Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1998-10-28
2000-09-05
Hofsass, Jeffery A.
Communications: electrical
Condition responsive indicating system
Specific condition
73119R, 73462, 340648, 3406861, 3406863, G08B 2100
Patent
active
061149667
ABSTRACT:
A motor is provided in which zero-point positioning of the stator and rotor in the axial direction is simple. The operation of replacing the rotor or stator can be done easily. A motor is provided in which zero-point positioning of the stator and rotor in the axial direction is simple and the detection precision can be improved. In a canned motor, a bearing wear monitoring device monitors the wear of the bearings that supports the rotor. The wear of the bearings is determined by measuring the displacement of the rotor based on the output signal of detection coils that are provided in embedding core units on both axial ends of the stator. The center of the embedding core unit at one axial end of the stator and the end face of one axial end of the stator are positioned to coincide with one another. The other axial end of the rotor is made to protrude outside the embedding core unit of the other axial end of the stator by a prescribed dimension. The output voltage of the detection coil at the other axial end is kept to a constant value. The detection coils at the axial ends of the stator produce a differential output voltage corresponding to the wear of the bearings.
REFERENCES:
patent: 3981621 (1976-09-01), Considine
patent: 4334189 (1982-06-01), Sato
patent: 4539499 (1985-09-01), Punch et al.
patent: 4584865 (1986-04-01), Hutchins
patent: 5805080 (1998-09-01), Lemoine et al.
Hofsass Jeffery A.
Nikkiso Co. Ltd.
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