2014年11月30日星期日

DBJ08-20-98 household electric equipment should meet the following standard


Stator And Rotor ac induction motor parts 
Specifications
1. 20 years manufacturing experience 
2. competitive price,high quality 

3. Material: silicon steel 
25, leakage with as for leakage protection (this is when the loop 30 ma leak current automatic trip, mainly to protect the human body electric shock), even with lighting line in Water pump theory, the home installs all the socket to match, but we suggest that only these wet with kitchen and toilet. Because good leakage protection is very sensitive and a bit of a electrician tape no good package, had a little auto spare parts leaking trip. In fact that 3 phase induction motor disclosure has no effect on the human body, especially in high power air conditioning, in 2 years after www.dongfeng-motor.com some internal components ageing slightly a little trip, this also is very troublesome. 



Y2 series high power China ac motor

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

4. low noise and vibtration 
There are a lot of alternator generator electrician also messing around, the following loop not leakage protection, and on the total open with a leakage protection. That you may have trouble, over 2 years home and that's a bit of a problem, contact point, casually or whatever that's a bit of a problem, electrical appliances, ha synchronous generator ha, I'm sorry, but the family there were no electricity! Of course, we don't seem to encounter this problem, ha ha, you think I am ac motor talking nonsense, that is diesel generator set 99.5% of the people do not have the correct use of the leakage protector. Leakage protector has a small button above, need you diesel engine to every few months to press, not to you for several years, probably won't play a role, that is, of course, don't jump.

Brushless dc servo motor characteristics

Electric Motors 1 HP 3PH
Specifications
1. Shape: squirrel cage
2. CE.ISO CCC 
3. Side Terminal Box 
4. Free Foot Mounting 

5. 100% copper wire 
Moment of inertia of small, low starting voltage and no-load current; Contact the reversing system, generator greatly improve the motor speed, maximum speed up to 100 RPM, 100; Brushless servo control in the implementation of the acmotor2.blogspot.com servo motor, squirrel cage induction motor without encoder also can realize single phase induction motor the control of speed, position, torque, etc; ac motors three phase induction motor generator There is 3 phase induction motor no brush wear condition, in addition to high speed, also has a long service life, low noise, diesel generator set no electromagnetic ac motors interference, etc.

A dc servo motor characteristic and the using range

Small power 3 phase ac induction motor
Specifications
1. 100% Copper Wire 
2. Voltage Tolerance 5% 
3. Aluminum, CE, ISO9001 

4. Factory Price 
 three phase induction motor 1. Small volume, fast response, large overload capacity, wide speed Water pump range. 2. The torque at low speed, small fluctuations, smooth operation. 3. Low noise, electric water pump high efficiency. 4. The back-end encoder feedback (optional) constitute dc servo, etc. Can be water pump price used in the dc servo motor is spark machine, alternator generator manipulator, precise machine, etc. Can configure 2500 p/R high analysis diesel generator set of standard encoders and speed measuring device, can add more with reducer, the mechanical device with reliable water pump price accuracy and high torque. Good speed regulation, the unit acmotortrading.blogspot.com weight and volume, the highest output power, greater squirrel cage induction motor than the ac motor, more than stepper motor. Multi-level structure of small torque fluctuation.

2014年11月27日星期四

Motor with the choice of circuit breaker



motor lamination three phase induction wound rotor 

Specifications
1. Lamination of electric motor 
2. IP54 class F 
3. 100% copper 
4. silicon steel stamping 

5.stunning performance 
Low voltage circuit breaker is www.facebook.com/guohong.trading generally divided into plastic shell type (also known three electric motors phase induction motor as the device type) and frame type (also called universal type) two kinds big. The motor under 380 v245kw and more choose molded case circuit breaker. Circuit breaker can be divided into the generator distribution line protection according to the use and protection, lighting protection circuit of the motor and electric leakage protection use and so on. 2.1 motor protection circuit breaker selection principles: (1) the set values for the long time delay current is equal to the rated current of the motor. (2) the instantaneous current setting: for the protection of cage motor circuit breaker, the adjusting current diesel engine instantaneous equal to 8 to 15 times the rated current of the motor, depending on the squirrel cage induction motor protected cage motor model, capacity and starting conditions. 


