The SPS E-Motor Emulator (EME)

Testing without e-motors. With an e-motor emulator.

„One device. For almost all test objectives.“

Inverter tests are possible under full power in a laboratory environment. SPS Smart Power Systems offers e-motor emulators depending on the application and power class: From low voltage for the emulation of typical steering-servo motors, pumps or auxiliary motors; to high power emulators for the emulation of electric motors with over 1,000A phase current.

New PHiL technology – for holistic inverter testing

  • No change to the test object
  • Test of the complete inverter electronics with original HW/SW
    (ISO 26262)
  • No mechanical limitations
  • Practically unlimited fault stimulation possibilities
  • Correct power flow

Simulated mechanics. Real electrical power.

Our emulator provides model-based emulation of an e-motor. The specific characteristics of the motor are set using parameters. The model is fed measured connection voltages and phase currents. The model then calculates the control values for the high performance phase amplifier. The electrical power flows exactly as for a real motor, safe, real. The mechanical world is simulated in real-time. Now tests on the drive inverter are possible with full power but without mechanical limitation. The EME does not influence the mechanics. Hence the mechanical behaviour can be exactly simulated in real-time while the e-motor is emulated on the phase connections of the drive inverter.

 Model-based: the e-motor is a software model

The SPS e-motor emulator can emulate different basic types of e-motor via software. The user can define the electrical, magnetic and mechanical data for the specific e-motor such as impedance, pole-pair number, magnetic flow, inertial mass and friction in the graphical user interface. Control values such as the rotor position, speed or torque can be set to the virtual motor via the user interface. Of particular interest: All control values and motor parameters can be changed at runtime, even very dynamically. This is virtual reality – but with full electrical power! Incidentally, in an invert test stand, the energy flows in a circuit. Only the losses are taken from the grid. Different power, current and voltage classes are available, depending on the application.

Typical applications 12 V/1 kW

  • Pumps
  • Electric brakes
  • Steering servos
  • Fans

Typical applications 200 … 1000 V/20 … 350 kW

  • Electric powertrain/hybrid
  • Formula 1 – MGUK/MGUH
  • Off-road
  • Electric turbocharger
  • Fuel cell ventilation