减速机电动滚筒振动源电动机新型产品规划与开发

1、Efficiency trends in electric machines and drives Energy PolicyThisAlmost all electricity in the UK is generated by rotating electrical generators, and approximately half of it is used to drive electrical motors. This means that efficiency improvements to electrical machines can have a very large im

2、pact on energy consumption. The key challenges to increased efficiency in systems driven by electrical machines lie in three areas: to extend the application of variable-speed electric drives into new areas through reduction of power electronic and control costs; to integrate the drive and the drive

3、n load to maximise system efficiency; and to increase the efficiency of the electrical drive itself. In the short to medium term, efficiency gains within electrical machines will result from the development of new materials and construction techniques. Approximately a quarter of new electrical machi

4、nes are driven by variable-speed drives. These are a less mature product than electrical machines and should see larger efficiency gains over the next 50 years. Advances will occur, with new types of power electronic devices that reduce switching and conduction loss. With variable-speed drives, ther

5、e is complete freedom to vary the speed of the driven load. Replacing fixed-speed machines with variable-speed drives for a high proportion of industrial loads could mean a 1530% energy saving.could save the UK 15 billion kWh of electricity per year which, when combined with motor and drive efficien

6、cy gains, would amount to a total annual saving of 24 billion kWh.Article OutlineIntroductionEnergy consumptionCurrent state of the artGenerationElectric motorsPower electronic convertersVariable-speed drivesComplete systemIndustrialHouseholdTransportMarket barriersFuture advances to 2050 and beyond

7、Key challengesExtension of application areasIntegrated system designDrive efficiencyKey engineering and scientific advancesElectrical machinesPower electronics and controlIntegrated systemsConclusionsReferencesDesign and implementation of a novel hybrid-electric-motorcycle transmission Applied Energ

8、yThis hybrid power system incorporates a mechanical type rubber V-belt, continuously-variable transmission (CVT) and chain drives to combine power of the two power sources, a gasoline engine and an electric motor. The system uses four different modes in order to maximize the performance and reduce e

9、missions: electric-motor mode; engine mode; engine/charging mode; and power mode. The main advantages of this new transmission include the use of only one electric motor/generator and the shift of the operating mode accomplished by the mechanical-type clutches for easy control and low cost. Kinemati

10、c analyses and design are achieved to obtain the size of each component of this system. A design example is fabricated and tested.Article OutlineIntroductionParallel hybrid transmissionKinematic analysis and designSpeed ratio of the chain drive and final driveSpeed ratio of the CVTThe speed ratio of

11、 the hybrid-power systemDesign examplesPrototype developmentTest and experimental resultsConclusionsAcknowledgementsReferencesA novel power splitting drive train for variable speed wind power generators Renewable EnergyIn this paper a novel electrically controlled power splitting drive train for var

12、iable speed wind turbines is presented. A variable speed wind turbine has many advantages, mainly it can increase the power yield from the wind, alleviate the load peak in the electrical-mechanical drive train, and posses a long life time, also, it can offer the possibility to store the briefly time

13、ly wind-conditioned power fluctuations in the wind rotor, in which the rotary masses are used as storages of kinetic energy, consequently, the variable speed wind turbines are utilized in the wind power industry widely. In this work, on the basis of a planetary transmission a new kind of drive train

14、 for the variable speed wind turbines is proposed. The new drive train consists of wind rotor, three-shafted planetary gear set, generator and servo motor. The wind rotor is coupled with the planet carrier of the planetary transmission, the generator is connected with the ring gear through an adjust

15、ment gear pair, and the servo motor is fixed to the sun gear. By controlling the electromagnetic torque or speed of the servo motor, the variable speed operation of the wind rotor and the constant speed operation of the generator are realized, therefore, the generator can be coupled with the grid di

16、rectly. At the nominal operation point, about 80% of the rotor power flow through the generator directly and 20% through the servo motor and a small power electronics system into the grid. As a result, the disadvantages in the traditional wind turbines, e.g. high price of power electronics system, m

17、uch power loss, strong reaction from the grid and large crash load in the drive train will be avoided.Article OutlineIntroductionConfiguration of the novel variable speed drive trainVariable speed operationPower splitting performanceTransmission efficiencyOperation rangeConclusionReferencesinFrom tr

18、ansmission error measurement to pulley -beltslip determinationserpentine belt drives: Influence of tensioner and belt characteristicsMechanism and Machine TheorySerpentine belt drives are often used in front end accessory drive of automotive engine. The accessories resistant torques are getting high

19、er within new technological innovations as stater-alternator, and belt transmissions are always asked for higher capacity. Two kind of tensioners are used to maintain minimum tension that insure power transmission and minimize slip: dry friction or hydraulic tensioners.An experimental device and a s

20、pecific transmission error measurement method have been used toevaluate the performances of a generic transmission by determining the pulleybelt slip for these twokinds of tensioner. Transmission error between pulleys, pulley/belt slip are deduced from pulley rotation angle measurements. Results obt

21、ained show that: the use of tensioner limits belt slip on pulleys, pulley -belt slip is reachable from transmission error measurement, belt non uniform characteristics are responsible of low frequency modulations of transmission error.Article OutlineIntroductionExperimental set upBelt drive descript

