Current transformer epsilon % error curve calibration step

 Cast Iron electrical motor auto spare parts 
Specifications
1. 20 years manufacturing experience 
2. competitive price,high quality
3. Delivery Detail:within 10 days after receiving deposit
Calculate according to the protection type (1) an single phase motor electric current flows through the current transformer ratio; (2) according to the model of current transformer, variable ratio and a current ratio, on the 10% error curve to determine the permission of the current transformer secondary load; (3) according to the most severe type of short electric generator circuit current transformer secondary load, the calculation of current transformer actual secondary load; (4) the practical secondary load and allow the secondary load. Such as the actual secondary load is less than the allowed secondary load, said current transformer error less than 10% error: 1) increasing the connection wire section or shorten the connection wire length, Three phase motor to reduce the actual secondary load; 2) choose larger current transformer, reduce a current ratio, increase to allow secondary load; 3) the secondary winding of current transformer in series, a doubling of allowing the secondary load.

The development trend of program-controlled exchange technology and trends

 generator Stator Rotor 
Specifications
1. 20 years manufacturing experience 
2. competitive price,high quality 
3. Accessories Series: stator and rotor 
1. The development of new type special large scale integrated circuit, improve the level of integration and modular hardware, in order to further reduce the volume, reduce costs, enhance function and improve reliability. 2. Improve the decentralized control, flexibility and reliability of phase in distributed way. 3. Using CCITT (ITU) suggested a high-level language (e.g., CHILL, SDL, MML), improve electric fan motor the level of software and modularization. Enhance the development of support system, powerful software generation system is established. 4. Actively promote total signal system. 5. To phase in the business, such as data, fax, Telex (Telex) and intelligent Telex (Teletax), visual data (Videotex), figure on 220v electric motor the visual (Teletext) and E-mail (Electronic Mail), image information and so on, the acmotortrading.blogspot.com development of the corresponding interface, constitute a comprehensive information exchange system. 6. Strengthen the program-controlled exchange system and other types of communication network (such as fax net, packet-switched networks, or public data network, computer local area network (LAN) interface, connection and networking capability. 7. In order to adapt to high speed information business growing demand and the development of optical fiber communication, to carry out the broadband integrated services digital network (ISDN) - B environment exchange theory, system and key technology research. One of the highlights of the present study for asynchronous transfer mode of ATM.

The chip IC2 outdoor (main pin function (9821)

IC6 1 foot will reset signal sent to the microprocessor reset end of IC2 27 feet, IC2 began to work. IC2 first detection of outdoor temperature, the temperature of compressor, outdoor heat exchanger temperature, if not normal, issue exception information to the indoor machine through serial communication interface, and display the www.dongfeng-motor.com fault alarm. If normal, accept refrigeration command from the indoor machine, IC2 52 to ICl (4) feet, output level inverter ICl 13 feet into a low level, make SW3 electric suction, short-circuit PTC1, to provide power module working current. After a delay, Ic2 from 55 feet, output level to Icl is the first (1) the foot, inverter Icl output low level 16 feet, make SWl electric suction, outdoor fan to work in low gear. generator set spare parts At the same time, Ic2 from (4), (5, 6, 7), and 0 ~ 30 ~ 125 hz pet-name ruby foot drive signal to the power module, make the compressor work. 

If the set temperature and indoor temperature difference is bigger, full capacity signal from CPU to the house, the air conditioner by three horse, a horse to the outdoor fan automatically transform into high speed gear ac motor at the same time. If indoor machine heating command, the IC2 outdoor from 53 feet to ICl output level (3) feet, ICl from 14 feet output low level, make the SW4 absorption, electromagnetic valve to suck, refrigerant change flow direction, air conditioner, heating, light up the circuit of LED lights on the outdoor at the same time. Air conditioner work, IC2 from 18 feet to monitor lamination the working current, flow signals, if two consecutive seen, the exception of the judgment, immediately shut off the outdoor fan and the compressor, and the fault signal to the indoor machine, outdoor indoor machine shut down and displays a fault alarm. In general, outdoor fan and the compressor start at the same time, but after 30 seconds later shut down (unless specified).

New type of automobile permanent magnet generator and its application prospect

 New type of automobile permanent magnet generator and its application prospect The new permanent magnet generator,automotive development and application At present,the main motor generator is silicon rectifying generator.The main defects such as: magnetic field generated by the electric field winding,rotor field winding burned,break easily,electric consumption,and must be provided by the battery field current to power generation,this is bound to increase the car cost.Silicon rectifying generator with a carbon brush slip ring structure,the slip ring diameter is large,high linear velocity,carbon brush is easy to wear and short service life,high failure rate.The other is a brushless generator,it increases the air gap magnetic field,the magnetic flux leakage,low material utilization,cost is high.Domestic automobile generator is mainly ferrite permanent magnet alternator,power under 200 w,not directly to automotive wiper,heater,electric horn,such as dc power supply,also can't give battery charging.At home and abroad in recent years,with a new generation of rare earth NdFeB permanent magnet materials,transforming traditional claw auto alternator,with high precision control and regulating circuit,the advanced technology of permanent magnet motor generator system.

