Inverter maintenance detection commonly used method

 Motor parts electric motor fan cover 
Specifications
1.Customised 
2. good quality 
3. 20 years manufacturing experience 
In converter maintenance process, often encounter three phase induction motor all sorts of problems, such as peripheral circuit, parameter setting bad or mechanical failure. If is the inverter failure, which is part of www.dongfeng-motor.com the problem, how to judge slightly is introduced here. A, static testing: 1, testing rectifier circuit. Find converter internal dc power supply ac synchronous generator side and N and P, dispatch multimeter to resistance X10, red table bar got P, black table rods respectively in auto spare parts accordance with to R, S, T, there should be about a few of the resistance, and the basic balance. Instead received a black watch rod P side, squirrel cage single phase motor induction motor red table rods in turn received R, S, T, there is a close to the infinite value. Received a red table rod N side, repeat the above steps, alternator generator should get the same results. We can determine if you have the following as A result, the circuit is abnormal, a. resistance unbalanced three-phase, failure can explain rectifier bridge. B. red table welding P side bar, the resistance is infinite, can be concluded that rectifier bridge failure or malfunctioning of the starting resistance. 2, test the inverter circuit. Received a red table rod P side, black table rods respectively to meet U, V, W, there should be a dozens of the resistance, and resistance in basic same, reverse phase should be infinite. Received a black watch acmotor2.blogspot.com ac motor rod N side, repeat the above steps should get the same results, otherwise can determine fault inverter module

Single-phase transformer economical efficiency

 AC Induction Plastic motor fan 
Specifications
1. Customised 
2. good quality 
3. 20 years manufacturing experience
Face up to the application of single-phase transformer in our country, single-phase transformer and single-phase power supply technology has been developing, as early as the late 1950 s to the single- phase transformer have exported abroad. Over the years, the development of science and technology to promote the Three phase motor development of the single-phase transformer, roll core, amorphous iron core technology application in the single-phase transformer, can greatly reduce the loss in the transformer core. According to the analysis, after the urban and rural power grid renovation to a certain degree, the network loss share will greatly reduce the line loss, no-load loss of distribution transformer will make up the main status of the network loss. 

Y2 series 0.75kW (1HP) AC Motor for Speed Control
Specifications
1. effiency: IE2 and IE1 
2. 20 years manufacturing experience 
3. 12 months guarantee 

4. low noise and vibtration 
Only greatly reduce the loss of iron core, is expected electric fan motor parts to reduce the loss of grid power. Therefore, the roll core, amorphous iron core single-phase transformer has great development potential. At present, the three-phase transformer and three-phase centralized power supply system is still dominant, single-phase transformer and single- phase power supply generator set system is its supplement. Practical application in transformer, we should make full use of three-phase transformer single-phase transformer and their respective advantages and characteristics, according to load condition to choose suitable varieties of transformer, power supply radius with power in economy

Switch to choose factor

generator Stator Rotor 

Specifications
1. 20 years manufacturing experience 
2. competitive price,high quality 

3. Accessories Series: stator and rotor 
 (1), back bandwidth, exchange of two/three layer throughput. This determines the actual performance of the network, regardless of the switch function, more management more convenient, if the actual throughput, the network will only become overcrowded. So these three parameters is one of the most important. Bandwidth backplane includes ac electric motor exchange between the switch port, port and switch inside the bandwidth data exchange and internal system data exchange. Layer 2/3 switching throughput performance of two/three layer exchange actual throughput, the throughput should be greater than or equal to switch ∑ (ports (bandwidth). (2), VLAN type and amount, a switch to support more VLAN type and quantity will be more convenient for the design and implementation of network topology. (3), TRUNKING, current switches support this feature, and also not too widely in practical application, so people think that as long as the support this function, how many lines are not required to provide maximum binding. (4), switch port number and type, different applications have different needs, depending on the specific magnet generator situation. (5), support network management protocol and methods. Need to switch to provide more convenient and centralized management.


AC Electric motor Plastic fan parts 

Specifications
1. Customised 
2. good quality 
3. 20 years manufacturing experience 

4. Delivery Detail: 20-35 days after receiving payment 
 (6) priority control, Qos, 802.1 q, 802.1 X, 802.3 X support, these are all switches the direction of development, these functions can provide better network traffic control and user management, procurement support these function switches should be considered. (7), stack, as users increase, the stack, it is very important. General corporate expansion method of switch port connection points for a main switch the port switch, this switch and main switch maximum data transfer rate is only 100 m, greatly influenced the exchange of performance, if we can adopt the stacking mode, its in G bandwidth will play a huge role. Main parameters are stacked number stack, stack method, bandwidth, etc. (8), switches, and the exchange of cache cache, main memory, and port forwarding delay is also quite important parameters, such as. (9), for layer 3 switches, 802.1 d production is also an important parameter in the tree, this function can let the Single phase motor switch to the network structure, learning on the performance of the network also has a lot of help. (10), layer 3 switches and some important parameters, such as launch other function whether two/three keep wire-speed forwarding, routing table size, and the size of the access control list, right by the protocol support, support for multicast protocol, packet filtering method, the machine ability to scale is worth considering the parameters, such as, should according to the actual situation.

