Y series (IP44) asynchronous motor

Motor capacity from 0.55 to 200 kw,class B insulation,protection grade IP44,reached the international electrotechnical commission (IEC) standards,products reaching the international level in the late 1970 s, Whole series of the weighted average efficiency is 0.43% higher than electric vehicle motor that of JO2 series,the annual output of about 20 million kW.Yx series high efficient motor The class organized by Shanghai electric appliance science research institute of motor industry,the successful

development capacity of 1.5 ~ 90 kw,2 minus the number of three,etc.The full series motor efficiency

on average than Y (IP44) series high about 3%,close to the international advanced level.Apply to the single direction,years working time in more than 3000 h.Load factor is more than 50% of

occasions,power-saving effect Fruit is remarkable.This series of wholesalemotor.blogspot.com motor output is not high,the annual output of about 10000 kW.The speed regulating pole change motor Main products are at home has been mass-produced YD motor parts (90.45 ~ 160 kw),YDT (0.17 ~ 160 kw),YDB (0.35 ~ 82 kw),YD (0.2 ~ 24 kw),YDFW (630 ~ 4000 kw) and so on eight series of products,application has reached the international average level.Electromagnetic slip speed regulating motor China has batch production YCT (0.55 ~ 90 kw),YCT2 (15 ~ 250 kw),YCTD (0.55 ~ 90 kw),YCTE (5.5 ~ 630 kw),YCTJ (0.55 ~ 15 kw) Eight series of

products,such as application has reached the international average level,including YCTE series has

the highest technical level,the most promising.

Fault phenomenon:after connecting a motor can't start

Reason and solutions:1.Stator winding connection errors-check and correct it 2.Stator winding is open circuit,short circuit grounding,orbiting around the rotor winding circuit electric motivation - find out the fault point,troubleshooting 3.Under the heavy load or actuator three phase generator stuck-check the transmission mechanism and wholesalemotor.blogspot.com load 4.Wound rotor motor rotor circuit open circuit (brush and slip ring poor contact,rheostat circuit,lead poor contact,etc.),find out the breaking point,to repair them 5.Power supply voltage is gasoline generator too low,check the reason and ruled out 6.The power supply lacks-check the line,recovery phase.

When measuring rotor winding interturn short circuit fault of use method

Put the rotor under test in a test in the mouth,make the motor spare parts turn-to-

turn short circuit energized tester,tester within the closed magnetic circuit core and rotor core has

alternating magnetic flux,and if there is no short circuit,magnetic flux through the coil of the

coil,there is no short www.dongfeng-motor.com circuit current,on the small iron

notches (small hacksaw blade vibration will happen.If the coil turn-to-turn short circuit,word small plate,vibration will occur when the rotating rotor,one can find out all the short-circuit coil

slot."Little experience" When small plate vibration,should be cleaned motor

laminationup mica slot commutator conductive material (such as charcoal powder),then test

again,in order to avoid miscalculation.When measuring rotor winding interturn short circuit fault of use method.

Three-phase asynchronous motor fault maintenance

Journal wear is not big,can be in shaft neck on a layer of chrome plating,grinding to need size;Wear

is large,can be in shaft neck for surfacing welding on to the lathe cutting polishing;If the journal

wear too much,also on the shaft neck turning 2-3 mm,car a sleeve again,strike set on the neck,and

then turning to the required size.If bending is not big,but by the method of grinding optical axis

neck,slip ring repair;If bending more than 0.2 mm,can put in the press,the rotating shaft in bend

pressure correction,after correction of the surface of the shaft with lathe cutting polishing;If the

bending is too large,the new shaft electric vehicle motor are subject to change.Rolling bearing oil shortage,can hear the sound of the "bone bone";If heard discontinuous "terrier infarction",may be bearing rims rupture.Y series three-phase asynchronous motor bearing inner mixed with sand and other debris or bearing parts had mild wear,create a slight noise.The transverse crack depth of no more than three phase asynchronous motor shaft axis diameter does not exceed the 10% to 15%,the longitudinal crack of 10% longer axis,surfacing method remedies are available,and then finish turning to required size.If shaft crack in more serious,need to replace the new shaft.