Such as JFYW series vehicle permanent magnet alternator,USES the ndfeb permanent magnet,compared with the line around the excitation generator,not made of black metal casting (forging) claw pole and the yoke,without excitation coil,without brush and collector ring.Has the features of simple structure,reliable operation,long service life,small volume,light weight,less loss,high efficiency,low cost,and improve the vehicle electrical properties etc,and does not produce interference of on-board electrical appliances,reduce the battery charge and discharge frequency,director of the service life of the battery,the battery completely without electricity or out of the special circumstances of the battery,starter drive car.Since this series generator with low forward unique design,therefore,by the majority of urban transit system and low speed slow for a long time,frequent starting stop users widely recognized and applied. Second,the structure of the permanent magnet generator Automobile permanent magnet generator including casing,rotor,stator and other components.Fixed on the outside of the rotor steel shaft with weak magnetic circle,weak permeability round set has a groove,groove on with permeability and strong permanent magnet blocks,permeability and strong permanent magnet blocks of ratio of 2:1,the number of two pieces of permeability blocks and the clamp in the middle of the a strong permanent magnet blocks,a pair of poles with weak magnetic material between two pairs of magnetic poles apart,each pole of the adjacent opposite polarity.

The generator is suitable for automobile,engineering machinery,such as motor vehicles and stationary power plant as the charging power supply of the power supply.It consists of the excitation of the three-phase permanent magnet synchronous generators,after rectification,the output and parallel to the car battery power supply,electrical equipment at the same time can also to the battery.The generator in the development of not only successfully solves the permanent magnet generator under variable speed and variable load conditions of voltage stability problem,and solved the permanent magnet generator short circuit,fault protection,has high precision,high efficiency,low pressure charging performance is good,the advantages of larger than power,has a broad application prospect.Promote the use of automobile permanent magnet generator,can save a lot of energy,prolong the service life of battery,improve the economic efficiency of operations,but also conducive to the development and utilization of the rare earth resources of our country. Three,the permanent magnet generator technical advantages of the system Magneto's advantage is that it can be in 0 ~ 15000 RPM and high temperature environment to work properly,its motor parts advantages are: (1) no battery power.Because of its rotor is a permanent magnet,without excitation current,as long as the engine driven rotation can generate electricity,save energy,compared with the same volume of excitation generator,can get double the same circumstances,the output power,and when the damage to the vehicle battery power supply system in travel can still work normally,even without the battery,as long as the rocking forward motivation or slide ignition operation can be realized. 

(2) the power supply at low speed performance is good,small voltage regulation.When the power is low,the electromagnetic parameters of the same case,silicon rectifying generator zero current,permanent magnet generator can be exported 3 a ~ 5 a "field current",greatly improve the power water pump performance at low speed.As small leakage,direct axis and quadrature axis armature reaction reactance is small,the armature reaction is weak,so the voltage regulation is small,its external characteristic is relatively flat,high power,output voltage stability is also very good. (3) simple structure,reliable operation,stable performance.Only on the rotor structure of permanent magnet generator shaft,claw pole,wafer type ndfeb,simplify the processing procedure.A 25% reduction in weight compared with the same power generator,prolong the service life of the bearing,and effectively reduce the brush and slip ring friction of radio interference.Permanent magnet generator avoids electrical excitation generator excitation winding is easy to burn,bolt and the problem of carbon brush and slip ring is easy to wear.Electronic regulator and generator etc,make the generator overall realize dc output,small volume,light weight,easy to maintain.The attention of the auto industry.

From time to tome noise motor

Mechanical parts and electromagnetic part of motor fault points,distinguish method: first to make the motor operate,carefully listen to the voice of the running,and then a power outage,let the motor inertia magnet motor continues to run,if not normal voice disappear at this moment,that is the motor electromagnetic fault,otherwise is motor mechanical failure.Mechanical noise,A noise from the bearing,may be damaged bearing ball,lubricating oil is too little,then A screwdriver head outside the bearing oil was built,petiole near the ear,can hear the sound of loud gurgling.B air noise was generated.The sound is very uniform,is not very strong,can be judged as normal.

