Switch the characteristics of the present and future - SPC exchange and technology trends

 Totally Enclosed Protect Feature and Three-phase Phase low rpm ac electric motor
Specifications
Specifications1.3-phase asynchronous motors
2.IEC standard
3.OEM
4.Voltage:50HZ &60HZ;380V&415V
5.Protection class: IP54
 SPC digital exchange is the modern digital communication technology, computer technology single phase ac motor and large scale integrated circuit (LSI) products of organic combination. Advanced hardware and perfect the software integrated into an organic whole, give the SPC exchange with many functions and features, to make it compared with the mechanical and electrical switches, has the following advantages: 1. Small volume, light weight, low power consumption, it is only about 1/8 of the crossbar switch volume - 1/4, greatly compress the room occupancy area, save the cost. 2. The flexibility to provide customers with numerous new business services. Because of using the SPC technology, thus it can be convenient by the software increase or modify the switch function, to provide customers with new services, such as abbreviated dialing, call waiting, call transfer, call forwarding, busy callback, the single phase induction motor hotline, conference calls, has brought great convenience to users. 3. Stable and reliable work, convenient maintenance, due to the large scale integrated circuit (LSI) commonly used SPC exchange circuit or application-specific integrated circuit (ASIC), and therefore has a high reliability.

 generator Stator Rotor 
Specifications
1. 20 years manufacturing experience 
2. competitive price,high quality 
3. Accessories Series: stator and rotor 
It usually USES the redundancy technology or automatic fault diagnosis measures, to further improve the reliability of the system. In addition, the SPC exchange with the help of a fault diagnosis program for automatic fault detection and location, and to discover and troubleshooting, thereby significantly reducing the workload of maintenance. System can easily provide automatic billing, traffic, service quality automatic monitoring, overload control and brought convenient to maintenance and management work. 4. Easy to use the new total signal way (CCS, Common Channel Signalling). Because of SPC Digital switches and Digital transmission equipment can be directly to Digital connection, providing motor electric high-speed public channel signal, is suitable for the use of advanced way of CCITT no. 7 signalling, so as to make the signal transmission speed, large capacity, high efficiency, and can adapt to the future new business and the characteristics of the Network control, in order to achieve the comprehensive Network (ISDN, Integrated Services Digital Network) to create the necessary conditions. 5. Easy and digital terminal, digital transmission system, digital terminals, transmission and exchange of integrated and unified. Can expand communication capacity, improve quality, reduce investment, communication system and for the development of integrated digital network (idns) and integrated services digital network (ISDN) lay the foundation.

Electrical engineer for the selection of step motor

 

Stepper motor can transform electrical pulse signal into angular displacement or linear displacement.In the range of the rated power of the motor speed depends only on the pulse signal frequency and pulse number of control,and not affected by load change,coupled with step motor characteristics of cumulative error is small,in areas such as speed,position with stepper motor to control becomes simpler.Stepper motor three kinds,mainly is the hybrid stepping motor is widely used.When choosing a stepper motor,must pay attention to the following parameters as the manufacturer (are supplied with the motor):Step 1) from the Angle of: after receiving a step pulse motor rotation Angle.The actual interval Angle and fine fractions of the drive.Generally the precision of the stepper motor to step away from the Angle of 3-5%,not cumulative.2) number: the inside of the motor coil set number.Step phase number is different,is apart from the different Angle.If using subdivision driver,'phase number does not make sense: change the fine fraction can change electric motor cooling fan interval Angle.3) keep the torque: also called the largest static torque.

Refers to the rated power flow speed is zero,the external force force needed for the rotor rotational torque.Keep the torque has nothing to do with the drive voltage and drive power supply,etc.Stepper motor at low speed torque close to holding torque.As a result of the stepper motor output torque and power increases with the speed and constantly changing,so keep the torque is measured step motor is one of the most important parameters.Although holding torque is proportional to the electromagnetic excitation ampere turn,with the air gap between the rotor teeth.But too much by reducing the air gap,increasing the excitation ampere turns to improve static moment is not desirable,it will cause heating of the motor and the mechanical noise.Keep the torque type determined as follows: Stepper motor dynamic torque a while it is difficult to determine,tend to make sure the static torque of motor.Static moment of choice was based on motor work load,the load can be divided into two kinds of inertia load and friction load.Single inertial load,and there is no single friction load.Order more (generally by low speed) when (suddenly) starting when the two kinds of load are to consider,when accelerating (slopes) starting main consideration of inertia load,constant speed run into as long as considering the friction load.In general,keep the friction load torque should be within diesel generating set 2 to 3 times as well,holding torque once selected,motor frame and length can be set down.

