Abstract
A precision sensor assembly for rotating members in a machine tool comprises a rotor unit ( 16 ) rigidly fixed to a rotor portion ( 2 a ) of the machine tool and including a sensor ( 5 ) for detecting vibrations produced by the operation of the machine tool, the sensor ( 5 ) comprising a piezoelectric sensitive element ( 6 ) and members ( 7, 8 ) for mechanical amplification of the vibrations. The members ( 7, 8 ) comprise at least one resonant system composed of an elastic element ( 8 ) and a counter-mass ( 7 ) acting on the piezoelectric sensitive element ( 6 ). The rotor and stator units ( 16, 17 ) comprise inductively coupled transmitting and receiving elements ( 10, 11 ) for transferring the signals from the piezoelectric element ( 6 ) contactless to the stator unit ( 17 ). The stator unit ( 17 ) may include an electric amplifier ( 13 ) for further amplifying the transmitted signals.
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