Vidin'ny motera 16 valve amin'ny dynamo pakistan ho an'ny famokarana herinaratra
Single phase motor capacitance:
(1) Withstand voltage greater than 220v*1.41 ＝ 310V, 400V
(2) Electrodeless capacitor shall be selected for polarity
(3) Capacitor capacity / rated power ＝ 10nf/100w
If your motor power is 370w*10nf/100w=37nf
Three phase asynchronous motor is a kind of motor powered by 380V three-phase AC power supply (phase difference of 120 °). Because the rotor and stator rotating magnetic field of three-phase asynchronous motor rotate in the same direction and at different speeds, there is slip, so it is called three-phase asynchronous motor.
fitsipika miasa
There are many forms of motor, but its working principle is based on the law of electromagnetic induction and the law of electromagnetic force. Therefore, the general principle of its structure is to use appropriate magnetic and conductive materials to form a magnetic circuit and circuit for mutual electromagnetic induction, so as to generate electromagnetic power and achieve the purpose of energy conversion.
The three-phase asynchronous motor is an induction motor. After the stator is supplied with current, part of the magnetic flux passes through the short-circuit ring and generates induced current. The current in the short-circuit ring hinders the change of magnetic flux, resulting in a phase difference between the magnetic flux generated by the part with and without the short-circuit ring, thus forming a rotating magnetic field. After power on and start-up, the rotor winding induces electromotive force and current due to the relative movement between the rotor winding and the magnetic field, that is, the rotating magnetic field has a relative speed with the rotor, and interacts with the magnetic field to generate electromagnetic torque, which makes the rotor rotate and realizes energy conversion.
Fanasokajiana motera
1. classification by working power supply
Araka ny famatsiana herinaratra miasa samihafa amin'ny motera, dia azo zaraina ho maotera DC sy motera AC. Ny motera AC dia mizara ho motera tokana sy motera telo.
2. classification according to structure and working principle
According to the different structure and working principle of the motor, it can be divided into DC motor, asynchronous motor and synchronous motor.
Synchronous motor can also be divided into permanent magnet synchronous motor, reluctance synchronous motor and hysteresis synchronous motor.
Asynchronous motor can be divided into induction motor and AC commutator motor. Induction motor is divided into three-phase asynchronous motor, single-phase asynchronous motor and shaded pole asynchronous motor. AC commutator motor is divided into single-phase series excitation motor, AC / DC dual-purpose motor and repulsion motor.
According to the structure and working principle, DC motor can be divided into brushless DC motor and brush DC motor. Brush DC motor can be divided into permanent magnet DC motor and electromagnetic DC motor. Electromagnetic DC motor is divided into series excited DC motor, parallel excited DC motor, separately excited DC motor and compound excited DC motor. Permanent magnet DC motor is divided into rare earth permanent magnet DC motor, ferrite permanent magnet DC motor and aluminum nickel cobalt permanent magnet DC motor.
3. classification by startup and operation mode
According to the different starting and operating modes of the motor, it can be divided into capacitor starting single-phase asynchronous motor, capacitor operating single-phase asynchronous motor, capacitor starting operating single-phase asynchronous motor and split phase single-phase asynchronous motor.
Vidin'ny motera 16 valve amin'ny dynamo pakistan ho an'ny famokarana herinaratra
4. classification by use
Azo zaraina ho maotera fiara sy motera fanaraha-maso.
Ny motera ho an'ny fiara dia mizara ho motera ho an'ny fitaovana elektrika (anisan'izany ny fandavahana, ny famolahana, ny famolahana, ny slotting, ny fanapahana, ny reaming ary ny fitaovana hafa) Motors ho an'ny kojakoja ao an-tokantrano (anisan'izany ny milina fanasan-damba, ny mpankafy elektrika, ny vata fampangatsiahana, ny fanamafisam-peo, ny kasety, ny firaketana horonantsary, Mpilalao DVD, mpanadio banga, fakan-tsary, fanamainana volo, shaver elektrika, sns.) ary motera ho an'ny fitaovana mekanika kely amin'ny ankapobeny (anisan'izany ny fitaovana milina kely isan-karazany, milina kely, fitaovana fitsaboana, fitaovana elektronika, sns.).
