Four capillary connected to the main valve and control valve of the four-way reversing valve principle is introduced

 The main valve and control valve four capillary connection four-way reversing valve, and the three root capillary connection compared the four-way reversing valve, electric motor 12v 500w control valve below three capillary connection in the same way, but on the control valve to increase the capillary connection to the main valve of high-pressure air inlet pipe 4, a high voltage channel. The four-way reversing valve control valve and main valve on the structure and movement theory, namely: the control valve is itself a four-way change valve. 

When the system generator set spare parts is in a state of refrigeration, the electromagnetic coil is not electricity, release valve, valve core due to spring force moved to the left, capillary E and C, B and D, the main valve nozzle within 4 high pressure through capillary B and D into the right space inside the main valve, main valve in the space of the left by capillary C and E to the low pressure ac motor air gate 2, the main valve internal pressure is right wholesalemotor.blogspot.com high left low, piston driven slider move to the left side, nozzle with the 1 in 2 and 4 with 3 connected; When the system is in a state of heating, electromagnetic coil current and the effect of electromagnetic force control valve valve core to move to the right end, capillary E connected with D, B and C, the main valve in the left side become high pressure and right side into a low pressure, the valve core is to the right side, the connecting tube 2 and 3, 4 and 1.

3 okw motor, 380 v voltage. The power factor is 0.2, could you tell me how to calculate the rated current?

Rated current I = P30KW U0.38 KV / 1.732 * * 0.2 = 227.9081 A, but electric motor 12v 500w 30 kw motor power factor can't be so low ah, do you want to calculate no-load running current of motor. The question you ask is problematic. ac three phase motor 30 kw motor power factor should be above 0.75. If according to the capacity of current rating: I = P30KW U0.38 KV / 1.732 * * 0.75 = 60.7755 A. Teach you two formula, very useful: "capacity divided by the number of kv, dealer by coefficient of seventh. "A kw, two current" can estimate the rated current of three-phase motor. Low power factor, then the acmotor2.blogspot.com motor should be banned the example of the net. Line current of three-phase ac asynchronous motor I material 2 P, P - power, kw. I material 2 x 60 kw motor current 30 = 60 a.

The structure of the four-way reversing valve

Four-way reversing valve is mainly composed of pneumatic directional control valve spool (main) valve, electromagnetic directional valve (control valve) and capillary. Within the main wholesalemotor.blogspot.com valve is electric motor fan cover composed of slide block, piston valve core, the main valve body ends for hole can make both ends of the capillary and connect body space, slider respectively fixed on both ends with ac motor the pistons, piston on both sides of the space through the vent in the piston is same. Control valve consists of body and electromagnetic lamination coil. The body contains type needle valve core. Between the main valve and control valve has three (or four) capillary is linked together, form the whole four-way reversing valve.

The matters of attention in the four-way reversing valve application

A) four-way reversing valve of the welding interface should closely, reliable, avoid false welding, and virtual welding etc. Bad phenomenon; B) four-way reversing valve should not appear collisions with other piping, AC synchronous generator components, friction phenomenon, in order to avoid noise and component damage consequences C) shall be fixed tightly four-way reversing valve coil, avoid loose phenomenon, the influence on the reliability of the four-way valve and D) four-way reversing valve in the effective cooling measures must be taken when welding, in case set caused by high temperature in the process of welding deformation of fan motor valve wholesalemotor.blogspot.com core, cause single phase motor price part scrapped; E) used four pillars of four-way reversing valve in the pipeline should be 2 hot cold, such as temperature in little or no difference in temperature, the four-way reversing valve is the high and low pressure has mixes up, four-way reversing valve should be timely replacement.

Research on the positioning control of asynchronous motor - fuzzy controller

(1) to determine the fuzzy controller input variables and output variables (2) design control rules of fuzzy controller (3) establish the blurred with the fuzzy method (4) select the fuzzy controller input variable and output variable in the theory field and determine the parameters of the fuzzy controller (quantitative factor and scaling factor) (5) the preparation of the application of fuzzy control algorithm (6) the rational selection of sampling time fuzzy control algorithm electric vehicle motor Generally use a two-dimensional fuzzy controller to the change of the error and error as input variables, to control the change of the quantity of output. The design of the fuzzy control rules generally includes: choose the word set of input/output variables, define a fuzzy variable fuzzy subsets and establish the control rules of fuzzy controller. The word set input and output variables, as a general rule, be {NB, NM, NS, NO, PO, PS, PM, PB}. Fuzzy variables of the fuzzy subset is to determine the shape of membership function of fuzzy ac electric motor subset. 


