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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
slowing down a motor with a vbox
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<blockquote data-quote="jeallen01" data-source="post: 1129168" data-attributes="member: 176704"><p>its funny i was going to ask this question but searched first which led me here</p><p></p><p>In reality, using a snetwork of parallel-connectoed wirewound resistors in series with the motor is the best idea to drop the voltage from about 36V to, say, 30V, i.e. by about 6V -> simple Ohm's Law calculation of R = V/I where</p><p>V = 6V</p><p>I - motor current (maybe 2-3A, but I can't remember exactly)</p><p>-> R = required value of resistor in Ohms = 2-3 Ohms</p><p></p><p>But also the total resistor Wattage needs to be at least I Squared x R = 3x3x (2 or3) xat least ->18W-27W -> maybe 3x 10W resistors connected in parallel (maybe something from <a href="https://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p2380057.m570.l1313&_nkw=8W+wireworund+resistor&_sacat=0" target="_blank">here)</a> and fitted in a water-resistant enclosure.</p><p></p><p>Did something very similar when I had to drive the 24V NEC H-2-H motor (probably Jaeger anyway) of my original NEC 5000 System from the 36V o/p of the Echostar AD3000ip which replaced that Rx</p></blockquote><p></p>
[QUOTE="jeallen01, post: 1129168, member: 176704"] its funny i was going to ask this question but searched first which led me here In reality, using a snetwork of parallel-connectoed wirewound resistors in series with the motor is the best idea to drop the voltage from about 36V to, say, 30V, i.e. by about 6V -> simple Ohm's Law calculation of R = V/I where V = 6V I - motor current (maybe 2-3A, but I can't remember exactly) -> R = required value of resistor in Ohms = 2-3 Ohms But also the total resistor Wattage needs to be at least I Squared x R = 3x3x (2 or3) xat least ->18W-27W -> maybe 3x 10W resistors connected in parallel (maybe something from [URL='https://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p2380057.m570.l1313&_nkw=8W+wireworund+resistor&_sacat=0']here)[/URL] and fitted in a water-resistant enclosure. Did something very similar when I had to drive the 24V NEC H-2-H motor (probably Jaeger anyway) of my original NEC 5000 System from the 36V o/p of the Echostar AD3000ip which replaced that Rx [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
slowing down a motor with a vbox
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