Master electrical troubleshooting method 2

 electric motor 20hp aluminum body 
Specifications
1. 20 years manufacturing experience
2. competitive price,high quality
3. Brand Name: FUJIAN DONGFENG MACHINERY ELECTRICAL LIABILITY CO., LTD

Faults exclusion is an important work of maintenance personnel, to eliminate the fault, must know the cause of the failure, more important is can theoretically analysis, solve the fault occurred, should have certain professional theory knowledge, to master the methods of troubleshooting. (a) current test method: test method is usually in the measurement circuit current conformed to the normal, a method to determine the cause of the electrical motor 12v 1000w problem. For low voltage circuit, often use the ammeter or multimeter current file concatenated in circuit to measure; For high voltage circuit, often using clip-on ammeter test. (2) the instrument test method: with the aid of all kinds of instruments to measure ac electric motor various parameters, such as using oscilloscope to observe the waveform and the change of the parameters, in order to analysis the cause of the failure, much used in low voltage 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 

5. AC Voltage: 220V/380V, 380V/660V,400V/690V,220V/400V

(3) the conventional method: rely on human sense organs (such as: some burning in the electrical equipment in use, the smell of burnt food lighter, discharge phenomenon, etc.) and with the aid of ~ simple instruments (e.g. multimeter) to find the cause of the problem. This method is the most commonly used in maintenance, is also used in the first place. (4) to replace the original accessories: in doubt a device or circuit board is faulty, but not sure, and there are alternative parts, alternative test, to see whether the fault disappear, returned to normal. (5) electricalmotor1.blogspot.com direct method: to understand in the cause of the problem or according to the experience, judge the location of the failure, can be directly check suspect point of failure.

Indoor machine control circuit principle

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 

5. AC Voltage: 220V/380V, 380V/660V,400V/690V,220V/400V

47 c862an special chip indoor machine control circuit adopts frequency conversion air conditioning - Gc5l. The chip single phase motor price inside besides writing special air conditioner program, also contains a microprocessor, program memory, data memory, CPU, input and output interface and timing counter Induction motor circuit and other circuit computation and comparison of wholesalemotor.blogspot.com input signal, on the lamination basis of the result of the operation and compare of separate-bodied air-conditioners, fans, timing, cooling, heating and wetted condition control.

IRMCF341 in the application of variable frequency electrical appliances

 IRMCF341 international rectifier (IR) in the United States new sensorless control for variable frequency electrical appliances application of high performance low cost motor control IC. It adopts the most advanced based on the motor vehicle spare parts magnetic field orientation vector control technology, using the single resistance current sampling the motor can be realized in three phase current refactoring, so as to realize the FOC current loop and speed AC synchronous generator loop, double closed-loop vector control, drive mode for 180 degrees of sine wave. IRMCF341 contains two high-performance processing engine, one is 8 bits high- speed 8051 cores, generator set spare parts the other one is to control the motor sensorless control of 16 engines (MCE). 8051 nuclear execution speed for every two system clock an instruction (such as: 60 MIPS @ 120 MHZ system clock). 8051 nuclear and MCE processor: by dual port RAM data exchange between so as to realize the function of data monitoring and command input. 


MCE contains all the necessary based on hardware circuit control motor control resources, such as PI regulator, vector rotation, Angle estimator, multiplication/divider, low loss of SVPWM, and single resistance current sampling/restructuring, and so on. Sensorless control algorithm of the key elements of complex (such as: Angle estimator) all have defined acmotortrading.blogspot.com control module, the user can through the use of the seamless connection with MATLAB/SIMULINK environment graphical compiler to design your own motor control algorithm (in MATLAB/SIMULINK environment by connecting the modules function module and compiles). 8051 code simulation and debugging can be through a third party based on JTAG mouth debugging tools to complete. Procedure in 51 IRMCF341 memory to 48 k RAM, packaging form for small QFP64 lead-free packaging.

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.

The power output

Power output is on-board host to the speaker output audio signal power and the number of channels,usually with each channel output to indicate the power multiplied by permanent magnet generator the number of channels.On-board host in the car audio system similar to the original function of DVD home theater,but inside the car space is precious,so integration is electrical motor very demanding.In order to satisfy the space requirements,many car the host with the function of the power amplifier,of course,not all on-board host with amplifier function,if there is no power output,then it must be with connect car-mounted function www.facebook.com/dongfeng.motor of the power amplifier.To be sure,with the power output of the host can be connected directly to the speaker,but most of the host also can connect an external amplifier,unlike home theater VCD,host of the pre - the electrical motor 24v output voltage is higher,so the different host to the requirement of the power amplifier,when the choose and buy should pay attention to collocation.

High-performance vector control ac speed regulating

High-performance vector control ac speed regulating system needs the support of modern control

theory,for ac motor,currently the most widely used is the "vector control scheme.Since 1971,Germany's

Siemens F.B laschke vector control principle,put forward the control scheme is popularity.Therefore,in-depth study on it.Vector control of the basic idea is:in ordinary three-phase ac motor on the simulation of the dc motor torque control law,the magnetic field orientation coordinates by the vector transformation,the three-phase ac motor stator current is decomposed into excitation current and 220v ac electric motorstorque current component,and make the two component perpendicular,independent of each other,and then adjust respectively,in order to obtain good dynamic characteristics as dc motor.So the vector control is the key of stator current amplitude and spatial location (the control of frequency and phase).Vector control is the purpose of improving torque control performance,the final implementation is to id,IQ's control.

