Patent ID: 11901853
Assignee: nan
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A computer system implemented method for determining rotation of a de-energized electric machine without accessing the machine, wherein the machine in the energized state rotates in a reference direction, the method comprising:
detecting by the computer system, for a recorded waveform of multi-phase electrical power indicia for supply conductors of the machine measured remotely from the machine, that a first time segment of the recorded waveform corresponds to an electrically energized state of the machine and that a second time segment of the recorded waveform corresponds to an electrically de-energized state of the machine, wherein since the second time segment of the recorded waveform is for the de-energized state, the second time segment is for times when the recorded waveform arises from power induced on the supply conductors for the machine by rotation of the machine; and
determining by the computer system that the machine in the de-energized state has rotated in a direction reverse to the reference direction, wherein the determining that the machine in the de-energized state has rotated in a direction reverse to the reference direction includes the computer system comparing the first and second time segments of the recorded waveform.