General use normal distribution. Control rules available conditional statements describe, that is, If A and B, Then C, Then control rules table is established. Blur is the accurate quantity into fuzzy quantity, can use formula: Y = 12 X (a + b) / 2 / (b - a) accurate quantity is the actual range [a, b]. The output of the fuzzy control is a fuzzy quantity, it cannot directly control the controlled object, needs to be converted into precise volume. There are three methods: (1) selection of maximum membership degree method. The method is simple, less but the use of information; (2) take the median method; (3) the weighted average decision method, the use of information, but the large amount of calculation. Controller of the control algorithm can be written as if E = A (I) then EC = B (j) then U = C (ij) (I = 1, 2, 3,... m; j = 1, 2, 3,..., n) based on the sampling error, error change, can calculate the corresponding control quantity changes, to all the X, Y all the elements in the entire portfolio to calculate the corresponding control quantity change, U can be written as matrix (ij) (n * m) will be made table electricalmotor1.blogspot.com matrix, as A lookup table, to be stored in memory. After the real-time control, based on the fuzzy quantitative error value and error changes of look-up table directly, then set the scaling factor can be as the output to control the controlled object.

Anion generator

Anion generator through the anion generator using pulse, oscillation electrical dc negative high voltage, low voltage to use carbon brush tip dc high corona, high speed to release a large number of electronic (e -), and electron cannot is present in the air for a long time (electronic life exists only nS), will be immediately oxygen (O2) to catch in the air, www.dongfeng-motor.com thus forming motor electric a device of the negative ions. Simple anion generator, negative ion increased to hypnosis, stop sweat, analgesia, stomachic, refreshment, eliminate fatigue. Anion generator, 220 v ac mains after rectification to the C2 and C3 charging, charging when C2 to hydrogen bubble small diesel generator conduction and trigger SCR conduction, C3 SCR, B L1 fan cover discharge, after B induction booster, D2 reverse rectification by 8 kv dc make generator M high ionization and produce negative ions.

The role of the current transformer is used to measure the larger current

The role of the current transformer is used to measure larger current, current transformer is a kind of current commutation device, symbols for CT. Its role is to put the large current into a small current, supply measuring instrument and relay the current chart, indirect measurement by large current. But also can isolate high voltage, to ensure the safety of staff and secondary equipment. Current transformer secondary side current is 5 Why can't a current transformer secondary side circuit? Current transformer secondary side is not allowed to open operation. In the current transformer secondary coil on the instrument coil impedance is small, the equivalent of running in the secondary coil short-circuit condition. Transformer secondary coil terminal voltage on only a few volts. Of the magnetic flux in core is very small. Although primary coil magnetomotive force can reach hundreds or thousands of Ann ampere-turns or larger. But most were established by short circuit secondary coil demagnetization magnetomotive force offset, only a small fraction of excitation magnetomotive force as the core to establish a magnetic flux in the core. 


If in running the secondary coil disconnection, vice side current is equal to zero, then the demagnetization effect of magnetomotive force disappears, and the original edge of magnetomotive force is constant, the original edge measured current all become excitation current, this will make the iron core of sharp, magnetic ac motor flux core severe fever that burn out the coil insulation, or make the high side of short circuit. Other electric fan motor secondary coil wholesalemotor.blogspot.com open out the high voltage is induced, it is very dangerous for instrument and operators so current transformer secondary side is not allowed to disconnect. Why can't a voltage transformer secondary side short circuit? If the short circuit in the operation of the secondary side lamination of voltage transformer, secondary coil impedance decrease greatly, can appear a lot of short circuit current, make the secondary coil burned due to severe fever. So in the operation of the transformer are not allowed to short circuit. General voltage transformer secondary side with a fuse. Only transformer of 35 kv and below, on the high side have a fuse when transformer short-circuit the purpose is to put it cut off from the high voltage circuit.

