Low-Cost Elektronik für BLDC-Motor ROMOTION mit 5 Cent Stück

Low-Cost Electronics

Rotek customarily offers Romotion with integrated control electronics. However, complex control options are not necessary for an application where a solid standard solution will also suffice. Often, customers only require a relatively simple speed control and change of rotation direction. In such cases, Rotek offers its customers low-cost control electronics developed by its partner company ebeTEC in Austria for Romotion.

Sensorless operation

The motor controller for 24 V DC works without sensors and upgrades the “back EMF” for commutation. As a result, factory sensors are not required in the motor, making the drive inexpensive. The speed setpoint value is determined by the voltage input range between 0 and 10 V. In addition, there is a 10 V digital input for the direction of rotation. Finally, there is an open collector output for speed monitoring with 2 pulses per revolution. A power output up to 100W / 4A is possible.

Significantly less space required

The control electronics are cast and sealed directly in the motor body in a “hot melt” process. This is integrated in the connecting cable of the motors. No additional slot, installation space, housing or control cabinet is needed which significantly reduces the space and wiring work required and keeps our product flexible and inexpensive. It also has optimal protection against environmental influences.


Simple drive-tasks e.g. for ventilators, pumps or the drum-turning of rotation heat-exchangers

Click here for the flyer and technical specifications


The L44 is now available again. However, if required, we can offer another low-cost alternative in the meantime. Martin Schulz martin.schulz@rotek-motoren.de and Niklas Treusch niklas.treusch@rotek-motoren.de will be happy to advise you.

Functions and benefits

ROMOTION 44 and ROMOTION 84 with Low-cost-electronics

  • Setpoint setting and operation is performed via IOs or analogue voltages.
  • Motor controller for brushless DC motors that are operated without sensors / with BEMF (BackElectroMotiveForce).
  • The very compact control electronics are integrated in the connecting cable of the motors.
  • The controller is adapted to the respective application and the drive motor used.
  • Possible modes of operation: Speed controller or speed regulator (must be defined in advance)
    • Speed controller: the speed is monitored and controlled by a higher-level system
    • Speed regulator: the controller regulates the speed within the limits of what is feasible and keeps it stable.
  • It can also be operated as a 4-quadrant controller. The control electronics can brake and accelerate – short braking is also possible.
  • All the electronic components used are selected in accordance with the highest industry standards.
  • Durable because no components are used that may age (e.g. Elkos).
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