Induction motor drive system

Asynchronous motor is characterized by simple structure,strong and durable,low cost,reliable operation,low torque ripple,low noise,do not need to position sensor,high speed limit.Induction motor vector control speed regulation technology is mature,the asynchronous motor drive system has obvious advantages,so the earlier was applied in electric vehicle drive system,the current is three phase induction motor still the mainstream of the electric vehicle drive system products,but have been other new type of brushless permanent magnet traction motor driving system is gradually replaced.Biggest disadvantage is that driver circuit is complex,high cost;Relatively permanent magnet motor,induction motor efficiency and power density is low.

2.The brushless permanent magnet synchronous motor drive system Brushless permanent magnet synchronous motor can use cylindrical radial magnetic field structure or disc axial magnetic field structure,due to the power density and high efficiency and magnet prices wide speed range,development prospect is very broad,is a strong competitor in the traction motor of electric vehicle,had been used in a variety of electric vehicles at home and abroad.Built-in permanent magnet synchronous motor,also known as hybrid permanent magnet reluctance motor.The motor on the www.dongfeng-motor.com basis of the permanent magnet torque superposition of the magnetic resistance torque,the existence of the magnetic resistance torque to improve motor overload capacity and power density,and easy to weak magnetic speed regulating,expanding the scope of the constant power operation.Built-in permanent magnet synchronous motor drive system design theory is increasingly perfect and further,with flexible structure,design degrees of freedom,is expected to get high performance,suitable for electric cars,high efficiency,high density and wide speed traction drive.

These cause the attention of the peers in the major car companies,especially the Japanese car company colleague's favor.At present,the American car companies peers in new model design mainly USES the built-in permanent magnet synchronous motor.generator stator Surface;also called permanent magnet

torque motor type permanent magnet synchronous motor,against the built-in permanent magnet

synchronous motor,its weak magnetic speed range is small,low power density.The structure of the motor dynamic response is fast,and is expected to get low torque ripple,suitable for used in automobile electronic servo drive,such as automotive electronic power steering servo motor.Sensorless permanent magnet synchronous motor drive system is currently a hot topic in the research of permanent magnet synchronous motor drive system,will become the development trend of the permanent magnet synchronous motor drive system is one of the potential competitive advantage.Permanent magnet synchronous motor drive system often adopts vector control at low speed,high speed with weak magnetic control.

Motor speed control method

Motor speed control method are many,can adapt to the requirement of different changes in the rate of production machinery.General motor adjustable electric motors price motor Motor

speed when the output power will change with the rotational speed.From the perspective of energy

consumption,speed can be roughly divided into two kinds:(1) the input power.By changing

acmotortrading.blogspot.com the diesel generator speed regulating

device of energy consumption,adjust the output power by adjusting the rotational speed of the motor. (2) to control the motor input power to adjust the speed of the motor.Motor,motor,brake

motor,frequency electrical motor conversion motor,speed motor,three-phase asynchronous motor,high voltage motor,multi-speed motor,two-speed motor and explosion-proof motor.

Adaptive control technique can send control objects and operation

Adaptive control technique can send control objects and operation condition change the performance of

the control system,N.M atsui,J.H.L ang et adaptive control technology was applied to permanent magnet

synchronous motor 220v ac electric motor sspeed control system.Simulation and experimental results show that the adaptive control technique can make the speed regulation system in the motor parameters change to keep good performance.Sliding mode variable structure control due to its special way of"switch"to control and motor speed control system of inverter are of a similar"switch"model and has good robust control properties,therefore,has a broad application prospect in the field of motor control. Online identification through change of motor parameters,and using the identification parameters for control of www.facebook.com/guohong.trading the speed regulation system,can improve the robustness of control system.

With the development of artificial intelligence technology,intelligent control has become an important branch in the field of modern control,used in electric drive control system of intelligent control technology has become induction motor price the main direction of electrical drive control,and will bring a new era of electric drive technology.At present,the effective ways to realize the intelligent control has three: based on the expert system of artificial intelligence (ExpertSystem);Fuzzy control based on fuzzy set theory (FuzzyLogic);Based on artificial neural network (Artificia1NeuraNetwork) neural control.B.K.B ose and others from the late eighty s,has been committed to the application in the field of artificial intelligence technology in 220v ac electric motors the electric transmission,and achieved gratifying results.

