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Magnetic bearing deviceMagnetic bearing device description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060163962, Magnetic bearing device. Brief Patent Description - Full Patent Description - Patent Application Claims
TECHNICAL FIELD [0001] The present invention relates to a magnetic bearing apparatus which is to be used in a spindle unit of a machine tool or the like, and more particularly to a cooling structure for such a magnetic bearing apparatus. BACKGROUND ART [0002] Usually, a magnetic bearing apparatus is used for the primary purpose of realizing ultrahigh speed rotation which is hardly realized by a rolling bearing apparatus that is conventionally widely used. As compared with a rolling bearing apparatus, in a magnetic bearing apparatus, ultrahigh speed rotation is enabled, but it is usual that the main unit of the bearing apparatus generates a large amount of heat because of an increased number of electrical components. In a conventional countermeasure for cooling a magnetic bearing apparatus, for example, air is supplied from the outside into a unit by a compressor or the like, and the supplied air flow is passed over the surface of a rotary shaft to conduct a cooling operation. Such a cooling structure for a magnetic bearing apparatus is disclosed in, for example, JP-A-8-61366. [0003] In the above-described cooling structure, however, the air flow which is close to the ambient temperature is simply circulated from the outside into the unit. Therefore, the structure has problems in that the cooling performance is not excellent, and that apparatuses (such as a compressor) for supplying the air flow from the outside into the unit are additionally required and hence the scale of cooling facilities becomes large. DISCLOSURE OF THE INVENTION [0004] The invention has been conducted in order to solve the above problems. It is an object of the invention to obtain a magnetic bearing apparatus in which a large cooling effect can be exerted by a simple configuration. [0005] In order to attain the object, the invention is configured so as to comprise: cooling wind producing means for producing cooling wind of a low temperature with using a driving force of a rotary member; and a cooling wind flow path through which the low-temperature cooling wind produced by the cooling wind producing means is to flow into a magnetic bearing apparatus. [0006] The cooling wind producing means comprises: high-speed air flow producing means for producing a high-speed air flow with using the driving force of the rotary member; converting means for converting the high-speed air flow produced by the high-speed air flow producing means, to a vortex flow; an air flow path through which the high-speed vortex flow converted by the converting means is to flow; and a control valve which is disposed on a side of the air flow path opposite to the converting means. [0007] The low-temperature cooling wind is produced with using ultrahigh speed rotation of the rotary member. Therefore, it is possible to obtain a magnetic bearing apparatus in which a large cooling effect can be exerted by a simple configuration. [0008] Alternatively, the magnetic bearing apparatus comprises: cooling wind producing means that produces cooling wind of a low temperature, and that has: fins which are disposed on a rotary shaft, and which produces an axial air flow by a driving force of the rotary shaft; a generator which is fixed with forming a predetermined gap with respect to the fins, and which produces a high-speed vortex flow; a tube through which the high-speed vortex flow produced by the generator is to flow; and a control valve which is disposed on a side of the tube opposite to the generator; and a cooling wind flow path through which the low-temperature cooling wind produced by the cooling wind producing means is to flow into the magnetic bearing apparatus. [0009] The low-temperature cooling wind is produced with using ultrahigh speed rotation of a rotary member. Therefore, it is possible to obtain a magnetic bearing apparatus in which a large cooling effect can be exerted by a simple configuration. [0010] The cooling wind flow path is disposed in the rotary shaft portion so as to axially elongate. [0011] Therefore, the rotary shaft portion can be efficiently cooled. [0012] The cooling wind flow path has: a cooling wind flow path disposed in the case; and a pipe which guides the low-temperature cooling wind to the cooling wind flow path disposed in the case. [0013] Therefore, not only the rotary shaft portion, but also the whole of the magnetic bearing apparatus can be efficiently cooled. [0014] Alternatively, the magnetic bearing apparatus comprises: cooling wind producing means that produces cooling wind of a low temperature, and that has: fins which are disposed on an axial magnetic bearing disc, and which produces an air flow directed in an outer radial direction of the axial magnetic bearing disc; a supply port which is positioned in an outer circumferential portion of the fins, and through which the air flow produced by the fins is introduced and ejected as a high-speed air flow in the outer radial direction; a generator which converts the high-speed air flow ejected from the supply port, to a vortex flow; an air flow path through which the high-speed vortex flow produced by the generator is to flow; and a control valve which is disposed on a side of the air flow path opposite to the generator; and a cooling wind flow path through which the low-temperature cooling wind produced by the cooling wind producing means is to flow into the magnetic bearing apparatus. [0015] The low-temperature cooling wind is produced with using ultrahigh speed rotation of a rotary member. Therefore, it is possible to obtain a magnetic bearing apparatus in which a large cooling effect can be exerted by a simple configuration. Among portions of rotary portions, particularly, the axial magnetic bearing disc has the largest outer diameter, and hence the largest cooling effect is attained as compared with cases where a high-speed vortex flow is produced by other portions. [0016] A guide portion which guides the low-temperature cooling wind to a rotary shaft portion is disposed. [0017] The cooling wind flow path has: a cooling wind flow path which is disposed in the case, and through which the low-temperature cooling wind produced by the cooling wind producing means is to flow; a guide plate which guides the cooling wind that has been passed through the cooling flow path, to a rotary shaft portion; and a cooling wind flow path which is disposed in the rotary shaft portion, and through which the cooling wind that has been guided by the guide plate is to axially flow, thereby cooling the rotary shaft portion. [0018] Therefore, also the rotary shaft portion can be efficiently cooled, and the whole of the magnetic bearing apparatus can be efficiently cooled. [0019] Alternatively, the magnetic bearing apparatus comprises: cooling wind producing means that produces cooling wind of a low temperature, and that has: fins which are disposed on an axial magnetic bearing disc, and which produces an air flow directed in an outer radial direction of the axial magnetic bearing disc; an air suction port which is positioned in an outer circumferential portion of the fins, and through which the air flow produced by the fins is introduced and ejected as a high-speed air flow in the outer radial direction; an air flow path through which the high-speed air flow ejected from the air suction port is to flow; a generator which converts the high-speed air flow ejected from the air flow path, to a vortex flow; a tube through which the high-speed vortex flow produced by the generator is to flow; and a control valve which is disposed on a side of the tube opposite to the generator; and a cooling wind flow path through which the low-temperature cooling wind produced by the cooling wind producing means is to flow into the magnetic bearing apparatus. [0020] The low-temperature cooling wind is produced with using ultrahigh speed rotation of a rotary member. Therefore, it is possible to obtain a magnetic bearing apparatus in which a large cooling effect can be exerted by a simple configuration. BRIEF DESCRIPTION OF THE DRAWINGS Continue reading about Magnetic bearing device... Full patent description for Magnetic bearing device Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Magnetic bearing device patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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