Switch the role of the two

 Cast Iron electrical motor auto spare parts 
Specifications
1. 20 years manufacturing experience 
2. competitive price,high quality
3. Delivery Detail:within 10 days after receiving deposit 
The PBX is the organ of industrial enterprises and mines in the internal telephone switching a special-purpose switches, its basic function is to complete the unit internal users can talk to each other, but also is equipped with in and out of the trunk can be connected to the PSTN network and network in the city of user calls (including local calls, domestic long distance calls and international calls). Because this kind of exchange is a special unit interior, therefore, can according to customer's need to increase the number of additional properties for the ease of use. So this kind of switch has great flexibility. ANP gost motor The PBX is an important part of the option, is one of the local switches added equipment, because it is used for a lot of traffic between the unit internal users, reduce the traffic load option. 


gost motor 7.5kw

Specifications
1. effiency: IE2 and IE1 
2. 20 years manufacturing experience 
3. 12 months guarantee 

4. low noise and vibtration
Another user switches scattered in electric generator various units set, closer to the user, thus shortening the distance between the subscriber line, save the cable users. At the same time with a small number of discrepancy trunk access option, have the effect of traffic concentration. In these ways, using the PBX has great economic significance. Therefore, in the construction of public network cannot lack the PBX. User switches on Single phase motor the technology of using SPC is the development trend of the PBX, adopts the new type of program-controlled digital subscriber switches can not only exchange phone business, and can exchange data, and so on the words business, achieve a variety of business exchange and transmission.

Sensorless brushless dc motor control - a back emf method

 AC induction cooling fan motor 
Specifications
1. Customised
2. good quality
3. 20 years manufacturing experience
4. Altitude: ≤1000m

Assume that during the T T 1 0 ~ G5, G6 conduction, dangling a photograph, as shown in figure 1 (a), is a phase back emf ea = U an (a) phase voltage phase, a phase voltage U ag = U + U ng = an ea + U ng. At t0 time, ea = 0, b and c two phase current, on the other hand, and that the impedance is equal, and by the small diesel generator back emf waveform is known: the eb + ec = 0, so U ng = 1/2 U d, so U ag = ea + U ng = 1/2 U d. As long as it can detect or U an U d (U ag - 1/2) of the zero point, can be indirectly detect the zero moment of ea. Because the testing point ahead of the next converter 30 °, can be after 1/12 inverter cycle delay, shut off the G5, trigger conduction G1, which can ensure the maximum average electromagnetic torque motor can continuously produce. Repeat the above process, detection of ea in turn another zero and eb, ec all zero, and also delay, in turn trigger conduction of generator set spare parts a, b, c three-phase bridge arm up and down, to ensure the correctness of the permanent magnet brushless dc motor reversing sequence. 


Y2 series electric motor wholesale

Specifications
1. effiency: IE2 and IE1 
2. 20 years manufacturing experience 
3. 12 months guarantee 
4. low noise and vibtration 

5. AC Voltage: 220V/380V, 380V/660V,400V/690V,220V/400V

According to different detection objects, and the detection method can respectively called phase voltage method (test U an), the terminal voltage method (U ag). Among them, the terminal voltage method, the application of more. In terminal voltage method, in order to realize the phase voltage of zero crossing detection, first U ag, U can be the bg, U CG input low pass filtering devices, respectively, in order to eliminate the can seriously interfere with the back emf waveform, that there is no clear chopper signals passing zero [4]. And then use www.facebook.com/dongfeng.motor a voltage comparator, respectively each phase voltage compared to zero level, according to the comparison results of coding signal encoding, to get the rotor position signal. At present, the selection of zero level as shown in figure 2 [2], mostly by V, V b, V c three-phase symmetric star connection level V 0 instead of the center of the resistance of the circuit. Abroad recently put forward a new method: the three opposite electric potential (replace) with phase voltage first by square wave into a balanced three-phase sine wave, again through the star connection, get the central level, instead of a zero level. This method can get accurate "0" (zero after balanced three-phase sine wave synthesis), can reduce the position detection error.