Ny motera fanaraha-maso dia mizara ho motera manitsaka sy motera servo.
5. classification according to rotor structure
According to the structure of the rotor, the motor can be divided into cage induction motor (called squirrel cage induction motor in the old standard) and wound rotor induction motor (called wound rotor induction motor in the old standard).
6. classification by running speed
Araka ny hafainganam-pandehan'ny môtô, dia azo zaraina ho maotera haingam-pandeha, maotera ambany hafainganam-pandeha, maotera hafainganam-pandeha tsy tapaka ary motera mifehy ny hafainganam-pandeha.
Ny motera haingam-pandeha ambany dia mizara ho motera fampihenana fitaovam-piadiana, motera fampihenana elektromagnetika, motera torque ary motera synchronous claw pole.
Ho fanampin'ny maotera haingam-pandeha tsy tapaka, motera haingam-pandeha tsy tapaka, motera hafainganam-pandeha miovaova ary motera hafainganam-pandeha tsy miova, ny maotera hafainganam-pandeha miovaova dia azo zaraina koa amin'ny maotera hafainganam-pandehan'ny elektromagnetika, motera hafainganam-pandeha DC, motera hafainganam-pandeha miovaova PWM ary nivadika fisalasalana miovaova hafainganam-pandeha maotera.
Ny hafainganam-pandehan'ny motera asynchronous dia ambany kely noho ny hafainganam-pandehan'ny sahan'andriamby mihodina.
Ny hafainganam-pandehan'ny motera synchronous dia tazonina amin'ny hafainganam-pandeha synchronous foana na inona na inona enta-mavesatra.
Fizotry ny asa fototra:
(1) Rehefa ny telo-dingana asynchronous maotera mifandray amin'ny telo-dingana AC hery famatsiana (samy manana fahasamihafana ny 120 degre), ny telo-dingana stator winding mikoriana amin'ny alalan'ny telo-dingana magnetomotive hery (stator rotating magnetomotive hery) novokarin'ny courant symmetrical dingana telo ary miteraka saha andriamby mihodina, izay mihodina manaraka ny fihodin'ny famantaranandro manaraka ny habaka boribory anatiny amin'ny stator sy rotor amin'ny hafainganam-pandeha N0 synchronous.
(2) The rotating magnetic field has relative cutting motion with the rotor conductor. According to the principle of electromagnetic induction, the rotor conductor (the rotor winding is a closed path) generates induced electromotive force and induced current (the direction of induced electromotive force is determined by the right-hand rule).
(3) According to the law of electromagnetic force, under the action of the induced electromotive force, the rotor conductor will produce an induced current basically consistent with the direction of the induced electromotive force. The current carrying rotor conductor is affected by the electromagnetic force in the magnetic field generated by the stator (the direction of the force is determined by the left-hand rule). The electromagnetic force forms an electromagnetic torque on the motor rotor shaft, driving the motor rotor to rotate along the direction of the rotating magnetic field. When the motor shaft is loaded with mechanical load, it will output mechanical energy outward. Since the magnetic flux of the part without short-circuit ring is ahead of that of the part with short-circuit ring, the rotation direction of the motor is the same as that of the rotating magnetic field.
Vidin'ny motera 16 valve amin'ny dynamo pakistan ho an'ny famokarana herinaratra
Why asynchronous motor
Because the induced current in the rotor coil of three-phase asynchronous motor is generated due to the relative movement between the rotor conductor and the magnetic field. The rotor speed of the three-phase asynchronous motor will not be synchronized with the rotating magnetic field, nor will it exceed the speed of the rotating magnetic field. If the rotating speed of the rotor of the three-phase asynchronous motor is equal to the rotating speed of the rotating magnetic field, there will be no relative movement between the magnetic field and the rotor, and the conductor cannot cut the magnetic line of force, so the induced electromotive force and current will not be generated in the rotor coil, and the rotor conductor of the three-phase asynchronous motor will not be affected by the electromagnetic force in the magnetic field to make the rotor rotate. Therefore, the rotor rotation speed of three-phase asynchronous motor cannot be the same as that of the rotating magnetic field, and is always less than the synchronous speed of the rotating magnetic field. However, under special operation mode (such as power generation braking), the rotor speed of three-phase asynchronous motor can be greater than the synchronous speed.
