Building electric installation engineering common fault and cause analysis

 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
Building electric installation engineering common fault and the reason analysis, grounding is not in conformity with the requirements 1, phenomena (l), downlead, equalizing ring, lightning protection belt up it with slag, flash, virtual welding, bite meat, weld flaws in full. (2), welding slag is not broken, lightning Induction motor protection belt do not brush anti-rust paint welds. (3), lap steel rebar instead of round steel. (4), direct use of butt electric water pump welding of main reinforcement for lightning protection pilot a useful. 2, root cause analysis (1), the operator is not strong sense of responsibility, not good at welding technology, most of them are versatile electrician class welders, opposite welding operation skill is poor. (2), the site construction manager for national construction three phase induction single phase motor motor and acceptance specification GB50169 2 not enough relevant provisions of the grounding device. 


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
3, preventive measures acmotor2.blogspot.com (l), and to strengthen the skills training of welders, lap it to the full in welding, smooth and uniform, especially the opposite welding and single phase induction motor high overhead welding difficulty, such as welding training. (2), strengthen management and welder's sense of responsibility, timely repair welding is unqualified weld, and broken 3 phase induction motor slag in time, brush anti-rust paint. (3), according to the GB50169 2 "electrical equipment installation engineering and acceptance specification for construction of grounding device, lightning protection downlead of connection for lap welding, lap length is 6 times the diameter of the round steel, therefore, are not allowed to lap steel rebar instead of round steel. In addition, as magnetic generator main squirrel cage induction motor reinforcement construction of downlead touch so butt welding, should fill by the regulation in touch welding place a lap round steel.

The squirrel-cage asynchronous motor startup (a) direct start

ac electric motor stator copper winding 

Specifications
1. Material: silicon steel  
2. 20 years manufacturing experience 

3. competitive price,high quality 
The startup and voltage on the www.facebook.com/guohong.trading stator winding of the motor rated voltage. Three-phase asynchronous motor direct start (a) meet the conditions of 1, capacity under the 7.5 KW motor can be used. 2, motor at starting moment caused by the power grid voltage drop is not more than 10% generator price diesel generator of the power supply voltage is normal, for not often start the motor can be up to AC motor 15%. 3, available empirical formula rough estimates whether the motor can be directly started. Advantages: the boot device is simple, the startup time is short, starting operation simple, reliable, the cost is low. Disadvantages: the motor and power grid has a certain impact (2) the step-down start. The voltage on the stator winding of the motor is started to reduce, start at the end of the rated voltage of the startup mode. Step-down starting may help reduce motor starting current, but due to the torque is directly proportional to the square of the voltage, so the step-down startup motor torque decreased is more, reason is only applicable to start no load three phase diesel generator set induction motor or light load. 


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 
N autotransformer (also called compensator) step-down start n star - triangle (Y - Δ) step-down start n extended delta start n (or reactance) step-down starting resistance. 1, autotransformer (also called compensator) step-down start wiring: (1) high pressure side of the diesel generator set autotransformer into power grid, the low voltage side connected to the motor, there single phase induction motor are several different voltage than tap to choose from. (2) features: set autotransformer change ratio of K, the original side voltage of U1, U2 = vice side voltage U1 / K, vice edge current I2 (that is, through the line current of the motor stator winding) also according to the proportion is reduced, and because of I1 = I2 / K, ac synchronous generator the power supply of the motor starting current is directly 1 / K2 times when it is started. 1 / K times due to lower voltage, torque reduced to 1 / K2 times. Autotransformer vice edge from two to three groups of tap, such as secondary voltage of primary side voltage respectively 80%, 60%, 40%. Advantages: can be according to allow the starting current and starting torque required for different tap to choose autotransformer achieve step-down start, use Y or Δ stator windings. Weakness: the equipment is big, the investment is more expensive.

Inverter maintenance detection commonly used method, the dynamic test

ac electric motor stator copper winding 
Specifications
1. Material: silicon steel  
2. 20 years manufacturing experience 

3. competitive price,high quality
Dynamic test: after 3 phase induction motor the normal static test result, can dynamically test, namely the electrical commissioning. Before and after the electricity must pay attention to the following: 1, the electricity before, must confirm whether the input voltage generator is wrong, the 380 v power access to 220 v level of frequency converter will be Fried machine (Fried capacitors, varistors, module, etc.). 2, check the inverter after sowing mouth has been properly connected, whether there is loose connection, connection exception can sometimes water pump price lead to frequency converter failure, serious when a frying machine, and so on and so forth. 

