How much is the no-load current of asynchronous motor?

motor Lamination ac motor blender parts 

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

5.stunning performance 
Formula is the scene quickly calculate motor no-load current of specific numerical formula, it is a lot of the test data. It is in line AC synchronous generator with "the no-load current of the motor is the 1/3 of its rated current". At the same time it is in line rotor and stator with practice experience: "the no-load current of the motor, shall not exceed the capacity of the kw number can be used for" the principle of (after repair of old, small capacity motor). Formula "capacity by about eighty percent for" refers to the general motor no-load current value is about 0.8 times the number of nominal capacity kw motor. No-load current of medium-sized, 4 or 6 pole motor, is the number of motor capacity kw 0.8 times; New series, large capacity, small number of level 2 of the motor, the no-load current calculation according to the number of 3 phase induction motor "xinda sixty percent less"; To the old, old series, smaller volume, the number of large more than 8 pole motor, the no-load current, calculated on "is a small number of very many kilowatts", namely the no-load current value kw number approximately equal capacity, but is generally less than kilowatts.

PLC control two pump start-up failure solutions to problems

Situation:in the double liang steam double-effect lithium bromide absorption air-conditioning unit,the use of omron PLC (PA204S C200HE-CPU42,power supply) to control the start of two pumps. When,in turn,start the two pumps,often led to the suspension of the power of the PLC,thus stop running program.Second,the detection of 1,use the meter to measure the voltage electric motor 12v 500w waveform of two pump ordinal startup PLC power PA204S ac voltage of the power supply change found:when did not start the electrical motor 12v 1000w pump,the voltage of the power supply is normal,when start the two pumps,instantaneous fell to the power supply voltage of 184 v,184 v and the duration of the above 25 ms,PLC to stop working,and to determine the effect of pump power of PLC.2,in order to solve this problem,respectively for the following tests: A) driving the pump first,delay around 10 s to start small pump,power supply voltage drop to about 190 v,the instructions first,pump makes instantaneous voltage drops,later start small pump,affect smaller,but it need to modify the PLC program.


B) because the pump power supply is turned by high tension line through a transformer,transformer capacity,can be considered a large capacity of transformer,may make the pump will be smaller influence on the PLC power supply voltage.C) in the PLC power supply termination a large capacitance,but the effect is not obvious.D) finally in one power supply transformer converted by a 220 v power supply to PLC,found that even in the start two pumps at the same time,PLC power supply voltage drop is only about 204 v,204 v,the can.Conclusion:as a result acmotortrading.blogspot.com of the PLC power supply is supplied with water pump in the same way,and the plant's transformer capacity is small,so in the start two pumps,caused the PLC power supply voltage drops below 85% of rated voltage,and duration of more than 10 ms,resulting in PLC detected power interruption,stop working. So the advice from the transformer converted one by one in the 220 v power to separate for PLC,which can solve the problem.

Domestic development

Relevant statistics show that gm products production growth,other special series motors are derived products also have larger growth,for example,vibration motor,vibrating screen, Frequency rotor conversion motor,elevator,diving submersible motor,injection molding machine motor,permanent magnet synchronous motor,ac servo motor,etc.New product development and achieved good results.Development during the period of "tenth five-year" to the cold heat generation "Y3 series three-phase asynchronous motor,in April 2002,has passed the expert appraisal,is the national promotion.In addition,on the main derived series Using cold rolled silicon steel sheet updated products development work is in progress,such as high efficiency motor series,low noise,low vibration motor,low voltage high power motor, IP23 low-voltage motor series,etc.As the motor manufacturing industry competition are growing,large motor manufacturing www.dongfeng-motor.com enterprise mergers and acquisitions between integration and capital operation,excellent motor manufacturing enterprises at home and abroad Industry is becoming more and more emphasis on industry market research,especially on the enterprise development environment and the further research of customer demand trends.Because of this,a large number of domestic and foreign outstanding Motor brand rise rapidly,becoming the best motor manufacturing industry.Industry experts point out that,during the "tenth five-year plan,due to the rapid development of national economy,small and medium-sized motor production originally puts forward the goal of" tenth five-year plan "a greater distance Growth plan.Happy is more than that.