ac motor vector transformation control

In 1971,the scholars have put forward the ac motor vector transformation control of new thoughts,new

theory and new technology,its emergence of ac motor control technology research is of epoch-making significance.Because of this through the field-oriented vector transformation of exchange closed loop control system,its control performance can be comparable with the dc system completely.Then,with the power electronics,microelectronics,computer technology and the development of permanent magnetic

material science,the vector control technology application and popularization rapidly.Vector control is in the unified theory of electromechanical energy conversion,motor and developed on the basis of space vector theory,it first used in three-phase induction motor,soon extended to three-phase permanent magnet synchronous motor.Due to the operation of the three-phase induction motor,the rotor heat causes the rotor parameters,and the rotor magnetic field observation depends on the rotor parameters,so the rotor magnetic field is difficult to accurate three phase induction motor observation,make the actual control effect is difficult to achieve the result of theoretical analysis,this is the deficiency of vector control in practice.

The permanent magnet synchronous motor with permanent magnet rotor,parameters are fixed,so the vector control of permanent magnet synchronous motor has been widely applied in low power and high precision.Then,in 1985 permanent magnet motors for saleby Germany ruhr university ockMr.Professor Depenbr first advanced the theory of direct torque control,and then turn it to weak magnetic speed range.Compared with vector control technology,the direct torque control is largely solve the characteristics of the three-phase induction motor vector control is affected by the motor parameters change the problem.Direct torque control was born,in his novel control thinking,system structure of simplicity,good static and dynamic performance has received the widespread attention and got rapid development.At present this technology has been successfully used in the high-power ac drive electric locomotive traction.Germany,Japan,the United States are racing to develop the new technology [3] [4].After the 1990 s,with the wholesalemotor.blogspot.com development of microelectronics and computer control technology,high speed,high integration,low cost and the commercialization of the advent of the microprocessor made it possible to fully digital ac servo system.

Through the microcomputer control,can make the motor speed control performance has greatly

improved,making complex vector control and direct torque control,greatly simplifies the

hardware,reduces the cost,improve the control precision,also can have protection,display,fault

monitoring and diagnosis,the debugging and the reset function.In addition,the change control

strategy,revision control parameters and model also becomes simple,thus greatly improve the

flexibility,reliability and practicability of the system.In recent years,in the advanced digital ac

servo system,many companies have introduced a special chip for motor control.Can quickly complete the system of speed loop,current loop and position loop fast precision adjustment and complex vector

control,to ensure the algorithm for motor control,such as direct torque control and vector

control,neural network control,can the completion of high speed and high precision.Nonlinear

decoupling control,adaptive control,artificial neural network model reference single phase capacitor start induction motor adaptive control,the control and the state

observer and linear quadratic integral control and fuzzy intelligent control and so on all kinds of

new control strategies are constantly emerging,show more III broad prospects.Therefore,the use of

high-performance digital signal processor intelligent digital ac permanent magnet servo control

system is one of the important development direction of ac servo system.

The maintenance of construction machinery used in motor brush?

(1) brush label shall comply with the working characteristic of motor,shall not be used on 1 electric

motor brush two different symbols.(2) there should be no shaking of the brush in the brush and

stagnation phenomenon,brush and brush holder should 220v electric motor be 0.10 ~

0.20 mm gap between brush edge to the slip ring or distance on the surface of the commutator with 2 ~

4 mm advisable.(3) the brush and the connection of copper braid,the connection of copper braid and

brush holder shall be ensure good contact perkins diesel generator and secure. Copper braid shall not and motor rotational part to touch or touch shell grounding.(4) the brush on the slip ring or commutator pressure numerical should comply with the regulations of brush label and

manufacturing plants,or adjust to the lowest pressure,no sparks in general is 0.15 ~ 0.25 KGF/cm~2 (5) brush wear IE2/IE3 electric motor degree,shall not be more than two-thirds of

the original standard height.(6) after brush wear,should be replaced by the original label,and will contact with glass sand,make www.dongfeng-motor.com the contact area of not less than 75%.

motor

Motor (Motors) are the devices that converts electrical energy into mechanical energy,it is using electric coil in three phase induction motorthe magnetic field stress rotation phenomenon,which distributed in each user,motor by using the power divided into dc motor and ac motor,electric permanent magnet motors for salepower system in most www.dongfeng-motor.com of the motor is ac motor,can be synchronous motor or induction motor (motor stator magnetic speed and rotor rotating speed is not synchronized rate). The motor is mainly composed of stator and rotor. Direction of rotor and statormotion of the wire in the magnetic field force with the direction of current and magnetic induction line in the direction of magnetic field direction.

