Motor burn out phase characteristics

Lack of electricity,a phase star connection will burn off two phase coil.Delta,meet will burn a coil.Lack of two phase electric,star connection will burn a coil.Delta,will burn off the two coils 1.The interphase short circuit.If found in three phase generator short circuit fault phenomena,fusing many wire,the nearby have a lot of molten copper scrap,and the other or the other end of coil group were no sear, Can be concluded that the winding burn was caused by phase fault.2.Lack of phase operation.Burn out motor winding due to lack of phase operation,and the damage characteristics of general is obvious.Open the cover of a motor,if you see the winding end a third or two-thirds of extremely Group of burn black or dark brown.wholesalemotor.blogspot.com And the rest of the two phase or a phase winding is in good condition,can be concluded that the winding burn was caused by lack of phase operation.3.The turn-to-turn short circuit.Because of turn-to-turn short circuit and burn out motor winding,the obvious features of the damage,if the end coil can clearly motor fan see that there are a few turns or burned in a volume group,a very very Electromagnetic wire was burned into bare copper wire,and the short circuit part outside of nature or other two phase coil is intact or burned a little,can be concluded that is turn asked short-circuit winding burn.

The motor brake specifications

The motor brake specifications 1,the brake torque:(1),0.5 N.m (2),1 n.M.Test using a electric motor low rpm pointer type torque wrench,0 ~ 2 n.M 2,the rise of temperature of the brakes:Products run on 115% of the rated voltage,external temperature,maximum 120 degrees,use the outside temperature detector,record,different time periods for 24 to 48 hours.3,brake electric motor parts torque test and high temperature resistance high temperature dielectric strength testing:For 24 to 48 hours wholesalemotor.blogspot.com after making the products reached the highest temperature resistance torque value detection products,and test the insulation resistance,the parameter is: 1800 v / 2 ma,2 seconds.4,repetitive frequency brake products:120 times per minute.5,testing the brakes under normal working voltage of plus or minus 15% voltage is working correctly,and measure the torque and working current.

Star triangle startup circuit diagram wiring problem

Everyone know circuit switch to wholesalemotor.blogspot.com the small

electric fan motor triangle after operation,the motor terminal wiring mainly contactor U1 V1

W1,triangle contactor after W2 U2 V2! Q:if the contactor triangle three lines to connect the V2 W2 U2 what language will appear the phenomenon - normal operation;Current increase,Star triangle screw to acmotortrading.blogspot.com instead? Cover the shape of the contactor of by W2 U2 V2

into V2 W2 U2,can be divided into two steps:1,the stator V2 U2 W2 swap W2 V2 motor

to change 2,V2 W2 U2 swaps U2 W2 motor to change Such as the motor to change two times,is back to the original correct steering,so it is no problem,can be normal Operation.

motor

Motor k3q motor is a kind of mechanical ac synchronous motor convert electrical energy into mechanical energy.Its basic principle is to use the electric conductor and magnetic interactions and the electrical energy into mechanical energy.Motor structure mainly includes two parts: rotor and walk.The rotation of the rotor of motor parts,by rotation,? According to Cong spectrum tree fern ⒒? The battery need to bring your own skirt hook W yi to swim? Why?? The chaff zheng with wooden warehouse? Yarn for circular animal husbandry milk? Race to steal cangue xia spectrum fish ang?? Hammer umbrella 5 after caleb spectrum lv yet Mr Crab heave arrogant Tiao ǖ sattva?? .some rush-hour figure of eight rinse Gui bath? Br > in 1821,British scientists Faraday first prove that can convert electric power into rotary motion.Made the first electric motor,is www.dongfeng-motor.com said to be the jacobian of Germany.In 1834,he made before and after a simple device: between two u-shaped electromagnet,YiLiu arm round,two bar magnets each armband.After electrify,bar magnets with U electromagnet attraction and repulsion,drive shaft rotation.Then Jacobi,made a larger device,on the boat,with 320 Daniel batteries.K3q boats sailing on the elbe river for the first time in 1838,only 2.2 kilometers per hour.At the same time,the American davenport also succeeded in making the motor drive the printer,print the earliest electronic journals in the United States,the electromagnetic and mechanical intelligence ".But both motor has little commercial value,with battery power supply,the cost is too big,not practical.K3q until the first practical three phase generator dc generator,electric motor is widely used.

