Machine tool equipment electrical troubleshooting,repair and matters needing attention

When find out the fault point electrical equipment,will begin to repair,commissioning,records,etc.,and then consign is used,but must pay attention to the following items:1.Find out the fault point and repair failure,can't find the fault points should be paid attention to as a search for the end of the fault must be further find out the root cause of the failure analysis.2.After find out the fault point,must according to different fault condition and the location corresponding to the correct repair method.3.In the repair work of fault point,under normal circumstances should electrical motor try to be recovered.4.Electrical fault repair finished,need electricity commissioning,cooperate with the operator,to avoid new failures.5.Every time after troubleshooting,should be timely sum up experience,and completes the maintenance records.

Records include: industrial machinery model,name,number,generator generator set the date of the failure,failure phenomena,parts,damage of electric appliance,the cause of the problem,after the repair measures and repair operation,etc.Record purpose: as a file as a reference for future maintenance,and through the analysis of all previous failures,take the corresponding effective measures to prevent similar accidents from happening again or improvements for the design of the electric equipment itself,etc.There is a bridge to communicate at a factory crane (model: PQR6-100 s capacity of 5 t),in operation,the crane upgrade machine (model: YZR225M an 8,2 kW) abnormal whistlers.Judgment is a gasoline generator mechanical failure at first,then check the gear bearing and gear shaft,result in good condition,will load disconnect,the motor idling,screaming.


Judgment is to slow down the helical shaft bending in the cabinet,check the deviation within the rules.In desperation,the collapse of the motor,the motor is in good condition,core without friction marks,check the collector ring and brush.Resistance box (resistance box for wound rotor concatenated variable resistance) are in good condition.Disconnect the wound rotor of variable resistance,electric test,squeaking wholesalemotor.blogspot.com noise elimination.Prove that the motor is on the rise,the variable resistance of the rotor circuit concatenated resection,relay is measured with table,found that dc delay relay (T3-11/1-110 - v) normally closed contacts ILSJ (circuit as shown in figure 1) death.If it can't disconnect in time,as the grab rose control variable resistance of ac contactor coil 1 JSC,3 JSC,SJSC suction,the main contactor 1 JSC,2 JSC,JSC all closed,wound rotor concatenated variable resistance of all the work.Replace the dc timing relay,fault be ruled out.

watt

 The power unit of the international system of units.Watt is defined as 1 joule per second (1 j/s),namely every second transformation,use or dissipation (in the) of joule for measurement of the rate of energy. In the electrical electric fan motor system of units,the volt by ampere (V (A).More commonly used in everyday life-kw as a unit,1 mw = 1000 watt.Unit conversion: watt by a British scientist to make a significant contribution to the development of the steam engine was named after James watt.The name of the entity in the first 1889 adopted by the 2nd meeting of the British association for the advancement of ac induction motor 110kw science.In 1960,the international conference on measurement 11th meeting in watts of power in the international system of units (units.People commonly used power unit multiplied by the unit of time to represent the energy.For example,1 kw? R is a power of 1 kw of energy consumed energy wholesalemotor.blogspot.com consumption equipment in 1 hour,is equal to 3.6 million joules.The commonly used formula W = UIT; W = P * T Network watt is small electric motors English words on the water (water).Such as the brain watt,it means that thinking."W" and "bad" in the Shanghai dialect pronunciation similar.

Early study of permanent magnet synchronous motor

 Early study of permanent magnet synchronous motor mainly in fixed frequency power supply of the working characteristic of the permanent magnet synchronous motor research,especially the research of steady-state characteristics and direct starting performance.Permanent magnet synchronous motor starting directly depend on damping windings provides asynchronous torque motor speed up to close to synchronous speed,and the magnetic resistance torque and torque will be synchronous motor pull in sync.V.B.H onsinger and M.A.R ahman et al.A lot of research work has been done in this single phase capacitor start induction motor respect.In the eighty s,foreign to inverter power supply of permanent magnet synchronous motor for further research.Inverter power supply of permanent magnet synchronous motor with direct starting of the structure of the permanent magnet synchronous motor are basically the same,but in most cases without damping windings.Damping winding has the following characteristics: first,damping winding to generate heat,make the permanent magnet temperature rise; Second,increase the moment of inertia,damping winding motor moment of inertia ratio decline; Third,the tooth of the damping winding make pulsating torque increases.In inverter power supply situation,it will affect the original characteristics of permanent magnet synchronous motor,the steady state and transient characteristic of permanent magnet synchronous motor with a constant frequency compared with different features.

