Speed

Speed sensor

High-resolution speed measurement systems are used for the construction of torque measuring shafts. Here will be distinguished between optic and magnetic speed sensors.

The two systems deliver two 90° phase-shifted signals with RS422-level. Systems with different pulses per revolution (compare chart actual torque systems) are available for the different series. The two following figures show exemplary the arrangement of the optic and the magnetic system.

Optic Speed System

Magnetic Speed Sensing System

You can see the precise technical executions in the drawings of the respective series.

Customer specific systems can be delivered in addition to the standard system in combination with the torque meter. The following figure shows the components which are needed for the construction of a magnetic speed sensor.

Components of a customer specific designed magnetic speed sensor

The mesmerized ring, a locating ring and the speed module are needed for the construction of a magnetic speed sensor. The measuring element for the acquisition of the magnetic field and the electronic for the pulse forming and the transformation to a RS422-signal are integrated in the speed module. The diameter of the mesmerized ring and the selection of the magnetic measuring element determine the possible pulse range. The mechanic construction can deviate from the presentation drafted above. Thus, it is e. g. possible to scan the magnet wheel not only radial but also parallel to the axis of rotation. Further possibilities are realisable.

Frequency converter

The evaluation of the speed signal takes place in the evaluation unit of the torque measuring system. If necessary different possibilities are available:

• Transmission of the pulses as RS422 signals
• Frequency measuring and indication in the multifunctional display of the TCU
• Frequency measuring and realisation in a free scalable analogue voltage
• Dynamic, free scalable analog output either as EPlug in card FUPLD or integrated. The realisation of the frequency input takes place with 800/1000 Mw/s (measuring values/s) according to a mixed gate- /period measuring method.

Further the instruments Vetas und CAN32-Converter are equipped with dynamic frequency measuring inputs. Therefore they offer the possibility to convert the speed sensor signals independently from a torque measuring system.