RDS - Regenerative Dynamometer Systems

Load Dynamometer

The Motomea RDS are full turnkey systems, which fully implement standards IEC 60034-2-1, CSA_C390, IS 12615, and IEEE 112. The scope of the RDS is comprised of: AC induction servomotors as loading motors with high-resolution encoders, high-accuracy torque sensors, integrated power analyzers, and temperature measurement modules by milliohm meters and/or thermocouples. Motomea RDS provides energy recovery benefits, and the multi-drive common bus configurations can reduce input power requirements for applications where an AC dynamometer is used for the prime mover and absorber.


  • Controlled by closed-loop field-oriented, using auto-tune servo drives.
  • Controlled and stabilized DC supply for the frequency inverter, allowing stable control of the torque or speed, with high accuracy.
  • The combined control system that includes PC, OPLC, regenerative units, and VFD’s, which connect together with fast and reliable Industrial CanBus and TCP/IP communications networks.
  • Usage of AC Induction Servomotors, with a low moment of inertia, allowing the excellent, fast, and accurate dynamic response, in all ranges of torque and speed.



Standard Testing:

  • Torque, speed, voltage, current, input/output power, efficiency.

 Special Testing:

  • Running performance under different working conditions.
  • Temperature measurement.
  • Motor stalling performance.
  • Efficiency by summation of separate losses: constant, friction, windage, iron, stator winding, rotor.
  • Cogging torque.
  • Torque ripple.



The RDS software allows the user to simulate the loads and the real work of the motor inside different applications. The user can maintain the load by:

  • Torque, using the feedback of the torque sensor.
  • Speed, using the feedback of the high-resolution encoder of the servomotor


The software includes an advanced interface, allowing the user to perform all the tests he needs, to save the results to the system’s database, and to produce different types of test reports in MS Excel and PDF format.


The term “regenerative” describes the ability of the drive, under braking conditions, to convert the mechanical energy of the motor and connected load into electrical energy, which is returned (or regenerated) to the AC power source. Regenerative drives can reclaim the majority energy produced from the device under test, which can reduce the overall cost of testing. Historically, the regenerative energy was wasted into heat, using a resistors bank. The Motomea RDS solution is to return the energy back into the mainline power supply, eliminating heat and providing a real return on investment; it’s a compact/modular solution.


  • Advanced interface, allowing the user to perform all the tests he needs.
  • Strong capability for database processing, easy for checking, and comparing.
  • Customer design, satisfied user’s needs.
  • A remote fault diagnosis system helps to resolve problems timely.
  • Open software interface, connecting with the third party’s system easily.
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