Three phase asynchronous motor torque
Symmetrical 3-phase winding is connected with symmetrical 3-phase current to generate rotating magnetic field. The magnetic field wire cuts the rotor winding. According to the principle of electromagnetic induction, e and I are generated in the rotor winding. The rotor winding is affected by electromagnetic force in the magnetic field, that is, electromagnetic torque is generated to make the rotor rotate. The rotor outputs mechanical energy and drives the mechanical load to rotate.
In AC motor, when the stator winding passes through AC current, the armature magnetomotive force is established, which has a great impact on the energy conversion and operation performance of the motor. Therefore, three-phase AC winding is connected with three-phase AC to generate pulsating magnetomotive force, which can be decomposed into two rotating magnetomotive forces with equal amplitude and opposite speed, so as to establish forward and reverse magnetic fields in the air gap. These two rotating magnetic fields cut the rotor conductor and generate induced electromotive force and induced current in the rotor conductor respectively.
The current interacts with the magnetic field to produce positive and negative electromagnetic torque. The forward electromagnetic torque attempts to make the rotor rotate forward; The reverse electromagnetic torque attempts to reverse the rotor. The superposition of these two torques is the synthetic torque that drives the motor to rotate.
Vidin'ny motera 16 valve amin'ny dynamo pakistan ho an'ny famokarana herinaratra
Three phase asynchronous motor speed
Three alternating currents are connected to the stator of the motor to generate a rotating magnetic field at a speed of N0. Different pole pairs P, under the action of AC with the same frequency f=50hz, will produce different synchronous speeds N0, n0=60f/p.
Ny hafainganam-pandehan'ny rotor maotera dia kely noho ny an'ny sahan'andriamby mihodina, izay mitovy amin'ny an'ny motera induction. s=(ns-n)/ns. S dia ny tahan'ny slip,
Ny NS dia ny hafainganam-pandehan'ny sahan'andriamby ary ny N ny hafainganam-pandehan'ny rotor.
Type of three-phase asynchronous motor
Araka ny rafitra rotor samy hafa, telo-dingana asynchronous motera azo zaraina ho cage karazana sy ny ratra karazana.
Cage rotor asynchronous maotera no be mpampiasa noho ny rafitra tsotra, azo antoka ny asa, maivana lanja sy ny vidiny ambany. Ny tena fatiantoka dia ny fahasarotan'ny fanaraha-maso ny hafainganam-pandeha.
The rotor and stator of wound three-phase asynchronous motor are also equipped with three-phase windings and connected with external rheostat through slip ring and brush. Adjusting the rheostat resistance can improve the starting performance of the motor and adjust the speed of the motor.
Three phase asynchronous motor features:
Tombontsoa: raha ampitahaina amin'ny motera asynchronous dingana tokana, motera asynchronous telo-dingana dia manana tombony amin'ny rafitra tsotra, fanamboarana mora, fampandehanana tsara, mitahiry fitaovana isan-karazany ary vidiny ambany.
Ny tsy fahampiana: lagging power factor, low light load power factor and poor speed regulation performance.
Use of three-phase asynchronous motor
The power of three-phase asynchronous motor is large, and it is mainly made into large motor. It is generally used in large industrial equipment with triple phase power. First of all, the three-phase asynchronous motor is only used as a motor, rarely as a generator, and all synchronous motors are used for power generation.
For the small power three-phase asynchronous motor below 1kW, it can not only operate three-phase, but also operate single-phase.
Classification of DC motors
Ny fomba fientanentanana an'ny motera DC dia manondro ny olana amin'ny fomba famatsiana herinaratra amin'ny fihodinkodinana fientanam-po ary miteraka flux magnetika fientanam-po mba hametrahana ny saha magnetika lehibe. Araka ny fomba fientanentanana samihafa, ny motera DC dia azo zaraina amin'ireto karazana manaraka ireto.
