Likely because most applications lack a 240V DC source. Although for an emergency siren. Having a battery supply and a motor that runs equally well on AC or DC is an advantage. The AC universal brush type motor in lawn mowers, vacuum cleaners, kitchen appliances, shop tools etc. They run just fine on AC or DC. Unless they have a electronic variable speed trigger control. Subway traction motors are series motors as well and will operate on AC or DC. Persons not in the electrical field usually are not aware of the AC universal motor.
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Today's Featured Article - On the Road with Dave Gohl: Auction Musings - by Dave Gohl. I was thinking the other day about all the auctions I've been to in the last few years. There've been many. Some have been very good, some have been well, disappointing to say the least. But no matter how good or bad auctions may be, we always seem to stay until the item we've come for or are interested in is on the block. I've been to some auctions near and far. I think the furthest has been the Two Cylinder 7 in the Amana Colonies last year. Lots of stuff, lots of people. I've also atten
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