servo motor is mainly in the national economy and power-hungry

As is known to all,servo motor is mainly in the national economy and power-hungry,and energy saving is the motor industry an eternal theme.Some experts said,China's energy shortage is mostly caused by three phase induction motor energy waste and improper use.At present,the industrial energy consumption accounts for about 70% of the total energy consumption of electrical energy consumption accounted for about 60%~70% of the industrial energy consumption according to the survey,the level of IE1 motor market share of nearly 90% market share,while firms achieve IE2 above 8% high efficiency and energy saving motor that happened to the entire social resources enormous waste.So,to develop efficient motor is one of the important measures to improve energy efficiency,meet the needs magnet prices of the development of our country,is also very necessary. 

Servo motor rotor squirrel-cage often make it,but in order to make the servo motor has a wide speed range,linear mechanical properties.No "rotation" phenomenon and fast response performance,compared with the ordinary motor,should have the characteristics of small rotor resistance and moment of inertia of the two.The rotor current is widely applied structure has two forms: one is high resistivity of conductive materials made of high resistivity of the conducting bar cage rotor,in order to reduce the rotational inertia of the rotor,the rotor doing long and thin;Another kind is made of aluminum alloy hollow cup induction motor price rotor,glass is very thin,only 0.2 0.3 mm in order to reduce the magnetic resistance of magnetic circuit,should be placed in the hollow cup rotor stator fixed.The hollow cup rotor moment of inertia is small,responsive,and stable running,so widely used. According to our country attaches great importance to enhance the efficiency of the motor,it is enough to illustrate points: one is that in countries currently use less efficient motor,secondly,still have a lot of similar support measures for efficient servo motor.In addition,a good efficient motor mainly rely on import,prices high.In addition,most of domestic enterprises for production of high cost and high efficient motor data "forget and stop" this requires countries increase support for domestic motor manufacturing enterprises,the domestic product market competitive power as soon as possible.

The basic working principle of permanent magnet synchronous motor

The principle of permanent magnet synchronous motor as follows zhongtong into three phase current,the stator winding of the motor after the current will be formed in the stator winding of the motor rotating magnetic field,due to install the permanent magnets in the rotor,Magnetic pole of permanent magnet is fixed,according to the principle of magnetic pole of same-sex attraction heterosexual reactive,in the stator rotating permanent magnet generator 5kwmagnetic field generated by the drives the rotor rotate,eventually achieve the rotation of the rotor speed and stator equals the speed of rotating magnetic pole,so Can the starting process of permanent magnet synchronous motor as the asynchronous start-up phase and phase of pull in synchronization.In asynchronous start study phase,the speed of the three phase induction motor motor is gradually increased from scratch,the main cause of the appeal is its turn in asynchronous Moment,permanent magnet generator brake torque,torque of the magnetic resistance torque and single shaft by a series of factors such as asymmetry of rotor magnetic circuit and led caused under the function,so in the process speed oscillation is rising.

In the process of starting,torque,Asynchronous torque is the driving motor is only with this torque can be accelerated,most other torque is given priority to with brake properties.In motor increased from zero to nearly the speed of the rotating speed of stator magnetic field,under the influence of pulse vibration torque of permanent magnet Permanent magnet synchronous motor speed is likely to exceed the synchronous speed,and the basic working principle of single phase capacitor start induction motor permanent magnet synchronous motor The principle of permanent magnet synchronous motor as follows zhongtong into three phase current,the stator winding of the motor after the current will be formed in the stator winding of the motor rotating magnetic field,due to install the permanent magnets in the rotor,Magnetic pole of permanent magnet is fixed,according to the principle of magnetic pole of same-sex attraction heterosexual reactive,in the stator rotating magnetic field generated by the drives the rotor rotate,eventually achieve the rotation of the rotor speed and stator equals the speed of rotating magnetic pole,so Can the starting process of permanent magnet synchronous motor as the asynchronous start-up phase and phase of pull in synchronization.

In asynchronous start study phase,the speed of the motor is gradually increased from scratch,the main cause of the appeal is its turn in asynchronous Moment,permanent magnet generator brake torque,torque of the magnetic resistance torque and single shaft by a series of factors such as asymmetry of rotor magnetic circuit and led caused under the function,so in the process speed oscillation is rising.In the process of starting,torque,Asynchronous torque is the driving motor is only with this torque can be accelerated,most other torque is given priority to with brake properties.In motor increased from zero to nearly the speed of the rotating speed www.dongfeng-motor.com of stator magnetic field,under the influence of pulse vibration torque of permanent magnet Permanent magnet synchronous motor speed is likely to exceed the synchronous speed,the speed overshoot phenomenon occurs.But after a period of time after speed oscillation,finally in synchronous torque under the action of pull in sync.Speed overshoot phenomenon.But after a period of time after speed oscillation,finally in synchronous torque under the action of pull in sync.

Motor model parameters

Motor model is easy to use,design,manufacturing and other departments for business contact and simplified technology files in the product name,specification,type of narration and referenced by a symbol.Product code is made up of motor type codes,codes of characteristics and design of the serial number of three section sequence.Motor type code with:Y-said asynchronous motor;T-synchronous motor;Motor 220v electric motor characteristic code represent the performance of the motor,the structure or purpose and use of the Chinese phonetic alphabet. Such as explosion-proof type letters EXE (type) of increasing safety,EXB (flameproof),EXP (positive pressure type),etc.Design the serial number is high in center,core diameter,frame number,the flange 12v motor length,length of frame,core code,power,speed,or series of said.Such as:Y2-160 M1-8 diesel generator Y:models,asynchronous motor.

