The connection mode of current transformer, current transformer

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 
The connection mode of current transformer load according to the receive operation requirement. The connection mode of the most commonly used for single-phase, three-phase star and incomplete star. Rated than the rating of the transformer and error change ratio KN ac electric motor refers to the rated voltage of the voltage transformer ratio and rated current of the current transformer ratio. The former is defined as the original winding rated voltage U1N and deputy while winding, the ratio of the rated voltage U2N; The ratio of the latter for rated current I1N to I2N. KN = U1N/U2N () of the voltage transformer KN = I1N/I2N () of the current transformer voltage (or current) transformer primary side voltage (or current) change within a certain range, the general rules for 0.85 ~ 1.15 U1N I1N (or 10 ~ 120%), deputy side voltage (or current) should be in proportion to change, and the original, deputy side voltage (or current) should be in phase. But due to the transformer, such as internal resistance, excitation current and loss factor and the ratio and phase error occurred, is called contrast and Angle difference respectively. 



OEM industrial electric motors

Specifications
1. effiency: IE2 and IE1 
2. 20 years manufacturing experience 
3. 12 months guarantee 

4. low noise and vibtration
Contrast electric motor price is after conversion of the secondary voltage (or secondary current) with a voltage (or current) the difference between the value size of the ratio of the latter, namely Ct (current transformer) current transformers. FU as the contrast of voltage transformer, fI contrast for current transformer. When KNU2 > U1 (or KNI2 > I1), contrast is positive, whereas negative. For no compensation measures of voltage transformer, contrast is negative, Angle difference generally positive, the absolute value of contrast and Angle difference decreases with the increase of voltage; Core motor electric saturation, contrast and increases with the increase of voltage and Angle difference. For current transformer without compensation measures, contrast negative, Angle difference is positive, the absolute value of contrast and Angle difference decreases with increasing electric current. Using the compensation method can reduce the error of the transformer. Generally by add around on transformer winding, or add additional core and access the corresponding resistor, inductor, capacitor element to compensate. Commonly used compensation method has a number of turns compensation, compensation, scores of turns compensation, small core shunt capacitance compensation, etc.

Frequency conversion air conditioning inverter motherboard power supply

Y series best cast iron three phase induction motor
Specifications
1. 20 years manufacturing experience 
2. 12 months guarantee 
3. low noise and temperature rise 
4. high starting torque 

5. AC Voltage: 220V/380V, 380V/660V,400V/690V,220V/400V

Air-conditioning outdoor mainboard work power supplied with switching power supply, motherboard + 12 v and + 5 v power supply circuit. Mainly generator set spare parts for outdoor electrical relay (led outdoor power supply is no longer PTC but straight), fan control relay, four-way valve control relay to motor parts provide power supply. The main working voltage for outdoor CPU. Therefore, wholesalemotor.blogspot.com only the frequency conversion lamination power circuit of switching power supply work, to make the control of outdoor work, can maintain normal CPU communication between inside and outside the machine. 

Sensorless brushless dc motor control - fly-wheel diode

(1) it requires that the inverter has to work in the power device take turns up and down in the way of PWM chopper, control is 3 phase induction motor difficult (2) it must be removed from the two aspects of hardware and software diode stream invalid signal conduction and the number of misleading communication due to burr interference (3) there are big error, this method also when K e very small or rotational speed is low, V, CE, V F compared wholesalemotor.blogspot.com to counter potential is not negligible, due to ignore the error due and certain phase compensation measures. fan cover Because of the above shortcomings and the insufficiency, this method is not widely used in domestic now.

