JPS61224836A - Shaft supporting structure of high speed rotor - Google Patents

Abstract

PURPOSE:To prevent a bearing from electrically corroding without disturbing the dissipation of heat of a motor by supporting one support of the bearing of a rotor which rotates at a high speed by a high frequency motor through an insulating bush made of an electrically insulating material. CONSTITUTION:The upper and lower ends of a shaft 3 which passes a rotor 2 forming a motor with a stator 1 as a pair are rotatably supported by a pair of bearings 5, 6. The bearings 5, 6 are engaged through bearing cases 7, 8 and an O-ring 9 with a motor case 13 and a cover 14. A rotor 4 which rotates in vacuum unit is mounted on the upper end of the shaft 3. The bearig 5 is supported by the case 7 and a spring 12, the other end of the spring 12 is pressed by a cover 11 inserted with an insulating bush 10, and the cover 11 is secured to the case 13. Thus, the heat in the motor is dissipated externally through the shaft 3, the bearing 6, the case 8 and the cover 14, and even if a shaft voltage is generated, the bush 10 opens the electric closing circuit to prevent the bearings 5, 6 from electrically corroding.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a shaft support structure for a high-speed rotating body, and in particular to a structure in which a motor shaft, a bearing, and a main body are in contact with each other through conductive metal across a motor part. The present invention relates to a shaft support structure for a high-speed rotating body suitable for a structure forming a closed loop.

Background of the Invention] A conventional device (1), for example, as described in Japanese Unexamined Patent Publication No. 58-150096, uses a gas introduced from a nozzle to connect a ball bearing and a rotor of a motor to each other by gas introduced from a nozzle and led out from a seal. Some systems have protected ball bearings and lubricants from corrosion by constantly scavenging air, but no consideration has been given to damage to bearings caused by shaft voltage.

[Purpose of the invention]

The object of the present invention is to connect the parts connected to the outside of a high-speed rotating body having an electrical 111+ machine with metal and insert an electrical insulating material to the parts connected to the inside, thereby transferring heat generated inside to the outside by heat conduction. It is an object of the present invention to provide a shaft support structure for a high-speed rotating body, which allows the shaft voltage to be released and prevents damage to the bearing portion due to shaft voltage.

rSummary of the Invention] The present invention comprises a motor shaft provided with a rotor for an electric motor, a bearing incorporated in the motor shaft with a W rotor sandwiched therebetween, and
A bearing case that fits on the outside of the I-axis bearing.

a main body that supports one side of the bearing case and is provided with a stator for an electric motor; a bearing cover that supports the other side of the bearing and is attached and supported by the main body; one of the bearing cases, the main body, and the other side of the bearing case; and the bearing cover, a sealing material and a bushing are attached between the two, and the cover is attached to the main body and presses one side of the bearing case attached to the main body in the axial direction; A spring that is inserted between one side of the case and the cover and presses one side of the bearing case, and is a part that connects to the outside of a high-speed rotating body having an electric motor, and a part that connects to the inside of the high-speed rotating body having a metal contact. By intervening an electrical insulating material in the shaft, the heat generated inside can be released to the outside by thermal conduction, and the shaft of a high-speed rotating body can be prevented from being damaged by shaft voltage [Embodiment of the invention] Hereinafter, the invention One embodiment will be explained with reference to FIG. A certain rotor 4 is installed. The upper bearing 5 is
It is supported by a sealing material such as an O-ring 9 provided on the outer periphery of the bearing case 7 and a spring 12 provided at the top. The other end of the spring is a cover≠≠1 into which a non-conductor insulating bush 10 is inserted.
1, the presser foot n and the cover U are attached to the motor case 13 which is the main body. The lower bearing 6 is provided on the outer periphery of the bearing case 8 and supported by a sealing material such as an O-ring 9 and a cover 14 . Cover 14 is motor case l
It is attached to the The bearing case 8 is in surface contact with the cover 14. Go is in an outer case.

Isolate the inside from the outside.

With the above configuration, heat generated in the upper shaft 95 and the high-frequency motor section is transmitted through the motor shaft 3 to the lower bearing 6 on the atmospheric side.
．． The heat is transmitted to the bearing case 8 and the cover 14 and is cooled in the atmosphere. In addition, when shaft voltage is generated, the insulating bushing 10 that is in contact with the upper end of the spring spring that is in contact with the upper bearing 5
11. Motor shaft 3, bearings 5, 6, and bearing case 7.8
Since the closed loop composed of the cover 11, 14 and the motor case 13 is insulated and cut off, dielectric breakdown of the oil film in the bearings 5 and 6 can be prevented.

As described above, according to this embodiment, a high-frequency motor is used, and the motor is supported by an insulating bushing made of electrically insulating material on one support part of a bearing that supports a rotor that rotates at high speed in a vacuum. By lowering the heat conduction efficiency for dissipating heat within the case, it is possible to prevent scratches due to galvanic erosion of the bearing due to shaft voltage.

Although the rotor 4, which is a high-speed rotating body, is placed in a vacuum in this embodiment, it is not necessary to be in a vacuum.

〔Effect of the invention〕

According to the present invention, the heat generated inside is transferred to the outside by thermal conduction by bringing the island part into metal contact with the outside of a high-speed rotating body having an electric motor, and by intervening an electrical insulating material in the part connected to the inside. In addition to being able to release
This has the effect of preventing damage to the bearing due to shaft voltage.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a rotor support structure of an Otaka linked rotating body according to an embodiment of the present invention. 1... Stator, 2... Rotor, 3...
...Motor shaft, 4...Rotor, 5, 6...
...Bearing, 7.8 ...Bearing case, 9.
...0 ring, 10...insulation bushing. 11.14...cover, spring,
13...Motor case

Claims (1)

[Claims] 1. A motor shaft provided with a rotor for an electric motor, a bearing built into the motor shaft with the rotor in between, a bearing case that fits outside the bearing, and a stator for the electric motor that supports one side of the bearing case. a bearing cover that supports the other of the bearings and is attached and supported to the main body;
A sealing material inserted between one of the bearing cases and the main body and the other of the bearing cases and the bearing cover to seal the space between the two, and an insulating bushing attached to the main body. A shaft support structure for a high-speed rotating body, comprising: a cover that presses one side of the bearing case in the axial direction; and a spring that is inserted between the one side of the bearing case and the cover and presses the one side of the bearing case.