Three-phase no-load current of 2.5 0.75 KW motor,what reason be

Two 0.75 KW..Grade 4...380 v...The motor..No-load current is between 2.3 to 2.6...Work environment textile factory..'a lot...Rated current of the motor is only 2.2...Normal no-load current is around 1.6..Time machine completely under ac electric motor the condition of no load over current...Due to the current big.So high temperature sharply born..Will soon..Overheating damage..Do not say the reason...thank you Problem complement: I thank two answer first..Disease,and together,the two are not normal before..In a few years later.You'll find the bad one current is increased.[.Repair of the motor are friends.Eliminate offline ribbon..] ...Until now,with or without load..

Motor current wholesalemotor.blogspot.com is bigger...Last year when the motor current in 2.0 A..Now 2.4-2.5 A...Motor shaft sleeve inside and outside in good condition...Have not completed...Don't go...Only electricity pilot time to run the old hot..Often the temperature in the 60-80 degrees...Wiring is right...Are the normal installation... There is a reason,is you pick the wrong wiring.380 v y connection.You make into 380 v delta connection.So,motor heat quickly.This is one magnetic generator of them.In addition,the machine is idle for a long time,must have certain load.If it is in use for a period of time after the scenario (excluding intervention had gone wrong),should be the result of mechanical failure.1 bearing damage increase torque resistance.Run 2 bearing outer ring,which leads to the bearing wear gaps (cover),the rotor eccentricity running and friction with the stator (boring),increase the electric motor 12v 500w torque resistance.What type of your motor,then measure the core size,what are you friends with line,around a few laps? I help you check it.Is estimated to be between winding insulation damage,it is recommended that you access the winding.

The analysis of the causes of 220 kv current transformer oil leakage and countermeasures

 To our factory after the high temperature in the summer of 220 kv current transformer oil 8500w gasoline generator leakage happened again and again,in my factory using the 220 kv current transformer,Ⅰ Ⅲ period switching station unimproved interval chosen are the products of the nanjing,cichang,four switching station and Ⅰ - Ⅲ switching station is interval with both hunan liling cichang the production of products.Product www.facebook.com/guohong.trading model are LB9-220,the whole sealing oil-immersed capacitive current transformer.Found in the run up to the defects of oil leakage phenomenon caused by untight seal,oil for a small amount of outdoor oil-filled electrical equipment are more 12v motor likely to cause equipment insulation parts be affected with damp be affected with damp,untight seal main insulation damage,causing more severe accidents,such as dielectric loss,the single phase electric motor excess oil chromatogram or explosion.Therefore,for small oil amount of outdoor oil-filled electrical equipment oil leakage defects timely processing,should be given enough attention in the work.

A,the structure of the three-phase asynchronous motor

A,the structure of the three-phase asynchronous motor,is made up of stator,rotor and other accessories. 1,the stator core Part of motor magnetic circuit,and placed on the stator winding.Structure:the stator iron core by 0.35 ~ 0.5 mm thick surface is commonly insulating layer of silicon steel sheet coining,overlying and become,within the core of the circle has a uniform distribution trough,which embedded in the stator winding.Trough the stator core has the following kinds:Semi-closed type slot:the efficiency and power factor of three phase generator the motor is higher,but the winding wire and insulation are more difficult.Commonly used in low-voltage motor.Half-open mouth slot:can put molding winding embedded,commonly used in large and medium-sized low-voltage motors.The so-called forming the windings can be treated with insulation in advance and then into the slot.Open rack slot:to put molding winding embedded,insulation method is convenient,mainly used in high voltage motor.2,the stator winding Access is the circuit part of the motor,three-phase alternating current (ac),to produce a rotating magnetic field.Structure:by the three in the space between 120 ° Angle,said arrangement can be connected with the same structure of the winding,the winding of the coil embedded respectively according to certain rule In electric motor laminations the stator slot.

The main of the stator winding insulation project has the following three:(guarantee between the

conductive part of the winding and iron core reliable insulation and reliable insulation between the winding itself).(1) of insulation:the whole and the stator winding insulation between the stator

core.Between diction and insulation:each phase of the stator winding insulation.(3) the turn-to-turn

insulation:each phase of the stator winding turn-to-turn insulation each wire.The motor terminal box

wiring:Motor terminal box has a wiring board,six of the three-phase winding thread in two rows,up and

down and from left to right are the three most wiring pile arrangement of the no.1 (U1),2 (V1),3

(W1),pile bottom three wiring from left to right to arrange the Numbers for 6 (W2),4 (U2),5 (V2),the

three phase windings into stars Connection or delta connection.All manufacturing and maintenance

shall be according to the serial number.3,stand Function:fixed ends and to support the rotor,stator

core and plays a role of protection,heat dissipation and so on.Structure:stand for cast iron

parts,usually large asynchronous motor base plate is commonly used in welding,micro motor frame

adopts cast aluminum.Enclosed machine stand outside Face with radiating rib to increase the cooling

area,protected on both ends of the frame of the motor end cover open vent,make motor inside and

outside air electricalmotor1.blogspot.com convection,can be directly to facilitate heat dissipation.

Not want to rely on single-phase motor startup phase shift can be starting capacitor?

That why some single phase motor as long as a capacitor operation. How to start? Single capacitance and single-phase capacitor motor small electric fan motor basic double with double values, the difference lies in the single-phase electric motor for double value just starting with the raised large and increase the starting torque capacity of capacitance, Starting when starting and running capacitors are connected to the www.facebook.com/guohong.trading motor winding, after perkins diesel generator set starting, starting capacitance disconnect, this task is performed by automatic centrifugal open, single-phase motor double value Commonly used in bigger starting power equipment, such as air compressor, etc...