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 Perfect Circle of relevance and quality in contemporary rock music. Online music magazine musicOMH asserted the band had "literally defined alternative rock as we know it." Current members Touring members Former members A Perfect Circle A Perfect Circle is an American rock supergroup formed in 1999 by guitarist Billy Howerdel and Tool vocalist Maynard James Keenan. A Perfect Circle has released four studio albums, the first three during the early 2000s: "Mer de Noms", their debut album in 2000, and followed up by "Thirteenth Step" in 2003; then in 2004, "Emotive"—an album of radically re-worked cover songs titles. Shortly after "Emotive"s release,