PLC control two pump start-up failure solutions to problems

Situation:in the double liang steam double-effect lithium bromide absorption air-conditioning unit,the use of omron PLC (PA204S C200HE-CPU42,power supply) to control the start of two pumps. When,in turn,start the two pumps,often led to the suspension of the power of the PLC,thus stop running program.Second,the detection of 1,use the meter to measure the voltage electric motor 12v 500w waveform of two pump ordinal startup PLC power PA204S ac voltage of the power supply change found:when did not start the electrical motor 12v 1000w pump,the voltage of the power supply is normal,when start the two pumps,instantaneous fell to the power supply voltage of 184 v,184 v and the duration of the above 25 ms,PLC to stop working,and to determine the effect of pump power of PLC.2,in order to solve this problem,respectively for the following tests: A) driving the pump first,delay around 10 s to start small pump,power supply voltage drop to about 190 v,the instructions first,pump makes instantaneous voltage drops,later start small pump,affect smaller,but it need to modify the PLC program.


B) because the pump power supply is turned by high tension line through a transformer,transformer capacity,can be considered a large capacity of transformer,may make the pump will be smaller influence on the PLC power supply voltage.C) in the PLC power supply termination a large capacitance,but the effect is not obvious.D) finally in one power supply transformer converted by a 220 v power supply to PLC,found that even in the start two pumps at the same time,PLC power supply voltage drop is only about 204 v,204 v,the can.Conclusion:as a result acmotortrading.blogspot.com of the PLC power supply is supplied with water pump in the same way,and the plant's transformer capacity is small,so in the start two pumps,caused the PLC power supply voltage drops below 85% of rated voltage,and duration of more than 10 ms,resulting in PLC detected power interruption,stop working. So the advice from the transformer converted one by one in the 220 v power to separate for PLC,which can solve the problem.

Stepping motor control signal isolation circuit

Stepping motor control signal isolating circuit, stepper motor control signals have 3 (CLK, the CW, ENABLE), respectively control the Angle and speed of the motor, and can make positive and negative direction of motor, shall be connected to the chip after the optical coupling isolation. Coupling effect of light, there are two: first, prevent damage of the motor disturbance and interface board circuit; Second, the control signal for plastic. The CLK, the CW signal, choose medium speed or high speed light coupling, ensure the signal coupling is not going to happen after the lag and distortion and influence motor drive, and drive plate can meet the higher pulse frequency drive requirements. This design choose 2 slices of 6 n137 high-speed optical coupling isolation CLK, the CW, the signal transmission rate can be up to 10 MHz, 1 slice TLP521 ordinary optical coupling isolation the 3 phase induction motor ENABLE signal. Note: when the optical coupling direction and reverse output connection; Optical coupling of AC synchronous generator the forward and backward power should be fan cover a separate isolation power, otherwise can't play the role www.dongfeng-motor.com of isolation interference.

Brushless motor

Permanent magnet brushless motor is mainly composed of rotation (rotor) and three set of uniform distribution of the coil (stator), surrounded by a coil of the stator is fixed on the outside. Current flows through the coil magnetic field, three groups of overlay each other to form a magnetic field vector field. electric motor 12v 500w By respectively control the size of three groups on the coil current, we creates an arbitrary direction and magnitude of stator magnetic field. At the same time, through the attraction and repulsion between the stator and rotor magnetic field and torque can be controlled freely. For the arbitrary Angle of rotor and stator are an optimization of the magnetic field direction, can produce a maximum torque; Also, the stator can produce a magnetic generator set spare parts field direction of the torque output. Simply put, if the stator magnetic field generated and permanent magnet rotor magnetic field direction, motor will not output any moment. 

In this case, there are two magnetic field motor electric force of each other, but because of the force direction of rotation and the rotor, so the two magnetic field makes the bearing pressure, have not generated any rotary force. On the other hand, if the stator magnetic field direction orthogonal to the rotor magnetic field direction, it will wholesalemotor.blogspot.com generate a force to the rotor rotation, and this is also the location of the maximum torque. Any direction and size of the stator magnetic field can be divided into parallel and perpendicular to the two components of the rotor magnetic field direction. Such, mutually orthogonal magnetic field to produce rotary force, and parallel magnetic field is produced on the bearing pressure. For this reason, an efficient brushless motor driven function is to reduce the magnetic field of parallel to each other and to maximize the mutually orthogonal magnetic fields.

