Mpanamboatra 10 hp vfd bldc any india
4. Increased temperature rise during motor operation
Under normal working conditions of various household single-phase motors, the surface temperature of the motor shell is generally about 20 ℃ higher than the ambient temperature, and the maximum temperature rise shall not be higher than 70 ℃. If the temperature of the shell surface rises sharply after the motor operates for several minutes, and the tar smell or even smoke is emitted in the motor, it is an overheating fault of the motor.
The main reasons for the motor overheating temperature rise are the quality problems of the motor itself; The motor is overloaded for a long time (the motor load is large due to the failure of the transmission mechanism); Poor heat dissipation condition of motor; Local short circuit of motor winding, etc. The most common one is winding turn to turn short circuit. The casing can be disassembled to check the winding. If the wire package is not burnt out, the stator can be re painted and insulated, and then dried. If the wire package is partially burnt out, only replace the winding wire package.
5. High motor running noise
There are generally two reasons for the high operating noise of the motor. One is the mechanical noise, which is mainly caused by the wear and oil shortage of the motor bearings, resulting in hard friction noise. Add grease after cleaning to reduce noise. When the rotor shaft and bearing are loose or the end cover is loose, the motor will also produce axial movement and noise during rotation. There are also some motors with poor assembly quality, the bearing chambers are not concentric, and the radial clearance of the motor is uneven, which will produce abnormal noise. For this, as long as the outer cover and the rear inner cover are removed, the rotor and stator seat are taken out, and the central shaft of the inner cover is riveted again.
In addition, some shaded pole motors have electromagnetic noise due to loose short-circuit ring or loose iron core, so clamping measures should be taken.
6. Fuselage overheating
1. motor overheating caused by power supply causes fault:
① . the power supply voltage is too high. When the power supply voltage is too high, the back EMF, magnetic flux and magnetic flux density of the motor will increase. As the iron loss is proportional to the square of the magnetic flux density, the iron loss increases, resulting in overheating of the core. The increase of magnetic flux leads to a sharp increase in the excitation current component, resulting in an increase in the copper loss of stator winding 1 and overheating of the winding. Therefore, when the power supply voltage exceeds the rated voltage of the motor, the motor will overheat.
② . the power supply voltage is too low. When the power supply voltage is too low, if the electromagnetic torque of the motor remains unchanged, the magnetic flux will decrease, the rotor current will increase correspondingly, and the load power component in the stator current will increase, resulting in increased copper loss of the winding, resulting in overheating of the stator and rotor windings.
Mpanamboatra 10 hp vfd bldc any india
③. Motor connection error. When the delta connection motor is wrongly connected into a star shape, the motor still operates with full load, the current flowing through the stator winding will exceed the rated current, and even cause the motor to stop automatically. If the shutdown time is a little longer and the power supply is not cut off, the winding will not only be seriously overheated, but also be burned out. When a star connected motor is wrongly connected into a triangle, or a motor with several coil groups in series forming one branch is wrongly connected into two branches in parallel, the winding and iron core will overheat, and the winding will be burned in serious cases.
4. motor connection error when one coil, coil group or one phase winding group is connected reversely, it will cause serious imbalance of three-phase current and overheat the winding.
7. Fahadisoana hafa
In the long-term operation of industrial motors, wear faults often occur due to stress: for example, the transmission torque of the reducer connector is large, and the transmission torque is unstable due to the wear of the connecting hole on the flange surface; Bearing wear caused by motor shaft bearing damage; Wear between shaft head and keyway, etc. After the occurrence of such problems, the traditional methods mainly focus on repair welding or machining repair after brush plating, but both of them have certain disadvantages: the thermal stress generated by repair welding at high temperature can not be completely eliminated, which is easy to cause material damage, bending or fracture of components; However, due to the limitation of coating thickness, brush plating is easy to peel off, and the above two methods use metal to repair metal, which cannot change the "hard to hard" coordination relationship, and will still cause re wear under the combined action of various forces. At present, the main method to repair metal with nonmetal is polymer composite. The material has super strong adhesion, excellent compressive strength and other comprehensive properties. The application of polymer composite materials for repair has no effect of repair welding thermal stress, and the repair thickness is not limited. At the same time, the metal materials of the product do not have the concession, which can absorb the impact vibration of the equipment, avoid the possibility of re wear, prolong the service life of equipment components, and save a lot of downtime for the enterprise, Create huge economic value.
