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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    +,-,./01 2134.1 +56.,/.40 /.1-6 517

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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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