Torsional modal analysis of single shaft systems containing permanent magnet synchronous motors using novel broadband torque excitation

摘要

The growing demand in the automotive industry for high performance DC motor drives is more and more satisfied using permanent magnet synchronous motors. Naturally the development and testing of these motors require - beside others - sophisticated experimental torsional modal analysis techniques. In this paper a novel torsional modal analysis method is presented, which is based on a unique broadband torque excitation that is provided by a permanent magnet synchronous motor. As in tipical cases the synchronous motor is also part of the investigated mechanical system no additional external excitation is required. Another great advantage of this excitation method is that the investigated system does not have to rotate during the measurements, therefore no special torsional vibration instrumentation is needed, so standard accelerometers and modal analysis software can be used for the data aquisition and for the mode shape extration too.