Master electrical troubleshooting methods

Faults exclusion is an important work of maintenance personnel,to eliminate the fault,must know the cause of the failure,more important is can theoretically analysis,solve the fault occurred,should have certain professional theory knowledge,to permanent magnet generator master the methods of troubleshooting.(a) resistance test method:resistance test method is a commonly used method of measurement.Usually refers to the resistance using the multimeter,measure motor,lines,touch the top is in line with permanent magnet motors for sale the use of nominal value,and whether a method of on and off,or use the megohmmeter measuring phase phase,phase to the insulation resistance between the and so on.

Measurement,pay attention to the selection range and the accuracy of the check table,used by general resistance method is used to measure the general practice is to choose low first,when the circuit being measured should be paid more attention to whether there is a loop,and it is strictly prohibited to charged measurement.(2) voltage test method:test method is the use of multimeter corresponding voltage 12v motor profile,a method of measuring circuit voltage value.Usually measurement,sometimes measuring power source voltage,load,sometimes also measure the open circuit voltage,to determine the line is normal.Table should be paid attention to when measuring gear,choose the appropriate range,general measure is unknown or when the open circuit voltage usually choose ac voltage of the electricalmotor1.blogspot.com high-grade,to ensure that not in operation under high low voltage range,in order to avoid damage to the table.To measure dc at the same time,pay attention to the positive and negative polarity.

The analysis of the causes of leakage of transformer oil - packing quality

At the scene of the collapse of the transformer terminals can be electrical motor found at a time,leakage of oil terminal blocks most of fastening nut loose,install this doesn't mean that it electrical motor 24v did not tighten,with plane flange rubber gasket,for the first time after fastening tend to loose because of plastic deformation of the rubber gasket,need a second fastening.Transformer and our factory has been running for many years,there is no rubber gasket deformation problem,may explain why only is rubber gasket ageing lose elasticity,reducing the pressure on the surface of the flange connection.According to my years of experience in maintenance,air isolation rubber gasket to run more than ten years should not have what problem.Such as the transformer operation of our factory in nanjing,cichang has more than 20 years,did not find for porcelain set gasket electricalmotor1.blogspot.com aging oil leakage.Presumably liling porcelain production of transformer set gasket exist quality problems.

Motor common fault analysis and maintenance - the choice of the motor

1.According to the motor installed.Point of the surrounding environment to choose motor forms: rural common forms a protective type of motor and enclosed two kinds.Protection type ventilation performance is good,price is low,suitable for dry environment,place electrical motor USES less dust;If dirt is more,water splash,enclosed motor should be adopted.Such as agricultural and sideline products processing machinery and water pumps can be used in this kind of motor,in addition,there is a motor run capacitor sealed motor,bail can be immersed in the water work,this kind of motor electric submersible pump is adopted.2.According to use load condition,select the motor power: the power of the motor general should be in the production of electricalmotor1.blogspot.com mechanical power 1.1~1.5 times.If too much power to choose,not only to increase investment,but also reduces the mechanical efficiency,increase the cost of production.If power choice is too small,motor to bear too much load for a long time,can make temperature rise is too high and damage the insulation,shorten the motor to asynchronous motor make in life.3.According to the requirements of the machine speed motor and transmission way,speed and production machinery matching principle is to make the motor is running under the rated speed,the same way transmission.

The selection of ac contactor and operation maintenance

 (1) to electrical motor choose:(1) rated current of the primary loop contacts should be greater than or equal to the rated current,accused of equipment control motor contactor should also be considered the starting current of the motor.In order to prevent frequent operation of contactor main contact ablation,frequent movement of contactor rated current can reduce use.(2) the electromagnetic contactor coil rated voltage is 36 v,110 v,220 v,380 v,the electromagnetic coil allows within the scope of 80%~105% of rated voltage.(2) operation maintenance:(1) check in the operation of the project:1) by the load current is within the contactor ratings;2) contact points and the signal is consistent with the circuit state;3) running sound acmotortrading.blogspot.com is normal,have because poor contact and heat discharge;4) with or without electromagnetic coil overheating electromagnet short-circuit rings with and without exception.5) arcing cover any loose and damage;6) auxiliary contact with and without damage;7) transmission part with and without damage;8) have running environment without adverse factors of running around,such as too much vibration is too large,poor ventilation,dust,etc.

(2) maintenance:in electrical equipment maintenance work,to maintain the contactor shall work.1) external maintenance:a.external dust cleaning;B.check all fasteners are loose,especially the conductor connection parts,prevent loose contact and fever;2) contact system maintenance:a.check of dynamic and static contact position is,whether the three-phase closed at the same time,the contact spring should be adjusted if you have any questions;B.check contact wear,wear depth shall not be more than 1 mm,contact burning,welding off,must be change in time;When slight loss,generally does not affect the use.Clean the contact is not allowed to use sand paper,should use the plastic file;C.and measuring insulation resistance,electrical motor resistance of not less than 10 m Ω;D.check whether the auxiliary contact action is flexible,contact schedule should comply with the specified value,check whether there is any loose fall off on contact,found the problem,should be timely repair or replacement.3) maintain core parts:a.cleaning the dust,especially the moving parts,and between the core and interface;B.check the fastening situation of iron core,iron core run loose cause noise increase;C.core end ring have fall off or break to repair in time.4) electromagnetic coil maintenance:a.measuring coil insulation resistance;B.the coil insulation discoloration,aging,coil surface temperature should not exceed 65 ° C;C.check the coil wire small electric motors connection,if there are any open welding,burning loss should be timely repair.5) arcing cover parts maintenance:a.check whether the arcing cover is damaged;B.arcing cover any loose and location changes;C.remove arcing cover gap within the metal particles and sundry.


(3) working principle of the vacuum contactor,vacuum contactor with vacuum arcing medium,its main contact seal in a special vacuum arcing tube.When operating coil electricity,armature,absorption in the contact spring and vacuum tube autistic force under the action of contact closure;Operating power coil,the armature reaction spring overcome vacuum tube autistic force release,off contact.Contactor breaking current,the contact gap formed by metal vapor can be formed in the platinum scale,affect the service life of the contactor.

Single-phase capacitor motor operation,do not run capacitor can turn,? What it up yesterday?

Single-phase capacitor motor operation,do not run capacitor can turn,? What it up yesterday? Capacitor is used to split phase,the purpose is to make two spare set of the current produce nearly 90 ゜ phase wholesalemotor.blogspot.com difference,in order to produce a rotating

magnetic field.Three-phase electricity,each current itself has a phase difference between two

phase,there is no split phase.Start capacitor as acmotortrading.blogspot.com a

start.Running capacitor to improve the power of the machine.If don't running capacitor can also turn?

Or perkins diesel generator set a smaller power?Single-phase motor in operation,and

capacitance is not can be removed.He is vice winding magnetic field,remove the induction

motor running capacitor if during motor operation,a little bit more motor with load will stop.

Three-phase asynchronous motor

As a motor running of three-phase asynchronous motor.Three-phase asynchronous motor rotor speed is lower than the speed of the rotating magnetic field,rotor winding due to single phase ac motor 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 to the different rotor structure,three-phase asynchronous motor can

be divided into the cage and winding type two single phase asynchronous motorkinds.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 5kw permanent magnet generator rotor and stator www.dongfeng-motor.com 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.

220V YCL high torque low rpm electrical motors single phase asynchronous water pumps run and start capacors IE1 IE2 CE GOST

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