Mpanamboatra 10 hp vfd bldc any india
MCC motor control center
Definition: motor control center is also called motor control center or motor control center, and its English name is motor control center, or MCC for short. The motor control center manages the power distribution and instrument equipment in a unified way. Various motor control units, feeder connector units, distribution transformers, lighting distribution boards, interlocking relays and metering equipment are installed in an integral enclosure and powered by a common enclosed bus.
In various fields of the national economy, such as electric power, petroleum, chemical industry, metallurgy, mining, papermaking, light industry, automobile, shipbuilding industry, transportation, municipal construction, food and beverage, water treatment, garbage treatment, pharmaceutical, etc., motors are more and more widely used. In order to make the motor run normally and reliably, it is necessary to control and protect the motor of a single motor and the motor of a production line.
Therefore, the level of MCC in motor control center has also developed rapidly. MCC refers to a complete set of motor control and protection equipment connected to AC low-voltage circuit, which is systematically assembled into standardized unit components according to certain specifications. Each component controls a motor of corresponding specifications, and the standard unit components are assembled into a cabinet to realize centralized control of multiple motors.
Working principle: working principle and existing problems of traditional MCC
The traditional MCC is connected to the remote DCS system in the MCC room by control cable and signal cable through hard wiring. The control command of DCS and the feedback information of MCC are transmitted by cable, and each cable is multiple (as shown in Figure 1 below). The traditional MCC control has the following problems:
① A large number of control and signal cables;
② Remote I, O cabinets are required on site;
⑨ Large wiring workload and long installation and commissioning cycle;
④ There are many connection points, so there are many fault points, and the cause of the accident is difficult to find;
⑤ When adding equipment circuits, control and signal cables must be laid again, which is not easy to expand:
⑥ There are few management and diagnostic information for production and operation, and the operation and maintenance of electrical equipment are poor;
⑦ There are a large number of spare parts, which are difficult to unify and occupy a large amount of funds.
Working principle and characteristics of intelligent MCC system
The intelligent MCC system is a new type of electrical automation control system combining information technology, sensing technology and computer data processing technology. Its core component is the motor intelligent protector with communication function. The control instructions of DCS and relevant operation information of motor are carried out through bus communication. Field buses such as lonwbrks, PROFIBUS, etllemet and TCP can be configured with standby communication interfaces as required. Its features are as follows:
① For cabinets without DCS field, usually each communication bus can control up to 100 motor circuits
② Few line contacts, strong anti-interference ability, clear fault causes, easy to find and eliminate;
③ Bus communication mode is adopted, with short installation and commissioning cycle;
④ When adding equipment circuit, if the system allows, it only needs to be set in the software, which is convenient and flexible to expand;
⑤ The operation management information is rich, which can provide detailed equipment maintenance information, achieve preventive maintenance of equipment, and minimize the downtime due to unexpected equipment failure:
⑥ With spare parts management function, the number of spare parts is small, which can reduce the capital occupation.