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 
3, detect fault display content, such as transistors and preliminarily concluded that the failure and the reason. single phase induction motor 4, such as fault, not ac induction motor shown first to check whether there is abnormal parameters, and the parameter after resetting, the no-load without (motor) magnetic generator start frequency converter, and test the water pump price U, V, W three-phase output voltage value. Such as a lack of phase, three-phase imbalance, and so on and so forth, is a fault module or driver board, etc. 5, the output voltage is normal (shape phase, magnetic acmotor2.blogspot.com generator three-phase equilibrium), under the condition of load test. Test, it's best to full load test.

The selection generator price of thermal relay

 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
Thermal relay used in motor overload protection. The choice of thermal relay is based largely on. The rated current of the motor to determine the type and specification. Rated current of the thermal relay element. IRT should be close to or slightly greater than the rated current of the motor Ied, namely: the electrical control system design. In general, can choose two phase structure of thermal relay, the serious imbalance in the power grid voltage, motor under the condition of poor working conditions, can choose three phase structure of the thermal relay, for motor delta connection, in order to achieve the phase failure protection and are optional with open phase protection of thermal relay. 


ac three phase asynchronous electric motor stator 

Specifications
1. 20 years manufacturing experience 

2. competitive price,high quality
If the following electric motor parts circumstances, the choice of thermal relay setting current than the motor rated current of components, www.dongfeng-motor.com in order to protect: (1) the inertia torque motor load is single phase motor very large, rotor the starting time is long; (2) motor driven equipment, do not allow any power failure; (3) motor drive for the impact loads, such as punching machine, shearing machine equipment. The commonly used thermal relay JRl, JR2, permanent magnet generator lamination machine JR0, JRl6 etc. JRl6B series double metal plate thermal relay and www.dongfeng-motor.com its current setting range is wide, and a temperature compensating device, suitable for long-term job or intermittent ac motor overload protection, and phase failure protection device operation. generator JRl6B diesel generator set is modified by JR0. This series of products used in place of JR0 three pole and thermal relay with phase failure protection.

A two-speed motor variable speed principle

 AC fan cooling motor fan cover 
Specifications
1. Customised 
2. good quality 
3. Surface treatment: Galvanize 
4. Type: Motor Cover 
Variable speed of the motor by changing winding single phase motor connection mode, that is to say, with a rotating magnetic field of magnetic pole change motor logarithmic to change its speed. If your unit's Electric motor two-speed motor (fan), low speed at ordinary times, sometimes fan on high speed turning, mainly through external control circuit switch to change the motor coil winding connection. 1, there are two fan motor different embedded in the stator slot logarithm of winding, by changing the external control line to change of motor stator winding connection to realize the logarithm change poles; 2, in the stator slot embedded, there are two different polar logarithmic independent winding; 3, in the stator slot is embedded, there are two different logarithmic independent winding, and each winding can have different connection again.

Stepper motor main circuit

 Y series best cast iron three phase induction motor
Specifications
1. 20 years manufacturing experience
2. 12 months guarantee
3. low noise and temperature rise
4. high starting torque

Stepper motor main circuit mainly includes the drive circuits and logic control circuit of two parts. Driving circuit power single phase motor price using 28 V, voltage Fan Si 4.5 ~ 40 V, improve the driving voltage can increase the output of the torque motor in the high frequency range, the voltage selection according to usage. VMB, VMA for step motor drive power supply pins, should access ceramics decoupling capacitors and electrolytic capacitor voltage regulator. OUT_AP, OUT_AM, OUT_BP, OUT_BM pin motor phase 2 output interface, respectively, due to the internal integration the fly-wheel diode, the four outlets without external like Toshiba 8435 driver chip diodes, thus greatly reduce the circuit board wiring space. The NFA, NFB is respectively A and B phase motor drive current largest define pins, maximum current calculation formula for the IOUT = 0.5 (A) (V)/RNF (Ω), if the predefined motor each phase of the maximum driving current of 2.5 A, take RNF = 0.2 Ω, PGNDA, PGNDB, SGND is www.dongfeng-motor.com respectively A and B phase motor drive and logic power supply pins. Power supply for 5 V logic control circuit, VDD power supply pins for logic, should be connected to the decoupling capacitor and bypass capacitor reduces interference noise.