Submersible pump motor repair 10 points for attention

 Mine submersible pump motor electromagnetic part and ordinary motor basic same,therefore,electromagnetic failure and repair,but due to the particularity of explosion-proof motor.In carries on the repair or reconstruction,it shall comply with the following provisions: The relevant personnel should understand,repair units and the relevant national laws and regulations,explosion-proof standards for repair work and the relevant provisions of the qualified products.Second,the unit should have for explosion-proof motor repair process equipment and the necessary inspection and test apparatus.Before three,maintenance,should prepare the necessary technical data.Four,commissioning before the motor repair,check the cable entry,relay protection and wiring system,to ensure that the company is still in good condition and conform to the requirement of explosion protection.Five,to engage in explosion-proof motor maintenance personnel should undertake the necessary training.After six,after inspection and acceptance of the inspection items,is made by authorization of the explosion-proof test unit or recognition,can be in repair units; 

Think it is necessary to project still explosion-proof test unit by explosion-proof inspection unit.After repair,explosion-proof motor should be to use the department to provide the following documents: 1) fault inspection;2) repair work instructions;3) Motor vehicle replacement and repair parts catalog;4) inspection and test results;5) repair certificate.Eight,are not allowed to repair the piano pieces 1) by the size of glass,plastic or other unstable parts made of materials;2) fasteners;3) the manufacturer or explosion-proof code that can't repair parts,such as encapsulation component.A sign of nine,after the repair will not affect the explosion-proof performance of repair,after repair without repair.Ten,the flame-proof certification after after repair motor repair the repair unit inspection department shall issue certificate of approval.Described above shall include at least by repairing the name,type,specification,water pump explosion-proof motor logo,the name of the class units and its approval certificate number,explosion-proof certificate number,date of repair,etc.The standard code for GB3836.13-1997 after the repair.Signs must be norm,durable,and resistant to chemical corrosion.Signs should be metal materials,commonly permanently fixed on the motor after the repair,repair again,after repair,the previous repair sign shall be removed.

Capacitance recognition

1,the capacitance in circuit "C" and is commonly used in digital representation (such as a capacitor C13 said Numbers for 13). Capacitor is made up of two pieces of metal film,close to the middle separated by electric motors 12 volt insulating material and components. The characteristics of capacitance communication mainly blocking circulation. The size of the capacitance is said to store electrical energy,the size of the capacitance effect is called the capacitive reactance of ac signal,it is associated with the frequency of the ac signal and capacitance.Capacitive reactance XC = 1/2 PI c f (f is the frequency of the ac signal,capacitance c said) is commonly used in telephone with electrolytic capacitor,the kinds of ceramics capacitors,SMD capacitors,monolithic capacitors,tantalum capacitors,polyester capacitors,etc. brake rotor 2,capacitance recognition methods: identification method of capacitance and resistance identification method of basic same,straight standard method,three kinds of color standard method and standard method. 

The basic unit of capacitance with ferrari (F),according to other units include: milli single phase electric motor method (mF),micro method (uF),sodium (nF),leather (pF).Among them: 1 q = 10 3 mm = 10 6 micro method = 9,10 = 10 12 leather method of large capacity capacitor on capacitance directly to mark its capacity values,such as 10 uF / 16 v capacity small capacitance of its capacity value with letters or Numbers on the capacitance letter notation: 1 m = 1000 uF p2 = 1.2 PF 1: n = 1000 PF digital wholesalemotor.blogspot.com representation commonly used three figures show that the size,two significant figures,said before the third digit ratio. Such as: 102 said 10 x 102 = 1000 pf pf said 22 224 x 224 = 0.22 uF pf 3,the capacitance error table F G J K L M allowed error of plus or minus 1% plus or minus 2% plus or minus 5% plus or minus 10% plus or minus 15% plus or minus 20%,such as: a ceramics capacitors for 104 J said capacity of 0. 1 uF,the error of plus or minus 5%.