Mpanamboatra 10 hp vfd bldc any india
Mba hahatonga ny maotera toka-dingana mihodina ho azy, dia afaka manampy ny fanombohana miolikolika ao amin'ny stator. Ny fahasamihafan'ny habaka eo amin'ny fihodinkodinana manomboka sy ny fihodinana lehibe dia 90 degre. Ny fanombohana winding dia tokony hifandray amin'ny capacitor mety amin'ny andian-dahatsoratra, ka ny fahasamihafan'ny dingana eo amin'ny ankehitriny sy ny lehibe winding dia tokony ho 90 degre, izany hoe, ilay antsoina hoe dingana fisarahana fitsipika. Amin'izany fomba izany, ny tondra-drano roa miaraka amin'ny fahasamihafan'ny fotoana 90 degre dia mifandray amin'ny fihodinana roa miaraka amin'ny fahasamihafan'ny habaka 90 degre, izay hiteraka sahan'andriamby mihodinkodina (dingana roa) eny amin'ny habakabaka. Eo ambanin'ny hetsika an'ity sahan'andriamby mihodinkodina ity dia afaka manomboka mandeha ho azy ny rotor. Aorian'ny fanombohana, rehefa miakatra amin'ny ambaratonga iray ny hafainganam-pandeha, dia tapaka amin'ny alàlan'ny fanampian'ny switch centrifugal na fitaovana fanaraha-maso mandeha ho azy hafa ao amin'ny rotor ny fihodinkodinana voalohany, ary ny fihodinana lehibe ihany no miasa mandritra ny fandidiana mahazatra. Noho izany, ny fanombohana winding dia azo atao amin'ny fomba fiasa fohy. Na izany aza, amin'ny toe-javatra maro, ny fiodinana fanombohana dia tsy misokatra tsy tapaka. Ity motera ity dia antsoina hoe motera tokana. Mba hanovana ny lalan'ity môtô ity dia ovay fotsiny ny terminal amin'ny fanodinkodinana fanampiny.
Ao amin'ny maotera tokana, ny fomba iray hafa hamokarana saha andriamby mihodinkodina dia antsoina hoe fomba pole shaded, fantatra ihany koa amin'ny motera tsato-kazo tokana. Ny stator amin'ity karazana motera ity dia vita amin'ny karazana tsato-kazo misongadina, izay misy andry roa sy tsato-kazo efatra. Ny tsato-kazo andriamby tsirairay dia omena slot kely eo amin'ny 1/3--1/4 feno bao ambonin'ny, izay mizara ny andriamby tsato-kazo roa, ary fohy-circuit peratra varahina dia tanany amin'ny ampahany kely, toy ny hoe ity ampahany ity. ny andriamby tsato-kazo dia rakotra, ka izany no antsoina hoe rakotra pole maotera. Ny fihodinkodinana amin'ny dingana tokana dia apetaka eo amin'ny tsato-kazo andriamby iray manontolo, ary mifamatotra amin'ny andiany ny coils amin'ny tsato-kazo tsirairay. Rehefa mampifandray dia tsy maintsy alamina amin'ny N, s, N ary s ny polarity vokarina. Rehefa mihodinkodina ny stator dia mipoitra ao amin'ny tsato-kazo andriamby ny flux andriamby lehibe. Araka ny lalànan'i Lenz, ny flux andriamby lehibe mandalo amin'ny peratra varahina short-circuit dia miteraka kojakoja ao amin'ny peratra varahina izay miala 90 degre amin'ny dingana. Ny flux magnetika aterak'io kojakoja io koa dia mijanona ao ambadiky ny flux magnetika lehibe amin'ny dingana. Ny asany dia mitovy amin'ny an'ny fanombohan'ny maotera capacitive, ka miteraka sahan'andriamby mihodinkodina mba hampihodina ny motera.
Motor telo phase
Ny maotera telo dingana dia midika fa rehefa mifamatotra amin'ny AC telo-dingana ny fihodinan'ny stator telo amin'ny motera (samy manana zoro elektrika 120 degre), dia hisy saha andriamby mihodina. Ny sahan'andriamby mihodinkodina dia hanapaka ny fihodin'ny rotor ary hiteraka rivo-doza ao amin'ny fihodinan'ny rotor (lalana mihidy ny fihodinan'ny rotor). Ny mpitondra rotor mitondra amin'izao fotoana izao dia hiteraka hery elektromagnetika eo ambanin'ny fihetsiky ny sahan'andriamby miodina stator, mba hamoronana torque elektromagnetika eo amin'ny tadin'ny maotera ary handroaka ny maotera hihodina, ary mitovy amin'ny an'ny motera ny fihodinan'ny motera. sahan'andriamby mihodinkodina.
