PID principle - step response

Step response is a step input (step function) added to Water pump the system, the fan motor output of the system. Steady-state error refers to the AC motor response of the system after entering the steady stator state, the difference between generator set the desired output ac induction motor and the generator actual output of the system. The performance of the control system can be used to steady, accurate, quick three words to describe. Stability refers to the stability www.facebook.com/dongfeng.motor of the system (stability), a system to work normally, first of all generator ac synchronous generator must be stable, look from the step response should be permanent magnet motors for small diesel engine sale convergence; quasi refers to the accuracy of the control system, control accuracy, usually use the Steady state error to (Steady - state error), which represents the system output steady-state value and the difference between the expected value; quick response refers to the control system of quickness, usually use rise time to quantitative description.

Wire and cable, electrical should know some common sense

 induction motor rotor electronic parts 
Specifications
1.20 years manufacturing experience
2.competitive price,high quality
3.Delivery Detail:within 10 days after receiving deposit
Three-phase five wire with color yellow, green, red, 3 phase induction motor light blue, respectively the U, V, W, N protective earthing line double color (PE) transformer in operation, diesel generator each transformer phase current should not exceed rated current; The maximum unbalance current shall not exceed 25% of the rated current. Transformer generator operation should be performed periodically maintenance. The same transformer power electric water pump supply system, unsuitable mixed protective earthing and protection by zero. The voltage transformer secondary coil normally rated voltage 100 v. Secondary side of voltage transformer at work may not be short circuit. Due to short circuit will produce a lot of short acmotor2.blogspot.com circuit current, may burn out transformer, voltage transformer for this time, secondary side are installed fuse protection. 


Totally Enclosed Protect Feature and Three-phase Phase low rpm ac electric motor

Specifications
1.IEC standard 
2.OEM 
3.Voltage:50HZ &60HZ;380V&415V 
4.Protection class: IP54 

5.Packaging Details:80-112 carton box 132 and above ply wooden box
Secondary side of voltage transformer must be grounded at one end. This is to prevent the secondary coil insulation breakdown, a high pressure into the secondary side, endanger the safety of person and diesel generator set equipment. Current transformer secondary side close to the short circuit conditions at work. Rated current of the secondary coil is commonly 5 a current transformer secondary side is not allowed to open at work, current transformer secondary side must be grounded at one end, to prevent the first and second coil insulation breakdown, the side of a high voltage into the secondary side. Current transformer in diesel engine the join, want alternator generator to note magnetic generator the polarity of the first and second coil, transformer using subtractive polarity marking method in our country.

The choice of motor with contactor

3 Phase induction Electrical Motor MS Series for winding machine

Specifications
ambient temperature:-15 -40 
above sea level : not exceed 1000m 

rated voltage:+-5% 
Contactor shall be chosen principle: (1) by using the categories to choose: in the actual production, the water pump vast majority of cage motor use, diesel engine basic belongs to the category is chosen according to AC - 3 use. (2) to determine the level of capacity: the capacity of the contactor or main contactor under rated voltage 3 phase induction generator motor and other technical conditions, the determination of the rated current, attention should be paid to the following points: 1) the influence of duty and working frequency: when choosing contactor, attention should be paid to the control object is a long-term work week, or repeat short work. In the operating frequency is high, but also increase squirrel cage small diesel engine induction motor the contactor of the rated current capacity must be considered. Should as www.dongfeng-motor.com far as possible choose silver, silver or silver contact contactor, such as the KSDZ - U series products. 2) the influence of environmental conditions: production process environment is bad, dust pollution is serious, poor ventilation, and higher temperature in the workplace. To the choice of contactor should be taken down, let the use of technical measures. ac synchronous generator Contactor for rated current of the quick: watch a Y180L - 4, 2 kW motor, for example, from a quick table should check with U60 type contactor. The motor rated current 60 a, rated current 60 a contactor, according to the general AC alternator generator - 3 work category, the contactor to control power of 30 kw 380 v motor, control 380 v 22 kw motor, now belongs to let use reduction.

The motor rated current simplified

CCC CE ROHS UL VDE Certification and 115/120 V AC Voltage 220V&120V induction motor

Specifications
1. Specifications1.3-phase asynchronous motors 
2. IEC standard 
3. OEM 
4. Voltage:50HZ &60HZ;380V&415V 

5.Protection class: IP54 
Simplified Water pump formula: (1) the motor rated current (A) : "double motor power", namely "A kw two amps. Usually refers to the commonly used 380 at www.facebook.com/guohong.trading about 3 phase induction motor 0.8 v, ac synchronous generator the power factor of three-phase asynchronous motor, "kw auto spare parts number plus one times the rated current of the squirrel cage induction motor motor. (2) empirical formula: the motor rated three phase induction motor current (A) = motor capacity (kW) x 2). The simplified formula and 3 phase induction motor empirical formula is the use of the result is consistent, calculate the rated current and motor nameplate was very close to the actual current values, conforms to the practical requirements, such as a Y132S1-2, magnetic generator 10 kW motor, using the simplified formula or empirical formulas calculate its rated current: 10 x 2 = 20 a.