MS160 Electrical Induction Motor
Specifications
MS160 Electrical Induction Motor 
1.100% Copper Wire 
2.Voltage Tolerance 5% 
3.Aluminum , CE, ISO9001 

4.Factory Promotion IE2 
For wound rotor motor protection circuit breaker, the adjusting current instantaneous is equal to (3 ~ 6) times the rated current of the motor, diesel generator set depending on the protected wound rotor motor model, capacity and starting diesel generator set conditions. (3) 6 times of long time delay current setting value can return time is greater than or equal to the starting time of the motor. According to the weight of the starting load, can choose to return time 1 s, 3 s, 5 s, one of an 8 s, 15 s. 2.2 circuit water pump price breaker tripping device setting current simplified formula: "instant-on, motor kw 20 times" "thermal trip, according to the rating of the above formula is to protect a 380 v control of three-phase cage type motor circuit breakers, instantaneous motion setting its electromagnetic tripping current, according to the number of" kw "20 times". For thermal trip, according to the rated current of the motor selection.

Stepper motor and ac servo motor performance comparison different running performance



ac three phase asynchronous electric motor stator 

Specifications
1. 20 years manufacturing experience 

2. competitive price,high quality 
Stepper motor control for the open loop control, single phase motor start frequency is too high or too much load step easy appear lost or blocked, stops frequently occur high speed overshoot phenomenon, so as to ensure the control accuracy, should handle the ascending and descending speed acmotor2.blogspot.com problem. Ac servo single squirrel cage induction motor phase motor drive electric water pump system for closed-loop control, the actuator can small synchronous generator diesel engine be three phase induction motor directly to the 3 phase induction motor motor encoder feedback signal sampling, internal position loop and speed loop, ac induction motor general won't electric generator appear step motor lose step or overshoot phenomenon, more reliable control performance.

A dc servo motor characteristic and the using range

AC Induction Plastic motor fan 
Specifications
1. Customised 
2. good quality 

3. 20 years manufacturing experience
three phase induction motor 1. Small volume, fast response, large overload capacity, wide speed Water pump range. 2. The torque at low speed, small fluctuations, smooth operation. 3. Low noise, electric water pump high efficiency. 4. The back-end encoder feedback (optional) constitute dc servo, etc. Can be water pump price used in the dc servo motor is spark machine, alternator generator manipulator, precise machine, etc. Can configure 2500 p/R high analysis diesel generator set of standard encoders and speed measuring device, can add more with reducer, the mechanical device with reliable water pump price accuracy and high torque. Good speed regulation, the unit acmotortrading.blogspot.com weight and volume, the highest output power, greater squirrel cage induction motor than the ac motor, more than stepper motor. Multi-level structure of small torque fluctuation.

2014年11月26日星期三

Refrigerator take time to add liquid cooling method Refrigerator take time to add liquid cooling method



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
For refrigeration equipment repair, time is the second step of the general fault maintenance. The first is to suppress (not including the compressor or change tube) in determining the pipeline without leakage, the next step is to fit. There are two commonly used methods: 1, use the vacuum pump. You can also use a compressor to replace the vacuum pump. Time is longer than generator price with the vacuum pump is a few longer, because of the relative likelihood () compressor exhaust two (amount) to some smaller than vacuum diesel engine pump. On the fridge process pipe connected to a job with a pressure gauge valve, one head welding on the compressor, the other end with a liquid pipe connection on the vacuum pump, open the table method (valve) the door, start the vacuum pump or external compressor, start time, when there is no gas discharge vent on the vacuum pump, took over. 2, to use own compressor to itself. This method is very suitable for go out to repair, need not with vacuum pump. The method is: if the filter is on double tail, mouth open work (the original is www.dongfeng-motor.com welding die), start the compressor, there will be a lot of air from the mouth, when the mouth no gas discharge, the mouth with the hand, unplug the power supply. (be sure to pay attention to safety) open the charging the practice to the system such as refrigerating fluid, when the filter working gas discharge. In the mouth of tongs death, gas welding is used after sealing the mouth.???? 


