The use of 60 hz import motor and power supply design

In the early 90 s, a rubber manufacturing company the five sets imported from North America (second-hand) rubber equipment, there are two production Farrell 11 d mixer and a SL sullair company - 32 type screw air compressor. Basic situation of the three electrical motor 12v 1000w devices test is good, according to the production requirements, companies need to benefit installation fan motor commissioning as soon as possible; But the use of these equipment there is a big technical problem: the driving gear of these devices is 60 hz five sets of high voltage motor, not directly into the 50 hz power grid of our country. But if all replacement for domestic 50 hz, 6 kv motors and high voltage, need to increase cost nearly 1 million yuan. In order to solve the technical problem, technical personnel for imported equipment of acmotortrading.blogspot.com the power supply system, switch gear, motor parameter and so on has carried on the earnest analysis and calculation, decided to adopt frequency conversion principle, tinkering with the system power supply design.

Wire and cable load output voltage is normal, after the loading of overload or over-current electric motors

small motor spares suppliers of motor parts 

Specifications
1.20 years fan&motor manufactruer 
2.We can open mould&punch&diecast&finish&winding 

3.competitive price,high quality 
 This kind of situation is usually due to improper parameter Settings or drive circuit aging, module damage caused. Take time to add cooling fluid method fridge?? Refrigerator take time AC motor to add liquid cooling method ac synchronous generator For refrigeration equipment repair, time is the second 3 phase induction motor step of the general fault maintenance. The first is to suppress (not including the compressor or change tube) in determining the pipeline without leakage, the next step is to fit. There are two commonly used methods: 1, use the vacuum pump. You can also use a compressor to replace www.dongfeng-motor.com the vacuum pump. Time is longer than with the vacuum pump is a few longer, because of the relative likelihood () compressor exhaust two (amount) to some smaller than vacuum pump. On the fridge process pipe connected to a job with magnetic generator a pressure gauge valve, one ac synchronous generator head welding on the compressor, the other end with a liquid pipe connection on the vacuum pump, open the table method (valve) the door, start the vacuum pump or diesel engine external compressor, start time, when there ac motor is no gas discharge vent on the vacuum pump, take time to complete.

Wire connection, connection quality and color code is not in conformity electric motor with the requirements

AC motor aluminum 2800 rpm motor fan cover 
Specifications
1. Customised 
2. good quality 
3. Surface treatment: Galvanize 

4. AC motor 
1, phenomenon (l), do not use copper joint multi-strand wire, directly into a "sheep on the rim of the eye", but not enlarge tin. (2), distribution box and switch, socket, terminal at the connection of a terminal connected to a few wire. (3), thread bare, wire arrangement is not neat, without a bandage. (4), three phase conductor, zero line (N), grounding protection line (PE) AC motor color ac motor code, or confusion. 2, root cause analysis (l), construction personnel did not master conductor wiring craft and technology. (2), material buyer didn't save the construction in accordance with the requirements for all kinds of wire color and quantity, or construction management personnel in order to save material and mix. 3 (l), preventive measures, strengthen construction personnel to the specification of the learning and skills training. (2), multiple strands of wire connection, the single phase motor application of pressure welding galvanized copper joint, try not to do "sheep on the rim of the eye", such as do, should be uniform in China diesel generator set tin. 


CCC CE ROHS UL VDE Certification and 115/120 V AC Voltage 220V&120V induction motor

Specifications
1. Specifications1.3-phase asynchronous motors 
2. IEC standard 
3. OEM 
4. Voltage:50HZ &60HZ;380V&415V 

5.Protection class: IP54
(3), on the terminal and the terminal wire connection should be only 1 piece, if you want to pick up two root, add flat shim between; Don't allow more than 3 root connection. (4), wire arrangement to horizontal flat vertical, strip thread should maintain each thread length is consistent, should not have exposed conductors after wires into terminal; Copper joints and the insulation of the wire connection to use the same as the wire color adhesive bandage. (5), material procurement staff magnetic generator must according to the site need to match all sorts of color of wires. (6), construction personnel should clearly distinguish between phase line, zero line (N), grounding protection line (PE) and to distinguish the color target, the effect of the PA phase - yellow, B - green, generator set C phase - red; When the single-phase acmotor2.blogspot.com general appropriate USES red; Zero line magnetic generator (N) shallow blue or blue; Ground fault protection line (PC) must use yellow green double color wires.

