| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a motor-integrated magnetic bearing device in which the long term durability of rolling bearings for a thrust load can be improved, which is compact and can cope with high-speed rotation, and in which the motor can be cooled by a simple structure. <P>SOLUTION: In this motor-integrated magnetic bearing device, a main shaft 13 is supported by the rolling bearing and a magnetic bearing. An electromagnet 17 forming the magnetic bearing is attached to a spindle housing so as to contactlessly oppose thrust plates 13a, 13b provided on the main shaft 13. A motor cooling flow path penetrating through a portion where a motor 28 is disposed is provided on the spindle housing. The motor cooling flow path includes a gap generated between the thrust plates 13a, 13b and the members 17, 28b opposing the thrust plates 13a, 13b. A motive pressure groove 44 is provided on the surfaces of members 17, 28b opposing the thrust plates 13a, 13b where they oppose the thrust plates 13a, 13b. The motor cooling flow path is interposed in a refrigerant flow path of a refrigeration cycle device. <P>COPYRIGHT: (C)2009,JPO&INPIT |
