| 摘要 |
An acoustic sensor for monitoring machining processes in machining tools, e.g. grinding machines, includes a stationary unit, or stator ( 21 ) and a rotating unit, or rotor ( 23 ), the latter being coupled, for instance, to the grinding wheel and rotating with it. The rotor includes a support ( 45;45 ') and a piezoelectric transducer ( 33 ). The position of the transducer is defined and locked without using glues by means of mechanical elements ( 48, 53, 54; 63, 64; 74, 78 ) that may include elastic elements such as springs. The rotor also includes a printed circuit board ( 55 ), connected to the piezoelectric transducer, with a charge amplifier ( 37 ) for amplifying the output signal of the piezoelectric transducer. The rotor is electrically coupled to the stator by means of transformer type couplings ( 30, 31 ).
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