1st edition, 20.04.2021
7000.05072, 1st edition, 20.04.2021
7000.05072
Installation
66
4.3.5
Sensor and encoder interfaces
Various solutions for different cable lengths are described in chap. 4.2.2, p. 52. The objec-
tive here should be to increase the signal quality to a reliably usable minimum.
The sensor systems used at FAULHABER for angle determination should be divided
according to their useful frequency range. Depending on the frequency range, various filter
measures are suitable.
Analog Hall sensors (very low frequency)
Digital Hall sensors and quadrature interfaces
Absolute encoder
Fig. 29: Useful frequency ranges of the encoders
To evaluate the interference on the signal (transmission quality), measure the signals.
Make certain that no parasitic effects are measured. Select the reference potential cor-
rectly and measure directly on the controller if possible.
The following statement applies to all mentioned sensor systems: Differential signal trans-
mission with line driver is an effective measure for increasing the interference immunity for
longer cable lengths.
Additional measures for the various sensor systems can be found in the following sections.
Frequency
Analog Hall Sensor
Digital Hall Sensor
Incremental Encoder (IE)
Absolute Encoder (AES)
Signal
10 Hz
100 Hz
1.0 kHz
10.0 kHz
100.0 kHz
1.0 MHz
10.0 MHz
100.0 MHz