C electric JiSao chamber caused by noise,the noise features a scrape of a sound,for the motor,have just completed the runtime if find any noise,can check to see if the current balance,www.dongfeng-motor.com the rotation is flexible,speed up to rated speed,above if no problem,may be in the stator slot insulation paper or bamboo chip slit,protrudes from the rotor instead of the mo was found when the sound is characterized by both sharp rotor and stator and high.Electromagnetic noise: A bad cooperation length of rotor and stator,the rotor length refers to A bearing to another bearing distance,the length of the stator refers to from A bearing chamber to another the distance of the bearing chamber,under normal generator stator circumstances,the stator length slightly longer than the rotor length,such as vary too much,may be A low "om" sound.B the rotor axial displacement,the displacement of electromagnetic noise can occur,and cause the no-load current increases,the battery performance of the motor.C of the stator,rotor slot number mismatch,the wrong loading other rotor assembly process.D breath uneven between stator rotor,stator rotor circle,also may be a slight bend axis,etc.Lack of phase,in addition,the motor winding interturn short circuit,phase short circuit,overload operation,etc all can cause electromagnetic noise.

Motor speed control method

Motor speed control method are many,can adapt to the requirement of different changes in the rate of production machinery.General motor adjustable electric motors price motor Motor

speed when the output power will change with the rotational speed.From the perspective of energy

consumption,speed can be roughly divided into two kinds:(1) the input power.By changing

acmotortrading.blogspot.com the diesel generator speed regulating

device of energy consumption,adjust the output power by adjusting the rotational speed of the motor. (2) to control the motor input power to adjust the speed of the motor.Motor,motor,brake

motor,frequency electrical motor conversion motor,speed motor,three-phase asynchronous motor,high voltage motor,multi-speed motor,two-speed motor and explosion-proof motor.

Three-phase asynchronous motor speed control application

Widely used three-phase asynchronous motor, but after running through a long time, can produce all kinds of fault, determine the cause of the problem in time, the corresponding processing, is to prevent failure, ensure the normal operation of equipment is an important work. A, after electrify motor does not turn, then fuse 1. The cause of the problem (1) the lack of a power supply, or set the main circle a contrary; (2) and stator winding short circuit; (3) of the stator winding grounding; (4) of the stator winding wiring error; (5) fuse section is too small; 5. The power cord short circuit or grounded. 2. The troubleshooting (1) to check whether there is a knife switches are not good, can be a phase break power supply circuit; Eliminate the reverse fault; (2) find out short circuit point, repair; 3. Eliminate grounding; (4) detected misconnection, be corrected; 5. Replace the fuse; (3) to eliminate ground point. Second, l. the cause of the problem (1) set, rotor winding circuit (a break) or loss of electric power supply a photograph; (2) winding lead beginning end wrong or winding inside the; (3) the power supply circuit of loose contact, contact resistance; (4) the motor load is too large or rotor stuck; (5) the power supply voltage is too low; 6. Small motor assembly is too tight or bearing grease is excellent; All landowners bearing stuck. 2. Troubleshooting (1) find out the breakpoint repair; (2) check the winding polarity; Judge winding ends is correct; (3) fastening screw loose connection, use the multimeter judge whether each joint false, repair; (4) the lightening or detect and eliminate the mechanical failure, (5) check also is the surface connection misconnection Y; Whether due to the large power supply wire carefully make the pressure drop, corrected, 6 reassemble makes it flexible; Replace the qualified grease; All landowners to fix the bearing. 

Four, after electrify motor cannot turn, but no ring, no peculiar smell and smoke 1. The cause of the problem (1) the power did not pass (at least two phase flux); (2) the blown fuse (at least two mutually fusing); (3) overcurrent relay adjusted too small; (4) control equipment connection errors. 2. The troubleshooting (1) check the power supply circuit switch, fuse, junction box, is there a breakpoint, repair; (2) check the fuse model, fusing the reason, a new fuse; (3) regulating relay setting value and motor coordination; (4) correct wiring. Third, the motor starting difficulty, rated load, motor speed is lower than the rated speed 1. The cause of the problem (1) the power supply voltage is too low; (2) the surface connection motor misconnection Y; (3) the cage rotor welding or fracture; (4) stator coil of local pick up, pick up the wrong; (3) increase the number of turns when repair motor winding too much; (5) motor overload. 2. The troubleshooting (1) to measure the power supply voltage, trying to improve; (2) the correct connection; (3) check the open welding and breakpoint and repair; (4) found it by accident, shall be corrected; (5) to restore the correct number of turns; 6. Lightening. After electrify motor does not turn a hum Five, motor racing, load, ammeter pointer instability, oscillation Article 1. The cause of the problem (1) the cage rotor guide open welding or broken; (2) wound rotor fault (a circuit) or poor contact brush, collector ring short circuit devices. Article 2. The troubleshooting (1) find out fault repair or replacement of the rotor; (2) check and repair wound rotor circuit. Six, motor no-load current imbalance, phase difference is big 1. The cause of the problem (1) the rewind, stator three phase winding circle number not equal; (2) the first end winding wrong; (3) the power supply voltage imbalance; (4) there winding interturn short circuit and coil reverse fault. 