The classification and characteristics of ac regulated power supply

Able to provide a stable voltage and frequency of power supply according to ac regulated power supply.At present most domestic manufacturers is the work done by ac voltage stability.Below the market some ac regulated power supply,the classification characteristics. motor vehicle spare parts Parameter adjustment (resonance):this kind of regulated power supply,voltage stability is the basic principle of LC series resonance,the early type of magnetic saturation voltage stabilizer is belong to this category.It has the advantage of simple structure,without many of the components,reliability is quite high ac electric motor voltage range is wide,strong anti-jamming and resistance to overload ability.The disadvantage is that large energy consumption,noise big,bulky and high cost.On the basis of the principle of magnetic saturation of development into the formation parameters voltage stabilizer and China have been popular in the 50 s of "magnetic amplifier gather digital ac voltage stabilizer" (614) are the principle of ac voltage stabilizer.Autoformer (than) gather: 1,mechanical pressure regulating type,i.e.,according to the servo motor to drive the carbon brushes in autotransformer winding sliding surface move,change Vo on the ratio of the Vi,in order to realize the adjustment of the output voltage and stability.

The voltage stabilizer can from several hundred to several kilowatts.It is characterized by simple structure,low cost,the output waveform distortion small; But because the carbon brush sliding contact are prone to edm,brush damage that burned and failure; Slow speed and voltage regulation.Type 2,change the tap,autotransformer to make multiple fixed tap,through a relay or SCR (SSR) as switch machine 10,automatically change the tap position,so as to realize the stability of output voltage.This type of circuit voltage regulator the method is simple,wide voltage stabilizing range (130 v to 280 v),high efficiency (95%) or higher,the price is low.While the disadvantage is that low voltage stabilizing precision (plus or minus 8 ~ 10%) working life is short,it is suitable for the family to the air conditioner power supply.Power voltage compensation type electrical motor - purifying type (including precise voltage stabilizer) it USES compensation link to realize the output voltage stability,easy to implement microcomputer control.It has the advantage of good anti-jamming performance,high precision voltage (+ / - 1%) or less,fast response (40 ~ 60 ms),simple circuit,reliable operation.

The disadvantage is that: with the computer,program-controlled switches,such as nonlinear load are low frequency oscillation phenomenon; Input side current distortion degree is big,the source power factor is low; The output voltage to input voltage phase shift.Against interference function to demand higher units,it is advisable to apply in the city,computer power supply,must choose the computer about 2 to 3 times the total power voltage regulator to use.Because has stabilized,anti-jamming,the advantages of fast response speed,moderate price,so widely used.Switching regulated power supply: it is applied to the high frequency pulse width modulation technology,and it is the difference between general switch power supply output must be with the input side of the same frequency and phase ac voltage.It had quasi square wave output voltage wave type,type of ladder wave,sine wave,etc.,in the market for uninterruptible power supply (UPS) from the storage power supplies and chargers,ac voltage regulator is a switch mode power supply voltage regulator and control function is strong,easy to realize intelligent,is a very promising ac regulated power supply.But because of its circuit www.facebook.com/dongfeng.motor is complex,the price is higher,so to promote more slowly.

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.

The working principle of four-way reversing valve

When electric motor price the electromagnetic valve is not electricity,work on the refrigeration system and the role of control valves for spring 1,valve core moves to the left side,is in a state of release,capillary E and C connected at this time. www.facebook.com/guohong.trading Because E on the low pressure suction tube,capillary C and main valve inside the left space for the low pressure,high pressure gas nozzle enters the main valve by the main valve,the main valve piston I vent in the right end of the space to become a high pressure,promote the main valve valve core is moved to the left,nozzle and nozzle 1 2 connecting the nozzle with the nozzle 3 in 4 and status form the refrigeration cycle system When the solenoid valve electricity,electromagnetic force pull-up control valve valve core to the right,capillary E connected to D. ac motor The main valve in the right space become low voltage,high pressure gas is entered into the main valve piston lamination II vent in the left space,promote the valve core to move to the right end,nozzle and nozzle 3 2 connecting the nozzle with the nozzle 1 in 4 and the function of the evaporator,condenser,exchange,system is transformed into heating circulation state.

Ac voltage measurement

In order to grasp the change situation of IC ac signal,can be used with the dB jack multimeter ac electric motor 12v 500w voltage electrical motor 24v to approximate measure of IC.Detection multimeter under ac voltage blocking,pens and insert the dB jack;For no dB jack multimeter,need in pens and concatenated a 0.1 ~ 0.5 u F condenser.The method is suitable for the working frequency is low IC,such as television video amplifier stage,field scanning circuit,etc.Due to acmotortrading.blogspot.com the inherent frequency of the circuit,waveform is different,so the measured data is an approximation,for reference only.