Chassis and end cover if there is a crack should be welding repair.If meet the bearing bore clearance is too large,resulting in bearing end cover with too loose,generally available will punch bearing uniform with burr hole wall,then into the end cover of the bearing.For motor power is bigger,also can be used with or plating method,finally work out the

size of the bearing need.(set,rotor are made by insulating silicon steel sheet pile into each

other,is the magnetic circuit part of the motor.,the damage and deformation of the rotor iron core is

mainly due to acmotortrading.blogspot.com the following

aspects.(1) bearing excessive wear or bad assembly,and rotor rub,make the surface damage of the iron core,and cause a short circuit between silicon steel sheet,motor iron loss increase,make the motor temperature rise too high.Then apply smooth file tools such as deburring,eliminate short silicon steel sheet,clean up after coated with insulating paint,heating and drying.(2) when the demolition of the old winding force is too big,make the stolen slot askew and open outward.The application of needle nose pliers,wooden hammer tools such as finishing,to reset the tooth bad,bad and reset has a gap between silicon steel sheet to join green shell paper,veneer rigid insulation materials,etc.Due to reasons such as the surface corrosion of the iron core (3) because of be affected with damp be affected with damp.At this moment need sandpaper clean,clean up after coated with varnish.(4) around like a heat burning core producing bad or teeth.Can use chisel or scraper tools such as deposition

thing out clean,coated with insulating paint dry.(5) between motor fan the core and base combined with

loose,tighten the original positioning screw.If positioning screw failure,can stand on the drill

positioning hole and tapping,tighten the set screw.Rusty spot on the surface of the bearing surface

available 00 # sandpaper erase,and then into the gas cleaning;Or bearing have crack,inside and

outside the ring rupture or bearing excessive wear,a new bearing should be replaced.Replace new

bearing,bearing should choose the same as the original model.Ac motor shaft through the bearing support,was part of the heaviest load,it is easy to wear and tear parts.

How to deal with magnetism loss?

Generator should be long time need not,(1) cause before delivery contains the remanent magnetization in core,lose excitation coil can't afford to electric vehicle motor build its magnetic field,then a generator under normal,send electric motor cooling fanout electricity,this kind of phenomenon,new long-term unused units or more.(2) the deficiency of another,the magnetization electricity,numerous machine back Old trouble again,this kind of phenomenon cannot effect a radical cure thoroughly Emergency treatment: The former battery copper ring on the magnetization can be (but note polarity),the latter with the following methods 1) equipped with excitation button,click the field button, 2) no excitation button,using battery for its magnetization www.dongfeng- motor.com 3) often pick a light bulb in the load,overdrive for a few seconds,effective,do not prevent try.

A common faults and elimination method of induction motor

1) the motor can't start motor starting,ringing or low speed,this is the most common fault.Its reason is: power disconnection or blown fuse,switch starting equipment or a poor contact or broken line in the stator coil;Or because of lag in the brush brush card,no contact with the slip ring;Stator

voltage is too low or excessive load on the permanent magnet generator reason leads

to the failure.Processing methods available voltmeter to check voltage of the motor,such as a phase power lines to check the power supply of power,insurance,switch and starting equipment contact,repair or update processing respectively.If starting rheostat is damaged,can be used to check the lamp or shaking table test,find out the fault wholesalemotor.blogspot.com repair;If it is found that the load is too big,should reduce or change the capacity of the larger motor.(2) motor

overheating causes overload or stator terminal voltage is too high,too low,poor ventilation,may also have a bolt stator coil,etc.Measures should be taken,such as reducing load,to adjust the mechanical and electrical pressure rating,remove the body ventilation slot dirties dustiness,bolt repair.(3) the spark to appear on the slide Reason is lack of the pressure on the slip ring or carbon brush and slip ring dirt,etc.,can be used sand paper to grind is good,with the cleaning brush frame,make the carbon brush block,adjust the spring pressure;Also can use clean cloth dipped in a small amount of

gasoline,cleaning brush.If spark acmotortrading.blogspot.com for slip ring is not round,can take fine car slip ring polishing.

