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Some DC and AC Motor History
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[quote]<i>Originally posted by lonewoof</i> <br /><br />Motors are specified for "208/240 volt" operation because they are designed to be used on normal house-supply voltage (240 volts, actually two 120v. circuits 180 degrees out-of-phase) OR on 208 volts, which is the phase-to-phase voltage of three-phase power that is normally supplied to (small) industrial or commercial users. <br />I worked at a TV station that had only 3-phase (120/208) power. To install a window air conditioner, we used a small transformer to boost the 208 v. to somewhere around 232 v.[/quote <br /> <br />It is possible that the small transformer was installed for the purpose you state, but it is much more likely that it was installed as an isolation transformer to protect the motor in the air conditioner from the radio frequency "noise" that the TV station equipment puts on the power. Unprotected motors tend to burn out the first winding of the stator if there is a lot of RF harmonics in the power. Isolation (otherwise known as smoothing) transformers are very common where there is equipment like transmitters, variable frequency drives and the like.
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