显示标签为“gost standard electrical motor”的博文。显示所有博文
显示标签为“gost standard electrical motor”的博文。显示所有博文

2014年9月25日星期四

Three-phase asynchronous motor efficiency and power factor


 Induction motor efficiency and power factor is contradictory.For the same kind of Y series motor,high efficiency,low power factor.On the other hand,low efficiency,high power factor,high power,good for motor use;The power factor is low,will reduce the network transmission efficiency,because of low power factor,so the grid reactive power loss is big.So for ac induction attack efficiency indicators put forward higher requirements of wholesalemotor.blogspot.com both,puts forward higher requirements to the power factor index.The efficient and high voltage three-phase asynchronous motor,it overcomes the defect of old asynchronous motor,its insulation thickness thinning by the original unilateral 1.5 mm to 1.3 mm;Innovation design of star - Angle joint series hybrid hard winding method,reduce the stray loss of the motor,greatly improving the efficiency of the high voltage motor;Motor efficiency is low,the loss is big.For ac motor,is the resistance loss,in this way,the greater the loss of P in the power triangle,the greater the power factor Angle phi is smaller,the greater the power factor cos phi.Conversely,high efficiency,low loss,P is in the power triangle is smaller,the power factor Angle phi is smaller,the power factor cos phi is smaller.In order to satisfy the motor power factor,efficiency,two indicators,the backward of the structural design of centrifugal fan,a significant reduction in the high efficiency high pressure loss in the three-phase asynchronous motor machinery and noise.

The efficient high-voltage three-phase asynchronous motor can not only improve the work efficiency of the motor,and can also achieve the goal of reducing energy consumption,will be widely used in power stations,petrochemical,urban water supply,cement,paper making,metallurgy,coal and other industries,has an extremely extensive application prospect in the market,has significant economic and social benefits.Shell directly related to the personal safety and equipment protection grade selection of reliable operation,should be based on motor using occasions,to prevent human exposure to the motor internal dangerous parts,prevent solid foreign body into the chassis,prevent water from entering the shell cause harmful effects to the motor.Motor by letters IP protection grade plus two characteristics of Numbers,the first characteristic figures show that Motor vehicle the solid proof,the second feature figures show that the liquid.It is widely used in industry and People's Daily life.This kind of motor stator system group composed of group working system and starting winding.Its working principle are similar to those of three-phase asynchronous motor.The author through the analysis of the working principle of the single-phase capacitor motor to illustrate its positive &negative or transform a one-way operation of single-phase capacitor motor for positive and negative transfer lines of practical control circuit.

A.Simple working principle 1.When you don't answer the capacitance starting winding can a single phase or three phase asynchronous motor starting or running conditions,in terms of this item is set to the current in the winding of motor in whether can produce a rotating magnetic field.If not in the starting system group of the single-phase capacitor motor concatenated appropriate capacitor Tend to attend.If you want to improve the power factor,should reduce the motor air gap,increase the serial number of turns per phase.And rotor balancing machine to improve efficiency,increase should be ac motor air gap,which can reduce the harmonic stray loss,due to the harmonic stray loss and air gap of 1.5 ~ 1.6 power ratio.The two measures the reverse.When turn the timer can't start again,to the motor shaft by hand a little at this time can turn the rotation of the external force.After inspection found that the washing machine in the two capacitors,there is a short circuit phenomenon in a capacitor,the only change after short circuit capacitor in the same specification,then turn the timer when the normal operation of washing machines.In the washing machine motor is the typical positive &negative use capacitor motor control mode.Single-phase capacitor start motor is one of the single-phase asynchronous motor.

2014年9月1日星期一

permanent magnet synchronous motor mainly by permanent magnet synchronous motor rotor



The structure of the permanent magnet synchronous motor mainly by permanent magnet synchronous motor rotor,end cover,and composed of parts such as stator.In general,the biggest feature is its permanent magnet synchronous motor stator structure with the ordinary induction motor structure is very,very similar,is the main difference in the rotor's unique structure form the difference with other motor.The biggest different and common asynchronous motor is the unique structure of the rotor,the rotor with high quality on the permanent magnet poles.Placed on the rotor position of permanent acmotor2.blogspot.com magnets have many choices,so permanent magnet synchronous motor is usually divided into three categories: embedded,stickers and plug-in,as shown in figure 1.1.The performance of the permanent magnet synchronous motor is one of the most popular,there are many factors that can affect their performance,but the main is the structure of the permanent magnet synchronous motor.In terms of type,plug-in and embedded stick,all sorts of structure are all have their respective advantages. Stickers of the permanent magnet synchronous motor is the most widely used in the industry,its most main reason is electrical motor 12v 1000wthat it has a lot of other forms of motor incomparable advantages,such as its manufacture is convenient,the relatively small rotational inertia and simple structure etc.