Excitation mode of DC motor
1. misaraka mientanentana DC maotera
Tsy mifandray amin'ny fiodinan'ny fitaovam-piadiana ny fihodinkodinana, fa ny motera DC omen'ny famatsiana herinaratra DC hafa amin'ny fihodinkodinana fientanam-po dia antsoina hoe motera DC mientanentana misaraka, ary ny tariby dia aseho amin'ny sary (a). Ao amin'ny sary, ny M dia maneho ny motera, ary raha mpamokatra izy dia G dia maneho azy. Ny maotera DC andriamby maharitra dia azo raisina ho motera DC mitokana.
2. Shunt DC maotera
Ny fihodinkodinana sy ny fiodinan'ny motera Shunt DC dia mifamatotra amin'ny parallèle, ary ny tariby dia aseho amin'ny sary (b). Amin'ny maha-mpamokatra shunt excitation, ny voltase terminal avy amin'ny motera mihitsy no manome hery ny fihodinkodinana; Amin'ny maha-motera shunt, ny fihodinkodinana sy ny fitaovam-piadiana dia mitovy famatsiana herinaratra, izay mitovy amin'ny an'ny motera DC mitokana mitokana amin'ny lafiny fampisehoana.
3. andian-dahatsoratra mientanentana DC maotera
Ny fihodinkodinana fientanam-po an'ny motera DC mientanentana dia mifandray amin'ny fihodin'ny armature, ary avy eo mifandray amin'ny famatsiana herinaratra DC. Ny wiring dia aseho amin'ny sary (c). Ny courant excitation an'ity motera DC ity dia ny cour armature.
Vidin'ny motera 16 valve amin'ny dynamo pakistan ho an'ny famokarana herinaratra
4. môtô DC mifangaro
Ny motera DC excitation dia manana fihodin-drivotra roa, fientanam-po parallèle ary fientanam-po an-tsarimihetsika, ary ny tariby dia aseho amin'ny sary (d). Raha ny flux andriamby novokarin'ny andian-dahatsoratra excitation winding sy ny parallèle excitation winding dia mitovy tari-dalana, dia antsoina hoe cumulative fitambarana excitation. Raha mifanipaka lalana ny flux andriamby roa, dia antsoina hoe excitation compound differential izany.
Ny motera DC miaraka amin'ny fomba fientanam-po samihafa dia manana toetra samihafa. Amin'ny ankapobeny, ny maodely fientanam-po lehibe amin'ny motera DC dia ny fientanam-po mifanitsy, ny fientanentanana andiany ary ny fientanam-po mitambatra. Ny fomba fientanentanana lehibe amin'ny mpamokatra DC dia ny fientanam-po misaraka, ny fientanam-po parallèle ary ny fientanam-po.
Characteristics of DC motor
（1） Good speed regulation performance. The so-called "speed regulation performance" refers to that the speed of the motor is artificially changed according to the needs under certain load conditions. DC motor can realize even and smooth stepless speed regulation under heavy load, and the speed regulation range is wide.
（2） Large starting torque. Speed regulation can be realized uniformly and economically. Therefore, all machinery that starts under heavy load or requires uniform speed adjustment, such as large reversible steel rolling mill, winch, electric locomotive, tram, etc., are driven by DC motor.
Working principle of DC motor
Working principle of DC motor
Ny foto-kevitry ny "ny hery miasa amin'ny conducteur mahery ao amin'ny sahan'andriamby" dia ampiharina amin'ny ankapobeny. Ny tariby roa farany amin'ny coil excitation dia manana courant mitovy amin'ny lalana mifanohitra, izay mahatonga ny coil iray manontolo hamokatra ny torsion manodidina ny shaft ary mampihodina ny coil.
To make the armature receive an electromagnetic torque with the same direction, the key lies in how to change the direction of the current flowing through the coil in time when the coil side is under the magnetic poles of different polarity, that is, the so-called "commutation". Therefore, a device called commutator must be added. The commutator and brush can ensure that the current in the coil side under each pole is always in the same direction, so that the motor can rotate continuously. This is the working principle of DC motor.