motor lamination three phase induction wound rotor 

Specifications
1. Lamination of electric motor 
2. IP54 class F 
3. 100% copper 
4. silicon steel stamping 

5.stunning performance
Add liquid small diesel engine cooling: cooling liquid, add fluid tube, table after the valves are connected, open the charging the practice period of open (loosen) the end of the charging tube when the tube had cooling liquid discharge head, tighten the method of block (LAN). Open the table on the compressor valve, had better add liquid cooling liquid cylinders upside down, ac synchronous generator when the table shows 4 diesel generator set kg pressure, close the charging valve. The refrigerator electricity, then the pressure of the table with the work single phase induction motor of machine down. When the clock stability have a look at the pressure, generally between zero point three to zero point 8 belong to normal pressure. The static plus 4 kg is based on the refrigerator when the low pressure of static pressure is 4 times at work. As the refrigerator working time increased, the temperature in the oven has been falling, filled volume of the normal, running after a period of time on the muffler should meet (knot), temperature and environmental temperature is the same as the filter or a touch more heat for exactly. If acmotortrading.blogspot.com on the muffler by frosted) (cooling fluid add much, off some, open the charging valve slowly, let while observing muffler, see the frost charging valve shut. If a long time running back up the (gas) pipe temperature is not cool or without dew, open the charging valve and adding some refrigeration fluid. Practice has proved that the choice of low voltage motor fuse and maintenance fuse for low voltage motor phase short circuit, single phase short circuit fault and squirrel cage induction motor overload protection device is simple and effective. But if the fuse type and parameter selection, improper or disadvantage in operation and maintenance, also can not meet the expectations of protection.

Stepper motor and ac servo motor performance comparison different running performance

AC Induction Plastic motor fan 
Specifications
1. Customised 
2. good quality 

3. 20 years manufacturing experience 
Stepper motor control for the open loop control, single phase motor start frequency is too high or too much load step easy appear lost or blocked, stops frequently occur high speed overshoot phenomenon, so as to ensure the control accuracy, should handle the ascending and descending speed acmotor2.blogspot.com problem. Ac servo single squirrel cage induction motor phase motor drive electric water pump system for closed-loop control, the actuator can small synchronous generator diesel engine be three phase induction motor directly to the 3 phase induction motor motor encoder feedback signal sampling, internal position loop and speed loop, ac induction motor general won't electric generator appear step motor lose step or overshoot phenomenon, more reliable control performance.

Ac servo motor


ac three phase asynchronous electric motor stator 
Specifications
1. 20 years manufacturing experience 

2. competitive price,high quality 
The structure of the ac servo motor stator is basically similar to capacitance split-phase single- phase asynchronous motor. The stator is equipped with two position difference of 90 ° winding each other, one is Rf excitation winding, it always pick on the ac voltage Uf; L, another is the control winding connection control signal voltage generator Uc. So is also called the two ac servo motor servo motor. Ac servo motor rotor squirrel-cage often make it, but in order to make the servo motor has electric water pump a wide speed range, linear mechanical properties, there is no "rotation" phenomenon and the properties of fast response, it is compared 3 phase induction motor with the ordinary motor, should have the characteristics of small rotor resistance and moment of inertia of the two. 


MS160 Electrical Induction Motor

Specifications
MS160 Electrical Induction Motor 
1.100% Copper Wire 
2.Voltage Tolerance 5% 
3.Aluminum , CE, ISO9001 

4.Factory Promotion IE2
The rotor current is widely applied structure has two small diesel engine forms: one is using high diesel generator set resistivity of conductive materials high resistivity of the conducting bar cage rotor, in order to reduce the rotational inertia of the rotor, the rotor doing long and thin; Another kind is made of aluminum alloy hollow cup rotor, glass is very thin, only 0.2 0.3 mm, in order to reduce the magnetic resistance of magnetic circuit, should be placed in the hollow cup rotor stator fixed. The hollow cup rotor moment of www.facebook.com/guohong.trading inertia is small, responsive, and stable running, so widely used. Without the control voltage ac servo motor, the stator is water pump price only produced by the pulse excitation winding magnetic field, rotor motionless. When a control voltage, stator and then produce a rotating magnetic field, the rotor rotate along the direction of the rotating magnetic field, in the case of constant diesel alternator generator engine load, the speed of the motor changes with the size of the control voltage, when the control voltage of opposite phase, servo motor will be reversed.