Motor nameplate data and rating

Model:the series of varieties,the performance of the motor,protective structures,such as rotor type rotor and stator 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 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 the rated voltage.

Current:motor under rated voltage and rated frequency,and www.dongfeng-

motor.com the output power rating of the stator winding current of three-phase line Frequency motor,which refer to gasoline generator spare partsconnect the ac power frequency of 50 hz+1 Chinese regulations Speed:motor under the rated voltage,rated frequency,rated load,motor speed (r/min) per minute; The generator stator 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 the rated work.

High efficiency motor energy saving effect is remarkable Huge market upside

Efficient motor is refers to the general standard motor has high efficiency.Efficient motor using new motor design,new technology and new materials,by reducing the wastage of the electromagnetic energy,heat energy and mechanical energy,improve the output efficiency.Compared with the standard motor,motor using efficient energy-saving effect is very obvious,normally efficiency can be increased by 4% on average.Figures show that China's industrial production of energy waste is serious,the motor power consumption accounts for 64% of the total electricity consumption in our country,based on the analysis of domestic motor application,most still ac electric motor is given priority to with ordinary motor,represented by efficient motor energy saving products market space is huge.Efficient motor is refers to the general standard motor has high efficiency.Efficient motor using new motor design,new technology and new materials,by reducing the wastage of the electromagnetic energy,heat energy and mechanical energy,improve the output efficiency.Compared with the standard motor,motor using efficient energy-saving effect is very obvious,normally efficiency can be increased by 4% on average.

Statistics show that's about 1.7 billion kilowatts,annual power consumption of about 3 trillion KWH,motor power consumption accounted for 64% of China's total power consumption,industrial electricity 75% efficient motor in domestic existing stock motor proportion less than 5%,the production of high efficiency motors are mainly sold to electric motorforeign countries.At the same time,the application of highly efficient motor in China at present is only 23% ~ 23%.Although our country in 2008 will be included in motor system energy saving country one of the ten major energy conservation projects,www.dongfeng- motor.com 2009 also include high efficiency,super efficient motor application in huimin engineering,June 2,2010,according to the notice will be highly efficient motor in energy-saving products huimin project scope,make efficient motor marketing focus.Embarrassing situation is that the high efficient motor has promotion on the market for many years,high efficiency motor has not fully integrated into the market,at present efficient motor proportion is still relatively low.Efficient motor research and development in our country basic keep pace with the international level,the technical progress in recent years,very optimistic,especially on the motor efficiency and abroad there is no difference.

But it is a pity that our country produce IE3 motors domestic application of too little,most for export.Domestic well-known motor expert member of ren-yuan tang said.Statistics from the ministry of industry and information technology,according to the current domestic with motor in efficient accounted for only about 5%.To solve the problem of efficient motor in domestic promotion difficult,China's government departments to the New Deal is constantly,in order to promote the development of industry.Energy efficiency standards 2012 China once in order to speed up the promotion of high efficiency motor,organized to GB18613-2006 "the small and medium-sized three-phase asynchronous motor limited value of energy efficiency and energy efficiency rating" revision,completed by China standardization institute and other units of the new GB18613-2012 "the small and medium-sized three-phase asynchronous motor limited value of energy efficiency and energy efficiency rating" countries have released in May 2012,and on September 1,2012.

After implementation,the standard of energy efficiency products will be banned from production,sales of

imports."2013 special action plan for energy saving and green industrial development from the miit on

IE2/IE3 electric motor March 26,issued by the 2013 industrial energy saving and green development action plan for special notice,in 2013 will focus on promoting the implementation of motor efficiency under special plans.: special action to implement goals so as to realize the national industrial power saving 1% (30 billion degrees),explore the development patterns and industrial energy saving and green,implementation to point with surface,drive the industrial energy saving and comprehensive utilization of the whole work progress.In 2013,according to plan,miit will from the promotion of efficient motor,eliminate inefficiencies and both the motor system energy saving technical reconstruction in six aspects,such as promotion,elimination and 100 million kw motor and motor system,the reform more efficient motor market,promote the motor product upgrading and industrial upgrading.

Motor temperature rise too high or winding burned

The number of positive &negative too ordinary,often make the motor work under launch condition,often cause temperature rise too high,and even burn winding.Common three phase induction motor reasons: being driven mechanical acmotortrading.blogspot.com card master,ambient temperature is too high,the belt too loose or too tight,the electromagnetic part of fault,the power supply voltage is too high,too low,the gap between the end of the motor coil and single phase capacitor start induction motor iron core vent plug,220v acelectric motors fan leaf damage,etc.

