Instrument holder and method for inspection of a dynamo-electric machine in a gap between a stator and a rotor and dynamo-electric machine having the instrument holder

A dynamo-electric machine, comprising:

• a) a stator having a ferromagnetic yoke with an internal recess and a rotor disposed in said internal recess defining a gap between said yoke and said rotor;
• and
• b) an instrument holder to be introduced into said gap for inspecting the dynamo-electric machine, said instrument holder including:
• b1) a frame section and instruments secured to said frame section for inspecting the dynamo-electric machine;
• b2) at least one wheel set having at least three wheels for moving said instrument holder in said gap, approximately mutually parallel axes, each of said wheels being rotatable about a respective one of said axes, and each of said wheels having a suspension;
• b3) a connection device to be connected to leads for connecting the instrument holder to a control and evaluation device;
• and
• b4) at least one magnet for pressing said wheels of the instrument holder against said yoke in said gap.

A method for inspecting a dynamo-electric machine including a stator having a ferromagnetic yoke with an internal recess and a rotor disposed in the internal recess defining a gap between the yoke and the rotor, which comprises:

• introducing an instrument holder, carrying means for inspecting the machine, into the gap;
• rolling the instrument holder on the yoke with wheels each supported on the instrument holder by respective suspensions;
• and
• pressing the instrument holder against the yoke with at least one magnet.