2:design the serial number,"2" for the first time based on the improved design of the product;160:high center,is the shaft center to the base plane height;M1:frame length specifications,M is medium,including footnotes "2" is the second M type core specification,type and "2" longer than "1" type iron core.8:pole,"8" refers to eight pole motor.Such as:Y 630-10/1180 Y said asynchronous motor;630 said power 630 kw;10,stator core diameter 1180 mm;The length of the frame adopt the internationally used symbol of letter;S is short frame type,M is the base type,type L is the length.Core length of letter with www.dongfeng-motor.com Numbers 1,2,3,in turn,said.

Three-phase asynchronous motor variable frequency speed regulation method

Frequency control of motor speed is to change the frequency of the motor stator power,to change its

synchronous speed control method.Variable frequency speed regulation system is the main equipment to provide frequency conversion power of inverter,the inverter can be divided into permanent magnet motors for saleac-dc-ac frequency converter and ac-www.dongfeng-motor.com ac frequency converter two kinds big,cross-straight-to pay inverter are mostly used in China at present.Its features:There is no additional loss of high efficiency and speed the process;Application range is wide,can be used in the cage type asynchronous motor;Large range of speed regulation,and the characteristics of ac motor wind generator hard and high precision;Technology is complex,high cost,difficult maintenance;This method is suitable for the requirement of high precision,220v ac electric motors better speed control performance.

Three-phase asynchronous motor winding fault analysis and processing

Winding short circuit Due to magnetic motor the large motor current is too large and the change of supply voltage and single phase operation,mechanical,manufacturing bruised bad insulation damage caused by such as winding interturn short circuit,short circuit between windings,winding interelectrode interphase short circuit and winding short circuit.1.The fault phenomenon Ion of the magnetic field distribution,unbalanced three phase current and make the motor vibration and noise when running,serious when motor can't start,and have great short-circuit current in coil of short circuit,lead to rapid heating coil and burned.

2.The reason Insulation insulation aging motor overload for a long time,lost;Wire insulation damage;Winding be affected with damp be affected with damp decreased insulation resistance caused by insulation breakdown;End and not cushion layer insulation material or plastic damage;End connection wire insulation damage;Or been struck by lightning overvoltage magnet prices insulation breakdown;Friction between rotor and stator winding end insulation damage;Too many metal foreign bodies fall into the inside of the motor and oil pollution.Methods to examine.

3.(1) the external observation method.Observation of junction box,winding end with or without burning,winding overheating after leave a dark brown,and has a bad smell.(2) temperature control method.No-load running for 20 minutes (found abnormal should immediately stop),with the back of hand touch winding parts is more than normal temperature.(3) the electricity experiment method.With current meter measurement,if one phase current is too large,have

indicated that the phase short circuit.(4) the bridge inspection.Measuring a winding dc

resistance,general difference should not exceed 5%,such as more than small,resistance of a phase

short circuit fault.(5) short circuit detection method.There is a short circuit the winding under test,the permanent magnet motors for sale sheet steel can produce vibration.(6) multimeter or megohmmeter.And any two phase winding insulation resistance measurement,if read very small or zero,shows that the two phase winding and has a short circuit.(7) voltage drop.After the three winding in series into the low voltage security alternating current (ac),the study measured a group of small fault.(8) current method.Motor no-load running,to measure the three phase current,in two phase switch,measure and contrast,if he does not change with the power switch,a phase winding large current has the short circuit.

4.Short circuit processing method (1) the short circuit point in the end.Insulating materials available to separate short-circuit point,also can be double insulated wire,to paint drying.(2) short circuit online slot.After the softening,find out the short circuit point repair,back into the trough,then paint drying.(3) the short route turns less than 1/12 of each phase winding,the serial number of turns all cut short route,connect the conduction part,forming a closed loop,supply urgent use.(4) winding short-circuit point when the number of turns more than 1/12,to dismantle all rewind.

Construction machinery used in motor maintenance rules?

(1) of the motor shell must make the pledge that we shall have good grounding or zero.(2)

periodically clean the machine work,purging of the compressed air,compressed air diesel

generatorshould be clean and shall not contain water and oil content,pressure should not

exceed 2~3 KGF/cm~2*1 KGF/cm~2 = 9.80665*10~4 Pa (3) the number of motor bearing grease should be stipulated by the original factory,no rules,should be combined with the working performance of the motor selection,filling quantity to be appropriate.(4) brushes,slip ring,or the processing of commutator and brush holder adjustment,must be a power outage.asynchronous motor (5) discontinued for a long acmotortrading.blogspot.com time and after the fault

treatment of motor,must by the insulation test qualified,can put into operation.Insulation resistance

shall meet the handover and the regulation of the preventive test electrical equipment in the

single phase generator regulations.Generally high voltage ac motor stator insulation

resistance should not be less than 1 M per kv ,rotor every 0.5 M kv; Low voltage of the motor stator

insulation resistance should not be less than 0.5 M ,rotor should not be less than 0.15 M.

Construction machinery use collector device maintenance rules?

Quarterly needed after a power outage 220v ac electric motor soverhaul:(1) cleaning the dust,tighten bolts.(2) porcelain should be in good condition,if there is any breakage,should be replaced.(3) the contact between www.dongfeng-motor.com the brush and slip ring should be good,spring pressure is appropriate.(4) the slip ring surface such ac geared motor as a

depressed,burr,should be grinding.(5) check the presence of flashover phenomenon,measuring insulation resistance.(6) correction difference of each ring,which make the level of the ring to meet 220v ac electric motors the design requirements.