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 indicating 1 million copies sold, on October 31, 2000. The album was also well received by critics. The release earned the band the "Best Debut Album" award from the California Music Awards. In the album review by "Rolling Stone", Pat Blashill wrote that Keenan "added an almost operatic angst to Howerdel's songs" and concluded that "A Perfect Circle sound like a desperate dream of what rock used to be. Maybe that's the point." AllMusic's review expressed that "there's little question that the addicting combination of Keenan's aching voice and Howerdel's accomplished songs and production skills made for one of 2000's