How to prevent damage of generator partial overheat

1.The generator outlet,neutral wire connection part should be reliable,in the operation of the unit should be conducted on a regular basis excitation variable to static excitation device of the split phase cable,static excitation device to the rotor slip ring cable,rotor slip ring high efficiency electric motor for infrared imaging temperature measurement inspection.2.Regular check electric braking action contact breaker contact situation,found that the compression spring loose ac three phase

motoror single touch refers to touch with other parallel problems should be handled in time.3.The generator insulation overheat alarm,should analyze the causes,and,when necessary,to eliminating downtime.

4.The old and new production machine maintenance,should pay attention to check the stator iron core compaction and tooth pressure refers to the presence of partial pressure,especially on both ends of the teeth,such as ac geared motor find relaxation phenomenon,should be after processing,can put into operation.Transfer or have a doubt on core insulation,shall be for the iron loss test.5.In the process of manufacture,transportation,installation and maintenance,should pay attention to www.facebook.com/dongfeng.motor prevent welding slag and metal scraps small foreign bodies fall into the stator core ventilation slot.

Promotion of efficient motor outlook

Abstract:the motor is widely used in our daily life,it throughout all corners of the from all walks

of life,in the process of production,living plays a very important function.Promote efficient motor

can save energy,reduce pollution and broad prospects,but also promote efficient motor is faced with

difficulties.Key words:marketing;High efficiency motor;Prospects;difficult Devices of all kinds of

motor as a driving force,is widely used in industry,commerce,defense,utilities and other fields.The motor power consumption average accounts for more than 50% of the total power consumption of the world,accounting for more than 70% of the industrial electricity consumption.Research shows that

through the implementation of the motor efficiency standards and promote the application of high

efficiency motor,by 2011,accumulative total of 76.4 billion kW.h,save electricity,49.7 billion

yuan,CO2 emission reduction 7 6.4 million t (emission factor:1 kgCO2 / kW.h);By 2020,accumulative total of 1 65.3 billion kW.h,save electricity 7,80 billion yuan,CO2 emissions of 160 million t.China's the eleventh five-year plan clearly,energy consumption per unit GDP in 2010 than in 2005 dropped 20%,among them as a key project of one of the ten major energy conservation motor industry's goal is the average energy consumption by 20% ~ 30%.

Therefore,the improvement of motor efficiency is of great significance for China's current energy conservation and emissions reduction work.In this paper,the brief analysis of the promotion prospects of high efficient motor:A,the advantages of high efficiency motor determines its good promotion prospects:GB 18613-18613 "small and medium sized three-phase asynchronous motor limited value of energy efficiency and energy efficiency level" defined:reach level 3 indicators of energy efficiency for the common motor;To achieve the secondary indicators of energy efficiency (equivalent to the eu effl standard),as an energy-saving motor,namely

high efficiency motor;To reach the level of energy efficiency indicators for ultra high efficiency

motor.High efficiency and energy saving motor using new motor design,acmotortrading.blogspot.com new technology and new materials,by reducing the wastage of the electromagnetic energy,heat energy and mechanical energy,improve the output efficiency.Compared with the standard motor,motor using efficient energy-saving effect

asynchronous motor is very obvious,normally efficiency can be increased by 4% on

average.Efficient energy-saving motor mainly with ac frequency conversion motor,YX single

phase asynchronous motorefficient,Y3 low-voltage high-power,wind turbines,rare earth

permanent magnet motor,high voltage Y2 compact and YB2 flameproof motor,etc.

High efficiency motor has the following advantages:1,high efficiency and low loss.We know that the motor efficiency expression is:efficiency = (input power loss)/input power was 100%.By visible on type,improve the efficiency of motor is the key to minimize wear and tear (including,core loss and winding loss wind friction loss and stray loss).Excitation characteristic of high efficiency motor with good of senior electromagnet,generator rotor and stator small metal loss and increase the dosage of

