The working principle of the pump and fan - screw pump

Screw pump is a kind of using screw pitch rotary pump suction and discharge the electric vehicle motor liquid. Screw pump rotor by active screw l (can be a root, also can have two or three) and driven screw ac electric motor 2. Driving screw and driven screw do turn in the opposite direction, thread pitch, fluid from inlet to be screw axis forward pressurization to discharge. This pump is applicable to high acmotortrading.blogspot.com pressure, small flow. Refrigeration system normally used for transport and the speed of oil pump bearing grease.

The choice of control transformer

Motor parts electric motor fan cover 
Specifications
1.Customised 
2. good quality 

3. 20 years manufacturing experience 
When the machine tool www.facebook.com/guohong.trading control electric equipment is more, lines 3 phase induction motor and more complex, had better use the transformer step-down power diesel engine of control, to improve the reliability of generator price the work. generator Control the capacity of transformer, can choose according to the following two conditions: 1, according to the control circuit in the maximum when the workload required power to choose, to ensure that the transformer does not exceed the permitted temperature rise in long-term work. Electrical control system design of transformer the single phase motor required capacity (VA); Control circuit when the maximum load power appliances needed (VA), for ac electrical appliances, 


full load 75% load 50%load three phase induction electric motor Y series B35
Specifications
-One year warranty 
-Within 25 days delivery 

-Life: 5-7 years
Pxc should take the appliance of the holding power. As to the reserve coefficient of the transformer is 1.1 ~ 1.25. Part 2, the capacity of transformer should be able to guarantee has been started single phase induction motor and appliances in other. Appliances, still can reliably to keep off, and to make sure that the electrical appliances will launch at the same time. Also can start off. The Pb press type calculation: type ac synchronous generator of electrical control system design: all start at the same time of the total power of the electromagnet on startup needed (VA); On the type of should according to the startup has sucked squirrel cage induction motor in electronics to calculate. Transformer capacity required, shall be calculated by the above two type of the capacity of the decision.

Wire tube (tube, PVC tube) installation does not conform to the requirements

 Motor parts electric motor fan cover 

Specifications
1.Customised 
2. good quality 
3. 20 years manufacturing experience 
1, the phenomenon of (1), cable pipe multi-layer overlap, there are higher than that of the temple square steel bar gluten. (2), wire and tube side by side for more than 2 or 2 root clingy. (3), electrical, pipe buried depth of the wall is too shallow, and even buried outside the walls of the powder layer. Pipe die bending, folding, dent phenomenon. (4), wire and tube into the distribution box, pipe in mouth not to fill, in the show is too long; Nozzle is not level off, different length; Nozzle without skirts; Not locked. (5), embedded PVC wire pipe not with stopper head plug, but with the clamps bend mouth flat. 2, (1) analysis of the causes, generator construction personnel to the related specifications are not familiar with, careless attitude toward work and convenience, not according to the provisions. Construction administrator management does not reach the designated position. (2), architectural design layout and electrical professional cooperation is not enough, cause more narrow line pipe 3 phase induction motor through the same plane. 3, preventive measures (1), and to strengthen the quality control of construction process of site construction personnel, targeted training of workers; Management personnel must be familiar auto spare parts with related specifications, strict management. 