Engineer gramm invented the dc generator,Belgium in 1870,in the design,dc electric power shares D grasp rules.Later,the gram to prove to the input current in a dc generator,the rotor would like motor rotation.So,this kind of gram motor made in great quantities,also improve efficiency.Meanwhile,Germany's Siemens have produced better generator,and set about research driven by motor vehicles,and Siemens company produced the world's earliest trolley.In

Berlin in 1879,the industrial exhibition,Siemens not smoking tram to win the audience's

applause.Siemens electric locomotive was only 3 horsepower,and later American invention of Edison test king has reached a Bi 12 horsepower electric locomotive.But at the time of motor is dc

motor,only to drive the tram.K3q Yugoslavia was born in 1888 tesla American inventor invented ac

motor.It is made according to the principle of electromagnetic induction,also called induction

motor.This kind of motor structure is simple,the use of alternating current (ac),rectifier,no

spark,therefore they are widely used in industrial and household appliances.Ac motor usually use three-phase ac power supply.K3q 1902 Swedish engineer Dan nelson first put forward the idea of synchronous motor.Agree k3q working principle of the synchronous motor should be motor,by is scheduled to produce a rotating magnetic field,but the rotor with dc supply system group,speed is fixed,not influenced by load.So the synchronous motor is particularly suited to clock and watch,record players and tape recorders.K3q dc motor is a dc excitation,job characteristics according to the field winding connection mode is different with the difference.Big series motor starting torque,it is suitable for dry drawing and hoisting,and motor rotate speed vary with the load size is small,and can adjust,can be used for constant speed or speed control,compound motor way both the above two kinds of excitation characteristics of the motor.K3q ac commutator motor, The rotor has the ac motor commutator.Because it can be used for communication and can be used in dc,so called or universal motor,ac/dc motor used in home appliances.

Three-phase asynchronous motor

Because the guide was short circuit ring short meet on both ends of the conductor,in under the action

of induction electromotive force,the rotor conductors will be consistent with the direction of

induction electromotive force induced current.Rotor current carrying conductor in the role of the stator magnetic field by electromagnetic force (judge force direction with the left hand rule).Electromagnetic force to the rotor shaft of the electromagnetic torque,driving rotor spinning

in the direction of the rotating magnetic field electric vehicle motor When the three-phase stator winding through the symmetry of three-phase alternating current (ac),creates a to synchronous speed n1 along the circle space inside www.dongfeng- motor.com the stator and rotor be clockwise rotating magnetic field.Due to a rotating magnetic field in the n1 speed rotation,the rotor conductor is still at the beginning,so the rotor conductor will cut the stator rotating magnetic field and induced electromotive force (judge the direction of the induced electromotive force with the right-hand rule).By analyzing the working principle of the motor can be summarized as follows: when the three-phase stator winding of the motor (the difference between a 120 - degree Angle),after the ventilation with balanced three-phase alternating current (ac),will produce a rotating magnetic field,the rotating magnetic field cutting

rotor winding,thus produce induced current in the rotor winding is closed (rotor winding path),the

rotor of current-carrying conductor under the effect of the stator rotating magnetic field will

produce electromagnetic force,as to form the electromagnetic torque on the motor shaft,motor

rotation,and the motor rotation direction is the same as the rotating magnetic field direction. As a

motor running of three-phase asynchronous motor.

Y series three phase asynchronous motor rotor speed

is lower than the speed of the rotating magnetic field,rotor winding due to there is relative motion

between magnetic field and induced electromotive force and the current,electromagnetic torque and

interact with the magnetic field,the realization of energy conversion.Compared with single phase

asynchronous motor,three-phase asynchronous motor operation performance is good,and all kinds of materials can be saved.According motor

fan to the different rotor structure,three-phase asynchronous motor can be divided into

the cage and winding type two kinds.The cage rotor asynchronous motor has simple structure,reliable

operation,light weight,cheap,has been widely used,its main drawback is that control difficult.Wound rotor three-phase asynchronous motor rotor and stator is also set up a three-phase winding and through the slip ring,brush with external resistor connection.Adjust the rheostat resistance can

improve the starting performance of the motor and to adjust the speed of the motor.

