Educational Power Logger for Electrical Machines Laboratory Experiments

Measurements in electrical machines and drives laboratory for undergraduate and graduate courses are mostly carried out using dedicated oscilloscopes. Important in electric drive experiments, is the visualization of three-phase voltages and currents. However, visualization of two-phase vector quantities is more intuitive, especially when displayed as two-dimensional graphs. A hexagon showing the voltage vector and circle showing the current is more intuitive, than six sinusoidal waveforms. In this paper a low-cost measurement device is presented, for direct transformation of the three-phase voltages and currents into two-phase signals that can be displayed on a XY-oscilloscope.