Master electrical troubleshooting methods

Faults exclusion is an important work of maintenance personnel,to eliminate the fault,must know the cause of the failure,more important is can theoretically analysis,solve the fault occurred,should have certain professional theory knowledge,to permanent magnet generator master the methods of troubleshooting.(a) resistance test method:resistance test method is a commonly used method of measurement.Usually refers to the resistance using the multimeter,measure motor,lines,touch the top is in line with permanent magnet motors for sale the use of nominal value,and whether a method of on and off,or use the megohmmeter measuring phase phase,phase to the insulation resistance between the and so on.

Measurement,pay attention to the selection range and the accuracy of the check table,used by general resistance method is used to measure the general practice is to choose low first,when the circuit being measured should be paid more attention to whether there is a loop,and it is strictly prohibited to charged measurement.(2) voltage test method:test method is the use of multimeter corresponding voltage 12v motor profile,a method of measuring circuit voltage value.Usually measurement,sometimes measuring power source voltage,load,sometimes also measure the open circuit voltage,to determine the line is normal.Table should be paid attention to when measuring gear,choose the appropriate range,general measure is unknown or when the open circuit voltage usually choose ac voltage of the electricalmotor1.blogspot.com high-grade,to ensure that not in operation under high low voltage range,in order to avoid damage to the table.To measure dc at the same time,pay attention to the positive and negative polarity.

Motor common fault analysis and maintenance - the choice of the motor

1.According to the motor installed.Point of the surrounding environment to choose motor forms: rural common forms a protective type of motor and enclosed two kinds.Protection type ventilation performance is good,price is low,suitable for dry environment,place electrical motor USES less dust;If dirt is more,water splash,enclosed motor should be adopted.Such as agricultural and sideline products processing machinery and water pumps can be used in this kind of motor,in addition,there is a motor run capacitor sealed motor,bail can be immersed in the water work,this kind of motor electric submersible pump is adopted.2.According to use load condition,select the motor power: the power of the motor general should be in the production of electricalmotor1.blogspot.com mechanical power 1.1~1.5 times.If too much power to choose,not only to increase investment,but also reduces the mechanical efficiency,increase the cost of production.If power choice is too small,motor to bear too much load for a long time,can make temperature rise is too high and damage the insulation,shorten the motor to asynchronous motor make in life.3.According to the requirements of the machine speed motor and transmission way,speed and production machinery matching principle is to make the motor is running under the rated speed,the same way transmission.

The working principle of contactor

(a) as shown in figure l shape and structure diagram for ac contactor.Ac contactor is made up of four parts:(1) the electromagnetic mechanism electromagnetic institutions by the coil (armature) and static and dynamic core acmotor2.blogspot.com core component,its role is converting electromagnetic energy into mechanical energy,electromagnetic suction contact action.(2) the contact system Including the main contact and auxiliary contact.Main contact for on and off the main circuit,usually for three to normally open contacts.Auxiliary contact is used to control electric circuit,the electric interlocking effect,so it is also called interlocking contacts,normally open,normally closed two of each.(3) arc generator stator extinguishing device capacity has more than 10 a contactor in arc extinguishing device,for small capacity of contactor,often with double fracture contact arc extinguishing arc plate,electric arcing,alternate with arc and clay arcing cover arcing.For large capacity contactor,adopt longitudinal seam arcing cover and grid arcing.

(4) other parts including reaction spring,buffer spring,spring contact pressure,transmission mechanism and shell,etc.1 a arcing cover 2 a contact pressure spring 3 and 4 main contact a reaction a coil spring 5 6 a short circuit ring 7 8 a spring 9 move www.dongfeng-motor.com a static core core 10 a auxiliary normally open contact 11 a auxiliary normally closed contact of the working principle of electromagnetic contactor is as follows:after the coil current,flux and electromagnetic suction in core.The electromagnetic suction makes the armature and overcome the spring force,drive the contact agency action,open normally closed contact,normally open contact closure,interlock or connection.Coil loss of electricity or on both ends of the coil voltage decreased significantly,the electromagnetic force is less than the spring force,makes the armature release and contact agency reset,disconnect lines or terminate the interlock.Dc contactor (2) :the structure and working principle of dc contactor is basically the same as the ac contactor.On the structure and the electromagnetic mechanism,contact system single phase asynchronous motorand arc extinguishing device and other parts.Due to the dc arc than ac arc is difficult to extinguish,dc contactor magnetic blow type arc extinguishing device is often used to arcing.

