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 - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
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