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.

"The output relay" and "relay output"

Programmable controller (PC) when using ladder diagram as a programming language,the "output relay ladder diagram is electrical motor just a kind of visualization" soft relay ",PC output control effect through it,when it meets on motor run capacitor condition,the corresponding output but have the output signal.Output hardware implementation,may be able to switch output www.facebook.com/dongfeng.motor information of triode,bidirectional thyristor.When PC using relay output,is a relay contact to perform the asynchronous motor ladder diagram of the output relay output instructions.Therefore,is not to say that PC "output relay" can only use relay output mode.

Dc voltage measurement

This is a current situation,the multimeter dc voltage in the dc power supply voltage,measure the working voltage of peripheral components;Different IC pins of dc voltage value,and compared with the normal,and compression failure,find out the damaged components.When measured at 8 o 'clock to pay attention to the following:(1) the multimeter to want to have enough resistance,at least more than 10 times greater than the resistance of the circuit being measured,so as not to cause greater error of measurement.(2) usually put the potentiometer to the middle position,if it is a TV set,signal source to adopt standard color bar signal generator.(3) to take pens and asynchronous motor or probe anti-skid measures.For any instantaneous short circuit is easy to damage the IC.Can take the following methods to prevent the pens and sliding: take a bike with a valve core set of pen in the table,and the long table pen is about 0.5 mm or so,it can make the table pen well and the point contact under test,and motor run capacitor can effectively prevent the skid,and even meet with neighboring points can not short circuit.


(4) when the measured voltage does not accord with normal,a pin voltage should be based on the pin to IC normal work have important influence as well as the other pin voltage were analyzed,and the corresponding change to ac electric motor judge of IC.(5) IC pin voltage will be affected by peripheral components.As peripheral components occurs leakage,short circuit,open circuit or value,or peripheral circuit connection is a variable resistance value of the potentiometer,the location of the potentiometer arm,will make the change pin voltage.(6) if IC voltage is normal,the pin is thought IC is normal;If abnormal voltage IC part pin,it should maximize deviation from normal,check the peripheral components for XXX,if wholesalemotor.blogspot.com no failure,the IC is likely to be damaged.(7) for dynamic receivers,such as TV,in the presence of signal,IC pin voltage is different.If discover pin voltage should not change but change is big,the size and adjustable with the signal components of different locations and change but do not change,can determine the damage of the IC.(8) for a variety of ways of working device,such as video,work in a different way,each pin voltage IC are also different.

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.