iron core and copper loss is decreased obviously,improve the efficiency.YX series high efficiency motor in China than Y series motor with high efficiency by about 3%,basic Y series motor and J2,basic J02 compared series motor efficiency is 1% higher than the 1%.The energy saving effect of using efficient motor as shown.Promotion of efficient motor outlook Electrical specifications:fully enclosed external fan cooled,2,2 kw,4,200 v,50 hz rate:100% If run 1 year 5,000 hours,can power saving about 400 KWH.2,high reliability,long life and low noise.Due to reduced losses,reduce the motor running in the process of temperature,the cooling air volume reduction,effectively improve the reliability of insulation and bearing.High efficiency motor life expectancy is longer than the average life span for ordinary motor,and lower noise.3,keep the universality and interchangeability.Due to the installation size is the same as the standard motor,keep the universality and interchangeability.4,starting torque and high locked-rotor torque ratio,power rating.Due to the power level,to reduce user's installed capacity,can avoid or reduce the "big horse-drawn cart" unhealthy phenomenon.

The common malfunction and expel the three-phase asynchronous motor

Pick to:People's Daily life cannot leave the use of the motor,the production,220v ac electric motors in the using process of www.dongfeng-motor.com the motor has a lot of attention and requirements,may cause significant safety accident.Therefore,how to timely diagnosis permanent magnet motors for sale and troubleshooting,prevent accidents,ensure the safe,reliable and efficient operation of motor,is particularly important for enterprises.Motor fault types,is more complex,can be summarized as two aspects of mechanical and rotor and stator electrical,machinery has swept

chamber,vibration,overheating and damage to the bearing fault; Electrical failure of the stator

windings without phase operation,the reverse of the stator winding unbalanced three phase

current,short-circuit and ground heating winding and rotor winding fault,open circuit,etc.The

analysis in this paper,the commonly used motor fault problems,some one motor fault diagnosis and

maintenance and repair measures.

Reverse inefficient motor inefficient Electrical engineers

Ministry of industry and administration of quality supervision recently issued the national motor

efficiency plan (2013-2015) ",to promote efficient motor development and application,upgrade of

motor,improve the level of electrical energy efficiency in an all-round way.According to the plan put

forward by ac induction motor the goal,through the motor product upgrading,is expected in 2015 was to realize power saving 80 billion KWH,equivalent to create a new Yangtze river three gorges project. Energy consumption of the motor system is the key areas of national energy conservation policy,also is one of the "twelfth five-year" key projects for energy conservation and emissions reduction,the ministry of industry and administration of quality supervision recently issued a "national motor efficiency plan (2013- 2015)",is expected to drive the high efficiency machine and related equipment of nearly one hundred billion yuan. General electrical engineer pointed out that general motors affects eighty percent industrial power Energy consumption of the motor system is the key areas of national energy conservation policy,also is one of the "twelfth five-year" key projects for energy conservation and emissions reduction.

In 2011,about 1.7 billion kw motor ownership in our country,the total power consumption of electric fan motor partsabout 3 trillion KWH,accounting for 64% of the total electricity consumption in

the whole society,including industrial motor total electricity consumption of 2.6 trillion KWH,about

75% of industrial power. Although motor level of energy efficiency in China gradually increase,but

the overall level of energy efficiency is still low.From the motor itself,the motor efficiency

average 3 to 5%,lower than the foreign accounts for only about 3% currently in use efficient motor;

Looking from the motor system,by reason of unreasonable matching,adjust the way backward,motor system efficiency 10-20% lower than the foreign advanced level. The extensive use of inefficient motor caused great waste of electricity.Every one percent increase of energy efficiency industry motor,can

save electricity in about 26 billion KWH.By promoting efficient motor,eliminated with

inefficient,remanufacturing,the inefficient motor effectively as well as to the motor system

according to the load characteristics and operation condition for energy saving renovation of

matching can be from 5 to 8% overall ascension motor system efficiency,which can realize energy

saving from 130 billion to 230 billion KWH,in the end,www.facebook.com/dongfeng.motor the

equivalent of two or three gorges power station.

High voltage motor stator coil damage problem Electrical engineers

General electrical engineer pointed out that the long-term operating experience and motor stator

winding accident phenomenon indicates that the generator and high voltage motor stator coil corrosion damage phenomenon is quite common,seriously affect the safe operation and service life of the motor.A,corrosion characteristics and parts of motor stator coil From the high voltage motor stator winding coil main insulation breakdown phenomenon,the main coil corrosion damage of the insulation can be roughly divided into two classes: class starts to coil outside the main insulation inner corrosion damage,often referred to as corrosion;Another kind began to coil internal insulation outside corrosion,commonly referred to as internal corrosion.1.1 main coil insulation outside corrosion damage (1) motor stator winding end inside the stator core and coil vibration,the primary coil insulation corrosion damage.This is the most common corrosion damage accident is also one of the most serious phenomenon.Cause this is the main reason of the corrosion damage,the motor in operation,because of its department of winding vibration under the action of electromagnetic force,the coil in the stator core groove end fixed not firm,article slot wedge,the line between layers of cushion,loose end interval block and tied the rope off,coil and lashing and friction within the interval between block,anticorona lacquer semiconductor corona corrosion damage,resulting in slot and end coil main insulation breakdown.