(4) motor violent vibration Reason to install more bad,basic not firm,foot screw is not tight;The individual may also be due to rotor copper bar tensile fracture or short circuit ring.Find out that the former should be correct,which can replace the new copper,the fracture of the available copper weld repair.Sometimes because the rotational part touching the fixed place.Should check the shaft wear and clearance of the stator and rotor,take the fine car rotor or replacement of wearing parts.(5) motor no-load current balance,but value is big 1.The cause of the problem (1) to repair,the stator winding turns to reduce too much;(2) power supply voltage is too high;(3) Y after motor misconnection Δ;(4) in the motor assembly,rotor installed backwards,motor lamination making the stator core unaligned,effective length cut short;(5) the air gap is too large or uneven;6 overhaul when the demolition of the old winding,using hot tear open method is undeserved,make the iron core loss.2.The troubleshooting (1) rewind stator winding,restore the correct number of turns;(2) managed to restore rated voltage;(3) to connect to Y;(4) to assembly;(3) to replace the new rotor or adjust the air gap;(5) maintenance core or

recalculate winding,appropriately increase the number of turns.

Motor variable frequency speed control applications

When using frequency control of motor speed,need to process requirements,saving benefit,such as payback period of investment is taken into consideration.If only from the technological requirements,saving benefit consideration,the following several ways to choose a variable frequency drive (VFD) Variable frequency speed regulation by frequency converter,for the determination of the capacity of the inverter is very important.Ac frequency conversion speed regulation method is three- phase asynchronous motor speed governing of the most promising method.With the continuous development of power electronic technology,reliable performance,matching complete,the price is cheap inverter will appear constantly,this technology will be more extensive and widespread application.At

present,the foreign advanced countries of frequency conversion technology is miniaturization,high reliability,resistance to pollution,multi-function,high performance,such as direction,is to speed up the pace of development in our country.Ac variable frequency speed regulation technology has been widely used in the industrial developed countries.The United States has 60% - 65% of the electricity used for motor drive,due to the effective use of the frequency control of motor speed technology,industrial transmission electricity saves only 15% - 20% of the electricity.Transmission speed change system,the use of variable frequency speed regulation can make the speed control system structure is simple,control accuracy,and easy to realize process control.Replace mechanical variable speed with frequency control of motor speed.Such as: machine tools,not only can save complex gearbox,also can improve the precision and satisfies the requirement of process control.

Using frequency control of motor speed instead of gate or baffle,is used to adjust flow in fan,water pump,compressor,etc.For example: the boiler water pump,fan,induced draft fan with frequency control of motor speed control,not only save the servo amplifier,electric operator,Y series three-phase asynchronous motor actuators and the water supply valve (or back plate),and makes the whole boiler

boiler control system has been fast dynamic response,high control accuracy and stability.Adopts frequency control of motor speed,one is the speed according to requirements,the second is energy conservation.It is mainly based on the following factors:(1) variable frequency speed regulation system itself loss is small,high work efficiency.(2) the motor at low slip always keep running state,reduce the loss of rotor.(3) can realize the soft opening and brake function,decrease the starting current impact.Reasonable capacity selection itself is a kind wholesalemotor.blogspot.com of energy saving measures.According to the existing data and experience,there are three more simple method:(1) motor actual power First of all,to determine the actual motor power,in order to select the inverter capacity.(2) the formula method of safety coefficient is 1.05,the capacity of the inverter Pb for Pb = 1.05 Pm/hm x cosy (kW) Type of Pm motor load; Hm power for the motor.After calculate the Pb,in inverter product catalog can choose the specific specification.For n In the rated current of the motor,the n of the Numbers for the motor.In any case,cannot be used in continuous more than rated current (I).(3) the motor rated current inverter frequency converter capacity selection motor parts process,is actually a process the best match between the inverter and motor,relatively safe is the most common,also make the converter capacity is greater than or equal to the motor rated power,but want to consider the actual power of the motor in the actual match what differ with rated power,are usually selected equipment capacity is big,but the actual ability to small,so according to the actual power of the motor to select frequency converter is reasonable,avoid to choose the frequency converter is too large,increased investment.The frequency control of motor rotor balancing machinespeed has many advantages,but also has its disadvantages,the main problem is the containing higher harmonic current is more,except to the power grid pollution also increase the motor itself loss,fever caused by motor.Again,the technique of the transducer expensive,long investment recovery,complex,especially in realizing closed-loop automatic control,technical processing is also required.In addition,the frequency converter is not any case,if the motor load change is not big,or deep well pump is equipped with a water tower,power saving,water saving effect is not large,unfavorable use frequency control of motor speed.According to the technological requirements,production line or single equipment need to program or adjust the motor speed according to the requirement.Such as: packaging machine transmission system,according to the different varieties of products,need.