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Comparison of advantages and disadvantages between high-voltage motor and low-voltage motor

High-voltagemotorandlow-voltagemotorhavetheirownadvantagesanddisadvantages.Whataretheiradvantagesanddisadvantages?   Comparedwithlow-voltagemotor,high-voltagemotorhasthefollowingadvantages:   1.Thepowerofthemotorcanbeincreasedtoseveralthousand,eventensofthousandsofkilowatts.Thisisbecause,atthesamepoweroutput,thecurrentofthehigh-voltagemotorismuchsmallerthanthatofthelow-voltagemotor.Forexample,theratedcurrentof500KW,4-stagethree-phaseACmotorisabout900Awhenratedvoltageis380V,andonlyabout30Awhenratedvoltageis10KV.Therefore,thewindingofTakanomotorcanbeusedwithsmallerdiameter.Asaresult,thestatorcopperlossofthehigh-voltagemotorwillbesmallerthanthatofthelow-voltageclick.Forlargerpowermotors,whenusinglowvoltage,largerstatorslotsareneededbecauseofthickerconductors,whichmakesthediameterofstatorcoreverylargeandthevolumeofthewholemotorbecomeverylarge.   2.Forlarge-capacitymotors,thetotalinvestmentofpowersupplyanddistributionequipmentusedbyhigh-voltagemotorsislessthanthatoflow-voltagemotors,andthelinelossissmaller,whichcansaveacertainamountofpowerconsumption.Especiallythe10KVhighvoltagemotorcandirectlyusethepowergrid.Inthisway,theinvestmentinpowerequipmentwillbecomeless,theusewillbecomeeasier,andthefailureratewillbecomesmaller.   Comparedwithlow-voltagemotor,thedisadvantagesofhigh-voltagemotorareasfollows:   1.Thecostofwindingisrelativelyhigh,andthecostofrelatedinsulatingmaterialswillincreaseaccordingly.   2.Therequirementofusingenvironmentismuchhigherthanthatoflowvoltagemotor.   3.Theinsulationtreatmentprocessismoredifficult,theman-hourcostismore,andthemanufacturingcycleofthemotorislonger.

Motor Efficiency in Ground Source Heat Pump System

HighEfficiencyMotorQuestion Accordingtotheworkingefficiencyofthemotor,therearetwokindsofmotorsusedingroundsourceheatpumpsystem:standardefficiencymotorandhighefficiencymotor.Comparedwithstandardefficiencymotors,theefficiencyofhighefficiencymotorscanbeincreasedby2to10percentagepointsaccordingtothedifferentpower.Highefficiencymotorsarerealizedbybetterdesignanduseofspecialmaterialsthatcanreducelosses,butthepriceisabout10%~30%higherthanstandardefficiencymotors,soonlyonefifthoftheMotorssoldworldwidearehighefficiencymotors.Motorefficiencyistheratioofmechanicalpoweroutputtopowerinput,usuallyexpressedasapercentage.Figure1showsthedifferencebetweenstandardmotorandhighefficiencymotor.Highefficiencymotorproducedbyimproveddesignmaterialsandtechnologycangeneratemorepowerperunitpowerconsumption. Usually,highefficiencymotorshavehighloadcoefficient,betterinsulationandvoltagewithstand,lowcalorificvalueandlessvibration,thusincreasingreliability.HighefficiencymotorsmusthaveafullloadefficiencyequaltoorgreaterthanthatofordinarymotorsspecifiedbytheAmericanAssociationofInternationalElectricalManufacturers(NEMA).Inotherwords,amotorefficiencymustbeequaltoorexceedtheNEMAhighefficiencymotorfullloadengineeringefficiencyvaluebeforeitcanbecalledahighefficiencymotor.Thecostofahigh-efficiencymotordependsontheprice,efficiency,usetime,installationandmaintenancecostsandlaborcostsofthemotor.Theextrapurchasecostofhigh-efficiencymotorscanbequicklyrecoveredbysavingoperatingcosts.Usually,theextracostofhigh-efficiencymotorscanbeoffsetbytheenergyconsumptionsavedbytwoyearsofoperation.Forexample,assumingthat50hp,75%oftheloadfactormotorrunsformorethan4,000hoursperyearandtheelectricitycostis$0.04/kWh,animprovementpointcansave4079kwhor$163peryear.Therefore,ahighefficiencymotor,through4%efficiencyimprovement,cansave$1304intwoyearscomparedwiththestandardmotor,basicallymeetthetwo-yearreturnstandard. TheRelationbetweenMotorSpeedandLoad Theloadofcentrifugalpumpsandfansisextremelysensitivetothechangeofspeed.Increasingthespeedbyonly5r/mincanleadtoasignificantincreaseinflowspeedandenergyconsumptionandadecreaseinefficiency.Therefore,whenreplacingapumporfan,thefullloadspeedmustbechosentobeequaltoorlowerthanthespeedofthereplacedmotor.Thepowerofthecentrifugalmotordrivingthefanisproportionaltothecubeoftherotationalspeed.Forexample,ifthespeedofthemotorincreasesfrom1740r/minto1760r/min,thepowerconsumptionwillincreaseby3.5%eventhoughitonlyincreasesby20r/min,andtheairorwatervolumewillchangewiththesquareofthespeed.Slipandspeeddependonload,whichmakesitpossiblefordifferentmotorstodrivethesameload.Forexample,whena100hpmotoroutputs25%ratedpower,itcanbereplacedbya50HPorlowerhorsepowermotor,butatthistimethepoweris50%of50hp,or62.5%of40hp,83%of30HPmotor,and25HPfullloadoutput.Whentheloadofthemotorincreasesgradually,thespeedwilldecrease,andthefull-loadspeedwillbethefull-loadspeed.Hence,theAnhuiElectricPowerMotorindicatesthatonlythemotorwithlowerspeedorlargerloadcanoperateinawayclosetothesynchronousspeed,andthatthemotorwithlowerpowerandfull-loadefficiencycanworkataspeedclosetothesynchronousspeedinsteadofthemotorwithhigherpowerbutlowerspeed,whichcanobviouslysaveoperation.Cost.

