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connection and difference between high efficiency motor and ordinary motor

2020-07-25 11:25:59来源:

one、two concepts

1. ordinary motor: the motor is a device that converts electrical energy into mechanical energy. 70% - 95% of the electrical energy absorbed by the motor is converted into mechanical energy, which is often referred to as the efficiency value of the motor. it is an important technical index of the motor. the remaining 30% - 5% is consumed by the motor itself due to heating and mechanical loss, so this part of electrical energy is wasted.

2. high efficiency motor: the motor with high power utilization is called high efficiency motor, abbreviated as & ldquo; high efficiency motor & rdquo;.

for ordinary motors, it is not easy to increase the efficiency by 1 percentage point, and the materials will increase a lot. moreover, when the motor efficiency reaches a certain value, no matter how many materials are added, it can not be improved.

at present, most of the high-efficiency motors on the market are the updated products of three-phase asynchronous motors, that is, the basic working principle has not changed.


two、highefficiencymotorismainlydifferentfromordinarymotor

1.addmaterials:increasetheouterdiameterofironcore,increasethelengthofironcore,increasethesizeofstatorslotandincreasetheweightofcopperwiretoimproveefficiency.forexample,y2-8024motorchangestheouterdiameterfromthecurrentφ120toφ130,someabroadincreasedφ145,whileincreasingthelengthfrom70to90.theironconsumptionofeachmotorisincreasedby3kg,andthecopperwireisincreasedby0.9kg.

2.siliconsteelsheetswithgoodmagneticconductivityareused.inthepast,hotrolledsheetswithlargeironlossareused,andnowhigh-qualitycoldrolledsheetswithlowlossareused,suchasdw470.evenlowerdw270.

3.improvemachiningaccuracy,reducemechanicalloss,replacesmallfan,reducefanloss,andadopthigh-efficiencybearing.

4.theelectricalperformanceparametersofthemotorareoptimizedbychangingtheslotshape.

5.castcopperrotorisadopted(complexprocessandhighcost).

three、characteristicsofhighefficiencymotor

1.saveenergyandreducelong-termoperationcost.itisverysuitablefortextile,fan,waterpumpandcompressor.thepurchasecostofmotorcanberecoveredbysavingelectricityforoneyear;

2.directstartorspeedregulationwithfrequencyconvertercancompletelyreplacetheasynchronousmotor;

3.rareearthpermanentmagnethigh-efficiencyenergy-savingmotoritselfcansavemorethan15%ofelectricenergythanordinarymotor;

4.themotorpowerfactoriscloseto1toimprovethepowergridqualityfactorwithoutaddingpowerfactorcompensator;

5.themotorcurrentissmall,whichsavesthetransmissionanddistributioncapacitanceandprolongstheoveralloperationlifeofthesystem;

6.powersavingbudget:takingthe55kwmotorasanexample,thehigh-efficiencymotorsaves15%electricitythanthegeneralmotor,andtheelectricitychargeiscalculatedat0.5yuanperkwh.thecostofreplacingthemotorcanberecoveredbysavingelectricitywithinoneyear.

four、advantagesofhighefficiencymotor

1.directstart,cancompletelyreplacetheasynchronousmotor.

2.rareearthpermanentmagnethigh-efficiencyenergy-savingmotoritselfcansavemorethan3%ofelectricenergythanordinarymotor.

3.thepowerfactorofthemotorisgenerallyhigherthan0.90toimprovethepowergridqualityfactorwithoutaddingpowerfactorcompensator.

4.themotorcurrentissmall,whichsavesthetransmissionanddistributioncapacitanceandprolongstheoveralloperationlifeofthesystem.

5.thedrivercanrealizesoftstart,softstopandsteplessspeedregulation,andthepowersavingeffectisfurtherimproved.