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 Lady Writing a Letter A Lady Writing a Letter A Lady Writing a Letter (also known as A Lady Writing; ) is an oil painting attributed to 17th century Dutch painter Johannes Vermeer. It is believed to have been completed around 1665. The Lady is seen to be writing a letter and has been interrupted, so gently turns her head to see what is happening. She wears twelve pearls (10 on the necklace and two earrings). Many of the objects seen in the painting, such as the woman's coat, the cloth on the table, and the string of pearls, also appear in other Vermeer