second edition, analysis of electric machinery and drive systems presents, in one resource, the application of this theory to the analysis, simulation, and design of the complete drive system including the machine, converter, and control.

305p bautroibinhyen19 27-02-2017 43 7   Download

The accuracy of a machined part depends on the precision motion delivered by a machine tool under static, dynamic, and thermal loads. The accuracy is evaluated by measuring the discrepancy between the desired part dimensions identified on a part drawing and the actual part achieved after machining operations.

13p phuphong 10-12-2009 74 5   Download

Just under a third (31%) of overall activity in this sector is in manufacturing, with the highest levels of  manufacturing  in  the Wind  and  Carbon  Capture  &  Storage  sectors ‐  the  latter  a  reflection  of  the  current drive to prove the technology through pilot projects. Given the size of the LCEGS sector and its  growth  rate  in  both  domestic  and  global  markets,  environmental  activities  offer  an  attractive  opportunity for the UK’s manufacturing base to exploit current and emerging technologies.

43p dangsuynghi 15-03-2013 44 5   Download

This increased level of risk among young men is not confined to driving. The WHO (1999) and (2002) report that men are also more likely to die from falls, drowning, poisoning and a range of other events. Only in the case of deaths in fires are women slightly more over-represented than men. The report also notes that injury and fatality rates are higher among men for every type of road injury victim in several developing countries. In Kampala, Uganda, for example, males outnumbered females by between 2 and 7 to 1 among injured vehicle drivers, passengers and pedestrians. In the...

11p quaivatxanh 29-11-2012 43 4   Download

Long-term challenges remain: continuing with structural reforms, maintaining rapid and steady economic growth and fiscal discipline, boosting employment, reining in the informal economy, and making progress with respect to EU accession. While the latter is expected to be a long and complicated process, it will remain a driving force for Turkey’s reform efforts. In addition, accelerating the reform process will be vital for a positive outlook. Recent political turmoil and upcoming local elections in 2009 could become a distraction for further reforms.

9p quaivatxanh 30-11-2012 43 4   Download

The Port Authority would likely benefit from a meaningful organizational redesign to focus on  its  strategic  business  units  and  cost  saving  shared  services  functions.   To  be  successful,  entrusted appointed senior leadership needs effective command and control to manage change  and  drive  accountability  throughout  the  organization.   Career  service  management  must  proactively communicate reliable and relevant information in proper context so that appointed  leadership is best positioned for effective decision making.

53p tay_thi_le 19-02-2013 46 4   Download

The time is gone when machines, controls, and drives were ‘‘add-ons,’’ as shown in Figure 1. Early machines used add-on drives. These drives had one thing in common: There was no interaction among the control, drive, and machine. To a large extent these machines were open loop. Today’s numerically controlled machines are tightly integrated machine systems. There is a great deal of interaction between the machine, drive, and control. It is this interaction that results in problems with stability, surface finish on the work part, and accuracy.

10p thanhspktcdt10 23-03-2013 36 3   Download

To their credit, some highway advocates support tolling of added capacity to recover costs and control congestion, but this only addresses two of the external costs of induced travel. Only if all the pricing reforms described above are fully implemented can roadway expansion be justified and efficient.

0p trinhcaidat 22-04-2013 35 3   Download

(bq) the book is constructed in following order. chapter 1 explains the features of the electric drive system and trends of development in related technologies. moreover, chapter 1 also explains basic knowledge of mechanics, which is used throughout this book, and also a description for typical characteristics of the load driven by electric machines is provided. the many end-of-chapter problems provide many examples of the drive systems i designed and tested. by solving the problems, some knowledge of the actual industry can be shared.

413p cumeo5000 06-08-2018 22 2   Download

This paper presents a slip suppression controller using sliding mode control method for electric vehicles which aims to improve the control performance of Evs in both driving and braking mode.

9p sansan2 26-05-2018 19 1   Download

In the proposed IOV system, there implements a series of valuable functions including real-time emission inspection, vehicle fault alarm and disposal recommendation, automatic maintenance reservation, path to maintenance optimization, driving habits statistics. This system can greatly improve the efficiency, accuracy and instantaneous of the vehicle fault diagnostic and finally the customer satisfaction.

6p praishy2 27-02-2019 15 1   Download

In this paper, trajectory tracking of a differential drive nonholonomic mobile robot is presented. In addition to the complex relations of the control system, the nonholonomic system adds complexity to the system which has been solved using the feed-forward and feedback fuzzy logic controllers.

5p praishy2 27-02-2019 9 0   Download

In this paper, we deal with the real-time navigation problem of a differential drive robot in dynamic environments. As a rule, the robot is controlled by wheel velocity commands at sampling intervals and moves along a straight line or a circular arc in accordance with those commands.

7p praishy2 27-02-2019 8 0   Download

For driving behavior, we acquired the vehicle’s state from inertial measurement unit (IMU) and gas pedal sensors. The principle component analysis (PCA) was used to select the components that have high variance. The variance values were used to differentiate fatigue drivers, which are assumed to have higher driving activities, from normal drivers.

7p praishy2 27-02-2019 9 0   Download

The robot is driven by drive commands of a driving schedule within a predefined time variance along the scheduled route. The definite travel-time basis benefits from the control technique of the design of a cyber-physical vehicle system, and is surmised to be a fundamental property of car-driving on the tunnel-way.

4p praishy2 27-02-2019 13 0   Download