2. The troubleshooting (1) to make child winding around; (2) check and correct; (3) to measure the power supply voltage, trying to eliminate imbalance; (4) forms in addition to the winding faults. Seven, motor running noise is not normal, there are sound 1. The cause of the problem (1) the rotor and stator insulation paper or slot wedge facies; (2) oil bearing wear or with sand and other foreign body; (3) loose stator iron core; (4) bearing oil shortage; (5) to fill or brush wind hood fan, air duct and stator iron core facies; All landowners supply voltage is too high or not balance; End of the stator winding fault or short circuit. 2. The troubleshooting (1) clip insulation, low cutting slot wedge; (2) replace bearing or cleaning bearing; (3) maintenance and repair, motor parts the rotor iron core; (4) come on; 5. Clean up the air duct; Reinstall the place; 6. Remove the scratch, when necessary, the car small rotor; 7) check and adjust the power supply voltage; The stator windings faults was eliminated. Eight, the number of motor vibration in the operation of the larger 1. The cause of the problem (1) due to wear and tear bearing clearance is too large; (2) uneven air gap; (3) the rotor unbalance; (4) shaft bending; (5) core deformation or loose; 6. Coupling (pulley) center is not correct; All landowners fan imbalance; Today casing or base strength is not enough; Pet-name ruby motor loose bolts; Attending open cage rotor welding circuit; Wound rotor circuit; The stator winding fault. 2. The troubleshooting (1) repair the bearing, if necessary, to replace; (2) adjust the air gap, and make it evenly; (3) correction of rotor dynamic balance; (4) straightening shaft; Calibration overlapping iron core (5), 6 to correction, to comply with the rules; All landowners overhaul fan, balance correction, correct its geometry shape; Today to reinforce; Pet-name ruby fastening bolts; Attending to repair the rotor winding; The repair of the stator winding. Nine, motor no-load current balance, but value is big 1. The cause of the problem (1) to repair, the stator winding turns to reduce too much; (2) power supply voltage is too high; (3) Y after motor misconnection Δ; (4) in the motor assembly, rotor installed backwards, making the stator core unaligned, effective length cut short; (5) the air gap is too large or uneven; 6 overhaul when the demolition of the old winding, using hot tear open method is undeserved, make the iron core loss. 2. The troubleshooting (1) rewind stator winding, restore the correct number diesel generating set of turns; (2) managed to restore rated voltage; (3) to connect to Y; (4) to assembly; (3) to replace the new rotor or adjust the air gap; (5) maintenance core or recalculate winding, appropriately increase the number of turns.

Brushless dc motor electrical engineer

In electrical engineer brushless dc motor and dc motor has the same working principle and application characteristics, and its composition is not the same. In addition to the motor itself, the former is more than a commutation circuit, the motor itself and the reversing circuit together. Many small power motor of motor itself is integrated with commutation circuit, look from the appearance of brushless dc motor and the dc motor are exactly the same. Brushless dc motor of the machine itself is electromechanical energy conversion part, it besides motor armature, permanent magnet excitation two points, also with sensors. Motor itself is the core of the brushless dc motor, it is not only related to the performance index, noise, vibration, reliability and service life, etc., involving the manufacturing costs and product cost. Because use permanent magnet magnetic field, make the brushless dc motor from the traditional design and structure of the dc motor commonly, meet the requirements of various applications market, and development in the direction of the province copper material saving, simple and convenient manufacturing. 

Permanent magnet magnetic field is closely related to the application of permanent magnetic material, the development of the third generation of the application of permanent magnetic material, make brushless dc motor to efficiency, miniaturization, energy-saving direction. In order to achieve the electronic commutation must have a position signal to control the circuit. Early with the mechanical and electrical position sensor position signal, has been gradually use electronic position sensor or other ways to get position signal, the easiest way is to use the armature winding voltage signals as position. To realize the control of motor speed must have a speed signal. With similar position signal obtained speed signal, the simplest speed sensor is type tachogenerator frequency measurement combined with electronic circuits. Brushless dc motor reversing circuit consists of two parts, drive and control, it is not easy to separate the two parts, especially small power circuit integration between the two usually become single application-specific integrated circuit. In the power of the larger motor, drive circuit and control circuit can become one. Drive circuit output power, drive motor armature winding, and controlled by the control circuit. The driver circuit has from the water pump linear amplification state into PWM switch state, the corresponding circuit composition also from transistor discrete circuit into modular integrated circuit. Modular integrated circuit with power bipolar transistors, power field effect tube and isolation gate field effect in the form of a bipolar transistor, etc. Although, isolation bipolar transistor gate field effect the price is more expensive, but from the perspective of the safe and reliable performance 8500w gasoline generator with it is more appropriate.