摘要:
Adjusting emulated encoder frequencies in an example embodiment can include determining a difference between an encoder count and a theoretical encoder count and adjusting a frequency of an emulated encoder signal to mitigate at least some of the difference between the encoder count and the theoretical encoder count.
摘要:
An electronic device includes a frequency variable circuit 15, a filter 16, and an output voltage decision circuit 17. The frequency variable circuit 15 changes the sampling frequency of an analog-digital converter 13. The filter 16 limits the pass band of the output signal of the analog-digital converter 13. The output voltage decision circuit 17 determines the noise level of the output signal of the analog-digital converter 13 after the output signal passes through the filter 16. The electronic device performs self-diagnosis as follows. The frequency variable circuit 15 changes the sampling frequency of the analog-digital converter 13 to a frequency outside of the pass band of the filter 16 so as to change the quantization noise level of the analog-digital converter 13. Then, the output voltage decision circuit 17 determines whether the integral of the quantization noise level is within a predetermined range.
摘要:
L'invention concerne un dispositif pour détecter au moins la position d'une cible mobile pourvue d'au moins un motif et montée pour définir un entrefer dans lequel sont disposées au moins deux sondes sensibles à l'intensité d'une grandeur physique, le déplacement de la cible provoquant pour chaque passage d'un motif devant une sonde, une variation de l'intensité de la grandeur physique captée par la sonde. Les moyens de traitement ( 11 ) comportent :
des moyens ( 12 ) de détermination d'un premier signal ( S a ) dit absolu obtenu à partir d'au moins un signal de sortie ( S 1 , S 2 ), des moyens ( 13 ) de détermination d'un deuxième signal dit différentiel ( S d ) obtenu à partir de la différence entre aux moins deux signaux de sortie ( S 1 , S 2 ), et des moyens ( 14 ) de comparaison entre le signal absolu ( S a ) et le signal différentiel ( S d ) délivrant un signal binaire ( S b ) représentatif d'au moins la position de la cible mobile.
摘要:
A device and a method for non-contacting sensing of the rotational state of a rotor (10). The rotor has a surface divided into an electrically conductive part (1e) and a non-conductive part (1f). Three electric coils (2a, 2b, 2c) are each included in a respective parallel resonant circuit and are applied close to and with their longitudinal axes oriented towards the rotational path of the electrically conductive part of the rotor. The resonant oscillations are damped depending on the rotational position of the rotor. The rotational state is evaluated with an electronic circuit. In a liquid-flow meter, the coils may be applied in the dry part of the meter.
摘要:
A magnetic position detector comprising a soft magnetic target wheel, a magnetic sensor and a permanent magnet. The invention relates to magnetoresistive sensors in several geometrical configurations of the target wheel, the sensor and the magnet. All configurations result in a big change of direction of the magnetic field at the location of the sensor as a result of a rotation of the target wheel. The configurations have in common that the direction of the magnetic fiel at the location of the sensor, as generated by the permanent magnet, is predominantly in the plane of the sensor surface, both when the sensor is next to a slot and next to a tooth of the target wheel, the surface of the sensor being substantially normal to the direction of movement of the target wheel.