The classification and characteristics of ac regulated power supply

Able to provide a stable voltage and frequency of power supply according to ac regulated power supply.At present most domestic manufacturers is the work done by ac voltage stability.Below the market some ac regulated power supply,the classification characteristics. motor vehicle spare parts Parameter adjustment (resonance):this kind of regulated power supply,voltage stability is the basic principle of LC series resonance,the early type of magnetic saturation voltage stabilizer is belong to this category.It has the advantage of simple structure,without many of the components,reliability is quite high ac electric motor voltage range is wide,strong anti-jamming and resistance to overload ability.The disadvantage is that large energy consumption,noise big,bulky and high cost.On the basis of the principle of magnetic saturation of development into the formation parameters voltage stabilizer and China have been popular in the 50 s of "magnetic amplifier gather digital ac voltage stabilizer" (614) are the principle of ac voltage stabilizer.Autoformer (than) gather: 1,mechanical pressure regulating type,i.e.,according to the servo motor to drive the carbon brushes in autotransformer winding sliding surface move,change Vo on the ratio of the Vi,in order to realize the adjustment of the output voltage and stability.

The voltage stabilizer can from several hundred to several kilowatts.It is characterized by simple structure,low cost,the output waveform distortion small; But because the carbon brush sliding contact are prone to edm,brush damage that burned and failure; Slow speed and voltage regulation.Type 2,change the tap,autotransformer to make multiple fixed tap,through a relay or SCR (SSR) as switch machine 10,automatically change the tap position,so as to realize the stability of output voltage.This type of circuit voltage regulator the method is simple,wide voltage stabilizing range (130 v to 280 v),high efficiency (95%) or higher,the price is low.While the disadvantage is that low voltage stabilizing precision (plus or minus 8 ~ 10%) working life is short,it is suitable for the family to the air conditioner power supply.Power voltage compensation type electrical motor - purifying type (including precise voltage stabilizer) it USES compensation link to realize the output voltage stability,easy to implement microcomputer control.It has the advantage of good anti-jamming performance,high precision voltage (+ / - 1%) or less,fast response (40 ~ 60 ms),simple circuit,reliable operation.

The disadvantage is that: with the computer,program-controlled switches,such as nonlinear load are low frequency oscillation phenomenon; Input side current distortion degree is big,the source power factor is low; The output voltage to input voltage phase shift.Against interference function to demand higher units,it is advisable to apply in the city,computer power supply,must choose the computer about 2 to 3 times the total power voltage regulator to use.Because has stabilized,anti-jamming,the advantages of fast response speed,moderate price,so widely used.Switching regulated power supply: it is applied to the high frequency pulse width modulation technology,and it is the difference between general switch power supply output must be with the input side of the same frequency and phase ac voltage.It had quasi square wave output voltage wave type,type of ladder wave,sine wave,etc.,in the market for uninterruptible power supply (UPS) from the storage power supplies and chargers,ac voltage regulator is a switch mode power supply voltage regulator and control function is strong,easy to realize intelligent,is a very promising ac regulated power supply.But because of its circuit www.facebook.com/dongfeng.motor is complex,the price is higher,so to promote more slowly.

Sensorless brushless dc motor control - fly-wheel diode

(1) it requires that the inverter has to work in the power device take turns up and down in the way of PWM chopper, control is 3 phase induction motor difficult (2) it must be removed from the two aspects of hardware and software diode stream invalid signal conduction and the number of misleading communication due to burr interference (3) there are big error, this method also when K e very small or rotational speed is low, V, CE, V F compared wholesalemotor.blogspot.com to counter potential is not negligible, due to ignore the error due and certain phase compensation measures. fan cover Because of the above shortcomings and the insufficiency, this method is not widely used in domestic now.

Three-phase asynchronous motor fault analysis and processing method

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.Now separately failure phenomena,causes and inspection method.A,winding grounding Refers to the winding and iron core or with insulation casing damage caused by the grounding.1,failure phenomenon Chassis charged,heat control circuit is out of control,winding short circuit,the normal operation of the motor.2,the reason Winding insulation resistance decreased,motor overload long-term operation of be affected with damp be affected with damp,harmful gas corrosion,metal foreign body into internal damage to the wholesalemotor.blogspot.com insulation,rewind stator windings insulation when damage to core,winding end touch end cover frame,stator rotor friction cause burns,lead insulation insulation damage and shell,and overvoltage (such as lightning) insulation breakdown.Methods to examine 3.(1) the method of observation.