22、ionMeasurement devicesPulley belt slip analysisFrom transmission error to slip rateResultsTransmission error related to non uniform belt characteristicsConclusion ReferencesA compact, high efficiency contra-rotating generator suitable for wind turbines in the urban environment Renewable EnergyThis p

23、aper is concerned with the design, development and performance testing of a permanent magnet (PM) generator for wind turbine applications in urban areas. The radially interacting armature windings and magnet array are carried on direct drive, contra-rotating rotors, resulting in a high torque densit

24、y and efficiency. This topology also provides improved physical and mechanical characteristics such as compactness, low starting torque, elimination of gearboxes, low maintenance, low noise and vibration, and the potential for modular construction. The design brief required a 50 kW continuous rated

25、prototype generator, with a relative speed at the air-gap of 500 rpm. A test rig has been instrumented to give measurements of the mechanical input (torque and speed) and electrical output (voltage, current and power) of the generator, as well as temperature readings from inside the generator using

26、a wireless telemetry device. Peak power output was found to be 48 kW at a contra-rotating speed of 500 rpm, close to the design target, with an efficiency of 94%. It is anticipated that the generator will find application in a wide range of wind turbine designs suited to the urban environment, e.g.

27、types sited on the top of buildings, as there is growing interest in providing quiet, low cost, clean electricity at point of use.Article OutlineIntroductionDesign and manufacture considerationsTest facility constructionGenerator performance resultsConclusionsReferences电动滚筒电机和减速器新型驱动装置固定式和移动式带式输送机结构

28、紧凑、传动效率高、噪声低、使用寿命长，运转平稳、工作可靠、密封性好、占据空间小、安装方便、维护简单恶劣环境条件潮湿、泥泞、粉尘、高温工作环境皮带运输机和提升设备动力矿山、冶金、化工、煤炭、建材、电力、粮食及交通运输Electric drumMotor and reducerNewDriveFixed and mobileBelt ConveyorCompact, high transmission efficiency, low noise, long life, smooth operation, reliable sealing, small footprint, easy install

29、ation, simple maintenanceAdverse environmental conditionsWet, muddy, dust, high temperatureWork environmentBelt conveyor and lifting equipmentPowerMining, metallurgical, chemical, coal, building materials, electricity, food and transport1,440 articles found for: pub-date 1989 and tak( (Electric drum

30、 ) or Drive or (Motor and reducer ) or(Belt conveyor ) or ( lifting equipment ) or (Work environment ) and (New or (Fixed and mobile ) orCompact or (high transmission efficiency) or (low noise) or (long life) or (smooth operation) or (reliable sealing) or (small footprint)or (easy installation ) or

31、(simple maintenance ) and(Adverse environmental conditions ) or Wet or muddy or dust or (high temperature ) or Power orMining or metallurgical or chemical or coal or (buildingmaterials) or electricity or food ortransport )Designing Dryers Using Heat and Mass Exchange Networks: An Application toConve

32、yor Belt DryersChemical Engineering Research and DesignClassical 1-D numerical simulations of dryers involve the solution of non linear differential relations which include balance equations and transfer functions; namely, the drying rate equation and the heat transfer equation. These relations are

33、integrated by means of the network theory and a new approachtheNumber of Transfer Units method. This process leads to a non-linear algebraic system used to develop computer simulation programs. In this paper, the applications are based on the study of multiple-conveyor dryers. This type of dryer is

34、used for many chemical engineering industrial applications to dry coarse particles (i.e., over 5 to 10mm) or for food engineering. Numerical simulations are performed to analyse the drying efficiency of these conveyor dryers. Due to the heat and mass numbers of transfer units and to the network idea

35、, the computer programs run faster than classical ones. This program is involved in the expertise and study of the effectiveness ofmultiple-conveyor dryers. Some rules of behaviour of conveyor dryers are discussed and may be used in order to improve their design.Continuous weighing on a multi-stage

36、conveyor belt with FIR filter MeasurementToday higher speed of operation and highly accurate weighing of packages during crossing a conveyor belt has been getting more important in the food and distribution industries etc. Continuous weighing means that masses of discrete packages on a conveyor belt

37、 are automatically determined in sequence. Making the proper use of new weighing scale called a multi-stage conveyor belt scale which can be created so as to adjust the conveyor belt length to the product length, we propose a simplified and effective mass estimation algorithm under practical vibrati

38、on modes. Conveyor belt scales usually have maximum capacities of less than 80 kg and 140 cm, and achieve measuring rates of 150 packages per minute and more. The output signals from the conveyor belt scales are always contaminated with noises due to vibrations of the conveyor belt and the product i

39、n motion. In this paper digital filter of finite-duration impulse response (FEB) type is designed to provide adequate accuracy. The experimental results on conveyor belt scales suggest that the filtering algorithm proposed here is effective enough to practical applications. As long as spaces between

40、 successive products are set within a specified range, the products can be weighed correctly even if products having different lengths are transported in random manner.Article OutlineIntroductionBasic configurationOutline of conveyor belt scalesMinimum distance between productsDesign of FIR filtersT