A large number of papers published after 1980 study the mathematical model of permanent magnet synchronous motor,the steady state characteristics,dynamic characteristics.A.V.G umaste research such as the voltage type inverter power supply of permanent magnet synchronous motor steady state characteristics and the current type inverter power supply of permanent magnet synchronous motor steady-state characteristics.With the constant improvement of the permanent magnet synchronous motor speed control system performance requirements,the perkins diesel generator need to design high efficiency,high moment of inertia ratio,high energy density of permanent magnet synchronous motor,G.R.S lemon and others diesel generator for speed control system dynamic performance and high efficiency requirements quickly,modern design method of permanent magnet synchronous motor is presented.With the development of microcomputer technology,permanent magnet synchronous motor vector control system of full digital control also has made great development.D.N aunin a permanent magnet synchronous motor is developed,such as right amount control system,using a 16 bit single chip microcomputer 8097 as control computer,realizes the high accuracy,high dynamic response of full digital control.

In the late eighty s,early ninety s B.K.B ose and published a large number of permanent magnet synchronous motor vector control system of full digital control of the paper.Speed controller of permanent magnet synchronous motor vector control system usually adopts proportional integral (PI) control.PI controller has a simple structure,good performance and is not sensitive to controlled object parameters change,etc.In 1991,R.B.S epe adopts self-tuning control in the speed controller for the first time.Early adaptive control is mainly used in dc motor adjustable beam system.National Taiwan university tian-hua liu and so on for the first time the robust control theory is applied to permanent magnet synchronous motor servo drive.Motor in the process of running,the model and the parameter is constantly changing,the change of the parameters and model will cause to reduce the performance of control system.All kinds of robust control technology in modern control theory to make the control system in the model and parameter changes to protect the good control performance.Will,therefore,all kinds of robust control technology used in motor speed regulation,can greatly improve the performance of speed control system.In this regard,the use of more successful control technology mainly include: adaptive control,variable structure control,parameter identification technology,etc.

What's short for current transformer of the TA?

 Voltage mini electric motor transformer - Potential transformer,abbreviated as PT.The Current transformer,Current transformer,abbreviated as CT.CT is a noun,refers to the current transformer.PT is a noun,refers to the voltage transformer.TA is a code,the generation refers to the current transformer,TV is a code,generator stator the generation of voltage transformer,TA,TV for secondary figure generation refers to the current,voltage transformer,is corresponding with the old standard LH,YH. Voltage or current transformer in proportion to transform electric motors 12 volt of equipment.

Divided into two major categories of voltage transformer and current transformer.Transformer features are: high voltage or high current in proportion to transform into standard low voltage (100 V / 100 V) or small current standard (5 a or 1 a,referring to the rated secondary rated current),in order to realize the measuring instrument,the standardization of protection equipment and automatic control equipment,miniaturization.In addition,the transformer can www.facebook.com/dongfeng.motor also be used to isolate the high voltage system,to ensure the safety of person and equipment.According to the needs of power system,the transformer is divided into independent type and equipment form a complete set with two kinds of casing

The generator brush sparks the cause of the problem is?

1,brush current density is too large.In the actual operation,if one or two brush jamming due to

mechanical trouble,lack of spring pressure don't output,in order to maintain the normal load,by other brush of current will increase,if there are in the increasing flow of the brush the slant of the

brush,because with the slip ring contact area is reduced,surface flow density increases.According to Q = I * IRT,calorific value and is proportional to the square of the current,the accumulation of heat to send out,the temperature rise sharply,the brush and slip ring interface can produce sparks.Also spark,after the creation of the brush work environment more bad,so a vicious circle,make brush sparks more serious,a few have this severe cases will occur when the three phase induction motor ring of fire.2,uneven brush pressure,or do not conform to the requirements.

