| 摘要 |
PROBLEM TO BE SOLVED: To improve detection precision without influence of a change in the load of a canned motor 32 on the detection of the axial wear of bearings 48a, 48b by improving the detection sensitivity of radial wear of the bearings 48a, 48b. SOLUTION: A rotor groove 41 in a rotor 43 of a canned motor 32 is formed so as to be axially-parallel, or the tilting of the rotor groove 41 is eliminated. From the radial and axial displacement of the rotor 43, the radial and axial wear to bearings 48a, 48b are monitored based on the output signals of radial detection coils 62a, 62b and axial detection coils 69a, 69b formed at a stator 37. By eliminating the influence of the tilting of the rotor groove 41, it is possible to improve the detection sensitivity of the radial wear of the bearings 48a, 48b and the detection precision of the axial wear thereof without influence of a change in the load of the canned motor 32 on the detection of the axial wear to the bearings 48a, 48b. |