three phase induction electric motor Y series B35 1.5KW 2.2KW 37KW 75KW

Specifications
-One year warranty 
-Within 25 days delivery 

-Life: 5-7 years 
(2), squirrel cage induction motor three phase induction motor small diesel engine wire and tube multi-layer overlap generally appeared in the high-rise building public channel. When tower house each layer has six sets of the above, the proposal had better use the public corridor of smallpox condole top civil ACTS the role of alternator generator way, so most of the electrical professional into the door line can be directly above the ceiling installation slot to houses. Also can adopt the way of increasing public aisle floor, to hidden many wire and tube. When electrical construction professionals cloth tube should reduce overlapping layers of line pipe at the same point. (3), wire layer cannot clingy, side by side, such as the construction of it is difficult to clearly separate, can be used to separate the small concrete. (4), wire inside the tube into a brick wall, the distance from the surface should not be a boy of 15 mm, to "horizontal flat vertical pipe laying. (5), wire and acmotortrading.blogspot.com tube bending radius (dark bury) should not be less water pump price than 10 times the pipe diameter, pipe bend to bend with pipe bender or kink holding level off is smooth, does not appear the phenomenon such as flat folding, dent. (6), wire and tube into the distribution box should level off, the length is 3 to 5 mm, tube with a sheath and lock box shell. Distribution box into the floor type wire tube, pipe distribution box should be higher than that of base surface is 50-80 - mm. (7), embedded PVC wire tube, it is prohibited to the nozzle with forceps clip flat, curved, fist application conforms to the pipe diameter PVC pipe stopper head to block, and adhesive binding firmly.

Two phase stepper motor wiring method and the current setting question 2

So you have A stepper motor drives the output current can not be adjusted of the permanent (refers to two phase full bridge output drive, such as net friend common TA8435, TB6560 and A3977 driver chip), lamination machine how to select the stepper motor is very important, if your drive is 2 A, try choosing of two phase four wire 2 A motor (such as second-hand Japanese Oriental motor are mostly the) if you choose, the six wire motor will have to choose A nominal current as 2/0.7 = 2.9 A (about) of motor. In order to better play to the role of the drive. But if you choose the output driver is half bridge (such as SLA7062M, SLA7026 drive chip), it can single phase motor only pick up, the water pump price six wire motor drive current and motor nominal current is the same. But the permanent magnet generator drive at present very few, the efficiency is low. 

Lines to for six or eight spare parts stepping motor phase winding adopts parallel operation, can play a maximum wholesalemotor.blogspot.com output torque and diesel generator set show a good dynamic performance, six line motor is unable to connect in parallel form, actually already single phase motor in internal together, the public end of the series is the center tap. Only eight line phase coil of the motor can be used in parallel. If we can open the machine back cover, take a look at the inside connection structure, can change, make six line motor into eight line, so it can be used in parallel, but electric generator not all of the six lines of motor can be changed, only can see the attachment in the form of joint from behind the motor changes, and some motor is solder joint, the restructuring skills will be needed. I have been restructured for stepper motor, the series can also be used generator in parallel, the parallel when using phase current is 1.4 times that of the original high speed performance is greatly improved, torque is increased, too.

Wire and cable load output voltage is normal, after the loading of overload or over-current electric motors

small motor spares suppliers of motor parts 

Specifications
1.20 years fan&motor manufactruer 
2.We can open mould&punch&diecast&finish&winding 

3.competitive price,high quality 
 This kind of situation is usually due to improper parameter Settings or drive circuit aging, module damage caused. Take time to add cooling fluid method fridge?? Refrigerator take time AC motor to add liquid cooling method ac synchronous generator For refrigeration equipment repair, time is the second 3 phase induction motor 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 www.dongfeng-motor.com the vacuum pump. Time is longer than with the vacuum pump is a few longer, because of the relative likelihood () compressor exhaust two (amount) to some smaller than vacuum pump. On the fridge process pipe connected to a job with magnetic generator a pressure gauge valve, one ac synchronous generator 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 diesel engine external compressor, start time, when there ac motor is no gas discharge vent on the vacuum pump, take time to complete.

