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 well commercially; peaking at fourth, twelfth, and fourteenth on the "Billboard" Mainstream Rock chart respectively. Activity began slowing down for the band by late 2000, with Keenan returning to Tool to finish the recording of what would be their next album, "Lateralus". Keenan returned to A Perfect Circle to tour from January to March 2001, until returning to Tool again for the rest of 2001 to release and tour in support of "Lateralus". Initial plans were for Howerdel to collaborate long-distance on writing new A Perfect Circle material with Keenan while he toured with Tool, by sending ideas back and