Accelerate industry consolidation,consolidation of the small and medium-sized motor have begun.At present,our country electric nearly 2000 large and small,to do Tube enterprises large number,but it is quite a number of small businesses.Experts point out that,because of the large manufacturers,production form the mutual competition seize market demand situation.The product quality Uneven,interacting each other,low-margin industry competition,has become affect motor is the main reason for the enterprise survival and development.Motor itself is labor-intensive products,reach a certain scale of production is very difficult to make profit,so the electric vehicle motor industry profit is very low,about 300000 workers in the motor industry People,industry profit is only 280 million yuan in 2003.According to understand,even in some benefit better business,net profit last year amounted to less than 5%.At the same time,due to the most Small businesses don't pass production technology,motor industry also has a lot of the quality of the product is unqualified phenomenon.Motor enterprise in our country,according to the survey of the waste,defective products,as well as the return product loss Loss of around 10% on average,and motor industry developed countries abroad enterprise is unqualified for the average 0.3%.In recent years,our country's motor industry is a group of production scale,product level,good quality,advanced technology and equipment of the enterprise.However,no one Products can be accounted for in the domestic market share dominance.Small and medium-sized motor has yet to form a brand with international influence.Motor industry needs to integrate,superior Tide,it has become the trend of the development of motor industry.The expert points out,although it is an old traditional industrial motor industry,but all walks of life form a complete set of motor are indispensable.Moreover, Some of the larger motor enterprise covers an area of big,a lot of well,after the acquisition,will bring the acquirer very generous benefits and financial resources.

Motor protection Motor protection

Motor protection is www.dongfeng-motor.com to give comprehensive protection,that

is,in the motor overload,open phase,locked-rotor,short circuit,overvoltage,undervoltage,electric

leakage,three-phase imbalance,overheating,Bearing wear using the rotor eccentricity and axial

channeling,radial runout,shall report to the police or protection;For motor protection device is a

motor protector,including thermal relay generator stator core Apparatus,electronic

protector and intelligent protector is present large and important motor generally adopts the

intelligent protection device.The differential protection www.dongfeng-motor.com

Motor differential protection with differential quick break protection and with or without second

harmonic brake complex percentage differential protection,can be used in the three largest side of

the differential current input (three times),for an equipment voltage current analog and switch

quantity of powerful collection complete,equipped with standard RS485 and stator

industry CAN communication,and communication Through the rational allocation of main transformer

differential protection implemented three times,two main transformer differential protection,two laps

with a variable differential protection and generator differential protection,differential protection

and the electric motor Protection of protection and control functions.

YB series flameproof three-phase asynchronous motor

YB series flameproof three-phase asynchronous motor YB series flameproof three-phase asynchronous motor 1.1,2 dangerous gas places electric motor parts;2.A and B Ⅱ Ⅱ classes T1 - T4 group explosive gas or steam environment;3.Indoor,outdoor (IP54).YB series flameproof three-phase asynchronous motor acmotor2.blogspot.com technical characteristics 1.Cast iron shell,the surface coating;2.With high efficiency,rotor balancing machine large torque,low temperature,low noise,small vibration,safe and reliable;3.The cable or steel pipe wiring.

The winding of the motor faults

Winding is part and parcel of the motors, aging, be affected with damp be affected with damp, heat, erosion, foreign bodies, intrusion, the impact of the external force can cause damage to winding, motor overload, under voltage, over voltage, lack of phase operation can also cause winding fault. Winding grounding, short circuit, open circuit fault generally fall into winding, connection errors. 1, failure phenomenon Chassis charged, heat control circuit is out of control, winding short circuit, the normal operation of the motor. 2, the reason Make insulation resistance winding be affected with damp be affected with damp down? Motor overload for a long time to run? Corrosion of harmful gas? Metal foreign body into winding internal damage the insulation? Rewind stator winding Motor vehicle insulation damage when touch the core? Winding end touch end cover stand? , rotor friction caused insulation burn? Lead wire insulation damage into the shell? Overvoltage (such as lightning) insulation breakdown. 3, processing method, (1) winding drying should be affected with damp be affected with damp cause ground, when cooled to about 60-70 ℃, pour insulating paint again after drying. (2) the end winding insulation damage, in receiving is located in the back of the insulation and painting, dry again. (3) windings to place in the groove, diesel generating set should rewind or replace part windings components.