ZT ac contactor selection of several main techniques and matters needing attention


motor lamination three phase induction wound rotor 
Specifications
1. Lamination of electric motor 
2. IP54 class F 
3. 100% copper 
4. silicon steel stamping 
5.stunning performance 
Contact parameters: the contactor's main contact 3 phase induction motor with double breakpoint bridge contact and single breakpoint finger contact two forms. The advantage of the former is with two effective generator price arcing area, arcing effect is good. Usually, rated voltage 380 v generator and below and rated current under 20 a and small capacity of ac contactor, use current 3 phase induction motor natural zero two near the cathode of the fracture effect can be extinguished arc. Rated current of 20 electric water pump ~ 80 a ac contactor, adding arc or using the circuit of the electric arc blowing conditions, have a double fracture to cooperate, can effectively arcing, but, to be reliable, sometimes still need to add gate or partition. If the rated current is larger than 80 a, ac contactor is double fracture of the main contact, the arcing must diesel generator set be equipped with arcing gate or adopt other arcing chamber. 


115/120 V AC Voltage and Three-phase Phase small 240v electric motor
Specifications
1.Specifications1.3-phase asynchronous motors 
2.IEC standard 
3.OEM 
4.Voltage:50HZ &60HZ;380V&415V 

5.Protection class: IP54 
Usually, the double fracture contact from smaller, structure is compact, small volume, also need not soft connection, therefore, to improve the diesel generator set mechanical life of contact. Double fracture contact parameters adjustment of inconvenience, however, generally no skid movement when closed, cannot remove oxide on the surface of the contact, so contact with silver or silver www.facebook.com/guohong.trading alloy materials, the high cost. Single fracture finger roll contactor in the process of closing a sliding movement, easy to remove the surface of the oxide, ensure reliable contact, so the contact can use copper or copper alloy materials, the cost is low. But with increasing of contact roller slide games contact mechanical wear. Since there is only one fracture, contact than double fracture alternator generator from big, so the volume is bigger also, dynamic contact should be through the soft connection external at the same time, so that the mechanical life is limited.

DBJ08-20-98 household electric equipment should meet the following standard

3, as people living standard rise, electric rice fort, microwave oven, air conditioner, electric kettle, electric spot squirrel cage induction motor chung person households, household electricity load is growing rapidly, 1 kw of power load is not enough, so DBJ08-20-94 household electricity load design power of 4 kw, watt-hour meter to choose 5 (20) A. Price increase of residents' income and household electrical appliances, make electric motor parts a home acmotor2.blogspot.com two air conditioners, color TV sets and squirrel cage induction motor computers in the home is not new, has prompted a surge in household electricity load again, therefore DBJ08-20-98 household small diesel engine electricity load design power increased generator to 4-8 kw by 4 kw. The Induction motor high standards had permanent magnet generator been designed by 6 kw, high standards of commercial electric generator housing and more than 130 m2 residence designed by 8 kw, watt-hour meter ac motors are all made of 10 (40) A single-phase watt-hour meter.

Stepper motor and the torque-speed three phase water pump induction motor characteristic in ac servo motor performance comparison

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 
Stepper motor's output torque increases three phase induction motor with speed decreases, and at a high speed when they fell sharply, so its maximum working speed is in commonly 300 acmotor2.blogspot.com ~ 600 RPM. Ac servo motor for constant torque output, that AC motor is, at its rated speed (2000 ac ac synchronous generator motor RPM and 3000 RPM) of less than, can be rated output torque and constant power diesel engine output ac motor above the rated speed for.