Frequency conversion air conditioning inverter upper arm trigger and drive

"Three phase six take" trigger circuit of the upper arm three power tube circuit is three independent circuits, so to provide electric motor 12v 500w power supply switch power supply has three secondary windings. We analyze one of the circuit can know the working principle of the two remaining road. Upper arm circuit output phase voltage U work. Under the figure marked element of V and W phase for generator set spare parts the corresponding element, the output of the two groups after the voltage required for the operation of the V and W phase control signals. IC2 for CPU control light lotus root, make compressor circuit and main circuit isolation. CPU ac motor triggered by light lotus root IC2 drive signal, the output trigger signal to trigger the u and in IPM terminals u constitute a loop. Eu power tube unit circuit of acmotortrading.blogspot.com voltage access IPM as power supply, and terminal U make loop. The power supply circuit of the public side of U is U phase voltage variable frequency ac output.

Troubleshoot general steps - to determine the point of failure

According to the failure phenomenon,combined with the principle of equipment and control characteristics analysis and judgment,determine the scope of the fault occurred in what,electrical fault or mechanical electrical motor failure,is a dc circuit or ac circuit,main circuit and control circuit or auxiliary circuit,power supply part or parameter adjustment www.facebook.com/guohong.trading is caused by the inappropriate,man-made or randomness and so on,gradually narrowing the scope of the fault,until find the point of failure.If lack of system of diagnosis information,you need the whole ac induction motor equipment maintenance personnel correctly or control system is divided into several pieces,then check the parts of the input and output is normal.When determining a certain part,and then to focus on the part of the internal problems,find out diesel generators prices the point of failure.Under the condition of ensure the safety of equipment,can pass some test method to determine the fault position.Electricity to test,for example,or to make a relay action,etc.,to find and determine fault location.

Ac voltage measurement

In order to grasp the change situation of IC ac signal,can be used with the dB jack multimeter ac electric motor 12v 500w voltage electrical motor 24v to approximate measure of IC.Detection multimeter under ac voltage blocking,pens and insert the dB jack;For no dB jack multimeter,need in pens and concatenated a 0.1 ~ 0.5 u F condenser.The method is suitable for the working frequency is low IC,such as television video amplifier stage,field scanning circuit,etc.Due to acmotortrading.blogspot.com the inherent frequency of the circuit,waveform is different,so the measured data is an approximation,for reference only.

The working principle of pump and fan - tubular fan

In recent years,thanks to the development of air conditioning technology requires a small volume,low noise,pressure head properly and easy to match the buildings on the installation of small fan.Tubular fan is wholesalemotor.blogspot.com to adapt to the requirements of the new fan.Tubular fan main features is as follows (figure 1,6):(1) are generally more vane impeller forward leaf type,but the two end face is closed.(2) the width of the impeller b without limit,when the width increasing.Flow also increases.(3) tubular fan don't like the centrifugal ac electric motor fan is on the chassis sides open axial airflow into the fan,but open chassis part directly radial flow into the fan.Air flow across the leaf twice.Adding some auxiliary fan in the impeller of the fixed guide vane,to improve the air condition.(4) on the performance,the efficiency of auxiliary fan is low,generally about 30% 50%.ac motor capacitor (5) the air inlet and outlet are rectangular,easy to match the building.diesel generators prices Tubular fan still exist many problems to be solved.Especially the geometric shape of each part has a significant effect on its performance.Imperfect structure and completely unable to work,but small turbine is steadily expanding the scope of application of the fan.

The application of squirrel-cage asynchronous motor soft starter - the traditional method for motor starting

Squirrel-cage motor direct total pressure of the large current when starting the motor stator coil and produce very big impact,rat cage bar damage caused squirrel-cage winding insulation and faults,cause 8500w gasoline generator motor failure; Large current will produce a lot of heat,winding insulation damage,reducing the life of the motor.Can be used to increase the power distribution capacity or limitation of motor starting current method to solve the above problems.If only increase the distribution capacity for starting motor,it is not economic.Therefore,usually equipped with limit starting device of generator generator set motor starting current.The commonly used methods are: 1) the stator cascade reactor or resistance starting.Stator reactance starting,reduces the starting current,but also reduces the starting voltage and starting torque is reduced more.Therefore,stator reactor step- down starting applies only to the electrical motor light load motor starting. 


