The inverter no-load current is greater than the load current

A 75 kw micro can WIN - G9 inverter commissioning the strange phenomenon.In the process of commissioning,occasionally with current clip-on table test about the three phase output current of frequency converter,more found an amazing phenomenon! The station frequency converter input and output current is completely out of proportion,there is a difference of more than 10 times! 40 electrical motor a current in the output,the input current for several amperes,hardly measured;In 100 a current output,measured input current is only 8 a here! Strange ah,do not conform to the law of conservation of energy.100 a output current change out from?!Like a leaky pipe,into the water,1 and motor run capacitor out 10 water,ShuiGuanZi cannot change water inside.As we all know,in general,the inverter input current is always less than the output current.

The reason for the dc circuit of energy storage capacitor,as if on the motor end installed a ark of reactive power compensation.When inverter no load or light load,part electricalmotor1.blogspot.com is provided by energy storage capacitor current to the load,reduce inverter current from the power grid.And as the increase of load,the input current in proportion to increase,when input rated load,frequency converter input current and output current should be nearly equal.Such as when the output of 40 year input took only a few amp;Output is 100 a,the input current has amounted to 70 a.The output current of 140 a,the ac induction motor input current is almost reached this value.Under normal circumstances,there are differences between the input and output current,but won't produce differences such as the aforementioned gaps.Huge difference made me wonder if measuring instrument is broken.In the table,measure it again,still same result.

Motor domestic development

Industry experts point out that,during the "tenth five-year plan,due to the rapid development of

national economy,small and medium-sized motor production originally puts forward the goal of" tenth five-year plan "period was substantial planning.Happy is more than that.Accelerate industry consolidation,consolidation of the small and medium-sized motor have begun.At present,our country nearly 2000 large and small motor factory,although enterprises large number,but is quite a number of small businesses.Experts point out that,because of the large manufacturers,production form the mutual competition seize market demand situation.Product quality is uneven,mutually interacting,the phenomenon such as competition,low-margin industry,has become affect motor is the main reason for the enterprise survival and development.According to the China motor manufacturing industry transformation and upgrading of production and marketing demand forecasting and analysis report preview "statistical data show that gm products production growth,other special series motors are derived products also have larger growth,for example,vibration motor,vibrating screen,frequency conversion motor,elevator,diving submersible motor,injection molding machine motor,permanent magnet synchronous motor,ac servo motor,etc.New product development and achieved good results.

Development during the period of "tenth five-year" to the cold heat permanent magnet motors for

salegeneration "Y3 series three-phase asynchronous motor,in April 2002,has passed the

expert appraisal,is the national promotion.In addition,on the main series of derived using cold-

rolled silicon steel sheet updated products development work is in progress,such as high efficiency

motor,www.dongfeng-motor.com low noise,low vibration motor,low voltage high power motor series,IP23 low-voltage motor series,etc.As the motor manufacturing industry competition are growing,large motor manufacturing enterprise mergers and acquisitions between integration and capital operation has become increasingly frequent,more and more attention to the industry at home and abroad excellent motor manufacturing enterprise market research,especially on the enterprise development environment and the further research of customer demand trends.Because of this,a large number of domestic and foreign excellent motor brand rise rapidly,becoming the best motor manufacturing industry.Motor itself is labor-intensive products,reach a certain scale of production is very difficult to make profit,profit is very low,so the industry of national electrical industry employees about 300000 people,2003 industry profit is only 280 million yuan.According to understand,even in some benefit better business,net profit last year amounted to less than 5%.

At the same time,because most of the small enterprise production process does not pass,motor industry,there are a lot of the quality of the product is unqualified phenomenon.Motor

enterprise in our country,according to the survey of the waste,defective products,as well as the

return product loss on average around 10%,and foreign ac motor wind generator developed countries motor enterprise is unqualified for the average 0.3%.In recent years,our country's motor industry is a group of production scale,product level,good quality,advanced technology and equipment of the enterprise.But,no one share of the products can be accounted for in the domestic market dominance.Small and medium-sized motor has yet to form a brand with international influence.Motor industry single phase capacitor start induction motor needs to integrate,evolution,it has become the trend of the development of motor industry.The expert points out,although it is an old traditional industrial motor industry,but all walks of life form a complete set of motor are indispensable.And some of the larger motor enterprise covers an area of big,a lot of well,after the acquisition,will bring the acquirer very generous benefits and financial resources.

The diagram of three-phase asynchronous motor

In the industrial field, three-phase asynchronous motor because of its easy to use, high efficiency, was welcomed by many factories. A lot of people for this device, also began to have a preliminary understanding. And this kind of three-phase asynchronous motor, but also the emergence of a three-phase asynchronous motor diagram. A lot of people don't know such figure how what kind of role, also some people don't understand. Really want to say to the role of, or more. www.facebook.com/dongfeng.motor First: to know the motor vehicle spare parts working principle of three-phase asynchronous motor The three-phase asynchronous motor, chart for some people who do not understand, is very confused. In fact, as long as people will look at the picture, through this picture, can know what is the working principle of three-phase asynchronous motor. And through such a working principle, can also learn about the three phase asynchronous motor is used in what areas. The second: know how to work through the three-phase asynchronous motor Through such a figure, also can let people know how to let the three-phase asynchronous motor, according to their own needs. So that the three-phase asynchronous motor can also according to their needs, to work and production. Third: learn how to asynchronous motor for three-phase asynchronous motor operation Most people for three-phase asynchronous motor is not very familiar with, although know the principle, but still don't know how to operate. However, map can help people to solve this problem, it can let people know that if the operation for three-phase asynchronous motor, so as to avoid because of not operating and the embarrassment. This is the diagram of three-phase asynchronous motor. In addition, such as three phase asynchronous motor wiring diagram, can bring people a lot of useful information, help people better understand the operation of the three-phase asynchronous motor, etc.