2014年11月24日星期一

Single-phase transformer economical efficiency


 ac motor Lamination 220v class B/F 
Specifications
1. Lamination of electric motor 
2. IP54 class F 
3. 100% copper 
4. silicon steel stamping 
5. stunning performance 
First, the same capacity single-phase transformer 20% less than the three-phase transformer with iron, copper fell 10%. Especially when roll core structure is adopted, no-load loss of transformer can be decreased by more than 15%, this will make the single-phase ac electric motor transformer manufacturing cost and use cost down at the same time, to get the best life cycle costs. Information source: http://tede.cn Second, the single-phase power supply system in the power grid, can save wire 33% ~ 63%, according to economic current density calculation, can save wire weight 42%, according to the mechanical strength calculation, can reduce wire consumption 66%. So can reduce the construction investment of the transmission line. This vast area in our country's rural and urban street lighting and aspects of resident power consumption, it is very meaningful. Information source: http://www.tede.cn Single-phase transformer and third, because of its simple structure, is suitable for the modern mass production, to improve product quality and efficiency. 


MS160 Electrical Induction Motor

Specifications
MS160 Electrical Induction Motor 
1.100% Copper Wire 
2.Voltage Tolerance 5% 
3.Aluminum , CE, ISO9001 

4.Factory Promotion IE2 
Fourth, suitable for the electric motor price introduction of new technology, new material, new process, technology points, the party's sixteen session of fifth plenary session put forward the resource conservation as a basic national policy, the eleventh five-year plan "outline" to further reduce the period of "11th five-year plan" period units GDP energy consumption by about 20% as the binding forces. In this big background, the loss of high value-added new products will be way. In theoretical calculation of line loss can be found, 80% of line loss occurred in 20% of the trunk, thus shortening the distance between low voltage main, can greatly reduce the low voltage line loss, due to the single-phase transformer is light in weight, flexible can be installed on the electric pole, facilitate Single phase motor further load center, nearby step-down power supply, improve the quality of power supply. General single-phase transformer power supply in small scope, failure to hit small, to improve power supply reliability. Single-phase transformer at the same time, because of light weight, easy installation and maintenance, the use of flexible, can be used in single phase, also can be used in three sets of three-phase transformer.

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



motor lamination three phase induction wound rotor 

Specifications
1. Lamination of electric motor 
2. IP54 class F 
3. 100% copper 
4. silicon steel stamping 

5.stunning performance 
A 75 kw micro can WIN - G9 inverter commissioning the strange phenomenon Cause: a cement plant users to send a 75 kw can WIN - G9 frequency converter, the cause of the problem is, in the operation of the fire smoke in the inverter, the inverter downtime. Check, the power input circuit of the machine for three phase half controlled bridge, using the principle of controlled rectifier, on the main loop of the dc energy storage capacitor "soft power" and save the small power inverter commonly used rechargeable contactor. In fact half controlled bridge in this here is equivalent to non-contact soft blunt electricity switch. Inspection found that one of the thyristor module electrical motor 12v 1000w terminals have obvious signs of flashover arc burning, but the measurement is not short circuit. Found in the disassembly easily fixed nut landed, flashover reason seems to be a connecting screw loose, causing poor contact. The module for a combination of a diode and a one-way thyristor. And then check the control panel and inverter main circuit, without exception. The module, more than two phase half controlled bridge as the ac electric motor power input, after power on, with a small power 2.2 kW three-phase motor, feel no problem, switch to the new module after a same model, then to the site for installation. 


115/120 V AC Voltage and Three-phase Phase small 240v electric motor
Specifications
1.Specifications1.3-phase asynchronous motors 
2.IEC standard 
3.OEM 
4.Voltage:50HZ &60HZ;380V&415V 

5.Protection class: IP54 
Precaution, first will run to 5 hz frequency, frequency converter load as a fan, motor connector off first, make the motor no-load running. This trial run, got a fright! Frequency at 5 hz, no-load running current 45 a, although feel slightly larger, but consider for a possible repair, or frequency converter for motor winding parameters such as starting curve or torque compensation made adjustment caused by waiting for a reason, without notice. When up to 10 hz inverter panel shows the current and the output current is measured with clip-on table, have reached the 100 a! And the oscillation amplitude of the output current is great, but test the three-phase output voltage, about 70 v, balanced and stable. The motor cable release, electric logging on the inverter output, output frequency 10 hz, the output voltage is 70 v, 20 hz to 150 v, 35 hz to 250 v, after decreasing with frequency, to 50 hz, 400 v. In this process, the measurement of three-phase output voltage balance is very good. The inverter output of V/F curve electricalmotor1.blogspot.com accords with quadratic load torque characteristics. No problem. Output voltage balance and stability, and the output current is too large and the current volatility, obviously for the load caused by abnormal. This is lead to the conclusion of conventional judgment.

