Panthawi ya braking, kuwonongeka kwa mkati kwa injini ndi kuwonongeka kwa makina ndi pafupifupi 20% ya torque yovotera.
Chifukwa chake, ngati torque yofunikira ndiyocheperako kuposa mtengo uwu, palibe chopinga chakunja chomwe chimafunikira. Makina osinthira ma frequency (VFD) akagwiritsidwa ntchito kutsitsa kapena kuchepetsa mwadzidzidzi katundu wamkulu wa inertia, galimotoyo imagwira ntchito popanga magetsi ndikutumiza mphamvu zonyamula katundu kudera la DC la VFD kudzera pa mlatho wa inverter, ndikupangitsa mphamvu ya basi ya VFD. kuwuka.
Ikadutsa mtengo wina, wotembenuza pafupipafupi adzanena za vuto la overvoltage (deceleration overvoltage, deceleration overvoltage mwadzidzidzi).
Kuti izi zisachitike, choletsa braking chiyenera kusankhidwa.
Kusankhidwa kwaBraking Resistorkukaniza:
Mtengo wotsutsa wa braking resistor usakhale waukulu kwambiri. Kukana kwambiri kumapangitsa kuti pakhale torque yosakwanira ya braking. Nthawi zambiri imakhala yocheperako kapena yofanana ndi mtengo wa braking resistor resistance wofanana ndi 100% braking torque. Kukaniza kwa braking resistor sikuyenera kukhala kochepa kwambiri, ndipo kusakhale kochepa kuposa mtengo wovomerezeka wa braking resistor. Kuchuluka kwa mabuleki kutha kuwononga mabuleki omangidwira mkati mwa inverter.
Kusankhidwa kwa mphamvu ya braking resistor:
Pambuyo posankha mtengo wotsutsa waBraking Resistor, sankhani mphamvu ya braking resistor malinga ndi kuchuluka kwa ma braking magwiritsidwe a 15% ndi 30%. Kutengera 100kg kuyimitsidwa kwathunthu basi dehydrator mwachitsanzo, pogwiritsa ntchito 11kW frequency converter, kugwiritsa ntchito ma brake ndi pafupifupi 15%: Mutha kusankha 62Ω braking resistor yolingana ndi "100% braking torque", kenako sankhani mphamvu ya braking. wotsutsa. Ponena za "100% braking torque" ndi "15% braking utilization" matebulo, yofananira braking resistor mphamvu ndi 1.7kW, ndipo omwe amagwiritsidwa ntchito kwambiri ndi 1.5kW kapena 2.0kW. Pomaliza, sankhani "62Ω, 1.5kW" kapena 2.0 kW braking resistance.
” Kuti athyoke mwachangu, ma “62Ω, 1.5kW braking resistors” amatha kulumikizidwa mofananira, zomwe ndi zofanana ndi “31Ω, 3.0kW braking resistor”.
Komabe, ziyenera kudziwidwa kuti mtengo womaliza waBraking Resistor olumikizidwa pakati pa ma terminal a P+ ndi DB sayenera kukhala ochepera 30Ω otchulidwa. Kugwiritsa ntchito mabuleki: Izi zikutanthauza chiŵerengero cha nthawi yomwe ili pansi pa braking mpaka nthawi yonse yogwira ntchito. Mlingo wogwiritsira ntchito braking umalola ma braking unit ndi braking resistor nthawi yokwanira kuti athetse kutentha komwe kumapangidwa panthawi ya braking. Mwachitsanzo, ngati makinawo akugwira ntchito kwa mphindi 50 ndipo ali mu braking state kwa mphindi 7.5, kuthamanga kwa braking ndi 7.5/50 = 15%.
Pazochitika zomwe zimafuna kugunda pafupipafupi, monga ma dehydrators, ngati chiwongola dzanja chikupitilira 15% patebulo, mphamvu ya braking resistor iyenera kuchulukitsidwa molingana ndi momwe amagwirira ntchito. Tikukhulupirira kuti kumasuliraku kukuthandizani!
