10 - prenosnici snage.pdf
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Prenosnici snage moraju da ispune slede!e zadatke:
—
da reguli"u obrtni moment, broj obrtaja, smer obrtaja, itd. u zavisnosti od vrs
optere!enja;
—
da reguli"u radne karakteristike (protok, napor) pumpi, kompresora, itd.;
— da izvr "e sumiranje potrebne snage motora pri grupnom pogonu vi"e razli#i
— da obezbede miran start i za"titu od preoptere!enja pogonskog motora.
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Uvo$enje prenosnika kao posrednika izme$u pogonske i radne ma"ine diktirano je usradne tako i pogonske ma"ine.
1.
Potrebna ugaona brzina radne ma"ine vrlo retko odgovara najpogodnijoj ugaon
ma"ine (obi#no je mnogo manja).
2.
%est je slu#aj da ugaonu brzinu glavnih delova radne ma"ine treba menjati neza
brzine pogonske ma"ine, jer menjati ugaonu brzinu pogonske ma"ine u "irim gr
neekonomi#no, ili #ak i nemogu!e.
3. Pogonske ma"ine imaju obi#no konstantnu ili pribli&no konstantnu ugaonu brzin
obrtni momenat.
4.
Ve!e smanjenje minutnog broja obrta kod pogonske ma"ine u ve!ini slu#ajeva d
smanjenja obrtnog momenta, "to je vrlo nepovoljno za radnu ma"inu, jer ona za
momente pri malim brzinama.
5. Brojevi obrtaja pogonskih ma"ina obi#no su veliki, a obrtni momenti mali, dakle
posti&e se velikim ugaonim brzinama a malim obrtnim momentima.
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