How to visually distinguish between ac and dc motor?

electric motor stator rotor lamination motor parts 
Specifications
1. Lamination of electric motor 
2. IP54 class F 
3. 100% copper 
4. silicon steel stamping 

5.stunning performance 
Look from the other end of the motor output shaft, a blade is ac motor, can see the commutator (or see 3 phase ac auto parts induction motor commutator and carbon brush dc motor. If told two motors as big power, small volume of ac motor. Generally it is. Don't look at brand dc and ac motor is to judge? Can only see the inside of the motor acmotor2.blogspot.com terminal block wiring board, from Induction motor below strips can tell, is the dc and ac motor.

Direct torque control

 Direct Torque Control (Direct Torque Control, DTC), the text of the abroad some also called Direct self - Control, DSC, literal translation for Direct self Control, the concept of Direct self Control for Torque as the center for www.dongfeng- motor.com integrated Control, not only to Control the Torque, also used for the amount of flux linkage Control and flux linkage Control. The difference between the direct torque control and vector control is that it is not by controlling current, flux amount of indirect spare parts torque control, but the torque directly accused of quantity control, as the essence of which is using space vector analysis method, with the stator magnetic field orientation, the motor electric stator flux and electromagnetic torque in direct control. In 1985 Germany's ruhr university DiPu brock (m. epenbrock) professor is presented based on the first hexagon and round flux trajectory of the Direct torque control theory, he is called Direct self - control - DSC. This method does not need complex coordinate transformation, but directly on the motor fan cover stator coordinate computing the size of the torque and flux of the mold, and by direct tracking of flux and torque PWM pulse width modulation and high dynamic performance of the system.

Electric equipment maintenance procedures

 Oil-immersed transformer maintenance procedures are in operation or shutdown transformer routine maintenance once a year,stop running transformer increase maintenance once before put into use. Maintenance steps:(1) off to maintain the low voltage side of transformer circuit breaker,pull the isolating switch,hang on the permanent magnet motor corresponding sign.(2) disconnect the transformer high side load switch,confirmed after the disconnected position on grounding knife,and complete the switch security insurance and hanging sign.(3) into the transformer oil chamber,the first application of high-pressure electroscope to confirm whether the station transformer in the ac induction motor power state,and then pulled high voltage isolation knife,check the shell,porcelain and lead any deformation phenomenon,there is any breakage should be replaced,the oil level is normal,if there are any oil leakage phenomenon,should replace the rubber gasket,check whether the silica gel is effective,if there are any discoloration or serious failure,should be replaced immediately.

(4) retightened lead terminal,pin,grounding screw; Screw into the line,if there are any loose,should remove the screw with a flat file file interface,touch no uneven feeling after use clean cloth to wipe the dust,wipe on vaseline,change new spring washer,tighten the screw.(5) check whether the lighting,cooling and dust removal equipment surrounding the transformer is in good condition,with a clean cloth wipe away the diesel generators prices dust on the transformer body and vases.(6) check the transformer high side load switch,to ensure the flexible operation,good contacts,transmission part of the lubrication process.(7) 2500 v of the shaking table was used to measure high and low voltage transformer coil insulation resistance (to) and alternate with,in order (at room temperature 30 ℃,1 okv transformer high voltage side is more than 20 m Ω,low voltage side is more than 13 m Ω.Before the test,can good grounding wires,determination to end,should be discharge.