2) ya a delta step-down starting.Ya a delta step-down starting is also applicable to the light load motor starting,and limited to the normal operation of delta connection of the motor.Louboutin leather plant low pressure air compressor motor is to use this way. 3) the autotransformer step-down starting.Using autotransformer step-down starting,compared with the direct starting,starting voltage reduced a lot (for the rated voltage of 1/4,1/7),and the starting torque to reduce more; And autotransformer is wholesalemotor.blogspot.com not allowed to frequent starting,which limits its wide use. 4) yanbian triangle step-down starting.Yanbian triangle is made after the starting of motor,tap can't change,limiting the application of yanbian triangle starting method.These belong to step decompression starter,start-up mode and obvious shortcomings,namely the secondary impact appeared in the process of starting current.

Ac voltage measurement

 In order to grasp the change situation of IC ac signal,can be used with the dB jack multimeter ac electric motor 12v 500w voltage electrical motor 24v to approximate measure of IC.Detection multimeter under ac voltage blocking,pens and insert the dB jack;For no dB jack multimeter,need in pens and concatenated a 0.1 ~ 0.5 u F condenser.The method is suitable for the working frequency is low IC,such as television video amplifier stage,field scanning circuit,etc.Due to acmotortrading.blogspot.com the inherent frequency of the circuit,waveform is different,so the measured data is an approximation,for reference only.

Pump and fan - jet pump working principle

 The high pressure working fluid 7,by the pressure vessel nozzle 6 to work,can become high-speed kinetic energy after the nozzle pressure,the liquid (or gas) to go outside of the nozzle. At this time due to the nozzle exit and the diffusion asynchronous motor by high-speed room 2 throat cause vacuum suction chamber 5,so that the suction fluid,eight continue to motor run capacitor come into and work fluid mixing,and then through the diffusion chamber would carry out pressure slightly elevated. Because of the working fluid continuous injection,suction chamber remain a vacuum,so being ac electric motor constantly suction and discharge fluid.Working fluid to high pressure steam,can also be used for high pressure water,the former is called steam jet pump,which is called the water jet ejector. This kind of pump in a refrigeration system is relatively rare.

Troubleshoot general steps - symptoms analysis

 Symptom analysis electric motors price is for all possible information about fault original state is collected and judgment process.Before the fault indications interference,for all the information should be carefully analyzed.The original information in general can be obtained from the following aspects:1.Ask for details of equipment failure phenomenon to operators.By asking for equipment use and situation before and after the change motor magnet process,damage or failure of information,also can learn some similar past failure phenomenon,reasons and have measures,etc.Operators may sometimes because of other reasons,not willing to or can't put all the plot clearly.Maintenance personnel should be analysis to distinguish ability and enough patience,to get the real original information as much as possible.2.Observe and preliminary examination.By watching heard touch,check whether such as cracking,noise,odors,overheating and other special phenomenon.

Observation of the equipment to conduct a comprehensive tend to get valuable clues.Work station of the content of the preliminary examination including detection device (light,display and alarm information,etc.),check the position of the switch,and operation control mechanism,adjusting device and the signal device,etc.3.Sure,in the absence of any dangerous electric test.Normally according to normal operating procedures www.facebook.com/dongfeng.motor shall require the operator to boot device.If the fault is not the whole machine of the electrical control system paralysis,can adopt the method of test run to start the equipment,help a comprehensive maintenance personnel for fault state of the original impression.Some electrical fault can be by hand,eye,nose,ear,use the means such as see hear touch,directly perceived failure equipment abnormal temperature rise,vibration,odor,noise,etc.,of the equipment fault can be located.The electrical motor 24v purpose of this phase is to collect the fault of the original information,so that to the current actual situation analysis,and to derive the most possible fault area of clues,check reference as the next step.But be careful not to sign according to the imprecise or not sufficient information to judge prematurely.

