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Thomas Tornblom

(Steven Swift) writes:

writes:

Dc motors wont work on ac of any frequency. Low frequencies used in
traction improve the motors' starting torque, and of course this is
important.

Not quite true. Series wound DC motors (often called "universal" motors)
work on AC and DC. Frequency is a don't care. Often used in cheap appliances,
like mixers or hair dryers.

Engine starters are also frequently of this type. Perhaps less now
with permanent magnet gear starters.

Steve.

--
Steven D. Swift, , http://www.novatech-instr.com
NOVATECH INSTRUMENTS, INC. P.O. Box 55997
206.301.8986, fax 206.363.4367 Seattle, Washington 98155 USA

Thomas