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

A 75 kw micro can WIN - G9 inverter commissioning the strange phenomenon.Due to the input of the inverter is standard 50 hz sine wave,and the inverter output frequency and waveform permanent magnet motor are differs greatly with the input.Based on the principle of transformer is clip-on ammeter when measuring is dozens of times of the normal (different waveform and harmonic,frequency converter is produced by the thousand Hz level analog sine wave or square wave).If use resistor shunt type current meter measurement,error is not obvious.asynchronous motor As for runtime because of the reduced harmonic component,after feedback current waveform closer to sine wave,so the difference is small,if the series resistor shunt ammeter is basic and calculation results will be very close.(with a current transformer also can produce the same results as the clip-on sheet).Points out that caused by improper use instrument,the measuring error.Also thought that due to the problem of measuring instrument,can lead to inaccurate measurements.


Old electrician,sometimes are under the yoke of experience.But on the frequency converter operation panel display current and clip-on table by measuring current value is similar.The conventional current transformer measurement output current value is not very accurate.As noted.The output of the inverter is ten thousands of square wave voltage.After is connected to the load current is similar to sine wave.But the fundamental wave for the high frequency component.Clip-on ammeter,current transformer,will be used to conventional transformer.Due to the hysteresis effect,unresponsive to the change of high frequency current.Current transformer,the frequency converter of tailor-made,USES hall element to detect the current changes.There is plenty of strain rate.And in the subsequent circuit design has considered the characteristics of high frequency high efficiency electric motor current sampling.So only factory setting accurate,and can reflect the actual size of the current value.If not to pipe the size of the input current,the light output so much of the current,and after loading output current instead of smaller.What's your opinion? Feel free to comment.

Switch mode dc regulated power supply

And linear regulated power supply is a different kind of unstable power supply switch type dc regulated power supply,its mini electric motor circuit pattern mainly has single-ended flyback type,single straight shock type,half bridge type,push-pull and full bridge.It and the fundamental difference lies in its linear power supply transformer does not work in the power frequency but work in a few thousand Hertz to a few MHZ.Function is not working in the saturation and cutoff region namely switch state;Switch power supply,hence the name.Switching power supply has the advantage of small volume,light weight,stable and reliable;Disadvantages relative to the linear power supply ripple is bigger (usually 1% or less VO (P - P),good can do more than 10 mV (P - P) or smaller).Its power from a few watts - kw are products.

Price - ten yuan to 3 yuan /,the following classification is www.facebook.com/dongfeng.motor usually

used to introduce several kinds of switching power supply:(1),AC/DC power supply: the power supply is

also called a power supply,its energy from the power grid,after get a DC high voltage,high voltage

rectifier filter for DC/DC converter in the output of one or several steady DC voltage,power

products,from a few watts - kw for different occasions.Belong to the specifications of these products is various,according to user needs a power supply in communication power supply (AC220 input,DC48V or 24 v output) also is such.(2),DC/DC power supply,also known as the secondary power supply in the communication system,it is provided by a DC battery power or a DC input voltage,the DC/DC conversion later in one or several DC voltage output.(3),communication power supply,communication power supply which is essentially a DC/DC power converter type,but it generally in DC - 48 v or 24 v power supply,a backup and backup battery for DC power supply,DC power supply voltage electric motors 12 volt transform into the working voltage of circuit,it generally divides the central power supply three kinds of power supply,power supply and veneer,in which the highest reliability.(4),radio power: radio AC220V / 110 V power supply input,output,DC13.8 V power by the power supply electric power,several hundreds of Ann are products.In order to prevent the AC power grid affect radio work,and need to have as a backup battery,so this kind of power supply in addition to a 13.8 V dc output voltage,also with functions of

automatic conversion recharging the battery.(5),modules,power supply,along with the rapid development

of science and technology,the power supply reliability,capacity/volume demand is higher and higher,the module power supply is more and more shows its superiority,its high working frequency,small volume,high reliability,easy to install and composite expansion,so more and more widely used.

At present,although the current domestic has the corresponding module production,but was unable to catch up with the advanced international production technology,high failure rate.DC/DC module power supply at present although the cost is higher,but from the product of a long cycle of the application of the overall cost of the view,especially because of system failure due to the high maintenance cost and the loss of goodwill,with the power supply module or economical value,is also worth mentioning here is in roche converter circuit,it is the prominent advantages of simple circuit structure,high efficiency and output voltage and current ripple values close to zero.6,special power supply,high voltage low current power supply,high current power supply,400 hz input AC/DC power supply,ac electric motor etc.,can be attributed to such,can be selected according to specific needs.Switch power supply,the price is in commonly 2 to 8 yuan/tile special low power and high power power price is a bit high,up to 11-13 yuan/watt.

Brushless synchronous generator is how to generate electricity?

Three-phase brushless synchronous generator excitation system are connected by a coaxial communication issue of ac exciter,after rotating rectifier rectifier for direct current (dc), Then sent to the generator exciting winding.Ac exciter is rotating armature type of three-phase medium frequency generator,the diesel generators prices frequency of www.dongfeng-motor.com generator frequency three times Left electricalmotor1.blogspot.com and right sides,which can improve the perkins diesel generator setexcitation response speed.Exciting winding is stationary,controlled by the automatic voltage regulator AVR excitation.Rotating rectifier Have high reliability,using the three-phase half wave bridge rectifier and three-phase full-wave bridge rectifier,firmly fixed on the rotor,with the current measurement And fault indicating device.

380 v motor circuit of PVC cable selection table

380 v motor circuit of PVC cable selection table.Note: according to electric vehicle motor the specification for design of low-voltage distribution GB50054-95, S (was) phase line conductor section 16 or less, use the cross section such as the electric motor cooling fanfour core cable; Phase line conductor cross section 16 < S (was) 35, or less with PE line section 4 core cable for wholesalemotor.blogspot.com 16 (was); Phase line conductor cross-section (was) > 35 S, with PE line cross section for the S / 2 (was) 4 core

cable.

0.75KW YC/YC2 capacitors series single phase ac electric motors

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