And this type of permanent magnet synchronous motor is more easy to be the designer for the optimization of the design,one of the main methods are designed to approximate sine distribution of the air gap flux distribution structure,change the distribution structure to sine distribution can bring many advantages,for example,it brings negative effect,can reduce the harmonics of the magnetic field and the application of the above method can well improve the permanent magnet motors for sale running performance of the machine.Plug in the structure of the motor can compared with stickers of the motor is greatly improved because of its full use of it to design the structure of magnetic chain with asymmetry generated unique reluctance torque can greatly improve the power density of the motor,and can be easily produced,so the structure of permanent magnet synchronous motor is more used in the transmission system,but its shortcoming is also very prominent,such as production costs and compared with the stickers of the magnetic flux leakage coefficient is much larger.Embedded in the permanent magnet synchronous motor of permanent magnet is placed in the interior of the rotor,although in comparison to its structure is more complex,but there are a few obvious advantage is beyond doubt,because there are with high air gap flux density,the obvious compared it with stickers of the motor can produce a large torque;Because in the installation of the rotor permanent magnet is embedded in the choice,so by permanent magnet demagnetization after ac geared motor brought about by a series of dangerous possibility will be small,so the motor can run under higher rotate speed but does not need to consider whether the permanent magnets in the rotor will be destroyed because of the centrifugal force is too large.
To reflect the superior performance of the permanent magnet synchronous motor,compared with the traditional asynchronous motor to permanent magnet synchronous motor in particular,the most common type of rare earth permanent magnet synchronous motor with simple structure,high reliability;Very small volume,light quality special;Loss is relatively small,the efficiency is high;The shape and size of the motor can be obvious advantages such as flexible change.Precisely because it has so many advantages so that its application scope is very broad,almost throughout the aerospace,defense,industrial and agricultural production and daily life and so on each domain.Compared with permanent magnet synchronous motor and induction motor,consider not input reactive excitation current,so can be very obvious enhancement On its power factor,thus reducing the stator current and the stator resistance loss,and at the time of stable operation without the loss on the rotor resistance,which can reduce fan due to reduce the total loss of (small capacity motor can even without a fan) and the corresponding wind mill loss,compared with the same specifications of the induction motor with efficiency can be improved 2-8%.

2014年8月3日星期日

Motor variable frequency speed control applications

When using frequency control of motor speed,need to process requirements,saving benefit,such as payback period of investment is taken into consideration.If only from the technological requirements,saving benefit consideration,the following several ways to choose a variable frequency drive (VFD) Variable frequency speed regulation by frequency converter,for the determination of the capacity of the inverter is very important.Ac frequency conversion speed regulation method is three- phase asynchronous motor speed governing of the most promising method.With the continuous development of power electronic technology,reliable performance,matching complete,the price is cheap inverter will appear constantly,this technology will be more extensive and widespread application.At
present,the foreign advanced countries of frequency conversion technology is miniaturization,high reliability,resistance to pollution,multi-function,high performance,such as direction,is to speed up the pace of development in our country.Ac variable frequency speed regulation technology has been widely used in the industrial developed countries.The United States has 60% - 65% of the electricity used for motor drive,due to the effective use of the frequency control of motor speed technology,industrial transmission electricity saves only 15% - 20% of the electricity.Transmission speed change system,the use of variable frequency speed regulation can make the speed control system structure is simple,control accuracy,and easy to realize process control.Replace mechanical variable speed with frequency control of motor speed.Such as: machine tools,not only can save complex gearbox,also can improve the precision and satisfies the requirement of process control.