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

motor running capacitor if during motor operation,a little bit more motor with load will stop.

motor startup mode,auto voltage reducing total pressure direct start starting

Total pressure directly starting:At both capacity and load of power grid allows total pressure

directly under the condition of starting,can consider to use the direct starting.Advantage is that

control is convenient,simple maintenance,And more economic.Mainly used in small power motor starting from saving energy point of view,should not be greater than 11 kw motor by this method. Auto voltage reducing starting:Using the autotransformer tapped the reduced pressure,can adapt to the needs of different load starting,and can get electric vehicle motor a bigger starting torque,is a kind of is often used to starting larger capacity The decompression starting mode of the motor.Its the biggest advantage is starting torque is bigger,when the tap at 80%,starting torque can be up to 64% of direct starting.and And can be tapped to adjust starting torque.Are still widely used. Y-delta starting:For the normal operation of the stator winding for delta connection squirrel-cage asynchronous motor,if at the time of starting the stator windings into star,waiting for start to end to pick up again Into a triangle,can reduce the starting current,reduce its impact on power grid.Such starting way is called star triangle decompression starting,or simply the star delta starter (y-delta Start).Using star delta starter,starting current is only according to the delta connection directly when starting a third of the original.If direct starting at the time of starting current to 6~7 meter,ie In the star triangle is starting,the starting current is 2~2.3 times.This means using star delta starter,starting torque is reduced to the original starting directly based on the www.dongfeng-motor.com triangular connection A third.

Suitable for the occasion of no load or light load starting.And compared with any other decompression starter,its structure is the most simple,the price is the cheapest.In addition,the star

A further advantage of triangle starting way,that is,when the load is lighter,can let the motor run

in y connection.At this point,the rated torque and load can match,so Can make the motor efficiency is

improved,and thus save the electricity consumption. Soft starter:This is using the phase shift voltage regulating principle of silicon controlled to realize the regulating of the motor starting,it is mainly used for motor starting control,starting effect is good but the cost is higher.Due to the Use the thyristor,thyristor harmonic interference is larger at work,have a certain influence on power grid.Additional power fluctuations will also affect the 8500w gasoline generator thyristor conduction,special How much is in the same grid thyristor devices.So the thyristor failure rate is higher,because involving power electronic technology,thus to maintenance technicians Please also is higher. Converter:Inverter is the highest technical content of modern motor control field,most complete control function,the best control effect of motor control device,it by changing the frequency of the power grid Power saving motivation of rotational speed and torque.Because of involving power electronic technology,computer technology,so the cost is high,too high to the requirement of maintenance technicians,mainly used in accordingly Need to speed and areas of high speed control requirements.

Filler cap

Electric hammer,electric pick etc tools have filler cap,how is perkins diesel generator

setthe plastic material,can be special wrench or circlip pliers,long nose pliers in the

filler cap two eyes spin down,convenient and filling.Filler cap of fault slip wire or untight

seal,oil spill.Slide wire is not serious,can be wrapped around some ribbons,hemp

rope,cord,etc.;Serious,convenient use thicker plastic bag on the filler

cap,www.facebook.com/guohong.trading then tap with a hammer,can also be bound once

or more times on electrician with black tape and then turned on.Looked at induction

motorthe untight seal,O ring aging,damage,loss,a new O ring should be replaced.

220V YCL high torque low rpm electrical motors single phase asynchronous water pumps run and start capacors IE1 IE2 CE GOST

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