(8) check whether there is any legacy tools on transformer room and www.facebook.com/dongfeng.motor transformer,and verified,and on the high side isolating switch,evacuate the scene.(9) pulled high voltage earthing knife,after check grounding in the off position correctly,closed high-voltage load switch,let the transformer,and remove the high pressure side id CARDS,pay attention to in the open or close the transformer high voltage load switch,the site must have at least two people.Record maintenance results in detail,after delivery document preservation.(10) of the dry type transformer maintenance procedures and maintenance of oil-immersed very much the same. Maintenance of transformer's note: to ensure the use environment of transformer,in the absence of corrosive environment,the environment temperature should be within the - 30 ℃ to + 40 ℃,wind speed is not more than 350 meters per second,in the transformer high voltage side such as high voltage load switch,the operator should be three-phase transformer side short sub,and makes operation records at any time.High voltage transformer operating personnel should wear insulated shoes,wear insulated gloves.To prevent the transformer in the power and the transformer job mother discharge of electricity.

What are the components of transformer overhaul?

(1),hanging out of the body,overhaul,body (core,coil,generator generator set tap- changer and lead);(2),maintenance safety cover,oil storage tank,gas,heat pipe throttle single phase generator and casing;(3),and cooling device and oil filter equipment,(4),filter oil or oil changes,if necessary,dry processing.(5),the access control and measuring instrument,signal and protection device;6,clean up the shell,if necessary,paint;All landowners,assembly and measurement and test.(1),hanging out of the body,overhaul,body (core,coil,tap-changer and lead);12v mini generator motor (2),maintenance safety cover,oil storage tank,gas,heat pipe throttle and casing;(3),and cooling device and oil filter equipment,(4),filter oil or oil changes,if necessary,dry processing.(5),the access control and measuring instrument,signal and protection device;6,clean up the shell,if necessary,paint;All landowners,assembly and measurement and test. Advantages of wound asynchronous motor can be through the collector ring wholesalemotor.blogspot.com and brush,plus resistor in series with the rotor loop,to improve the starting performance and can adjust speed change and resistance within a certain range.But the wound,more complicated than the squirrel- cage asynchronous motor structure,poor reliability of the movement of the price is more expensive.

electric starting motor common fault analysis and maintenance of failure

When electric power,the motor does not work,and the motor without any sound.To analyze its main reason is the permanent magnet motor starter motor matching with electric equipment,if the electric fan,fan,washing machine motor adopts capacitor start running,and refrigerators,freezers starting mechanism adopts resistance split-phase start running,so once starting ac induction motor capacitor in the circuit and phase splitting resistance damage destroyed,seizing work,lead to motor testing should be excluded when starting or resistance after failure,to check the motor fault.Another case is inside www.facebook.com/guohong.trading the motor winding short circuit,partial winding burned,cause the motor to stop working.


When there is a failure in the once suspected the motor itself,the most simple detection with multimeter resistance of the winding resistance measurement.Will first motor three root lead ABC use multimeter to distinguish the judgment,here in double barrel of washing machine motor,for example,when measuring the resistance value between AB in 95 ohms,resistance value between the BC in 130 ohms,AB resistance in 12 ohms,so it is easy to determine the C for linear,AC for running winding,BC for starting winding.Above all is normal of the motor winding resistance value,in the event diesel generators prices of a short circuit,the resistance value are less than the above normal,motor windings of various kinds of problems.Again like a refrigerator motor starting winding short-circuit,23 ohm resistance around,no running winding short circuit,resistance value between 10 ohms,starting and running the concatenated winding resistance in 35 normal ohm.

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

motorrunning capacitor if during motor operation,a little bit more motor with load will

stop.