(2) the stator core wear corrosion of the internal magnetic materials.This kind of situation is mainly due to the maintenance process without careful cleaning and purging of the stator winding,causing the windings cracks and other corner place left some tiny

magnetic sundry,when the motor running magnetic debris was adsorbed on the surface coil insulation Lord,under the action of electromagnetic induction and electromagnetic force,magnetic impurities in rotation movement,grinding main coil insulation to drill a hole.(3) of the stator coil corrosion of

oil.At present,a large generator and high voltage motor bearing shell are widespread leak

phenomenon,thus the motor coil for burning oil corrosion accidents are quite common.Parts of the

basic focus of this kind of failure at the end of motor stator slot,winding and winding nose

leads.Are attached to the coil is characterized by the oil,to dissolve erosion effect to the main

coil insulation,main insulation and conductor is layered whole coil insulation strength is

reduced,after long time running and stator winding short circuit,grounding short circuit fault,etc. (4) the stator core silicon steel sheet of corrosion wear of the insulation.If in the process of being connected in the stator iron core,silicon steel sheet laminated,irregular or stator core ventilation channel and the end pressure refers to fixed installation,or damage to the stator core in the repair,will cause the vibration occurs when the motor running,wear insulating,eventually resulted in the breakdown of the main insulation of wire coil.1.2 coil corrosion Multiple accident statistics and fault coil autopsy results show that the coil internal corrosion is more serious.

Corrosion inside the large coil anatomic analysis showed that the corrosion is generally from insulation and conductors in the air gap between the air bubbles,coil straight line and the end of the R Angle,coil

lead off line welding etc.Corrosion phenomena within the first coil internal insulation to bleach and

gradually expand,then burning insulation form hole and a large number of green powder,so as to

accelerate and main corrosion damage of the insulation between wire strands,until the main insulation breakdown.In addition,the high temperature caused by the thermal aging is also an important factor to the internal corrosion.Second,the coil reason analysis of internal and external corrosion Motor

stator coil of the internal and external corrosion reasons,mainly due to the main coil insulation in

the motor running,long-term in electromagnetic vibration,high temperature and high voltage under the action of three kinds of factors and vibration wear,corona corrosion and thermal insulation

aging,make whole coil insulation shell,layered,burning,wear and dielectric strength reduce wait for a phenomenon,resulting in insulation breakdown of failure.Electromagnetic vibration wear corrosion (see electrical engineer) In the operation of the motor in produce all kinds of mechanical vibration,wear out coil insulation,corrosion is one of the main electromagnetic vibration on the motor end winding and the influence of notches.

If the stator core installation quality is bad,bad winding end binding process,make the coil in the groove by fixed bad,produce great vibration amplitude,article water pump interlayer pad and temperature measuring element pads in the lower level to HuiCuan move between coil and wear on the lower layer coil,the coil main insulation damage.Is more serious is that,if in the operation of the coil wire through the current 2 times frequency electromagnetic vibration,will not only make the coil and iron core and winding end interval block vibration,make the main insulation surface wear,but also can make the wire with the main insulation between the friction between interturn,shares of the wire vibration,causing wire

interturn,loose,short circuit,break between the shares.At the same time,the additional loss and the

temperature rise in short circuit,will accelerate local main insulation ageing,reduce the dielectric strength,even under normal working voltage insulation breakdown caused by failure.Therefore,the electromagnetic vibration is caused by coil outside the main insulation 8500w gasoline generatorcorrosion and the main cause of the corrosion damage.

You can run different sounds

Reason and solutions:1.Brush-check the bearing of the stator and rotor,rotor deformation,whether for

repair or replacement 2.- poor lubrication bearing damage or three phase generator replacement bearings,Motor vehicle bearing cleaning 3.Motor open phase running,check and repair the cut-off points 4.Blades touch the chassis-check and eliminate electricalmotor1.blogspot.com the fault