Sensors for motion control - Speed sensors - System description

  • 2 in 1: speed sensor and evaluation in one compact housing
  • Space-saving design
  • Easy to fit
  • Easy parameter setting by potentiometer or pushbutton

Inductive sensor with integrated speed evaluation
In many industrial applications drives need to be monitored for rotational speed or standstill. A typical application in building automation is V-belt monitoring on fans. In conveying, standstill monitoring is used to detect belt break on conveyors. A similar principle is applied in agricultural engineering to monitor elevator drives or detect failure of screw conveyors. Application examples can also be found in the textile industry. Here the compact speed sensor signals thread break on sewing machines.

The compact DI speed monitor series offers a specially low-cost and reliable solution. In principle it is an inductive sensor with integrated speed evaluation. Advantage: the condition information of the drive is directly transferred to the control system.

The nominal speed is easily set by potentiometer or pushbutton.

ifm electronic offers the right unit for each application. The user can choose between M18 and M30 types with either M12 connector or cable. There are 2-wire and 3-wire units with either NC or NO function. For use in hazardous areas ifm offers speed sensors with ATEX 3D approval.

Magnetic speed sensors
  • Switching frequencies up to 15,000 Hz.
  • Precise detection of rotational speed and direction of rotation.
  • Wide temperature range: -32...125 °C.
  • Installation within seconds thanks to the flanged housing.
  • Flexible combination of housings, connections and output signals.

Magnetic sensors for metallic toothed wheels
Magnetic sensors are used for the detection of positions without contact or wear and tear in automation.

For many years such sensors have been used directly in electric drives. Primarily, this type with two NPN switching signals is used for control purposes in mobile machines. But it is also used on conveyor drives in industrial applications.

Due to the standardised toothed wheel modules and switching signals cost-effective solutions can be implemented. The sensor provides a pulse for each tooth.

The direction of rotation is detected by two slightly shifted measuring cells. This shift is designed for a standardised toothed wheel module to obtain a signal shift of 90°. Other modules can also be detected depending on the installation conditions or the phase shift.

Operating principle
The MX5 series magnetic sensors use the Hall effect. The measuring cell reacts to changes in the magnetic field intensities and generates a proportional voltage signal. An output signal is switched from a defined threshold level. The Hall measuring cells function reliably and without contact even in case of heavy soiling. These "magnetically biased" sensors have an internally integrated permanent magnet. The ferromagnetic teeth on a toothed wheel change the existing magnetic field such that a corresponding switching signal can be generated.

More information

System overview — Speed sensorsProduct Innovations — Speed sensors

Speed monitors | ifm
In conveying, compact speed monitors are used to monitor drive shafts and conveyor belts.