Motor wiring

 Cast iron ac induction electric fan motor parts 
Specifications
1. 20 years manufacturing experience 
2. competitive price,high quality 
3. Type: iron body of AC electric motor
Motor wiring mantra: www.dongfeng-motor.com "1.5 plus two, plus three" 1.5 "after the four plus four, six plus six," "increasing after 25 plus five, after 50 minus five" 102 conductor, the best number "the mantra diesel engine is equipped with wire directly based on the three-phase 380 v ac motor capacity." 1.5 plus two "said 1.5 was copper, plastic wire, can go with 3.5 kW and the following motor. Because of the 4 kW motor selection of close to 3.5 kW use scope, and the formula has certain allowance, so the quick table 4 kW motor under the selected conductor take 1.5 was." After 2.5 plus three ", auto spare parts "four plus four", said was 3 phase induction motor 2.5 and 4 was the copper plastic wire to auto spare parts respectively 5.5 kW, 8 kW motor." After six plus six, "said from the beginning of the 6 was, with the" increase 6 kW motor. "that squirrel cage induction motor was can match 12 kW, choose similar specification with 11 kW motor. 


AC motor aluminum 2800 rpm motor fan cover 

Specifications
1. Customised 
2. good quality 
3. Surface treatment: Galvanize 

4. AC motor 
10 was 16 kW, choose similar specification with 15 kW motor. 16 was 22 kW acmotor2.blogspot.com motor can match. The middle and 18.5 kW motor, also copper plastic line 16 was chosen." After 25 plus five ", it is said from 25 was addend from six to five. 25 was 30 kw electric motor can match. 35 was 40 kw can match, choose similar diesel generator set specification with 37 kw motor." Increasing after 50 minus five ", it is said that since 50 was made up into a reduced, and it is increasing step by step to lose five. 50 was 45 kw motor can be produced (50-5). 70 was can match up to 60 kw (70-10), select similar specification is equipped with 55 kw electric motor. 95 was can match 80 kw (95-15), choose similar specification with 75 kw motor." 102 conductor, with the number ", magnetic generator it is said that 120 was the copper plastic wire can match 100 kw motor, phase selection specifications namely 90 kw electric motor.

Current transformer selection and calibration accuracy

Accuracy refers to within the scope of the provisions of the secondary load, a current of the maximum error when rating. China's current transformer accuracy and error limits as shown in table 1, for different measuring instrument, should choose different accuracy of current transformer. The choosing principle of accuracy: billing measurement with the current transformer is the accuracy of 0.2 ~ 0.5; Used to monitor the size of the load current in outlet and inlet line of each loop current meter should choose 1.0 3.0 level current transformer. In order to guarantee the accuracy of error is less than specified value, generally also check current transformer secondary load (ei), transformer secondary load S2n S2 is not greater than the rated load, the selected accuracy can be guaranteed. The accuracy of calibration formula: S2 S2n or less. Secondary loop load l: www.dongfeng-motor.com depends on the value of the secondary loop impedance Z2 is: S2 electric motor 12v 500w = I2n2 ︱ Z2 ︱ material I2n2 (∑ ︱ Zi ︱ + + RXC RWl) or S2V1 material ∑ Si + I2n2 (RWl + RXC), Si, Zi as the secondary circuits of the instrument, the rated load and impedance of the relay coil RXC for all joints in the secondary loop, contact contact resistance, generally take 0.1 Ω, RWl for the secondary loop wire resistance, calculation formula is: the RWl = LC/(r (S). Type, r for the conductivity of the wire, copper wire 53 m/r = (Ω was), aluminium wire r = 32 m (Ω was), S for cross-sectional area (was), LC for the calculation of the wire length (m). A multitude of transformer to instrument one-way length of L1, is: L1 transformer is star. LC = L1 two-phase V wiring. 2 a phase l1 type connection. The accuracy of current transformer used for the relay protection has 5 p and l0P. Protection level of accuracy is based on accurate rating limit down an electric epsilon % of the maximum error of the composite to nominal (such as 5 p corresponding epsilon % = 5%). So-called rated accurate limit a rated current is a current Induction motor is a current multiples (n = I1 small three phase motor / I1n), also known as rated limit coefficient accurately. Is asked to protect by current transformer in the range of possible, its biggest composite error is less than epsilon % value.