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2.2 Functional principle
The GEL 244 scans the target (toothed wheel) con-
sisting of a ferromagnetic material. The magnetic
field of the probe is modulated by the passing of the
ferromagnetic toothed wheel. This modulation is
evaluated in the sensor and converted to a sine or
square wave output signal.
The given maximum distance and other mounting
tolerances must be maintained. Otherwise, correct
operating of the speed sensor over the whole tem-
perature and frequency range cannot be guaranteed.
A separate electronic circuit (optionally deliverable by
power supply for the MiniCoder, performs the evaluation of the measuring pulses and
establishes the closed loop.
Sinusoidal measuring signals (here for track 1):
3 V
u
1
U
=
ref
2.5 V
u
1
2 V
0°
90°
14
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LENORD
u
(t) = U
1
–
u
(t) = U
1
u
(t) = U
2
–
u
(t) = U
2
(sign depends on sense of
rotation)
U
= 5 V; û = 250 mV
electric
B
angle
630°
720°
1
1
2
2
Option
N
N
) has to provide the
BAUER
/2 + û·sin(2·π·f·t)
B
/2 – û·sin(2·π·f·t)
B
/2
û·cos(2·π·f·t)
B
/2
û·cos(2·π·f·t)
B
GEL 244
or
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