Three-phase asynchronous motor winding short circuit

Due to poor welding or use corrosive flux,have not cleared after welding,it may cause a pot of welding or loose;Subjected to mechanical stress or collision coil short circuit,also can make the wire burned,short circuit and earth fault in a couple of wire and burn a single or a few wire short circuit,several other wire due to the increase of current temperature rise,cause heating winding and open circuit.Generally fall into one phase winding end disconnection,turn-to-turn short circuit,parallel branch circuit,wire and burn more of a single circuit,rotor broken cage.Fault phenomenon: 1.The motor can't start,unbalanced three phase current,there are abnormal noise or vibration,temperature rise more than permitted or smoke.2.Reasons: (1) during overhaul and maintenance touch off or manufacturing quality problems.,(2) winding each element (phase) group and the 5kw permanent magnet generator winding and fixture wire connection head welding,sealing off long running overheating.(3) by the mechanical force and electromagnetic force make winding damage or pulled apart or cause drag mark.(4) or interphase short circuit and grounding caused winding coils badly burned or fuse,etc.

3.Check the method: (1) the method of observation.Breakpoint most occurred in winding ends,look have without touch fold,joint the presence of desoldering.(2) a multimeter.Using resistance,to "Y" type of connection to connect a table bar in the center of the "Y" shape,the other in turn in the head end of the electric motors price three-phase winding,infinite phase has a breakpoint;"Delta" connection type of short connection,measuring winding in each group respectively,infinity to breaking point.(3) test lamp.Method with former,such as bright a photograph for open circuit.(4) megohmmeter.Resistance tends to infinity (that is,not as a zero value) is the cut-off point.(5) current meter method.Motor at runtime,use current meter to measure three phase current,if the imbalance of three phase current and short-circuit phenomenon,and no is a phase winding is part of the current small short circuit fault.(6) bridge method.A phase when the motor is bigger than the other two phase resistance,resistance show that the phase winding part of open circuit fault;(7) the current balance method.For "Y" type of connection,but after the three-phase winding parallel,alternating current into the low voltage large current,if the current in the three-phase winding is greater than 10%,one end of the small current for the circuit;For "delta" connection type,the stator winding of a contact apart first,then by interlinked into low voltage high current,wholesalemotor.blogspot.com one of the small current for open circuit.(8) broken cage detector test.Check,if the broken rotor cage millivoltmeter readings should be reduced.

4.Open circuit processing method: (1) open circuit in the end,the connection after welded,set of insulating tube,with insulation material and good binding,dry again.(2) the winding due to interturn,interphase short circuit and grounding,etc and cause severe charred generally should change new windings.(3) to the breaking point in the slot,belong to a few breakpoints for single phase asynchronous motor emergency treatment,the grouping elimination method is adopted to find the breakpoint,and broken in winding connection and the insulation used after qualified.(4) can be used for broken squirrel-cage rotor cage welding,cold connection or change the original repair.

Three-phase asynchronous motor speed and voltage have a relationship

Simple from the formula,the rotational speed of rotating speed and voltage are theoretically

acmotortrading.blogspot.com has nothing to do,in fact change the applied voltage is affect the speed of the motor.The following description can electric motors 12 volt help understand the asynchronous motor revolutions formula n = 60 f/p * (1-s) p-logarithm,s-slip Speed regulation method 1.Change the frequency of the power supply (2) pole change motor logarithmic 5kw permanent magnet generator 3.Change the slip.Slip changes can be made of the following measures to achieve 1.2.Change the applied voltage in mini electric motor the rotor circuit introduction plus resistance (3) the introduction of additional potential in the rotor circuit.

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.

The fan blade

In the context of the fan www.dongfeng-motor.com blade or blades,electric tools

series motor rotor fan blade have to use fan leaf (iron,plastic) and single-phase,three-phase

asynchronous motor with fan leaf (now mostly plastic).Single and three-phase asynchronous motor,the make and model of the fan blade by the motor model,the number printed on the surface of the fan blade.As fan blade,Y Y-90-2-90-4,6,8 fan leaves,usually 2 is a series,4,6,8 is a series (gm).As emergency substitute,because the number of at the same time,not 2 can be very use tip of the leaf of fan use scissors to stator substitute,otherwise can't cover the upper hand.Remove the fan blade method series motor,generally with a long flat iron pry the class object (e.g.,flat file).After years of use,fan leaf aging is disassembled extremely fragile,be careful operation.Series motor high efficiency electric motor rotor fan www.facebook.com/guohong.trading blade available special Lamar spin out,also can use internal combustion engine valve down.