Stator Motors Rotor
Specifications
1. 20 years manufacturing experience

2. competitive price,high quality

M0, PROTECT the working status and over-current protection light; RESET to RESET chip, low level effectively; Capacitance of the OSC receive size determines the frequency of chopper, recommendation 100 ~ 1 000 pF, chopping frequency is 400 ~ 44 kHz; M2 and M1 set pins for segmentation, external dial the code switch can be set different subdivisions, such as the step, half step, 1/8, 1/16 segment segmentation. Because of the step motor at low frequency, vibration is big, the noise big shortcoming, need to solve the segment. Stepping motor subdivision control, in essence ac motor is through the control of the stepping motor in the exciting winding current, make the stepping motor for the synthesis of internal magnetic field uniform circular rotating magnetic field, so as to realize the segmentation of stepper motor step Angle. Under normal circumstances, the synthesis of magnetic field vector amplitude decide the size of the step motor rotation torque, the Angle between the adjacent two synthesis of magnetic field vector size step determines the size of the pitch Angle. DCY2, DCY1 external dial the code switch setting current attenuation mode lamination (0, 25%, 50%, 25%), used to meet the needs of the different step motor. Due to the motor itself, power supply conditions and other factors such as pulse frequency, the influence of step motor may produce high-frequency noise, attenuation model through the current Settings can reduce or even eliminate the noise. Figure 3 shows the attenuation model of 0 and 50% when the change of the coil current, but waveforms has obvious improvement.

From abnormal vibration of asynchronous motor and how to determine the cause of the problem in his voice?

AC induction cooling fan motor
Specifications
1.Customised
2. good quality

3. 20 years manufacturing experience

Asynchronous motor produce abnormal vibration and abnormal sound mainly has two aspects of mechanical and electromagnetic. Mechanical reasons: (1), motor blades damage or tighten screw loose blades, blades and the blades into cover, clattering sound produced by it with the weight of the sound, the big small; (2), due to the improper bearing wear or shaft, motor rotor eccentricity caused serious when will make, rotor rub, make the motor produces severe vibration and electric fan motor uneven scratches. (3), motor due to long-term use of the anchor bolt is loose or not foundation, thus the electromagnetic torque of the motor under the action of abnormal vibration; (4), long-term use of the electric motor 12v 500w motor due to a lack of lubricating oil in the bearing inner formed in mill run or bearing steel ball is damaged, therefore make the hiss of the motor bearing interior an exception or purr. Electromagnetic reasons: (1), the normal operation of the motor suddenly appear abnormal sound, in the load running speed decreases significantly, while a low along the roar, may be unbalanced three phase current, the heavy load or single phase operation; (2), the normal operation of the motor, if the stator and rotor winding short-circuit fault ac induction motor 110kw or squirrel cage rotor broken bar when electric are high when low buzz. 

Y series totally enclosed protect Asynchronous motor
Specifications
1. 20 years manufacturing experience
2. 12 months guarantee
3. low noise and temperature rise

4. high starting torque

The fuselage vibration. (1), due to long-term lack of oil running of motor bearing, friction losses increase bearing overheating. In addition, when the motor running, the oil too much or too thick will also cause bearing overheating; (2), when the replacement of lubrication, due to the lubricating oil mixed with hard grain impurity or bearing cleaning uneven net, make bearing wear and overheating, even may damage the bearing; (3), due to improper assembly, fixed end cover wholesalemotor.blogspot.com screw tightness is differ, in a straight line between the two bearing center is unbalanced or bearing outer ring. The bearing rotation is not flexible, adds load after growing friction and heat; (4), belt too tight or motor and were not in a straight line with mechanical shaft center, and thus can increase the bearing load and heat; (5), bearing improper selection or poor quality, such as bearing internal and external ring rust, individual steel ball is not round, etc.; 6, in the operation of the motor bearing damaged, resulting in bearing overheating.

Working current

Working electric motors price current is computer radiation eliminator in normal work can provide the maximum current,the unit is the ampere,this is one of the most important parameters of computer radiation asynchronous motor eliminator.Computer radiation eliminator is working to replace the computer power cord,so the working current must be greater than the required working current computer,usually over 5 amperes.To be sure in the normal work of continuous electricalmotor1.blogspot.com working current,the product is can provide the maximum current,and not to say that the work must have need of such a current.In fact,the computer radiation eliminator at work using the current far less than this electrical motor 24v value,basically depends on the current computer itself need,the computer radiation eliminator consumes power is very small.