JPH0253268U

JPH0253268U -

Info

Publication number: JPH0253268U
Application number: JP13144288U
Authority: JP
Priority date: 1988-10-07
Filing date: 1988-10-07
Publication date: 1990-04-17

Description

[Brief explanation of drawings]

第１図乃至第３図は本考案の一実施例を示した
もので、第１図は全体の縦断面図、第２図は第１
の磁性シール部分の下面図、第３図は第２の磁性
シール部分の拡大縦断面図であり、そして、第４
図は従来例を示す第１図相当図である。図面中、１１はブラケツト、１１ａは軸嵌合筒
部、１２は固定軸、１３はケーシング、１５は軸
受、１７はステータコア、１８は電機子コイル、
１９はステータ、２２は軸受、２５はロータ、２
８はロータマグネツト、２９は第１の磁性シール
、３０は磁性シール用磁石、３１及び３２は環状
磁性板、３４は非導電性の磁性流体、３９は第２
の磁性シール、４０は磁性シール用磁石、４１及
び４２は環状磁性板、４３は導電性の磁性流体で
ある。 Figures 1 to 3 show one embodiment of the present invention, with Figure 1 being a longitudinal cross-sectional view of the whole, Figure 2 being
FIG. 3 is an enlarged vertical sectional view of the second magnetic seal portion, and FIG.
The figure is a diagram corresponding to FIG. 1 showing a conventional example. In the drawing, 11 is a bracket, 11a is a shaft fitting cylinder part, 12 is a fixed shaft, 13 is a casing, 15 is a bearing, 17 is a stator core, 18 is an armature coil,
19 is a stator, 22 is a bearing, 25 is a rotor, 2
8 is a rotor magnet, 29 is a first magnetic seal, 30 is a magnetic seal magnet, 31 and 32 are annular magnetic plates, 34 is a non-conductive magnetic fluid, and 39 is a second magnetic seal.
40 is a magnetic seal magnet, 41 and 42 are annular magnetic plates, and 43 is a conductive magnetic fluid.

Claims

[Scope of utility model registration request]

a fixed shaft having both ends fixed; a stator fixed to the fixed shaft; a cylindrical rotor rotatably supported by the fixed shaft via a bearing and surrounding the stator; A first magnetic seal that closes a gap between the shaft-fitting cylindrical portion of the bracket whose one end is fitted and fixed and one end opening of the rotor, and a first magnetic seal that closes a gap between the other end opening of the rotor and the fixed shaft. and a second magnetic seal that closes the gap, the first magnetic seal is filled with a non-conductive magnetic fluid, and the second magnetic seal is filled with a conductive magnetic fluid. An external rotary motor characterized by being filled with.