Through visual winding overhang and line slot insulation observed with and without damage and charred traces,is the pick up location.(2) the multimeter test.The multimeter low-resistance archives check,reading is very small,it is grounded.(3) megohmmeter.Selected according to different levels of different measuring each group resistance of insulation resistance by megger are,if the reading is zero,then the winding grounding,but the motor insulation be affected with damp be affected with damp or breakdown due to accident,must determine on the basis of experience,generally pointer swing timing in "0" place,its have certain resistance value can be thought of.(4) water pump motor try to light.If try lights,winding grounding,if found somewhere with a spark or smoke,is the place for winding grounding fault point.If lights dim the insulated grounding breakdown.If the light is not bright,but also showed a spark when the test stick ground,winding yet breakdown,just seriously be affected with damp be affected with damp.Also can use hardwood on the edge of the shell of the seam allowance tapping,to a certain place when a out a bright,when electrical current when broken,it is ground.

(5) current wear burning www.facebook.com/guohong.trading method.With a regulating transformer,after the power is connected,ground quickly small electric motors heating and insulation smoke is the pick up location.Should pay special attention to small motor shall not be more than twice the

rated current,no more than half a minute,large motor as 20% - 20% of rated current or increasing

current,burning to the ground just immediately without electricity.(6) packet elimination method.For

the pick up location in iron core and burning more severe,in my heart burning loss of copper and iron

core melt together.Approach is to put the grounding of one phase winding is divided into two and a

half,and so on,finally find out the ground.In addition,there is high pressure test method,magnetic

exploration method,power frequency vibration method,etc.4.The 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,on the insulation

processing is located in the back,painted and drying.(3) windings to place in the groove,should

rewind or replace part windings components.Finally apply different measured by megger,meet the

technical requirements.

Three-phase asynchronous motor is how to turn up?

After the three-phase alternating current flow into the three-phase stator winding,the stator cavity to produce a rotating magnetic field.Stationary before rotating the rotor conductors under the effect of rotating magnetic field,the equivalent of the rotor conductors relative to cut magnetic lines,which produced the induced current in the rotor conductors (electromagnetic wholesalemotor.blogspot.com induction principle).These just son of induced current in the conductor will electric motors price happen in production field movement (current effect of electromagnetic force).Due to the rotor inner conductor is always symmetrical layout,the electromagnetic force on the conductor produces the reverse direction,so as to form the electromagnetic torque,the rotor rotation.Due to the mini electric motor current in the rotor conductors are the stator rotating magnetic field induction,therefore also calls the induction motor.And as a result of the rotor speed is always lower than the speed of the stator rotating magnetic field,so is gasoline generator also known as asynchronous motor.

Motor model significance

Y series three phase asynchronous motor is totally enclosed fan since air-cooled squirrel-cage ac asynchronous motor,it is the latest series of uniform design in our country,the protective class is IP44.Y series motor with high efficiency,energy saving,large starting torque,good performance,low noise,small vibration,high reliability,power rating and installation size and conform to the IEC standards Use acmotortrading.blogspot.com convenient maintenance.Y series motors are suitable for excluding inflammable,explosive or corrosive gas general places and no special requirements of mechanical,such as:metal cutting Cutting machine,water pump,blower,transport machinery,mixers,agricultural machinery,food machinery,etc.Y series motor model consists of four parts:the first part of Chinese Phonetic alphabet Y said asynchronous motor; Second part Numbers stand center high (stand without a foot,and stand with when the generator rotor and stator foot is the

same).The third part of the English letters For the frame length codes (S - short stand,stand in the

M -,L - lead),letter after the digital code for the core length; Conditions of use ambient

temperature:no more than 40 ℃.Altitude:not more than 1000 meters.Relative humidity:less than 95 ℅

rated voltage:380 v.:rated frequency 50 hz.Connection:3 kw and the following to Y,4 kw and to For

answered.Work style:continuous (S1).Example models:Y132S1-2 3 kw Y.Y said asynchronous motor 132.The second part of the figures show that the frame Center high millimeters (stand without a foot,and

stand with when the foot is the same).S -.The third part of the English letters stand length codes (S

- short frame,the M - Stand,L - lead),letter after the number for the length of the core code; 1

-.Letter after the number for the core code length; - 2.The fourth part after the dash Figures for

the number of motor,this is a 2 pole motor.3 kw motor power of digital,said this is a complete

machine model.2 the meaning of Y132S1 - Righteousness is:the number of series number + base + The

first part of the Chinese phonetic 6v electric motor alphabet Y said asynchronous motor; The second part Numbers stand center high (stand without a foot, And to the same frame with foot); The third part of the English letters stand length codes (S - short stand,stand,L - the length of the M -),letter after the number for the core length Code; Conditions of use ambient temperature:no more than 40 ℃.Altitude:not more than 1000 meters.Relative humidity:less than 95 ℅ rated voltage:380 v.:rated frequency 50 hz.Connection:3 kw and the following to Y,4 mw and above for answered.Work style:continuous (S1).

Wholesale Electric Motors and Motor Parts

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