Motor Encyclopedia: The Difference between DC Motor and AC Motor

按照电源类型，电机可以分为直流电机和交流电机，本期电机百科，皖南电机将简单介绍直流电机和交流电机以及两者的区别： 直流电机是能实现直流电机和机械能互相转换的电机，当机械能转换为电能。直流发电机的工作原理就是把电枢线圈中感应的交变电动势，靠换向器配合电刷的换向作用，使之从电刷端引出时变为直流电动势的原理。 直流电机工作原理 直流电机里边固定有环状永磁体，电流通过转子上的线圈产生安培力，当转子上的线圈

Reasons for Breaking of Pole Winding in DC Motor and Improvement Measures

1.Theimpactvibrationofthemotorislarge,theelasticityofthemotorsupportisstrengthened,andtheimpactofthedynamicimpactofthelineisreduced. 2.Thehardlinkisbrokenbetweenthepoles.Thebraidedsoftorcableconnectionisusedinstead,andtheconnectionisfastenedandpinnedwithahawktoreducethepoweroftherunningconnection. 3.Thecopperstripattheboltjointisbroken,andacopperstripattheendofthecoilleading-outendandtheendturnfixingisdouble-deckedtoenhancethemechanicalstabilityoftheplace. 4.Connectingboltisloose.Springpadorotherbrakingcoilcanbeadded.TheboltshouldnotbelessthanM8.Twoboltscanbeusedtofastenmediumandlargetractionmotors. 5.Thepaintfilmontheboltjointisnotscrapedcleanorthesurfaceisoxidized.Itcantightentheboltagainaftersandingtheconductivecontactsurfaceandwraptheinsulation. 6.Brokencopperstripjointcausedbypoorwelding,reweldingorreplacementofcoils.

Changsha County Electrical Machinery Energy Efficiency Promotion Conference Held in Tianneng Electric Machinery

On the morning of July 23, 2015, in order to better promote the energy efficiency level of industrial enterprises in Changsha County and promote the upgrading of motor industry, the county-wide Conference on the promotion of motor energy efficiency was held in the

Tianneng Electric dispatched elite soldiers to participate in welding skills competition

On May 17, 2013, the Changsha County Federation of Trade Unions held a welding skill competition with the theme of "We Create a Happy Dream through Labor". The competition was held as scheduled in Changsha County Vocational Secondary Technical School. Tianneng Electrical Machinery also dispatched elite generals. We believe that they will compete in level, style, friendship and team spirit to win glory for Tianneng.

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