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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Jenom doplním, že běžné autorelé je za pár korun, má jmenovitý proud 40A a v této aplikaci vám vydrží v pohodě.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Zdravím<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Ladislav Kručinský<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Hw-list [mailto:hw-list-bounces@list.hw.cz]
<b>On Behalf Of </b>Krucinsky, Ladislav<br>
<b>Sent:</b> Wednesday, November 07, 2018 8:12 AM<br>
<b>To:</b> HW-news<br>
<b>Subject:</b> RE: dve rychlosti DC motorov<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Přepínání směru bych řešil dvěma relé a rychlost pouze jedním kanálem PWM. Pak nedojde k problémům které popisuje pan Burian.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Zdravím<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Ladislav Kručinský<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Hw-list [mailto:hw-list-bounces@list.hw.cz]
<b>On Behalf Of </b>František Burian<br>
<b>Sent:</b> Wednesday, November 07, 2018 6:53 AM<br>
<b>To:</b> HW-news<br>
<b>Subject:</b> Re: dve rychlosti DC motorov<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Dobrý den,<br>
<br>
Ze schematu je patrné, že při jízdě vpřed (plné pwm) a přepnutí směru vám prohoří můstek přes relé do napájení.
<br>
<br>
Relé je součástka která je oproti tranzistoru velmi pomalá, trvá jí i desítky ms než kontakty přepne, a v okamžiku, kdy je na cívce už jiné napětí, je dle schematu přeplé pwm na druhý tranzistor, ale kontakt toho relé se ještě nezačal pohybovat ....
<br>
<br>
pokud to máte ma procesoru a měříte stav vpřed/vzad, tak byste měl při každé hraně vpřed/vzad vypnout na pár desítek ms generování PWM. Pak vám nebudou hořet 25A pojistky.<br>
<br>
S pozdravem,<br>
<br>
František Burian<br>
---------- Původní e-mail ----------<br>
Od: Jaro Rybárik <rybarik@xtech.sk><br>
Komu: hw-list@list.hw.cz<br>
Datum: 6. 11. 2018 21:14:43<br>
Předmět: Re: dve rychlosti DC motorov <o:p></o:p></p>
<p class="MsoNormal">Tak nasiel som schemu, je v prilohe (15kB tak snad nikoho nepohorsi). Na
<br>
ovladacom konektore je signal PWM a prepinanie smeru tocenia <br>
(spiatocka). Podla spiatocky sa prepne relatko a tiez jeden z dvoch <br>
kanalov budicov tranzistorov. Takze na jednom kabli motora je stale +12V <br>
a na druhom je PWM na zemi. Ono problem viacmenej urcite bude v tom <br>
"startovacom" prude, hlavne preto, ze tam povodne bola jedna 7Ah gelova <br>
bateria a teraz tam je 44Ah akumulator z auta, takze trocha tvrdsi zdroj <br>
:) Ale ak uprava bude zlozitejsia ako jedna cievka do napajania, tak im <br>
to proste necham s rele ktore je ovladane plynovym pedalom a pojdu stale <br>
naplno :) <br>
<br>
Jaro <br>
<br>
<br>
<br>
On 11/6/18 4:11 PM, Zuffa Jan wrote: <br>
> Ake je zapojenie? <br>
> Moze tam dochadzat k dead time ked su kratko otvorene obidva tranzistory vo vetve
<br>
> alebo tam chyba nadprudova ochrana (elektronicka) ktora eliminuje spicky v najvyssej zatazi
<br>
> ked sa motor rozbieha a motory si naraz cucnu aj 100vku a este ma napada <br>
> spatne otvaranie tranzistorov slupkami z indukcnosti motorov <br>
> Nie som odbornik na PWM u velkych vykonov takze su to len take moje typy. <br>
> <br>
> j <br>
> <br>
> <br>
> -----Original Message----- <br>
> From: Hw-list [mailto:hw-list-bounces@list.hw.cz] On Behalf Of Jaro Rybárik <br>
> Sent: Tuesday, November 06, 2018 4:05 PM <br>
> To: hw-list@list.hw.cz <br>
> Subject: Re: dve rychlosti DC motorov <br>
> <br>
> Ano, taka bola uplne povodna myslienka + nudzove STOP tlacidlo na dialkovom ovladani. Len mi to kazdu chvilu prepaluje tu 25A poistku, ked je to PWM aktivne a osciloskop sa mi nechcelo zatial tahat von k auticku. Ale asi uz dotiahnem auto k osciloskopu, chalani
rastu a toto je mozno posledna sezona aby to auto este vyuzili aj so salt-pakou :)
<br>
> <br>
> Jaro <br>
> <br>
> <br>
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