The temperature control is accurate

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 
Due to the non-stop to control temperature, avoid the compressor start-stop frequent impact of room temperature, temperature control precision can reach + / - 0.5 ℃, avoid the hot and cold room to people uncomfortable. Refrigeration condition, for example, figure 10 for conventional air conditioning temperature control electric fan motor method of the said T for indoor temperature, Ts to set temperature, press stop set temperature is reached, 1 degree indoor temperature is higher than the set temperature, the compressor has reopened. Figure electric motor price 11 for frequency conversion air conditioning temperature control method, every 0.5 degrees below the room temperature, operation frequency, lower leg, on the contrary, each rise 0.5 degrees at room temperature, higher operation frequency is a, the room temperature is motor electric higher, the greater the operating frequency, so that rapid cooling, the closer it gets to the set temperature at room temperature, the less the operating frequency, provided also refrigerating capacity of the smaller, in order to maintain room temperature near the set temperature, temperature fluctuation is small.

2014年11月23日星期日

Current transformer - use matters needing attention

115/120 V AC Voltage and Three-phase Phase small 240v electric motor
Specifications
1.Specifications1.3-phase asynchronous motors 
2.IEC standard 
3.OEM 
4.Voltage:50HZ &60HZ;380V&415V 

5.Protection class: IP54 
Operation of the current transformer, vice edge is not allowed to open. Because once open, have ac electric motor become primary side current excitation current, the magnetic flux and vice side voltage more than normal and endangers one's personal and equipment safety. Therefore, vice edge is not allowed to answer the fuse in the circuit, current transformer are not allowed in the runtime removed without bypass current meter, relay and other equipment. The connection mode ANP gost motor of current transformer load according to the receive operation requirement. The connection mode of the most commonly used for single-phase, three-phase star and incomplete star. Rated than the rating of the transformer and error change ratio KN refers to the rated voltage of the voltage transformer ratio Three phase motor and rated current of the current transformer ratio. The former is defined as the original winding rated voltage U1N and deputy while winding, the ratio of the rated voltage U2N; The ratio of the latter for rated current I1N to I2N.

The starting current of the machine

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 
1, the circuit breaker to choose 3 times of the rated current is correct! Because the starting current is in an instant. Circuit breaker due to inertia too late response! 2, the Angle of operation and starting current ratio, Angle is 1.73 times of stars! Marked on the Single phase motor motor nameplate! The motor starting current why so big? In the next work, meet a problem: a current rating of 12 a submersible pump, starting current biggest reached 227 a, the wholesalemotor.blogspot.com result will be a upstream switch thermomagnetic tripping protection action. Insulation resistance, no problem, we check the motor is started normally (general starting current in 200 when A normal boot), motor running current of 9.2 A. General starting current is about 4 ~ 7 times the rated current, what reason can make the starting current is so large, whether related to pump lobe jamming? Supplementary question. You refers to the phase insulation of the cable? Haven't test, the motor rated voltage is 380 v, no star 3 phase induction motor triangle the circuit, because running current is normal, so wrong into triangular possibility is not big, besides the two motor starting current is the same, at the same time, the possibility of the same fault is small. In addition, permanent magnet motor also want to ask, two motors at the same time, the starting current will stack?

What is the switch

 115/120 V AC Voltage and Three-phase Phase small 240v electric motor
Specifications
1.Specifications1.3-phase asynchronous motors 
2.IEC standard 
3.OEM 
4.Voltage:50HZ &60HZ;380V&415V 
5.Protection class: IP54 
Exchange "and" switch "originating in telephone communication system (PSTN). We often see in movies or TV before some old movies often see people on the telephone a couple of shakes madly (note not dial), and ac electric motor then said to me by XXX, after the telephone operator received requirements will take corresponding backcourt head in to terminal, can talk to each other. In fact this is the most primitive telephone exchange system, it is just a kind of artificial telephone switching system, is not automatic, and it's not what we want to talk about today, program-controlled switches, but we now speak of SPC exchange, that is, on the telephone exchange technology development. Since the United States bell invented the telephone in 1876, with the increasing of social demand and constantly improve the level of science and technology, telephone switching technology is in rapid change and development. 

