Curious. All corded mowers I assume used AC brushed motors and hence would work just fine on DC as well. But I assume running such universal motors on DC is more efficient than running a universal brushed motor on AC.
So is there an efficiency factor? If the universal AS/DC brushed motor ran fine on 110 VAC, then I wonder what is the equivalent pure DC voltage to give the same performance? 150V, 110V, 90V, 70V? etc bob On Tue, Jul 27, 2021 at 3:29 PM EVDL Administrator via EV <[email protected]> wrote: > > On 25 Jul 2021 at 13:12, Seth Rothenberg via EV wrote: > > > what would it take to replace the cord + rectifier with some number of these > > 40V packs which are available at 6Ah? > > If memory serves, Lee Hart did something similar with small Gates Cyclon > lead cells many years ago. I hope he'll chime in with the details. > > Years ago, I converted a 120vac B&D mower to DC, replacing the 120v PM motor > with a 36v one. I didn't try to use the handle switch for DC - I can't > imagine that it would have fared well - but instead used it to operate a > small golf car type contactor. The downside of that arrangement was that it > sacrificed the dynamic blade braking that the mower had originally, and thus > some safety. > > I powered mine from a 38v 10ah LiFePO4 battery. Instead of putting the > battery on the mower, I carried it in a backpack, which made the mower > easier to maneuver. > > One thing that surprised me was how much current the motor used just > spinning the blade in free air, not even cutting. It was 6-8 amps, if I'm > not mistaken. Seems like a lot, doesn't it? > > David Roden, EVDL moderator & general lackey > > To reach me, don't reply to this message; I won't get it. Use my > offlist address here : http://evdl.org/help/index.html#supt > > = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = > This raises a number of questions, such as "what's actually wrong > with people?," and "is this legal in Spain?" > > -- Found on the net > = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = > > _______________________________________________ > Address messages to [email protected] > No other addresses in TO and CC fields > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > ARCHIVE: http://www.evdl.org/archive/ > LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org _______________________________________________ Address messages to [email protected] No other addresses in TO and CC fields UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/ LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org
