3 High-Power Test

A high power test was performed at a Wolfspeed lab using the E-motor emulator (E-ME) from AVL. E-motor emulator gives an option to choose between different motor types with the mathematical model specified from the user’s side. The mathematical model can be linear or non-linear. Since E-ME emulates the behavior of the real motor, E-ME also contains the emulators which emulate the position feedback. In this high power test, a non-linear PMSM motor parameters and resolver emulator were used. TI developed the closed-loop motor control algorithm to work in torque mode. The torque command was sent from the PC, while the speed command was provided from the TCP Client (AVL GUI) directly to the E-ME. This control system is shown visually in Figure 3-1.

In Figure 3-2, the E-ME cabinet is shown as a part of AVL setup where the inverter was physically placed and connected. The Yokogawa WT5000 power analyzer and Tektronix 5-Series oscilloscope were used for monitoring the signals and collecting the measurement data.