Rotating electrical machine and diagnostic method for the same

A rotating electrical machine comprising:

• a stator;
• a rotor disposed on an inner side of the stator with a predetermined gap
• a data storage device;
• a data operation device;
• and
• a measurement control device,
• wherein the stator includes vibration measuring accelerometers, each of the vibration measuring accelerometers placed on each of at least two members included in the stator, the members having different displacements or phases with each other;
• and
• wherein the data operation device acquires a relative displacement of one of the members included in the stator, from the data storage device, by evaluating a difference between displacements or phases measured by the vibration measuring accelerometers and the measurement control device that has a predetermined threshold,
• wherein the vibration measuring accelerometers include a vibration measuring accelerometer A placed on a member of the at least two members regarded as a movable body and a vibration measuring accelerometer B placed on a member of the at least two members regarded as a fixed body,
• wherein the vibration measuring accelerometers measure the difference between a displacement or a phase measured by the vibration measuring accelerometer A and a displacement or a phase measured by the vibration measuring accelerometer B,
• wherein the vibration measuring accelerometers defines the difference as a displacement of the member regarded as the movable body,
• wherein the stator includes a stator core, a stator coil wound in a slot of the stator core, a wedge that fixes the stator coil into the slot, and a stator frame that supports and fixes the stator core,
• wherein the stator includes a stator coil-end where the stator coil wound in the slot protrudes from an axial-direction end of the stator core in an axial direction,
• wherein the vibration measuring accelerometer A is placed on the stator coil that is the member regarded as the movable body, the stator coil being at a slot outlet of the stator core,
• wherein the vibration measuring accelerometer B is placed on the stator core that is the member regarded as the fixed body,
• wherein the rotating electrical machine acquires a difference between displacements or phases measured by the vibration measuring accelerometer A and the vibration measuring accelerometer B, and defines the difference as a displacement of the stator coil at the slot outlet of the stator core,
• wherein the data storage device is connected to the vibration measuring accelerometer A and the vibration measuring accelerometer B, and stores vibration data which includes the displacement or the phase measured by the vibration measuring accelerometer A and the displacement or the phase measured by the vibration measuring accelerometer B,
• wherein the data operation device that operates the difference from vibration data sent from the data storage device, and
• wherein the measurement control device that evaluates the difference sent from the data operation device depending on whether the difference as the operated data sent from the data operation device exceeds the threshold.