Ob peb ua rau Torque Ripple hauv Brushless DC Tsav

1. Torque ripple tshwm sim los ntawm electromagnetic yam

Qhov no yog lub torque ripple tsim los ntawm kev sib cuam tshuam ntawm stator tam sim no thiab rotor magnetic teb. Nws muaj feem cuam tshuam ncaj qha rau kev faib tawm tam sim no waveform, induced electromotive force waveform, thiab air gap magnetic flux density. Vim yog tsim thiab tsim khoom. Nws yog ib qho nyuaj rau khaws cov induced electromotive quab yuam raws li ib tug trapezoidal yoj, los yog lub tiaj tus sab saum toj dav tsis yog 120 ° hluav taws xob lub kaum sab xis; los yog induced electromotive quab yuam thiab tam sim no tsis tuaj yeem nruj me ntsis synchronized vim qhov tsis txaus ntawm rotor txoj haujlwm nrhiav kom pom thiab tswj qhov system; los yog tam sim no waveform deviates los ntawm lub square nthwv dej thiab tsuas yog approximated Lub av hloov raws li lub trapezoidal yoj thiab thiaj li nyob. Lub hav zoov ntawm cov xwm txheej no yuav ua rau lub cim ntawm electromagnetic torque ripple. Cov txheej txheem los tiv thaiv torque ripple tshwm sim los ntawm cov khoom siv hluav taws xob muaj xws li kev tsim qauv tsim kom zoo, txoj kev qhib lub kaum sab xis, txoj kev sib haum xeeb tshem tawm, txoj kev tawm tswv yim torque, thiab lwm yam.

2. Torque ripple tshwm sim los ntawm kev sib hloov tam sim no

Thaum DC brushless lub cev muaj zog ua haujlwm. Lub stator windings commutate nyob rau hauv ib qho kev txiav txim. Vim yog qhov inductance ntawm txhua theem winding. Obstruct qhov tam sim no hloov tam sim no. Txhua lub sijhawm dhau los ntawm lub xeev sib nqus, qhov tam sim no hauv armature winding yuav ua rau electromagnetic torque pulsation thaum hloov ntawm ib theem mus rau lwm theem. Cov txheej txheem los tiv thaiv torque ripple tshwm sim los ntawm kev sib hloov tam sim no suav nrog txoj kev tawm tswv yim tam sim no, hysteresis txoj kev tam sim no, txoj kev sib tshooj commutation, pulse width modulation (PwM) chopping method thiab lwm yam.

3. Torque ripple tshwm sim los ntawm cogging

Txhawm rau tso cov stator windings, cov tub ntxhais stator ntawm lub tshuab tsis txhuam DC yuav tsum muaj cov hniav thiab cog. Vim tias muaj cov stator cogging, qhov sib txawv ntawm cov huab cua tsis sib xws, thiab cov hlau nplaum sib nqus hauv cov hniav yog qhov tseem ceeb ntawm cov hniav. Ua kom huab cua sib txawv permeability tsis tas li. Thaum lub rotor tig. Cov huab cua sib nqus magnetic teb yog yuav hloov, tsim cogging torque. Lub cogging torque muaj feem xyuam rau txoj hauj lwm ntawm lub rotor, uas ua rau torque pulsation. Qhov ua rau cogging torque txawv ntawm ob qho lus hais saum toj no ua rau torque ripple. Ob qho uas tau hais los saum no ntawm lub zog torque ripple yog tshwm sim los ntawm kev cuam tshuam ntawm stator tam sim no thiab rotor magnetic teb, thiab lub sijhawm cogging yog tsim los ntawm kev sib cuam tshuam ntawm stator core thiab rotor magnetic teb. Txoj hauv kev zoo tshaj plaws los txo cov cog torque ripple yog stator skew. Los yog oblique ncej ntawm lub rotor.

4. Torque pulsation tshwm sim los ntawm armature cov tshuaj tiv thaiv

Lub zog ntawm armature magnetomotive quab yuam ntawm lub ntsiab magnetic teb ntawm huab cua sib txawv. Nws yog hu ua armature cov tshuaj tiv thaiv. Cov tshuaj tiv thaiv armature ntawm brushless DC lub cev muaj zog yog qhov nyuaj dua. Raws li qhov xwm txheej ntawm cov tshuaj tiv thaiv armature, lub zog magnetomotive ntawm cov tshuaj tiv thaiv armature tuaj yeem decomposed mus rau hauv ib qho quadrature axis tivthaiv thiab ib tug ncaj axis tivthaiv. Lub direct-axis armature reacts rau lub magnetomotive quab yuam demagnetize lub ntsiab magnetic teb ua ntej thiab ces nce lub magnetization thaum lub sij hawm tig ntawm lub rotor, thiaj li hais tias tag nrho cov sib nqus flux ntawm txhua ncej ntawm lub load hloov nyob rau hauv lub cheeb tsam ntawm tag nrho cov magnetic flux. ntawm txhua tus ncej ntawm lub load. Nyob rau hauv txoj kev no, induced electromotive quab yuam thiab electromagnetic torque kuj yuav hloov, tab sis cov nyhuv tsis loj. Lub permeability ntawm cov khoom sib nqus mus tas li yog nyob ze rau ntawm cov huab cua, uas ua rau cov hlau nplaum tiv thaiv ntawm lub quadrature armature cov tshuaj tiv thaiv magnetic circuit ze heev. Loj, lub magnetic flux reacted los ntawm lub quadrature armature yog heev me me. Nws cuam tshuam rau lub ntsiab magnetic teb ntawm huab cua sib txawv yog negligible.