Brush factory manufacturers are related: brush spark does not occur to the lowest pressure,pressure adjustment go through scientific argumentation and practice summary,minimum pressure generally is 200 ~ 300 ㎡ ɡ / c,is 0.02 ~ 0.03 MPa,the pressure between each brush also wants even,its difference is not more than 10.The generator in the long run if a brush friction are too short,or brush in the brush frame www.dongfeng-motor.com delay CARDS,pressure will be uneven.Moreover by machinery,heat soft spring itself and other factors affect the pressure can not meet the brush doesn't happen spark theory of minimum requirements.And we are compaction,tyra carbon brush,sometimes feel,no accumulation of experience,operating error is very great.3,the surface of the brush is not clean.

This is the most let people ignore,normal operation of the generator brush seal inside the airtight cabinet,there are set on the shaft gear shape among the poles brush axial flow fan,depend on rotor rotating grinding of graphite carbon powder,heat away in time,brush to clean ac geared motor the cooling effect.If the cupboard door closed lax,or forget to close the door,when checking out the dust with the hot air into the brush,brush attached to the column,on the one hand brush heat dissipation.On the other hand brush spark occurs due to brush the column surface impurity,brush column insulation strength between ring fire easily.Besides slip ring on have spiral groove,this is in order to increase the brush the cooling area,improve with brush contact,makes the brush more fully cooling,at the same time are more likely to make carbon powder.If cupboard door closed lax,lack of draught fan outside dust very easily also adhere to the spiral ditch,consequences was palpable.Excitation single phase capacitor start induction motor electrical and mechanical brush consider its bare outside,the lower voltage level in this also suggests the maintenance regularly clean.A few days ago excitation brush sparks was forced to stop incidents happened in our factory,the reason of many sided,often small disaster.We should cause enough attention.

The working principle of motor

Motor (Motors) is a device converts electrical energy into mechanical energy.It is using electric coil (that ac electric motor is,the stator winding) to diesel generator produce a rotating magnetic field and try to turn the mouse cage form magnetoelectric dynamic rotating torque closed aluminum frame.Motor by using the power divided into dc motor and ac motor,electric power system in most of the motor is ac motor,can be synchronous motor or induction motor (motor stator magnetic speed diesel generators prices and rotor rotating speed is not synchronized rate).Motor is mainly composed of stator and rotor,the direction of motion of the wire in the magnetic field force with the direction of current and magnetic induction line in the www.dongfeng-motor.com direction of magnetic field direction.Working principle of the motor is a function of magnetic field on the current stress,to rotate the motor.

Motor nameplate data and rating

Motor nameplate data and rating Model: the series of varieties, the performance of the motor, protective structures, such as rotor type product code. Rated power: it means the runtime on the output mechanical power rating of the motor shaft, unit KW or HP, 1 HP = 0.736 KW. Voltage: directly to the line on the www.dongfeng-motor.com stator winding voltage (V), the motor has two kinds of Y and delta connection, the connection shall be consistent with connection of regulation of motor nameplates, to ensure that corresponding to three phase generator the rated voltage. Current: motor under rated voltage and rated frequency, and the output power rating of the stator winding current of three-phase line Frequency motor, which refer to connect ac power frequency, regulation of 50 hz + 1 in our country Speed: motor under the rated voltage, rated frequency, rated load, motor speed (r/min) per minute; The 2 pole motor synchronous speed is 2880 / min. The duration of the work quota: refers to the motor running. Insulation class: the level of motor insulation materials, decided to allow temperature rise of the motor. Standard number: said design motor technical documents basis. Excitation voltage: refers to the synchronous motor excitation voltage (V) when the rated work. Field current: refers to the synchronous motor excitation current (A) when 8500w gasoline generator the rated work.