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 generatorY: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.

power factor compensation

An overview,In ac circuits,the phase difference between voltage and current cosine is called power

factor,with symbol cos said on numerical value,the power factor is the ratio of active power and

apparent power,namely the cosine = P/S.Power load of power grid,such as motor,transformer,fluorescent

lamp and the electric arc furnace and so on,mostly belong to the inductive load,the motor inductive equipment in operation process is not only need to absorb the active power in power system,also absorb reactive power at the same time.So the parallel capacitor reactive power compensation equipment installed in the power grid,will be able to provide compensation reactive power consumed by a perceptual load,reduce the power grid power supply side perceptual load and by line transmission of reactive power.Reduce the reactive power flow in the grid,can reduce the transmission and distribution lines transformer and bus power loss caused by the transmission of reactive power,this measure is called power factor compensation.Owing to the rise in the power factor is the root cause of the reactive power reduce,so often called power factor compensation of reactive power compensation.In a large system,reactive power compensation is also used to adjust the voltage of power grid,improve the stability of power grid.In a small system,through proper reactive power compensation method also can adjust the unbalanced three-phase current.According to the wangs theorem:in phase to phase and jumper inductor or capacitor can be transfer active current.For three-phase current unbalance of system,therefore,as long as appropriate in each phase to phase and phase zero access between different capacity of capacitors,acmotortrading.blogspot.com not only can be in each phase of power factor compensation to 1,and can make the active current of each phase equilibrium state.Second,the method System of compensation for reactive power compensation's main purpose is to improve the power factor.

Because of the power supply bureau of electricity is KVA or MVA to calculate,but the fee is to KW,which is actually doing useful work rate,a reactive power between the difference,in general is the reactive power in KVAR.Most lost work are inductive,that is generally called motor,transformer,fluorescent lamp.almost all of the lost work are inductive,capacitive is very rare.That is because of the existence of the inductive,caused a KVAR value in the system,is a trigonometric function relationship between the three KVA square = KW square+KVAR square Simple speaking,in the above formula,if today's KVAR value is zero,KVA will be equal to KW,the power supply bureau of 1 KVA electricity is equal to the user 1 KW consumption,the most cost-effective,so the power factor is a factor of power supply bureau is very care about.The power factor of the user if there is no ideal,relatively is the resource consumption in power supply bureau,so that is why the power factor is a regulatory restrictions.At present in terms of domestic power factor regulation must be between 0.9~1 inductive,below 0.9 need to accept the punishment.This is why we have to control the power factor in a very sophisticated.Some of the power electronic equipment such as rectifier,inverter,switching power supply,etc.; Saturable equipment such as transformers,motors,generators,etc.; Electric equipment and three phase induction motor price electric light source equipment such as electric arc furnace,fluorescent lamp,etc.,these devices are the main source of harmonic,the runtime will produce large amounts of harmonic.Harmonic on the engine,transformers,motors,capacitor etc all electrical equipment connected to the grid size,main show is harmonic generation additional loss,make the insulation of the equipment overload overheat and harmonic overvoltage accelerated aging,etc.Parallel to the line on the reactive power compensation capacitor to the harmonic amplification effect,causing the system voltage and current distortion is more serious.In addition,the harmonic current superimposed on the fundamental wave current of capacitor,can make the capacitor current of effective value increase,leading to higher temperature,reduce the service life of the capacitor.Harmonic current increase the copper loss of transformer,cause local overheating,vibration and noise increases,additional heating winding and so ac alternators 220v on.Harmonic pollution can increase cable transmission line loss.And harmonic pollution affect communication quality.When the current harmonic component is higher,may cause relay protection of overvoltage protection,overcurrent protection misoperation.Therefore,if the system is of high harmonic content,in addition to the series capacitor side need appropriate tuning (detuned) reactance,and installation of harmonic improve device for load characteristic project discussion.