standard rotational speed sensors sensors · the sensors' stainless steel cylindrical housing...
TRANSCRIPT
SensorsStandard Rotational Speed Sensors
rotec GmbH · Joseph-Dollinger-Bogen 18 · D-80807 Munich · GermanyTel: +49 (0) 89 323 651-0 · Fax: +49 (0) 89 323 651-56 www.rotecmunich.de
DS
E0
7-12
.04
· S
tand
ard
Spe
ed S
enso
rs ·
© 2
004
rote
cG
mbH
,M
unic
h ·
Sub
ject
to
chan
ge w
ithou
t pr
ior
notic
e
The rotec sensors described here are designed for non-contact measurement of the rotational speed of a toothed
wheel. Each sensor consists of two magnetoresistive elements and a permanent magnet enclosed in a stainless
steel cylindrical housing with M10x1 outer thread. The sensors themselves are entirely passive. For operation they
require an accompanying electronic unit which converts their analogue output to a TTL signal. The sensors ex-
hibit minimal temperature dependence and their operation is not impaired by dirt or oil films. The output signal
amplitude is independent of the rotational speed. A variety of lengths and designs is available.
The sensors' stainless steel cylindrical housing has an M10x1 outer thread. The target wheel should have a gear
module in the range 0.6 to 2.4mm, a pitch between 1.9 and 7.7mm and a thickness of at least 5mm. A sensing
gap from sensor to wheel of up to 5mm is allowed for. The electronic unit operates for the tooth frequency range
0.1Hz to 20 kHz, i.e. a tooth must be detected at least once every ten seconds. Differential magnetoresistive sen-
sors need to be carefully positioned for both optimal adjustment of orientation w.r.t. the target wheel and setting
of sensing distance.
Measurement Principle Main Features:
◗ M10x1 outer thread
◗ Target wheel: ferromagnetic material
Gear module: 0.6mm to 2.4mm
Pitch: 1.9mm to 7.7mm
◗ Sensing gap up to 5mm
◗ Tooth frequency range: 0.1Hz to 20kHz
◗ Sensor electronic unit: input 5mV to approx 80V,
output TTL level (0/5V)
SensorsStandard Rotational Speed Sensors
rotec GmbH · Joseph-Dollinger-Bogen 18 · D-80807 Munich · GermanyTel: +49 (0) 89 323 651-0 · Fax: +49 (0) 89 323 651-56 www.rotecmunich.de
Sensor Type A
DS
E0
7-12
.04
· S
tand
ard
Spe
ed S
enso
rs ·
© 2
004
rote
cG
mbH
,M
unic
h ·
Sub
ject
to
chan
ge w
ithou
t pr
ior
notic
e
Cable for Sensor Type B and C
Inline Sensor Electronic Unit
Sensor Type B
Standard Sensor Electronic Unit
Sensor Type C
SensorsFourfold Rotational Speed Sensors
rotec GmbH · Joseph-Dollinger-Bogen 18 · D-80807 Munich · GermanyTel: +49 (0) 89 323 651-0 · Fax: +49 (0) 89 323 651-56 www.rotecmunich.de
Main Features:
◗ Outer thread M10x1
◗ Target wheel: ferromagnetic material
Gear module: 1mm to 2.5mm
Pitch: 2mm to 6mm, ideally 2.5mm
◗ Tooth frequency range: 1Hz to approx. 45kHz
◗ Sensing gap up to approx. 1.5mm
The sensor's stainless steel cylindrical housing has
an M10x1 outer thread. The target wheel should have
a gear module in the range 1 to 2.5, a pitch between
2 and 6mm and a thickness of at least 5mm. A sens-
ing gap from sensor to wheel of up to approx. 1.5mm
is allowed for. The electronic unit operates for the
tooth frequency range 1Hz to approx. 45 kHz. The
magnetoresistor arrangement demands that the sen-
sors need to be carefully positioned for both optimal
adjustment of orientation w.r.t. the target wheel and
setting of sensing distance. An 'eightfold sensor'
which provides eight pulses per tooth is also avail-
able.
Measurement Principle
DS
E08
-12.
04 ·
Fou
rfol
d S
enso
rs ·
© 2
004
rote
cG
mbH
,M
unic
h ·
Sub
ject
to
chan
ge w
ithou
t pr
ior
notic
e
The rotec 'fourfold sensor' is used in order to increase the angular resolution of rotational-speed measurements.
The sensors are used when the target wheels have a relatively small number of teeth, e.g. chain sprockets or
gears within a gearbox. Each scanned tooth provides four data points. The sensor comprises 4 magnetoresistive
elements with a permanent magnet enclosed in a stainless steel casing with M10x1 outer thread. The sensors re-
quire an accompanying electronic unit which converts their analogue output voltage to square wave TTL level. The
sensors exhibit minimal temperature dependence and their operation is not impaired by dirt or oil films.