Žiūrite į du elektrinius dviračius. Abu reklamuoja „750W variklį“. Abu turi panašias baterijų specifikacijas. Abu kainuoja maždaug tiek pat. Tačiau bandymo metu vienas lengvai įveikia vietinį kalną, o kitas kovoja, verčia jus minti stipriau ir lėčiau.
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Kas vyksta? Kaip du dviračiai su tokia pačia galia gali taip skirtingai elgtis kopiant į kalną?
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Atsakymas slypi koncepcijoje, kurios daugelis važiuotojų nepastebi: sukimo momentas, variklio vieta ir jėgos fizika. Paaiškinkime, kodėl kai kurie elektriniai dviračiai puikiai kopia į kalnus, o kiti geriau jaučiasi lygumose.
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Klaidinantis „vatų“ pobūdis
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Pirmiausia išsklaidykime dažną painiavą.
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Vatai matuoja galią – energijos perdavimo greitį. Tačiau vien galia neatskleidžia, kaip ta energija perduodama žemei.
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Pagalvokite taip:
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* Sunkumų kilnojimo sportininkas ir maratono bėgikas abu gali trumpam generuoti panašią didžiausią galią.
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* Bet sunkumų kilnojimo sportininkas gali pakelti štangą, kuri sutraiškytų bėgiką.
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Kodėl? Sukimo momentas.
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Veiksnys 1: Sukimo momentas yra tai, kas iš tikrųjų stumia jus į kalną
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Sukimo momentas yra sukimo jėga – rotacinė jėga, kurią variklis perduoda ratui. Matuojamas Niutonmetrų (Nm), sukimo momentas lemia, kaip stipriai jūsų dviratis traukia iš vietos ir kaip gerai jis išlaiko tą trauką prieš gravitaciją.
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Štai paprastas ryšys:
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* Didesnis sukimo momentas = geresnis įkalnių įveikimas
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* Didesnė galia (W) = didesnis maksimalus greitis
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Du 750 W varikliai gali turėti labai skirtingą sukimo momentą priklausomai nuo konstrukcijos. Variklis su 80 Nm sukimo momentu įveiks stačią įkalnę daug geriau nei 750 W variklis su tik 40 Nm – nors abu yra „750 W“.
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Žiūrėkite į sukimo momento specifikacijas, ne tik į vatų skaičių.
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Veiksnys 2: Variklio vieta keičia viską
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Tai didžiausias skirtumas įkalnių įveikimo našume.
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Ratų varikliai (pavarų vs. tiesioginio pavaros)
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Dauguma prieinamų elektrinių dviračių naudoja ratų variklius, integruotus į ratą.
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* Pavarų ratų varikliai turi vidines planetines pavaras, kurios padaugina sukimo momentą. Jie gana gerai įveikia įkalnes ir dažni miesto dviračiuose.
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* Tiesioginio pavaros ratų varikliai neturi pavarų. Jie paprasti ir patvarūs, bet mažiau sukimo momento sukuria mažais greičiais – todėl sunkiai įveikia stačius startus.
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Ratų variklio apribojimas: variklio greitis tiesiogiai priklauso nuo rato greičio. Stačiame įkalnėje, kai ratas sukasi lėtai, variklis taip pat sukasi lėtai – būtent ten, kur jis sukuria mažiausiai sukimo momento.
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Vidurio varikliai
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Vidurio varikliai (montuojami prie dviračio apatinio laikiklio) veikia kitaip – ir protingiau.
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* Jie suka grandinę, išnaudodami jūsų dviračio esamas pavaras
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* Įkalnėje perjungiama į žemą pavarą, variklis sukasi greičiau, o ratas sukasi lėtai
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* Šis pavarų efektas padaugina sukimo momentą būtent tada, kai jo labiausiai reikia
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Rezultatas: 500 W vidurio variklis gali įveikti 750 W ratų variklį, nes naudoja pavaras, kad didelį variklio greitį paverstų dideliu rato sukimo momentu.
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Veiksnys 3: Bendras sistemos svoris
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Gravitacija nesidomi jūsų variklio specifikacijomis – jai rūpi masė.
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Lengvesnis elektrinis dviratis su vidutiniu varikliu kartais gali geriau įveikti įkalnę nei sunkesnis dviratis su galingu varikliu, nes tiesiog reikia kilnoti mažesnį svorį į viršų.
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Apsvarstykite:
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* Elektrinis dviratis A: 55 svarai su 65 Nm sukimo momentu
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* Elektrinis dviratis B: 75 svarai su 80 Nm sukimo momentu
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Įstrižoje įkalnėje lengvesnis dviratis gali atrodyti jautresnis, nes galios ir svorio santykis yra artimesnis nei rodo sukimo momento skaičiai.
