Abstract: A double-stator and electric machine suitable for achieving sensorless control of the absolute position of a rotor. An inner stator is fixed to a stationary shaft, an outer stator and the inner stator are concentric, and the above components form a stationary part of the electric machine. A rotor is assembled between the outer stator and the inner stator, and forms a rotating part of the electric machine with a moving shaft through a front rotor support. The rotating part is isolated from a front end cap through a front outer bearing. The rotating part is isolated from a back end cap through a back outer bearing after the rotating part is connected with a back rotor support. The moving shaft is isolated from the stationary shaft through an inner bearing.

Abstract: A copolyester and preparation method and use thereof are disclosed. In the diacid components constituting the copolyester, the content of the structure unit of terephthalic acid is 90 mol % or more. In the dihydric alcohol components constituting the copolyester, the content of the structure unit of ethylene glycol is 70-99 mol % and the content of the structure unit of aliphatic dihydric alcohol having 6 or less carbon atoms and having a side chain is 1-30 mol %. The copolyester further comprises a structure unit of polyethylene glycol. The copolyester can be made into fiber by common method, and further made into fabric, and the obtained finished-product has good dyeability to disperse dyes under normal temperature and normal pressure.

Abstract: The ethyl alcohol-detecting device of the present invention includes an ethyl alcohol-detecting portion that calculates an ethyl alcohol content corresponding to an ethyl alcohol concentration, based on a first subject image stored in a memory and a reference image stored in a nonvolatile memory; an interfering substance-detecting portion that calculates a degree of interference corresponding to the concentration of an interfering substance, based on a second subject image stored in the memory and the reference image stored in the nonvolatile memory; and a determination portion that determines that ethyl alcohol has been detected when the ethyl alcohol content is equal to or higher than a first predetermined threshold and the degree of interference is less than a second predetermined threshold, and determines that ethyl alcohol has not been detected when the ethyl alcohol content is equal to or higher than the first predetermined threshold and the degree of interference is equal to or higher than the second p