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BODAS speed sensors | About this product
Example DSA/20
Two basic variants
available for DSA/20
Application examples
Bosch Rexroth AG, RE 95290-01-B/2021-09-13
A6VM axial piston variable motor with mounted DSA/20 speed sensor:
Fig. 10: A6VM with mounted speed sensor DSA/20
• DSA1 series 20 returns a square-wave signal which is proportional to the speed
as well as a switching signal for detecting the direction of rotation.
• DSA2 series 20 provides two square-wave signals (90°±20° phase shift)
for the redundant recording of the rotational speed. In addition, this can be
used, for example, to calculate the direction of rotation using a control unit from
Rexroth.
• Additionally, both variants comprise of an NTC thermistor, which enables
measuring the temperature in the installation location of the sensor.
5.2 Product description DSM/10 and DSM/20
The Hall effect-based speed sensor DSM/10 and DSM/20 collects the rotational
speed signal of ferromagnetic gear wheels or punching sheets. As an active sensor,
it delivers a signal with a constant amplitude that is independent of the rotational
speed. The sensor distinguishes itself not only due to the fact that it can detect
the direction of rotation, but also because of its additional diagnosis functions
such as:
• Standstill detection
• Critical air gap
• Critical installation position
Due to its compact, sturdy design the sensor is suitable e.g. for integrated use
• In the wheel bearing for wheel speed acquisition
• In the transmissions or gear stages
• Fan drives in buses, trucks and construction machinery (7 to 20 kW)
• In vibration drives for road rollers and pavers
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