Using frequency control of motor speed instead of gate or baffle,is used to adjust flow in fan,water pump,compressor,etc.For example: the boiler water pump,fan,induced draft fan with frequency control of motor speed control,not only save the servo amplifier,electric operator,Y series three-phase asynchronous motor actuators and the water supply valve (or back plate),and makes the whole boiler
boiler control system has been fast dynamic response,high control accuracy and stability.Adopts frequency control of motor speed,one is the speed according to requirements,the second is energy conservation.It is mainly based on the following factors:(1) variable frequency speed regulation system itself loss is small,high work efficiency.(2) the motor at low slip always keep running state,reduce the loss of rotor.(3) can realize the soft opening and brake function,decrease the starting current impact.Reasonable capacity selection itself is a kind wholesalemotor.blogspot.com of energy saving measures.According to the existing data and experience,there are three more simple method:(1) motor actual power First of all,to determine the actual motor power,in order to select the inverter capacity.(2) the formula method of safety coefficient is 1.05,the capacity of the inverter Pb for Pb = 1.05 Pm/hm x cosy (kW) Type of Pm motor load; Hm power for the motor.After calculate the Pb,in inverter product catalog can choose the specific specification.For n In the rated current of the motor,the n of the Numbers for the motor.In any case,cannot be used in continuous more than rated current (I).(3) the motor rated current inverter frequency converter capacity selection motor parts process,is actually a process the best match between the inverter and motor,relatively safe is the most common,also make the converter capacity is greater than or equal to the motor rated power,but want to consider the actual power of the motor in the actual match what differ with rated power,are usually selected equipment capacity is big,but the actual ability to small,so according to the actual power of the motor to select frequency converter is reasonable,avoid to choose the frequency converter is too large,increased investment.The frequency control of motor rotor balancing machinespeed has many advantages,but also has its disadvantages,the main problem is the containing higher harmonic current is more,except to the power grid pollution also increase the motor itself loss,fever caused by motor.Again,the technique of the transducer expensive,long investment recovery,complex,especially in realizing closed-loop automatic control,technical processing is also required.In addition,the frequency converter is not any case,if the motor load change is not big,or deep well pump is equipped with a water tower,power saving,water saving effect is not large,unfavorable use frequency control of motor speed.According to the technological requirements,production line or single equipment need to program or adjust the motor speed according to the requirement.Such as: packaging machine transmission system,according to the different varieties of products,need.

2014年7月31日星期四

Y (IP44) three-phase asynchronous motor has the following good performance and structural features


(1) high efficiency level.Y series (IP44) small rotor three-phase asynchronous motor to keep the J02 series motor efficiency level is higher,the advantages of the weighted average efficiency is 0.413% higher than J02 series,Reached the international level.Due to the improvement of motor efficiency,has brought the huge power saving economic benefits to society.(2) the starting performance is better.Y series (IP44) motor series of locked-rotor torque than 33% higher than the average J02 series motor,starting torque reach JQ02 series high starting torque motor level,The minimum torque had guaranteed in more than 0.8 times the rated torque,and most also meet or exceed 1 times the rated torque.Therefore,the starting performance is very good,with load Starting is also very well.(3) low noise small vibration.Y series (IP44) audio power noise standards set by the three-phase asynchronous motor,according to the noise limit is divided into l and 2,for users to choose.Due to this series adopts special motor With bearing,thus greatly reduce running noise,checked by actual measured the noise lower than J02 series actual level for about 5-10
decibels,vibration is better than J02 series motor has decreased significantly.(4) the protective
performance is better.Y series (IP44) three-phase asynchronous motor's structure design has been
satisfied to the solid content and splash water protection requirements,so it can effectively prevent
the foreign body acmotor2.blogspot.com for motor and people The body of the damage.(5) the reliable running long service life.Y series (IP44) three-phase asynchronous motor's winding adopts class B insulation.When no more than 1000 meters above sea level,the temperature of the cooling centrifugal pump air is not more than 40 ℃,the motor Son of winding temperature rise limit method (resistance) less than 80 k.Therefore,in addition to a handful of electric motive specifications generally have more than 15 k temperature margin.The rise of temperature of the large margin can Extend the service life of motor and improve the reliability of the motor running.(6) beautiful appearance and easy.Y series (IP44) three-phase asynchronous motor end cover,connection Box cover,wind the appearance of main structure parts,such as older than traditional products to beautiful,generous.All series motor than J02 series volume shrink by an average of 15%,the average weight Reduce 12%.

2014年6月30日星期一

MC series 0.5hp single phase motor

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