the generator and the excitation current voltage regulation

1,the related properties of the generator and the excitation current voltage regulation can automatically adjust the excitation system become a modulated by voltage negative feedback control system.Reactive load current is the main cause of generator terminal voltage drop,when the exciting current is constant,voltage of the generator will be over Season fresh graduates to apply for a job

Open your career journey Resume writing written examination questions Dedicated to the interview guide professional abilities of civil servants The increase of reactive current.But in order to meet the requirements of users for the power quality,voltage of the generator should remain the same,basic way is to realize the magnet prices requirement along with the change of reactive current adjust the excitation current of generator.

2,the adjustment of reactive power,generator and system running in parallel,can be thought of as busbar operation with infinite power,to change the generator excitation current,also follow change,induced potential and stator current generator reactive current also follow wholesalemotor.blogspot.com changes at this time.When the generator in parallel operation with infinite system,in order to change the reactive power of generators,must adjust the excitation current of generator.Change at this time of generator excitation current is not usually say "surge",but just changed into the system reactive power.3,the distribution of the reactive load: parallel generator stator operation of generator according to their rated capacity,the distribution of the reactive current according to proportion.The large capacity generator should burden more reactive load,and the capacity of smaller negative provide less reactive load.In order to realize reactive power load can be automatically assigned by automatic pressure regulating excitation device,changing the input voltage of the generator excitation current to maintain its constant,also can adjust the inclination of the generator voltage regulation characteristics,in order to realize the parallel running generator three phase induction motor reactive power load of distribution.

The load current and no-load current of the machine

(1) asynchronous motor no-load running,set the current in the www.dongfeng-motor.com three-phase winding,referred to as the no-load current.Most of the no-load current is used to produce a rotating magnetic field,Is known as the no-load excitation current,no-load current of reactive component.There is a small part of no-load current is used to produce all kinds of power loss during no-load running (such as friction,ventilation and core loss),the no-load current is a part of the active component,due to account for the proportion of small,negligible.Therefore,light electricity Flow can be thought of reactive current.From this point of view,it is as small as possible,so that the power factor of the motor raised,the power supply is good. If no load current is big,because of the stator winding conductors carrying area is certain,allowed through current is certain,allows for active current only flows through the wire Can reduce,the motor can drive the load will be reduced,the motor output is reduced,with excessive load,the winding is easy to heat.But the no-load current Also cannot too small,otherwise will affect the other performance of the motor.Generally the no-load current of the small motor is about 30% ~ 70% of rated current,large and medium-sized electric The no-load current of the machine is about 20% ~ 40% of rated current.What is specific to the no-load current of an electric motor,on the motor nameplate or product acmotortrading.blogspot.com specifications,a Not marked.Have electrician often need to know how much is this value,this value to judge the quality of the motor repair,can use." (2) formula is the scene perkins diesel generator set quickly calculate motor no-load current of specific numerical formula,it is a lot of test data.It is in line with "the no-load current of the motor Is the 1/3 of its rated current ".At the same time it is in line with practice experience: "the no-load current motor lamination of the motor,shall not exceed the capacity of the kw number can be used for" the principle of (after repair Old,small capacity motor).Formula "capacity by about eighty percent for" refers to the general motor no-load current value was 0.8 times the number of motor rated capacity kw left On the right.No-load current of medium-sized,4 or 6 pole motor,is the number of motor capacity kw 0.8 times; The number of new series,large capacity,small 2 levels of motor,The no-load current calculation according to the number of "xinda sixty percent less"; For the old,old series,small capacity,the number of large more than 8 pole motor,the no-load current,Press "is a small number of very many kilowatts",namely the no-load current value approximately equal capacity kw,but is generally less than kilowatts.

good performance cheap high efficient ac induction motor

Three-phase vibrator motor and the three phase generator groove single pitch is 1-9 the motor winding is how to meet Should be 6 coil,three single,wholesalemotor.blogspot.com double,three 1-9 should be double.Inner ring is 135 head,inner ring,the interval of 2 phase,outer ring 246 star connection,usually double 8500w gasoline generator head.

Gear motor selection guide

In order to choose the most appropriate gear motor,it is necessary to understand the detailed

technical characteristics of the deceleration motor driven machine,you must define a using

coefficient of fB.Using coefficient of fB.The selection of electric vehicle motor gear motor first shall determine the following parameters:working hours a day; Start-stop times per hour; Cycle per hour; Reliability to O; Job machine torque T machine; The output rotational speed n; Load type; The environment temperature; The cooling conditions; Reducer is usually based on constant Torque,start stop not frequent,and design of room temperature. The www.dongfeng-motor.com allowable torque T be determined by the type:T=T out fB use coefficient X T-gear motor FB - reduction motor output torque using coefficient Transmission ratio(I)I=n into the P/n the motor power(kw)9550** n/P = T eta output torque T out(N.m)T=9550*P*eta/n type :n into - the input speed eta - reducer transmission efficiency When choosing gear motor,according to different working condition,must also satisfy the ac synchronous motor following conditions:1,2,T T a T work or machine machine type=fB*T always work :in fB - overall use factor,fB total=fB*KR fB1** KW fB - load characteristic coefficient,reliability coefficient KR - fB1 - environmental temperature The number; KW - cycle factor

Classification of motor

Ac motor Asynchronous motor Y series (low voltage,high voltage,frequency,electromagnetic brake) JSJ series (low voltage,high voltage,frequency,electromagnetic stator brake) Synchronous motor TD series TDMK series Dc motor Common dc motor Z2 series New generation of Z4 series A dedicated dc motor ZTP railway motor ZSN cement rotary kiln The use of the motor and control is very convenient and small electric motors has since starting,acceleration,braking,reverse and stopper live ability,can meet various operation requirements; The work of the motor High efficiency wholesalemotor.blogspot.com and no dust,smell,polluting the environment,the noise is small.Because of its series of advantages,so in industrial and agricultural production,transportation,national defense,business Industry www.facebook.com/guohong.trading and household appliances,medical electrical equipment and so on various aspects widely used.