Circle diagram constant air-gap induction motor images shown here, where, The circle diagram is drawn using the data obtained from no load and either short circuit or, in case of machines, blocked rotor tests by fitting a half-circle in points O and A. Beyond the error inherent in the constant air-gap assumption, the circle diagram introduces errors due to rotor reactance and rotor resistance variations caused by magnetic saturation and rotor frequency over the range from no-load to operating speed. Steinmetz equivalent circuit Circle diagram First conceived by A. Heyland in 1894 and B.A. Behrend in 1895, the circle diagram is the
A Circle in the Fire A Circle in the Fire "A Circle in the Fire" is a short story by Flannery O'Connor. It was written in 1954 and published in 1955 in her short story collection "A Good Man is Hard to Find". A devout Roman Catholic, O'Connor often used religious themes in her work. The story involves Mrs. Cope, the owner of a farm in the South, who is visited by three teenage boys, including Powell Boyd, the son of one of her former farm workers. Mrs. Cope, her workers, and her daughter are all suspicious of the boys. The boys hitchhiked from Atlanta