Permanent Magnet Tsav: Cov tsos mob tshwj xeeb tom qab Demagnetization

Tom qab amus tas li hlau nplaum lub cev muaj zogpoob hlau nplaum (suav nrog ib nrab thiab tag nrho demagnetization), nws cov yam ntxwv tseem ceeb yog qhov poob qis hauv electromagnetic hloov dua siab tshiab, ua rau cov saw ntawm kev ua tau zoo thiab kev ua haujlwm tsis zoo.

Nyob rau hauv cov nqe lus ntawm cov zis kev ua tau zoo, load peev xwm poob sharply; input tam sim no nce ho nyob rau hauv tib lub load, thiab lub cev muaj zog yooj yim poob synchronism los yog stalls nyob rau hauv hnyav load. Qhov pib tam sim no tuaj yeem ncav cuag 2-3 npaug ntawm qhov ntsuas tus nqi tseem tsis tau pib zoo. Nyob rau hauv cov ntaub ntawv ntawm ib feem ntawm demagnetization, torque ripple ua hnyav, ua haujlwm du tsis yooj yim sua.

Cov teeb liab hluav taws xob qhia qhov tsis txaus ntseeg: peb-theem tam sim no tsis txaus siab tshaj 10%, tsis muaj kev thauj khoom tam sim no siab dua li qub (txawm tias ze rau qhov ntsuas tam sim no), tooj liab poob thiab cua sov nce siab. Rov qab EMF amplitude poob los ntawm ntau dua 15%, nrog waveform clipping thiab glitches. Lub zog muaj zog poob qis dua 0.8 (feem ntau Ntau dua lossis sib npaug ntawm 0.9), thiab kev siv hluav taws xob nce los ntawm tsawg kawg yog 8% -15, ua rau muaj kev ua haujlwm tsawg thiab kev siv hluav taws xob siab.

Kev ua haujlwm tsis zoo yog qhov pom tseeb: kub nce sai dua, stator winding kub yog ntau tshaj 30℃siab dua li qub. Rau neodymium-hlau-boronruaj khov hlau nplaum motors, qhov chaw ua haujlwm tau yooj yim tshaj qhov ntsuas kub ntawm 150 degree, tsim kom muaj lub voj voog vicious:demagnetization → kub dua → demagnetization phem. Sib nqus teb distortion feem ntau ua rau muaj kev vibration siab ntawm ob zaug lossis rau lub sijhawm ntawm lub zog zaus. Hauv kev siv tshwj xeeb, xws li lub tsheb fais fab tsav tsheb, demagnetization ua rau tsis muaj zog acceleration thiab txo ntau yam; rau servo motors, positioning raug tee, teb lags, thiab hais kom mus txog qhov ua yuam kev tshaj txwv.

Kev pheej hmoo tsis ncaj ncees tsis tuaj yeem tsis quav ntsej: lub sij hawm ntev overcurrent accelerates stator winding rwb thaiv tsev laus thiab tej zaum yuav ua rau tig-rau-tig luv circuits. Tsis txaus torque ntawm kev kub ceev tuaj yeem ua rau khiav ceev, ua rau muaj kev nyab xeeb yam tsis muaj kev sib tsoo tshuab. Yog tias tsis kho, ib nrab demagnetization yuav maj mam kis mus rau tag nrho lub rotor, nws thiaj li ua rau lub cev tsis muaj peev xwm tsav tsheb. Kev kho yuav tsum tau hloov cov hlau nplaum ruaj khov lossis ua kom tiav rotor sib dhos, ntawm tus nqi siab.