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4 faktorius: Vairuotojo svoris ir pozicija
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Jūs taip pat esate sistemos dalis.
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* Svorio paskirstymas: Įstrižoje įkalnėje, laikant svorį centre (ar šiek tiek į priekį), išlaikomas priekinių ratų sukibimas.
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* Pedalavimo įtaka: Vidurinio variklio sistema reaguoja į jūsų pedalavimą; jei stipriai spaudžiate, ji suteikia daugiau galios. Stebulės varikliai sukasi nustatytu greičiu nepriklausomai nuo jūsų pastangų.
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5 faktorius: Padangų pasirinkimas ir slėgis
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Storos, gumbuotomis padangos sukuria riedėjimo pasipriešinimą ir sveria daugiau. Įkalnėje tas papildomas trintis ir masė veikia prieš jus.
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* Siauresnės padangos su mažesniu riedėjimo pasipriešinimu efektyviau įveikia įkalnes ant asfalto
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* Mažesnis padangų slėgis didina sukibimą, bet taip pat didina pasipriešinimą – kompromisas važiuojant purvinais įkalniais
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6 faktorius: baterijos įtampa ir tiekimas
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Ne visos „48V“ sistemos yra vienodos.
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* Aukštesnė įtampa sistemos gali tiekti daugiau galios nesušildydamos
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* Baterijos iškrovimo greitis (C-reitingas) turi įtakos, ar variklis iš tikrųjų gauna jam priskirtą galią
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* Baterija, kuri nusileidžia esant apkrovai, atims įkalnės našumą net ir geram varikliui
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Realių sąlygų palyginimas: PVY modeliai
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Pažiūrėkime, kaip tai veikia su tikrais dviračiais.
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PVY Z20 PLUS
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* Variklis: 1000 W pikinė galia
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* Sukimo momentas: 100 Nm
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* Padangos: 20×4.0" storos padangos
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* Geriausia: Purus reljefas, smėlis, sniegas – kur trauka svarbi tiek pat, kiek galia
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PVY LS20
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* Variklis: 250W nominali galia (atrakinamas iki 1000W)
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* Sukimo momentas: 100 Nm
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* Dizainas: Pavarų hubas su dideliu sukimo momentu
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* Geriausia: Miesto kalvos ir greiti startai
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PVY Z20 MAX / PRO EVO
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* Abiejuose yra sukimo momento jutikliai, kurie matuoja, kaip stipriai minate, ir suteikia proporcingą pagalbą. Tai leidžia kopti į kalną natūraliai – dviratis iš karto reaguoja į jūsų pastangas.
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Sukimo momento jutiklio pranašumas
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Kalbant apie sukimo momento jutiklius: jie nusipelno ypatingo paminėjimo kalnams.
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Dviratis su sukimo momento jutikliu (kaip Z20 MAX ir Z20 PRO EVO) skaito jūsų pedalų spaudimą ir proporcingai suteikia variklio pagalbą. Įkalnėje, kai spaudžiate stipriau, dviratis atsako stipriau. Rezultatas – sklandus, galingas pojūtis, imituojantis stipresnes kojas.
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Žingsnio dažnio jutikliai (dažni biudžetiniuose dviračiuose) tiesiog įjungia variklį, kai minate pedalus. Jiems trūksta intuityvios, kopimui palankios reakcijos.
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Santrauka: Ko ieškoti kalnų įveikėjui
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Jei svarbiausia yra kopti į kalnus, žiūrėkite ne tik į vatų lipduką:
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1. Patikrinkite sukimo momento specifikacijas – didesnis Nm = geresnis įkalnės įveikėjas
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2. Apsvarstykite vidurinį variklį dėl padidinto sukimo momento per pavaras
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3. Išbandykite važiavimą su sukimo momento jutikliu – svarbi reakcijos greitis
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4. Apsvarstykite bendrą svorį – lengvesnis dviratis lengviau įveikia kalną
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5. Parinkite padangas pagal reljefą – nevilkite knobby padangų ant asfalto
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Pagrindinė mintis
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Du elektriniai dviračiai su ta pačia galia kalne gali jaustis visiškai skirtingai dėl sukimo momento, variklio tipo, pavarų, svorio ir jutiklių technologijos.
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Kitą kartą, kai išbandysite dviratį, neklauskite tik „Kiek vatų?“ Paimkite jį į statžiausią kalną, kokį tik rasite. Ten slypi tiesa.