To solve the problem of oil leakage

 1, product improvement: for porcelain set of oil leakage at the bottom of the transformer, because of the maintenance condition, can only be replaced with a new transformer. Will oil leakage transformer permanent magnet motor to return factory repair, and ask the manufacturer to improve the sealing structure. The transformer oil leakage, timely communication with the manufacturer recommended manufacturers choose better quality rubber motor magnet gasket, explore the possibility of using new material packing. 2, the process of making the maintenance plan for now a terminal oil leakage transformer by Taiwan to apply for stop service, timely deal with oil leakage. For found no oil leakage transformer maintenance plan, equipment stop service with a porcelain on the surface of the flange bolt fastening. During the overhaul of random overhaul of main transformer transformer terminal change once a gasket. 3, the pass of maintenance process: in the transformer overhaul the repair technology to the health of equipment has a decisive role. 

Pass of maintenance technique, in case for overhaul quality caused by defective equipment: such as wiring fever caused by poor contact, non-standard oil caused by false oil level and test unqualified, the bad weather caused insulation be affected with damp be affected with damp. In the concrete work of this notice. In particular, when a terminal assembly, porcelain set of inner arc bakelite pad should be paid attention to in installation surface must with porcelain set wall stick take, otherwise will lead to a terminal external after fastening flange surface tilt, make rubber gasket cannot even tighten and easy broken porcelain bushing. 4, product selection, now wholesalemotor.blogspot.com know, a growing number of oil-immersed transformer is replaced by SF6 transformers, the use of SF6 transformer can reduce many make the electrical motor 24v daily maintenance work, the only worry is leak problem, now understand of SF6 transformer leakage rate in a few parts per thousand, but now the oil-immersed transformer oil leakage rate in percentage more than a dozen, even a few decades. I think that using SF6 transformers very much worth considering.

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.

What are the regulations on motor operation and matters needing attention?

(1) motor under the condition of rated cooling,according to the rated data stipulated in the factory brand of the running,do not allow the limitation of ambiguous motor run blindly.(2) the motor coil and iron core of maximum monitoring temperature should be according to the provisions of the factory,such as the factory did not make clear a regulation should be according to the provisions of the table below,the motor runs in any circumstance should not exceed the temperature rise.Insulation class A grade B E F,resistance thermometer resistance thermometer resistance thermometer measurement method,static son 220v electric motor winding temperature rise of the temperature rise of 506060757080,8595100110105115,static iron core temperature,607580,95100115,the above-mentioned numerical temperature when the environment temperature of 35 ℃ (3) allows the temperature of the motor bearings,should abide by the provisions of the factory.No manufacturing rules,according to the following provisions: A,for the sliding bearing,shall not exceed 80 ℃.B,for rolling bearing,shall not exceed 100 ℃ (poor quality of oils and fats,do not exceed 85 ℃) 

(4) motor can be changed at rated voltage general-5% to + 10% within the scope of operation,its rating unchanged.(5) the motor run in rating,and voltage unbalance rate shall not be greater than 5%,the difference of three phase current shall not be greater than 10%.(6) the motor is running,in each bearing measured vibration shall not exceed the provisions of the table below: motor speed vibration value (double amplitude) mm,3000 rpm0.05,1500 rpm0.085,1000 rpm0.10,750 RPM and below 0.12 Motor in the process of running in addition to the strict rules,should also pay attention to the following questions: (1) the current of the motor under normal circumstances should not exceed allowable values,the difference between the three phase current shall not be greater than 10%.(2) sound and smell: motor start capacitor during normal operation of the sound should be IE2/IE3 electric motor uniform normal,no noise;No coke smell or smoke near the motor,if found to have different sounds,measures should be taken to processing coke smell or smoke.(3) the performance of the bearing,mainly is the lubrication situation,lubricating oil is normal,the temperature is high,whether there is sundry.(4) other situations,such as cooling www.dongfeng-

motor.com water system is normal,wound rotor motor brush on the slip ring is normal

operation.