What maintenance electrician to specific professional skills

A door technology can foothold in society.Maintenance electrician belongs to technical professionals,our country is lack of senior technicians,if electric motor 12v 500w you learn good,also is very promising in the future.Main master electrician: maintenance electrician knowledge and basic skills,indoor wiring installation,grounding device installation and maintenance,repair and maintenance of common transformer,disassembling and maintenance of various commonly used motor,commonly used low voltage apparatus and distribution equipment installation and maintenance,motor control circuit basic installation and maintenance,commonly used machine tools installation and maintenance of electrical wiring,electronic circuit installation and debugging,acmotortrading.blogspot.com electrical control circuit design,programmable power electric motors controller and its application.As to hard to learn,the key see yourself don't work hard,go for it,have confidence in myself,should be able to learn well.

Pump and fan vane

Pump and fan is to use plus can denier conveying fluid permanent magnet motor fluid machinery.They are widely used in gas and heating and ventilation.According to the working principle of pump and fan,usually they can be classified as follows:Vane pump and the fan motor run capacitor is rotating,the main structure fixed casing and impeller blade.Of fluid work through the rotation of the impeller,allowing fluid to diesel generating gain energy.According to the fluid flow conditions,they then can be divided into the following several kinds: 1.wholesalemotor.blogspot.com The centrifugal pump and fan;2.Axial flow pump and fan;3.The mixed flow pump and fan,the fan is a combination of the first two.4.Tubular fan.

Multimeter application technique measurement techniques

 1,speakers,headphones,moving coil microphone:R x 1 Ω file,any pens and connect one end,another pens and touch point at the other end,normal when ringing sound "da" sound. If you 8500w gasoline generator don't ring,is the coil is broken,if the noise small,sharp,is a brush ring problem,also cannot use.2,measuring capacitance,resistance,according to choose the proper range of capacitance,and pay attention to the measurement for the electrolytic capacitor black pens and to answer the capacitor anode. (1) and microwave method to estimate the size of the capacitance level:but by experience or reference standard permanent magnet motor capacitance of the same capacity,according to the most greatly to determine pointer swing. Refers to pressure values of capacitance,as well as long as the same capacity,such as estimated one 100 mu F / 100 v capacitance can be used a 100 mu F / 25 v capacitance to the reference,as long as they are of the same pointer swing the biggest,as can be concluded that capacity. 


(2),estimated skin level capacitance size:to use R x 10 k Ω file,but only to over 1000 pf capacitance measurement. Capacitance of pf 1000 or older,whose hands slightly swing,as long as you can think capacity is enough. (3),whether the capacitor leakage measurement:the one thousand micro capacitance method above,can use first R x 10 Ω file its quick charge,and preliminarily estimate the capacitance,then change to the R x 1 k Ω file continue to test for a while,then the pointer should not return,and shall be parked at or very close up,or have a wholesalemotor.blogspot.com leakage phenomenon. To timing or oscillation under some dozens of MFD capacitor (such as color TV switch power oscillation capacitance),high efficiency electric motor and the leakage characteristic requirement is very high,can't be used as long as a slight leakage,then can be in R x 1 k Ω file again after filling the electric switch to R x 10 k Ω file continue measurement,whose hands should be parked in the same up and not return.

The structure and working principle of electromagnetic ac contactor

Structure:(1) the contactor is mainly com posed of electromagnetic system,contact system,arc extinguishing system and other parts.(1) the electromagnetic system:electromagnetic system,including electromagnetic coil and core is an important component of the contactor,rely on it to drive the contact closing and opening.electric fan motor (2) contact system:contact with the executive branch of contactor,including main contact and auxiliary contact.The role of the main contact is switched on and off the main circuit,control a larger current,and the auxiliary contact is electric motor 12v 500w in the control circuit,in order to meet the requirements of various kinds of control mode.(3) arc extinguishing system:arc extinguishing device to ensure off contact circuit,the electric arc reliable quench,reduce arc of contact damage.In order to quickly extinguished disconnected arc,contactor usually equipped with arc extinguishing device,generally USES half a longitudinal seam sealing clay arcing cover,with a ac induction motor 110kw strong magnetic blast circuit.(4) other parts:the insulation shell,spring,short circuit ring,transmission mechanism,etc.


(2) working principle:when the electromagnetic coil is not energized the contactor,wholesalemotor.blogspot.com spring reaction force and bit core of gravity to keep main contact disconnected position.When the electromagnetic coil through control circuit on the control voltage (generally rated voltage),the electromagnetic force to overcome the spring inhale armature reaction to the static iron core,drive the main contact closure,processing circuit,auxiliary contacts with the action.