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?

Separated out 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 adopts flame-proof case may produce a spark, arc and dangerous temperature of the electrical part is separated from the explosive gas mixtures around. However, the enclosure is not sealed, the explosive gas mixture by shell around the internal part of the joint clearance into the motor. When with spark, arc and dangerous high temperature within the enclosure contact with an ignition source might explode, at this moment the flame-proof shell the motor will not damage or deformation, flame and explosion or hot gas came permanent magnet motors for sale through joint clearance, also cannot ignite surrounding explosive gas mixture. Its main features are: (1) power level, installation size and speed of corresponding relation and DIN42673 consistent, at the electric motor price same time considering the inheritance and YB series and the interchangeability of Y2 series, make the necessary adjustments, more effective and applicable. (2) the whole series with F class insulation, temperature rise according to the assessment of class B. (3) the noise limit is lower than YB series, close to YB series of grade I noise, vibration limit and YB series. (4) motor electric improve the IP55 protection grade. (5) the whole series of choose low noise deep groove ball bearings, stand center high note oil discharge device is installed at more than 180 mm motor. (6) motor heat sink has two parallel horizontal distribution and the radiation distribution, give priority to with parallel horizontal distribution. (7) the main performance index reached the international advanced level in the early 1990 s.

What are the components of transformer overhaul?

(1),hanging out of the body,overhaul,body (core,coil,generator generator set tap- changer and lead);(2),maintenance safety cover,oil storage tank,gas,heat pipe throttle single phase generator and casing;(3),and cooling device and oil filter equipment,(4),filter oil or oil changes,if necessary,dry processing.(5),the access control and measuring instrument,signal and protection device;6,clean up the shell,if necessary,paint;All landowners,assembly and measurement and test.

(1),hanging out of the body,overhaul,body (core,coil,tap-changer and lead);12v mini generator motor (2),maintenance safety cover,oil storage tank,gas,heat pipe throttle and casing;(3),and cooling device and oil filter equipment,(4),filter oil or oil changes,if necessary,dry processing.(5),the access control and measuring instrument,signal and protection device;6,clean up the shell,if necessary,paint;All landowners,assembly and measurement and test. Advantages of wound asynchronous motor can be through the collector ring wholesalemotor.blogspot.com and brush,plus resistor in series with the rotor loop,to improve the starting performance and can adjust speed change and resistance within a certain range.But the wound,more complicated than the squirrel- cage asynchronous motor structure,poor reliability of the movement of the price is more expensive.

Voltage current transformer model meaning

Capacitive voltage transformer (CVT),in 1970 developed the domestic first 330 KVCVT,1980 and 1985,developed fan motor the first generation and second acmotortrading.blogspot.com generation KVCVT 500,1990 and 1995,developed the third and fourth generation KVCVT 500,more than 30 years has accumulated rich 12 volt electric motor experience in scientific research,development,design and production,in the domestic developed generation after generation of CVT new products,three phase induction motor giving impetus to the development of the domestic CVT.CVT's main features are: 1.High electric strength,insulation margin is large,reliable operation.2.Reliable damping ferroresonance.Successful adoption of the new group phase,with strict quality control,ensure that the factory's every piece of CVT are under any of the voltage from low to high effective damping various ferromagnetic resonance frequency.3.Good contact response characteristics.When the second time remaining after a short circuit voltage can fall below 5% in 20 ms,especially adapted to the fast relay protection.4.Has the power grid harmonic monitoring of patent technology.

Pole changing logarithmic speed control method

This control method is used to change the connection mode of the stator acmotortrading.blogspot.com winding to change cage motor stator polar logarithmic to achieve speed,features below:With a hard mechanical properties,good stability;No slip loss,high efficiency;Wiring is simple,convenient control,low permanent magnet generators for sale price;Have used differential is bigger,cannot obtain smooth speed regulation;Can be used with regulating speed control,electromagnetic slip clutch,5kw permanent magnet generator smooth speed electric motors pricec haracteristics of high efficiency.This method is suitable for don't need a stepless speed regulation of production machinery,such as metal cutting machine tools,elevators,lifting equipment,fan,water pump,etc.

220V YC single-phase asynchronous electric motors double running capacitors IP44 IP55 IP56 1.2.3.4.5hp high torque

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Y2 three phase cast iron housing electric motor

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