Patent ID: 6845672

Claim:
Sensor system comprising: at least one sensor assembly for measuring a load on a bearing having at least one bearing ring ( 11 ), the at least one sensor assembly comprising a piezoelectric element, characterized in that the at least one bearing ring is provided with a cavity for holding the sensor assembly, the sensor assembly comprising a series mounting between opposing sides of the cavity, the series mounting comprising a piezoelectric plate, a spring with spring stiffness k and a body with mass m mounting between the piezoelectric plate and the spring, the sensor system further comprising processing means connected to the piezoelectric plate for receiving a charge signal representing a charge on the piezoelectric plate, the processing means being arranged to provide a measurement signal representing a load on the bearing from the charge signal below a cut-off frequency and a measurement signal representing the acceleration of the bearing from the charge signal above the cut-off frequency, the cut-off frequency f 0 of the sensor device being equal to ½π√(k/m), in which k is the spring stiffness of the spring and m is the mass of the body.