Dab tsi ua rau Synchronous Tsav Los Poob Synchronism?

Ib tug yam ntxwv tseem ceeb ntawm asynchronous lub cev muaj zogyog tias nws rotor ceev yog synchronized nrog stator rotating magnetic teb. Thaum lub rotor ceev deviates los ntawm synchronous ceev thiab tsis tuaj yeem rov qab tau,poob ntawm synchronismtshwm sim, uas yuav ua rau muaj kev vibration, overload, los yog puas tsuaj rau lub cev muaj zog. Qhov ua rau muaj kev nyuaj thiab tuaj yeem muab faib ua tsib pawg tseem ceeb: kev cuam tshuam ntawm kev thauj khoom, kev siv hluav taws xob tsis zoo, kev ua haujlwm tsis zoo, kev cuam tshuam sab nraud, thiab lub cev muaj zog. Nyob rau hauv qhov tseeb, lawv tag nrho cov tawgdynamic tshuav ntawm electromagnetic torque thiab load torque, los yog destabilize lub stator rotating magnetic teb.

1. Sudden Nce lossis Sustained Overload ntawm Load Torque

Lub tshuab synchronous muaj ibsiab tshaj synchronous torquetxwv. Thaum load torque nce sharply (xws li mechanical jamming los yog shock loading) los yog lub cev muaj zog ua hauj lwm nyob rau hauv ntev - lub sij hawm overload, thiab load torque tshaj lub siab tshaj plaws synchronous torque, electromagnetic torque yuav tsis muaj synchronization. Lub rotor qeeb qeeb, deviates los ntawm synchronous ceev, thiab poob synchronism. Piv txwv li, asynchronous lub cev muaj zogtsav tsheb dov zeb tuaj yeem yooj yim poob synchronism yog tias load dheev nce vim cov khoom tsis sib xws.

2. Lub zog hluav taws xob hloov pauv lossis qhov tsis sib xws

Lub zog ruaj khov ncaj qha cuam tshuam rau stator magnetic teb thiab electromagnetic torque.

Kev poob qis hauv qhov hluav taws xob tsis muaj zog hauv stator teb. Txij li thaum electromagnetic torque yog proportional rau lubsquare ntawm voltage, qis voltage drastically txo torque thiab ua rau poob ntawm synchronism.

Deviation nyob rau hauv zaus hloov lub synchronous ceev (n₁=60f/p). Lub rotor inertia tsis tuaj yeem ua raws li kev hloov pauv sai, ua rau kev sib txawv ntawm qhov nrawm thiab qhov tshwm sim poob ntawm synchronism.

Asymmetrical peb-theem fais fab (theem poob, tsis muaj qhov sib npaug) tsim cov hlau nplaum sib nqus thiab ua kom tsis muaj zog, uas tuaj yeem ua rau poob ntawm synchronism.

3. Excitation System Failure

Lub excitation system generates lub rotor magnetic teb thiab ncaj qha txiav txim electromagnetic torque. Feem ntau tsis ua haujlwm muaj xws li:

Sudden poob los yog cuam tshuam ntawm excitation tam sim no

Malfunction ntawm excitation regulator

Txo excitation tam sim no tsis muaj zog lub rotor teb thiab rub torque. Yog hais tias excitation ploj lawm, electromagnetic torque poob mus rau xoom, thiab lub rotor sai sai, uas ua rau poob ntawm synchronism loj heev. Piv txwv li, luv luv Circuit Court nyob rau hauv lub excitation Circuit Court ntawm ib tug loj synchronous generator yuav ua rau tam sim ntawd poob ntawm excitation, daim phiaj fluctuation, thiab lub cev muaj zog tawm - ntawm - kauj ruam ua hauj lwm.

4. Kev cuam tshuam sab nraud thiab kev poob siab

Cov kev cuam tshuam ntawm daim phiaj (luv luv luv, xob laim overvoltage, voltage shocks los ntawm cov khoom loj pib / nres) destabilize lub hwj chim mov thiab stator teb.Mechanical shocks (loo coupling, dheev load braking, foundation vibration) ua instantaneous ceev fluctuations. Yog hais tias qhov cuam tshuam zaus mus txog lub cev muaj zog lub ntuj oscillation zaus,resonancetuaj yeem tshwm sim, ua rau qhov sib txawv nrawm thiab ua rau poob ntawm synchronism.

5. Cov qauv thiab Parameter tsis zoo ntawm lub cev muaj zog

Kev tsim, tsim khoom, lossis kev saib xyuas teeb meem tuaj yeem ua rau poob ntawm synchronism:

Tig-rau-tig luv luv Circuit Court lossis grounding faults nyob rau hauv stator/rotor windings tsim tsis sib xws magnetic teb thiab ntxiv cuam tshuam torques.

Tsis sib xws huab cua sib txawv (stator eccentricity, khoov rotor) ua rau lub zog ripple thiab tsis ruaj khov ceev.

Hnav bearings lossis lubrication tsis zoo ua rau cov neeg kho tshuab tsis kam, uas tuaj yeem ua rau lub zog sib npaug.

Tsawg lub sij hawm ntawm inertia txo lub rotor lub peev xwm los tiv thaiv kev cuam tshuam ceev, ua rau poob ntawm synchronism ntau dua.

Xaus

Poob ntawm synchronism hauv asynchronous lub cev muaj zogtshwm sim los ntawm ob qho tib si sib xyaw ua ke lossis ib qho tseem ceeb tshaj qhov nws txwv. Hauv kev xyaum, kev poob ntawm synchronism tuaj yeem tiv thaiv tau los ntawm kev txhim kho kev tswj hwm kev tswj hwm, txhim kho lub zog zoo, ntxiv dag zog rau kev saib xyuas lub cev, thiab txhim kho kev saib xyuas lub cev muaj zog, yog li ua kom muaj kev nyab xeeb thiab ruaj khov.