Patent ID: 8990031
Filing Date: 2015-03-24
Classification: G01H

Abstract:
1. A torsional resonance frequency measuring device, comprising: a power equipment with a rotating member; a three-phase permanent magnet synchronous generator (PMSG) having a three-phase stator winding and a rotor, the three-phase stator winding including a first-phase stator winding, a second-phase stator winding and a third-phase stator winding; a control unit; and a machine-side converter connected to the three-phase stator winding, the machine-side converter further being connected to the control unit, wherein the control unit controls the machine-side converter to wherein the control unit acquires back electromotive force generated on the third-phase stator winding of the three-phase stator winding due to the mechanical excitation of the rotor so as to calculate a torsional resonance frequency of the power equipment with the rotating member according to a frequency spectrum of the back electromotive force, wherein the orienting currents are output such that a current of the first-phase stator winding is I further wherein the pulse currents are output so that the current of the first-phase stator winding is I further wherein I