초록 ▼

A magnetic sensor bearing utilizes an adaptive threshold circuit for signal processing in order to compensate for external factors such as temperature, stress, aging, and external magnetic fields which all affect a fixed reference signal used with a comparator. As the magnetic sensor\s output signal

A magnetic sensor bearing utilizes an adaptive threshold circuit for signal processing in order to compensate for external factors such as temperature, stress, aging, and external magnetic fields which all affect a fixed reference signal used with a comparator. As the magnetic sensor\s output signal drifts due to these external factors, the adaptive threshold circuit causes the reference signals to drift in a complementary manner so that the magnetic sensor bearing continues to function properly in spite of the external factors.

대표청구항 ▼

A speed sensor assembly for use with a bearing assembly and a rotatable shaft, said sensor assembly comprising in combination: means for providing a magnetic signal corresponding to the rotational speed of said rotatable shaft, said means connected to said shaft; a solid-state magnetic sensor for de

A speed sensor assembly for use with a bearing assembly and a rotatable shaft, said sensor assembly comprising in combination: means for providing a magnetic signal corresponding to the rotational speed of said rotatable shaft, said means connected to said shaft; a solid-state magnetic sensor for detecting said magnetic signal, said sensor providing an analog output signal to a sensor output terminal, said output signal being proportionate to said magnetic signal and the speed of rotation of said shaft; means for mounting said sensor on said bearing assembly; and an adaptive threshold circuit connected to said sensor output terminal, and processing said sensor signal to provide a square-wave digital output signal, said adaptive threshold circuit consisting of: a comparator having first and second analog input signal terminals and one digital output signal terminal; a first analog comparator input signal terminal connected to said sensor output terminal and having a positive feedback signal from said comparator output terminal connected to said fist comparator input terminal to provide hysteresis; and a second analog comparator input signal terminal connected to said sensor output terminal and a low-pass filter in series, said low-pass filter consisting of a resistor and a capacitor; said comparator being responsive to the relative amplitudes of said fist and second input signals so as to provide a corresponding signal output signal to said comparator output terminal, and said adaptive threshold circuit being integrated entirely onto an integrated circuit chip, with the exception of said capacitor in said low-pass filter.