Meeting electric motors testing requirements for European high efficiency Standards IEC 60034-2-1 and USA standards IEEE 112/113

MEA Inertial Dynamometers

MEA solutions allow full dinamic and electric tests of all types and sizes of electric motors in few seconds and without the need of any braking systems (see how MEA works, pdf 1,4 MB).


The method is based on Newton’s law torque equation where:

where MOI is the Momentum of inertia wich is determined by the system itself


and dw/dt is the angular acceleration detected by a special speed sensor applied to the shaft or by an optical sensor pointed to the shaft or a rotating part of the motor


MEA system doesn’t use any torque sensor this allowing the system to be used for very small (milliwatts) to big motors (megawatts)

·     Supported Test


·     Additional test


·     System Accuracy


·     Full featured MEA inertial dynamometer for AC motors


·     Full featured MEA inertial dynamometer for Brushless motors


·     MEA portable predictive maintenance system for pumps and fans


·     Low-cost MEA inertial dynamometer with USB interface


See MEA international website






torque, speed, current, voltage, input power, output power, power factor, time, efficiency, frequency, direction of rotation

Speed and torque spectrum, speed and torque oscillations, friction torque, friction spectrum.

± 0.2%

C(t) = MOI * dw/dt

MotorTEST DB - Regenerative Active Dynamometers

Permit the detection of the electrical characteristics / dynamics and test the temperature of electric motors, single-phase and three-phase brushless direct curren

These dynamometers use an electric motor as a braking element controlled by a frequency converter (inverter) instead of an eddy-current brake allowing a very accurate control in speed and torque.

Also braking motor + converter can transform the mechanical energy of the motor under test into electrical energy that can be returned to the network or can be dissipated through a resistive element. Dynamic brakes are the best solution for every type of electric motor to power from 0,22 KW to 300 KW and speed of up to 8,000 RPM.


MotorTEST DB active regenerative dynamometers can be equipe with:

-   dissipative modules (braking resistances) instead of regenerative

-   inverter modules to allow testing of motors driven by an inverter

-   Variable power supply systems varying in voltage and frequency

-   professional instrumentation like power analyzers, milliohmeters, resistance meters

MotorTEST DB standard version from 0,22 KW up to 300 KW and 4.000 RPM                                 (see brochure – pdf, 536 KB).

MotorTEST DBH, high speed version varying up to 25000 RPM and power up to 62 KW (spingles, inverter-driven motors). Unlike standard DB dynamometer, MotorTEST DBH redirect energy coming from braking motor directly to converter that drives the motor under test, thus allowing savings more than 80% of nominal power. Plus the voltage applied to the motor under test can vary from 0 to 500 V (see brochure - pdf, 697 KB)

MotorTEST DBV for speed varying traction motors up to 10000 RPM and 50 KW -                            (see brochure – pdf, 633 KB)



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