DONGFENG Brand Two Speed Motor
Specifications
1. DONGFENG Brand Two Speed Motor 
2. 3000RPM-750RPM 
3. Electrical motor 
4. factory price best quality 

5. 100% copper 
The process can acmotor2.blogspot.com be divided into three stages: artificial exchange, exchange of mechanical and electrical and electronic exchange. As early as 1878 appeared a manual switchboard, it is by the operator to call in, obviously its efficiency is very low. 15 years hind leg into the system switches, it marks the switching electric motor low rpm from manual times into the mechanical and electrical switching times. This switch belongs to the "direct control" mode, that is, the user can through the telephone to dial directly controlled pulse stepper connector for lifting and spins. To complete the user automatically in between. This switch has realized automatic succeeded, but there is a low speed, low efficiency, big noise and mechanical wear serious shortcomings and so on.

2014年11月20日星期四

Current transformer epsilon % error curve calibration step

 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
Calculate according to the protection type (1) an single phase motor electric current flows through the current transformer ratio; (2) according to the model of current transformer, variable ratio and a current ratio, on the 10% error curve to determine the permission of the current transformer secondary load; (3) according to the most severe type of short electric generator circuit current transformer secondary load, the calculation of current transformer actual secondary load; (4) the practical secondary load and allow the secondary load. Such as the actual secondary load is less than the allowed secondary load, said current transformer error less than 10% error: 1) increasing the connection wire section or shorten the connection wire length, Three phase motor to reduce the actual secondary load; 2) choose larger current transformer, reduce a current ratio, increase to allow secondary load; 3) the secondary winding of current transformer in series, a doubling of allowing the secondary load.

Increased safety type motor


 electric motor stator rotor lamination motor parts 
Specifications
1. Lamination of electric motor 
2. IP54 class F 
3. 100% copper 
4. silicon steel stamping 
5.stunning performance 
It is under the condition of normal operation does not produce arc, spark or dangerous high temperature structure of motor, then take some mechanical, electrical and thermal protection measures, to avoid further in the normal or recognized by the overload in the condition of arc, the risk of fire or high temperature, thus ensuring its explosion-proof safety. Its features are: (1) meet the requirements of type increased safety explosion-proof motor, a series of reliable measures to prevent spark, arc and danger of high temperature, can safely AC synchronous generator run in explosive dangerous location. (2) adopts brushless excitation, install ark of rectifying plate rotating and static excitation, excitation control system is reliable; No impact on the suitable polarity slip for excitation, accurate; Step excitation system reliable out-of-step protection, then the whole ability; Circuit design is reasonable, the discharge resistance is not hot at work; Field current adjusting range is wide.

 OEM industrial electric motors
Specifications
1. effiency: IE2 and IE1 
2. 20 years manufacturing experience 
3. 12 months guarantee 
4. low noise and vibtration
(3) synchronous rectifier plate rotating machine, ac exciter and coaxial. Rectifying plate is located in the main motor and exciter, or in the bearing seat. (4) the enclosure protection class is IP54. (5) with F class insulation, temperature rise according to the assessment of class B. (6) changes the traditional under water for cooling, the water cooler in the upper machine. (7) increased safety space heater, fixed on the motor at the bottom of the enclosure, for when stop heating moistureproof. (8) selected high-quality raw materials, electrical and mechanical calculation left a large margin, can satisfy the operation reliability and increase safety type motor temperature requirements. (9) set up a perfect monitoring measures; Main junction box set up for the increased safety of self-balancing current transformer differential protection; wholesalemotor.blogspot.com The stator winding embedding work and standby platinum thermal resistance, index number is Pt100; A leakage monitor, monitor water cooler ac fan motor leak; Both ends of a type slide bearing, respectively, set the scene electric motor temperature display instrument and remote signal terminals.