Mpanamboatra 10 hp vfd bldc any india
Performance: ys series three-phase motors are designed and manufactured according to national standards. They are characterized by high efficiency, energy saving, low noise, small vibration, long service life, convenient maintenance, large starting torque, etc. they are class B insulation, IP44 shell protection, ic411 cooling mode, 380V rated voltage and 50Hz rated frequency. They are widely used in food machinery, fans and various mechanical equipment. The executive standard is jb/t1009-2007 totally enclosed motor system with external fan cooling and squirrel cage structure. The utility model has the characteristics of novel design, beautiful appearance, low noise, high efficiency, high torque, good starting performance, compact structure, convenient use and maintenance, etc. The whole machine adopts class F insulation and is designed according to the insulation structure evaluation method of international practice, which greatly improves the safety and reliability of the whole machine. It has reached the advanced level of similar foreign products in the early 1990s. Y2 series motors can be widely used in machine tools, fans, water pumps, compressors, transportation, agriculture, food processing and other mechanical transmission equipment.
Fomba fandrefesana: misy maodely braking elektrika telo ho an'ny motera induction induction telo: ny fanjifàna angovo, ny famerenam-bola ary ny famerenan'ny fanavaozana.
(1) Nandritra ny fanjifana angovo braking, tapaho ny telo-dingana AC hery famatsiana ny maotera ary mandefa ny DC hery ho amin'ny stator miolikolika. Amin'ny fotoana hanapahana ny famatsiana herinaratra AC, noho ny tsy fahampian-tsakafo, ny motera dia mbola mihodina amin'ny lalana tany am-boalohany, ary ny herin'ny electromotive induced sy ny induced current dia miteraka ao amin'ny conductor rotor. Ny courant induced dia miteraka torque, izay mifanohitra amin'ny torque novokarin'ny sahan'andriamby raikitra miforona aorian'ny famahanana ny courant mivantana. Noho izany, ny maotera mijanona mihodina haingana mba hahatratrarana ny tanjon'ny frein. Ity fomba ity dia miavaka amin'ny stable braking, fa ny famatsiana herinaratra DC sy ny maotera mahery vaika dia ilaina, ny vidin'ny fitaovana DC dia lehibe, ary ny hery braking dia kely amin'ny hafainganam-pandeha ambany.
(2) Reverse braking dia mizara ho enta-mavesatra mivadika braking sy hery mivadika frein.
1) Load reverse braking dia antsoina koa hoe load reverse braking. Rehefa mihodina amin'ny lalana mifanohitra amin'ny sahan'andriamby mihodinkodina eo ambanin'ny asan'ny zavatra mavesatra ny rotor ny motera (rehefa mampiasa ny motera ny vano mba hampidina ilay zavatra mavesatra), ny torsi elektromagnetika vokarina amin'izao fotoana izao dia ny torque braking. Io torque io dia mahatonga ny lanja hidina moramora amin'ny tahan'ny tsy miovaova. Ny toetra mampiavaka an'io karazana braking io dia: ny famatsiana herinaratra dia tsy mila fifandraisana mifamadika, tsy ilaina ny fitaovana fandrefesana manokana, ary azo amboarina ny hafainganam-pandehan'ny frein, saingy azo ampiharina amin'ny motera ratra. Tsy maintsy ampifandraisina amin'ny andian-dahatsoratra misy fanoherana lehibe ny fihodinan'ny rotor mba hahatonga ny slip mihoatra ny 1.
2) Hery mifamadika ny fifandraisana frein rehefa ny maotera mila frein, raha ny roa-dingana herinaratra tsipika dia ahitsy amin'ny fomba tsy ara-drariny mba hahatonga ny fihodinan'ny sahan'andriamby mifanohitra, dia afaka frein haingana. Rehefa mitovy amin'ny aotra ny hafainganam-pandehan'ny maotera, tapaho avy hatrany ny famatsiana herinaratra. Ity karazana braking ity dia miavaka amin'ny fiantsonan'ny fiara haingana, ny herin'ny braking matanjaka ary tsy mila fitaovana fijanonana. Na izany aza, noho ny hery lehibe amin'izao fotoana izao sy ny fiatraikany mandritra ny frein, dia mora ny manafana ny motera na manimba ny ampahany amin'ny ampahany.