The generation of arc

When using switch electrical disconnect current,if the circuit voltage not less than 10-20 v,current not less than 80~100 ma,electrical contact between will produce electric arc.Arc is free gas of high temperature and high electrical conductivity,it not only has a lot of damage to contact,and prolongs the time that disconnect circuit.Therefore,in the structure and working condition of the switch

electric acmotortrading.blogspot.com before,first to

see how its produce and put out.The formation of the arc is contact between neutral protons

(molecules and atoms) is the process of free.Switch contact separation,the distance between the

contact is small,high electric field intensity E (E = U/d).When the electric field intensity exceeds

3 x 1000000 v/m,the electrons on the surface of the cathode electric field force will be pulled out

of the free electrons to form a contact space.

This free way is called:strong field emission.The free electrons emitted from the brake

rotorcathode surface and the contact between the original a few electronic,in under the

action of electric field force to accelerate the anode movement,constantly and neutral particles collide on the magnetic motor way.As long as the electronic velocity v is

high enough,the kinetic energy of the E = mv2 is enough big,can from the nature of playing

electronic,the formation of free electrons and positive ions.This phenomenon is called collision

free.New form of free electrons also accelerated motion to the anode,similarly will free with neutral particle collisions.Collision ionization is continuously as a result of the contact between full of electrons and positive ions,greatly conductance; Under the applied voltage,arc medium is punctured,the circuit again by conduction.

Contact arc burning gap between called arc gap.Arc,arc gap between the heat on the surface of the cathode of the electrons gain enough energy and emission,outward form thermoelectricity field emission.At the same time under the action of high

temperature (arc center part to electric motors

pricemaintain the temperature can reach more than 10000 ℃),irregular hot gas neutral

particle movement speed increase.When have enough kinetic energy neutral particles collide with each other,will be free and form electrons and positive ions,this phenomenon is called thermal dissociation.Increase with the distance separate contact,the contact between the electric field intensity E gradually decreases,and the arc combustion is mainly rely on thermal free

maintain.Between switch electric contact,free process at the same time,also happening to the

disappearance of a charged particle free process.

Three-phase asynchronous motor wiring diagram

Three-phase asynchronous motor wiring diagram:three-phase three-phase motor stator winding of each phase winding has two thread ends.A head is called the head end,on the other side called terminal.Provisions of the first phase winding head end use D in table 1 ,end in 4 D; The second phase winding head end with D2,said end D5 said; The third phase winding end of the first represented respectively with D3 and D6.The electric vehicle motors ix thrum import terminal block wiring Column,the terminal marked accordingly D1~D6 tag,as shown in figure (1).Six of the three-phase stator winding end three-phase stator windings can be a star or triangle,y connection is a three-phase winding End up in parallel,the D4,D5,D6 three terminal with copper link together,and the three-phase winding head end access three-phase ac power supply respectively,the D1,D2 and D3 access A and B,respectively C power supply,as shown in figure (2).And triangle by law is the first end of the first phase winding to the 1 D connected to the end of the third phase winding D6,access to another phase power; The second phase winding head end with D2 At the end of the first phase winding connected D4,access to the second phase power; Head end of the third phase winding D3 connected to the end of the second phase wholesalemotor.blogspot.com winding D5,and access to the third phase power supply.In the wiring board will be answered Line column and D6 D1,D2 and D4,D3,and D5 with copper connected respectively,then access to the three-phase power supply respectively,as shown in figure (3).An electric motive is pick a star or triangular,should regard factory rules For,available from the motor nameplate.Is the first of the three phase stator winding end manufacturers set beforehand,never can be arbitrary,but a first end of the three-phase winding up can be reversed, For example will be the motor fan end of the three-phase winding D4,D5,D6 upside down as the head end,D1,D2 and D3 as an end,but never separate the ends of the head of a phase winding upside down,otherwise will produce wrong wiring. If wrong wiring junction box found raw,or winding end of the first mistake,light can't the normal starting motor,long electricity causes starting current too big,motor heating is serious,affect the life, Or burning motor winding,or cause the power short circuit.