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Some DC and AC Motor History
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3 Phase AC motors are actually the standard for industrial use. They are very efficient. A 2 phase motor with the phases 120 degrees apart would not run very well. Generally when someone specifies a motor to operate on 208 volts instead of 220 or 240 the reason is that they live in an area that suffers from serious and frequent voltage sags. A motor can absorb slighly higher voltages much better than it can lower voltages. By purchasing a motor that will operate efficiently at the lower voltage they are protecting their operations from all but the worst voltage sags. <br /> <br />The AC commutator motors are also known as universal motors as they run on AC or DC. The motors in Lionel and American Flyer toy trains are this type.
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