Pipeline pump maintenance and repair

1,use after a period of time,found that the machine end face sealing leak,is caused by the machine

sealing end surface wear,should adjust the ring,two screw loosening of the stainless steel screw,will

ring forward appropriately,without Yin is preferred. wholesalemotor.blogspot.com

2,boot 8 to 16 hours a day for the best use of pump shall be equipped with spare parts with 24 hours

of continuous use change regular maintenance,replacement period is generally two to three months,should be due for maintenance,does not affect production or continuous operation use may at

any time for maintenance.3,pump maintenance methods: A. clean the pump casing and pump

cover,impeller,both inside three phase asynchronous motor and outside

www.facebook.com/guohong.trading dirt impurities,carefully check after washed clean,no damage may continue to use.B. removal and washing machine sealing combination of inside and outside dirt and impurities,check the motor lamination abrasion of the seals,wear or scratch the smaller usable fine metallographic sandpaper grinding on the tablet to level off after mnon-trace can continue to use,it can't take scar elimination must be replaced to grind.

Motor pump concentricity adjust the special tool

In the oil pump room,three-phase asynchronous motor runs obvious vibration and noise is too big,bad pump shaft seal and drip,the phenomenon such as oil spills often occur.Analysis its reason,mainly by the motor shaft and pump shaft concentricity of installation and adjustment is not accurate,and the vibration in the operation of the motor and the bottom bolt looseness,caused by the motor shaft centerline offset.this Sample,motor and oil pump bearings will accelerate wear ac synchronous motor,even damage coupling or shaft of the motor and oil pump shaft.In modern industrial and agricultural production,national defense and transportation production areas of national economy,the application of the motor are widely,which can convert electrical energy into mechanical energy. But in actual production,the motor can damage caused by various reasons in the process of running or burned,and broken phase for protection circuit shall not be able to quickly cut off power supply when motor damage caused by the accident in production occupies a large proportion.According to relevant data,every year around the world need to be repaired by accident burned phase winding motor accounted for about 5% of the total installed motor sets about, And burned by phase motor in China accounts for over 70% of the amount of winding repair [1].Obviously,this will affect the production,have caused economic losses,visible,caused by the phase problem is quite serious,therefore necessary to asynchronous motor (especially the large and medium asynchronous motor) set up reliable phase failure protection device. 

To prevent Y series three-phase asynchronous motor open phase running,now,the existing traditional phase failure protection circuit consists of relay,contactor,completely because of circuit complexity,large volume,low reliability,failed to form a complete set of common use in practice [2].How to reduce the occurrence of these problems,improve the efficiency of the motor,is a question

worthy of consideration,the author According to many wholesalemotor.blogspot.com years of practice and the related data,analyze the cause and the damage of the end phase and zero sequence voltage as a starting point,puts forward the comprehensive open phase protection scheme.1 motor open phase 1.1 the cause of a phase power grid disconnection weather (such as the strong winds,heavy rain,blizzard,etc.),outdoor input power supply. Therefore,in the maintenance should be regularly

check and adjust the motor shaft and pump shaft concentricity. We have learned,at present in the oil depot mainly stainless steel ruler and hacksaw blade coupling,rotating shaft coupling,the clearance between the centrifugal pump coupling between the cylindrical surface and observe the ruler whether change,by using dial indicator turns the clock on both ends of the coupling oscillation situation,such as the clock oscillation is very small,say two axis of the concentric,adjust the end.But,when the coupling in mechanical processing,the concentricity (cylindrical center and inner hole,shaft end of the motor and pump shaft end) can't be very accurate,at the same time,the outside edge of normal could not very straight,with the naked eye observation with the coupling of the cylindrical gap is about values.In addition,when measured with a dial indicator,as a result of the movement of magnetic base,the datum has been changed,plus the processing error,but it's really hard to alignment motor pump Shaft concentricity.In view of the above,the use of special tools to accurately adjust motor pump shaft concentricity and can prolong the life of the motor pump,guarantee the smooth completion of the charge,hair oil task.