41、echnical problemsNon-uniformly distributed weightAllowable range for searching a maximum valueExperimentsConclusionsAcknowledgementsReferencesInfluence of environmental conditions and building structure on food quality: survey of hand-crafted dairies in Northern Italy Food ControlThe present study i

42、nvestigated several small dairies, located in mountain areas of Northern Italy, with the aim to identify critical factors that are frequently neglected despite their potentially decisive role in improving hygiene standards of dairy processing and work safety. The results highlighted the structural a

43、nd procedural aspects involved in sanitary requirements of traditional dairy production.Our analysis has made it clear that processing environment is often inadequately protected from external contamination, and design and realisation of buildings is not suitable for food processing requirements. Fo

44、r example, the main critical points for food safety in relation to building structure are indoor layout of a dairy, and coating materials for floors and walls that, although smooth and washable, do not withstand chemical attack, environmental conditions, and mechanical stress. From a procedural poin

45、t of view, cleaning operations are not carried out thoroughly, and working practices are hygienically deficient.Article OutlineIntroductionMaterials and methodsDairiesBuilding and layoutMicrobiological monitoring of airMicrobiological monitoring of surfacesThe swab methodThe sponge methodMicrobiolog

46、ical analysisResults and discussionBuilding characteristics of mountain dairiesHygienic quality of processing environmentConclusionsAcknowledgementsReferencesA research survey of induction motor operation with non-sinusoidal supply wave formsElectric Power Systems ResearchThe developments in the pow

47、er electronics field have lead to an ever-increasing use of static switching devices to control the torque and speed of ac motors. Invariably, the output voltage and current waveforms of these devices contain numerous harmonics and these harmonics have detrimental effects on the motor performance in

48、 form of derating and torque pulsation, especially at low speed. The order and magnitude of these harmonics depend on the design as well as nature of load being supplied. The extensive research has been underway for a long time in order to assess the effects these harmonics have on induction motor p

49、erformance, and to investigate the various issues related to the use of induction motor to improve the drive performance and reduce the losses. This paper, therefore, presents a comprehensive review of research and developments in the induction motor operation with non-sinusoidal supply waveforms si

50、nce its inception. Attempts are made to highlight the current and future issues involved in the development of induction motor drive technology to impart good dynamic stability with improved performance. A list of 167 research publications on the subject is also appended for a quick reference.Articl

51、e OutlineIntroductionModeling and analysisInduction motor losses on non-sinusoidal supplyHarmonic reduction techniquesNoise and vibration in induction motor due to non-sinusoidalityDetection of rotor slot harmonics and speed estimationHarmonic current and torqueHarmonic currentHarmonic torqueEffect

52、of space harmonic on induction machine performanceStability analysisControl scheme for loss minimization in induction motor drivesUtilization of undesirable time- and space-harmonicsConclusionAcknowledgementsReferencesA new instantaneous reactive power based MRAS for sensorless induction motordriveS

53、imulation Modelling Practice and TheoryA model reference adaptive system (MRAS) based speed estimator for sensorless induction motor (IM)and thedrive is proposed in this paper. The MRAS is formed with instantaneous reactive power estimated stator current vector. Current, being a vector quantity, is

54、configured in terms of reactive power,which is a scalar quantity. The advantage is that we need not equate either or both the in-phase and quadrature components of the current vector. The performance of the estimator under regeneration is an important aspect, which is studied in this paper through t

55、he small signal analysis.Graphicalrepresentation in the speedtorque domain gives a clear idea about the stable and unstable zones ofoperation in the regenerating mode. Sensorless IM drive along with the proposed MRAS is verified through computer simulation.Commercializing light-duty plug-in/plug-out

56、 hydrogen-fuel- cell vehicles: Mobile Electricity technologies and opportunitiesJournal of Power SourcesStarting from the premise that new consumer value must drive hydrogen-fuel-cell-vehicle (H2FCV)commercialization, a group of opportunities collectively called Mobile Electricity “ is characterized

57、. Mobile Electricity (Me-) redefines H 2FCVs as innovative products able to import and export electricity across the traditional vehicle boundary. Such vehicles could provide home recharging and mobile power, for example for tools, mobile activities, emergencies, and electric-grid-support services.

58、This study integrates and extends previous analyses of H2FCVs, plug-in hybrids, and vehicle-to-grid (V2G) power.Further, it uses a new electric-drive-vehicle and vehicular-distributed-generation model to estimate zero-emission-power versus zero-emission-driving tradeoffs, costs, and grid-support rev

59、enues for various electric-drive vehicle types and levels of infrastructure service. By framing market development in terms of new consumer value flowing from Me-, this study suggests a way to move beyond the battery versus fuel-cell zero-sum game and towards the development of integrated plug-in/pl

60、ug-out hybrid platforms. As one possible extension of this Me- product platform, H2FCVs might supply clean,high-power, and profitable Me- services as the technologies and markets mature.Article OutlineIntroductionProblem: commercializing fuel-cell vehiclesApproach: Mobile Electricity innovationFocus