Due to the quantity of the stator side is communication,the space vector in space to synchronous speed rotation,so isn't very convenient for adjustment,control,and computing.Need a complex coordinate transformation of vector control,and reliance on motor parameter is large,it is difficult to guarantee complete decoupling,make the control effect.3.3 direct torque control of vector control scheme is an effective ac servo motor control scheme.But because of the need of complex vector rotation transformation,and the mechanical constant is lower than the electromagnetic constants of the motor,so can't quickly response to the torque vector control.In view of the vector control of this defect,German scholar Depenbrock in the 1980 s proposed a control scheme with fast torque response characteristics,namely direct torque control (DTC).This control scheme to abandon the idea of decoupling control vector control and current feedback loop,adopt the method of stator flux,using discrete two point control of the stator flux linkage and torque of the motor directly adjusted,has simple structure,fast torque response,etc.The earliest used in induction motor DTC,1997 L Zhong and others,the modification of DTC algorithm for permanent magnet synchronous motor control,there are related to the simulation and experimental research.DTC method to realize double closed loop control of flux and torque.

After getting the flux linkage and torque of the motor values,the permanent magnet synchronous motor DTC.Figure 2 shows the permanent magnet synchronous motor DTC scheme structure diagram.It consists of permanent magnet synchronous motor,inverter,torque estimation,flux estimation and voltage vector switch table link,the ud,uq,id,IQ as static (d,q) voltage and current components in the coordinate

system.Though,the study of DTC has made great progress,but in theory and practice is not enough

mature,such as:low speed performance,load capacity,etc.,and its high real-time requirements,large amount of calculation.3.4 decoupling control of permanent magnet synchronous motor mathematical model after coordinate transformation,id,id still exist between coupling,cannot achieve the independent

regulation of id and IQ.If you want to make the permanent magnet synchronous motor to obtain good dynamic and static performance,it must solve the id,IQ of decoupling problem.If can control id

constant 0,can ac geared motor simplify the equation of state of permanent magnet synchronous motor for:at this point,the id and IQ has no coupling relation,Te = np bits of fiq,independent adjustment IQ can

realize the linearization of the torque.Decoupling control,realize id constant 0 voltage type can be

used decoupling and current mode decoupling.

The former is a completely decoupling control System solutions,can be used to id,generator stator IQ completely decoupled,but implementation is more complicated; The latter is a kind of approximate decoupling control scheme,the control principle is:select appropriate id ring current regulator parameters,make its have considerable gain,and always make the controller of the reference input command id * = O,id available material id * = 0,IQ material IQ * O,thus to obtain the approximate decoupling of permanent magnet synchronous motor.Figure 3 shows based on vector control and id * = O decoupling control of permanent magnet synchronous motor speed control system block diagram.Although current mode decoupling control scheme can't completely decoupled,but is still an effective control method,as long as take the better way to handle it,also can www.facebook.com/guohong.trading get high accuracy of torque control.Therefore,to use the current engineering type more of decoupling control scheme.Current mode decoupling control,however,can only achieve the rotational speed of motor current and static decoupling,if the dynamic coupling will influence the control accuracy of the motor.In addition,current mode decoupling control by making the coupling of a remains the same,will introduce a lagging power factor.

Structure and working principle of the generator is what?

Generators are usually made of stator and rotor,end cover and bearing

www.facebook.com/guohong.trading components.By the stator core,stator line

winding,stand and fixed the parts of other structures.Rotor by the rotor core (or a magnetic pole,the

conjugate) 220v electric motor winding,retaining rings,central ring,slip ring,fan and shaft parts.The generator rotor rotate by the prime mover,when direct current (dc) after the rotor winding for carbon brush and slip ring access,rotor can produce magnetic fields.Due to the rotor is constantly perkins diesel generator rotating,so the diesel generator magnetic field is a rotating magnetic field,it and the relative motion is formed between the stillness of the stator winding,equivalent to the stator winding in constant cutting lines,and will in the stator winding induction electromotive force.The direction of the induced electromotive force of the stator,is decided by the right-hand rule.For Ren Yigen of coil wire,in the process of the rotation of the rotor,sometimes N pole toward it,S very on it,sometimes different

polarity in the winding induction electric potential orientation is not the same.Back and forth

direction change,this is an alternating current.

Programmable controller

(PLC) and its application of relay contactor control system is widely used in production for a long

time,but because of its complex mechanical contact more,wiring,High reliability,low power

consumption,and when the production process changes need to be redesigned 6v electric motor and control circuit,versatility and flexibility is poor,so can't satisfy increasingly The complicated and

changeable modern production process control requirements.And the programmable controller will relay contactor control combined with computer technology,the advantages of using "software Cheng "instead of the relay contactor control" hardware wiring ".When the system function need single phase induction motor to be changed,just change a few external connection,mainly by modifying the corresponding control procedures Can.Using PLC to replace the ordinary relay circuit to realize Y/Δ starter will be more convenient and reliable,to solve the above problems are also more easily.PLC (programmable Controller) is a kind of microcomputer technology as the core of the automatic control device,is superior to other control device of acmotortrading.blogspot.com many functions,such as:(1) high reliability and anti-interference ability Strong;Variable,(2) the control program can achieve flexible control;(3) control and processing function is perfect (analog input P output,PID control,arithmetic,etc.);(4) network and communication functions (configure the network adapter or can communication card and network or other communication controller),etc.When USES the PLC control ac asynchronous motor,it Are better able to realize logic control,process control and data communication,to achieve automatic control of a new level.