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COMPENDIUM
Geartooth Sensors
The category geartooth sensors comprises speed sensors as well as com-
bined speed and direction sensors.
Speed and Direction Measurement
The Cherry SD series speed & direction sensors provide both speed and
direction output. The SD series sensor incorporates two Hall effect ICs that
are slightly offset from one other. Internal conditioning logic analyzes the
phase difference between the two sensors to determine the direction of the
target rotation.
The standard SD series sensor has two separate digital outputs. It uses an
open collector (sinking) output. The speed output switches from high (Vcc)
to low (close to zero) when it detects a transition from "no-tooth" to "tooth
present." The separate direction output is high when gear rotation is clock-
wise, and low when gear rotation is counter-clockwise.
Operating a Speed Sensor
Although commonly called a geartooth sensor, a solid-state speed sensor
can detect the motion of various ferrous objects with some type of discon-
tinuous surface.
Examples of appropriate targets include:
? Sprockets
? Bolt heads
? Roller chains
? Cavities in smooth surfaces
For best results, we recommend targets made from low carbon cold-rolled
steel. Other factors that in?uence sensor performance include geartooth height
and width, space between teeth, shape of the teeth and target thickness. As
a general guideline, consider a target with the following minimum parameters:
Orientation
Cherry GS series geartooth sensors are not orientation-sensitive. Cherry
SD series speed & direction sensors do have an orientation requirement,
and the appropriate orientation is noted on the part itself.
Operating Life
As a solid-state device with no moving parts, a Cherry geartooth sensor ’s
operational life is virtually unlimited.
Frequency
The measuring range is somewhat dependent on the target and particular
sensor, but maximum frequency is generally >10 kHz. Care must be taken
in calculating the frequency depending on the target geometry. With asym-
metrical targets, for example, ones with narrow tooth widths compared to
tooth gaps, the time between the leading and trailing edge of the tooth is
generally the governing factor. Our sensors have maximum response times
from approximately 10 μS (MP series) to 50 μS (GS series) due to internal
Hall cell processing schemes. If your response time is close to these num-
bers, unexpected results, such as lost counts, can occur.
As opposed to a variable reluctance sensor, a Cherry GS series geartooth
sensor has an output amplitude that is independent of input frequency. It
does not require a minimum speed. However, it does require some initial
movement of the target in order to locate the tooth edge. We therefore call
it a "near-zero-speed" sensor, whereas others refer to similar products as
"zero-speed" sensors.
Tooth height
Tooth width
Distance
Target thickness
Position Sensor with Ring Magnet
between teeth
Cherry’s solid-state magnetic position sensors also make excellent speed
5 mm
(.200”)
2.5 mm
(.100”)
10 mm
(.400”)
6.25 mm
(.250”)
sensors when coupled with a rotating ring magnet. Advantages of this
approach include:
? lower sensor cost
? larger airgaps and
Sensing
Tooth
Height
? absolute zero-speed sensing.
N
Tooth
Spacing
Gap
Tooth
N
S
S
S
S
N
Tooth
Width
N
Thickness
Airgap (Distance Sensor – Target)
The required distance between sensor and target depends on the installation
situation. In general, smaller gearteeths require smaller airgaps while larger
gearteeth allow for larger airgaps. Consider starting with an airgap of 1 to
2 millimeters (.040" to .080").
26
Speci?cations subject to change without notice.
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相关PDF资料
SDP8407-001
PHOTOTRANSISTR SILICON NPN
SDP8436-004
PHOTOTRANSISTOR SILICON NPN T-1
SDP8476-201
PHOTOTRANSISTOR NPN SIDE LOOK
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