JP2004336889A - Vacuum motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacuum motor easy in manufacturing, small in loss caused by an eddy current and reduced in gas discharge. <P>SOLUTION: In a non-wrapped concentrated winding motor having a magnetic field magnet, thin inner joining parts are formed at gap-facing sides of a stator core, stator teeth are integrated by the inner joining parts, surface coatings such as Ni plating are applied to the gap-facing sides of the inner joining parts of the stator teeth; a coil pre-wound to the stator teeth is installed with a stator yoke and the stator teeth as separate pieces; and after that, the teeth and the yoke are integrated by shrink fitting or the like, thus constituting a stator. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a can device in which a stator of a vacuum motor is sealed.
[0002]
[Prior art]
A conventional vacuum motor will be described with reference to the drawings. FIG. 4 is a sectional view of a conventional vacuum motor. In the figure, reference numeral 100 denotes a motor-side frame, and a motor-side stator 2 is provided on the inner periphery of the frame 100. 104 is a bracket fixed to the frame 100; 106 is a support seat provided on the inner periphery of the frame 100 and fixed to the inner end surface of the bracket 104; 101 is a flange fixed to the frame 100; A cylindrical can 107 formed by cutting a cylindrical body from the cylindrical body is fixed between the can 107 and the motor-side stator. Reference numeral 109 denotes a detector-side frame. The detector-side stator 102 is provided on the inner periphery of the frame 109. 105 is a bracket fixed to the end face of the frame 109; 108 is a support seat provided inside the bracket 105 and fixed to the inner periphery of the frame 109; 103 is a flange fixed to the frame 109; A can 110 is fixed between the support seat 108 and the stator 102 on the detector side in a sealed state. The detector-side flange 103 configured as described above is fixed to the motor-side flange 101, and the detector is connected to the motor (for example, see Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 9-247887
[Problems to be solved by the invention]
However, the conventional vacuum motor has a problem in that since the can is made of metal such as stainless steel, an eddy current flows through the can, generating iron loss and a viscous braking torque associated therewith, resulting in an increase in loss. Further, since the can is usually manufactured by cutting from a thick pipe, the number of processing steps increases. In addition, since the can and the stator core are separate bodies, there have been problems such as deterioration of mounting accuracy and an increase in man-hours.
The present invention has been made to solve such a problem, and an object of the present invention is to provide a vacuum motor which is easy to manufacture, has a small loss due to eddy current, and has a small outgassing.
[0005]
[Means for Solving the Problems]
To solve the above problems, the present invention is configured as follows.
According to a first aspect of the present invention, in the non-overlapping concentrated winding motor of the permanent magnet field, a thin inner connecting portion is provided on the gap opposing surface of the stator core, and the stator teeth are integrated at the inner connecting portion, and the stator teeth inner connecting portion is provided. After applying a surface coating such as Ni plating on the surface facing the gap, mounting a coil pre-wound on the stator teeth with the stator yoke and stator teeth as separate pieces, then integrating the stator teeth and stator yoke by shrink fitting etc. Is constituted.
According to a second aspect of the present invention, the stator core according to the first aspect is formed by pressing a soft magnetic metal powder such as pure iron or 3% SiFe.
According to a third aspect of the present invention, the stator core according to the first aspect is configured by laminating silicon steel plates.
According to a fourth aspect of the present invention, there is provided a permanent magnet type non-overlapping concentrated winding motor having a rotor rotatably supported by a bearing of a bracket fixed to a frame and a stator according to the first aspect fixed to the frame. The bracket is provided with an overhang having the same diameter as the diameter of the gap surface of the stator tooth connecting portion, and the overhang and the stator tooth connecting portion are brought into close contact with each other.
According to a fifth aspect of the present invention, there is provided a permanent magnet type non-overlapping concentrated winding motor having a rotor rotatably supported by bearings of a bracket fixed to a frame and a stator according to the first aspect fixed to the frame. The bracket is provided with an overhang having the same diameter as the diameter of the gap surface of the inner joint portion of the stator teeth, and the overhang and the inner joint portion of the stator teeth are closely attached via a gasket or an O-ring. is there.
According to a sixth aspect of the present invention, the outer periphery of the soft magnetic metal powder according to the second aspect is provided with an insulating coating.
According to a seventh aspect of the present invention, in the non-overlapping concentrated winding motor having the field permanent magnet, a thin inner connecting portion is provided on the gap opposing surface of the stator core, and the stator teeth are integrated by the inner connecting portion, and the stator yoke and the stator are integrated. With the teeth as a separate piece, a coil pre-wound on a bobbin made of an insulator is mounted on the stator teeth, and after wiring, the stator teeth and the stator yoke are integrated by shrink fitting, etc., and the whole is molded with insulating resin Then, the stator is formed by further applying a surface coating such as Ni plating.
As described above, according to the present invention, a surface coating such as Ni plating is applied to the gap opposing surface of the inner joint portion of the stator teeth, and the bracket and the inner joint portion are brought into close contact with each other, so that the can of the stator portion has the surface coating. The inner connecting portion can be used as a substitute, and the coil end can can be replaced with the overhang portion of the bracket, so that gas emission can be suppressed without mounting a conventional can. In addition, the thickness of the surface coating such as plating is usually several tens μm or less, which is thinner than that of the can, so that iron loss and viscous braking torque can be significantly reduced.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a front sectional view of the vacuum motor of the present invention. In the drawing, reference numeral 1 denotes a motor frame, and a motor stator 2 is fixed to the inner periphery of the frame by shrinkage fitting. The motor stator 2 is composed of two parts, a stator yoke 21 and a stator tooth 22, and an inner connecting portion 16 for connecting the teeth to each other is provided on the gap opposing surface of the stator tooth 22. After inserting the coil 17 wound around a bobbin (not shown) from the outer periphery of the stator teeth 22, the stator yoke 21 is fixed to the outer periphery of the stator teeth 22, and the resin 11 is molded. Further, a surface coating 12 such as electroless Ni plating is applied to the outer periphery of the stator for the purpose of suppressing gas release in a vacuum.
Next, the configuration of the motor will be described with reference to FIG. FIG. 2 is a side sectional view of the first embodiment of the present invention. The stator 2 described with reference to FIG. 1 is fixed to the frame 1, and brackets 5 are fixed to both ends of the frame 1 with screws (not shown). Reference numeral 51 denotes an L-side bracket, and 52 denotes an opposite L-side bracket. A bearing 9 is mounted on the bracket 5, and the shaft 8 is rotatably supported on the stator via the bearing 9. Reference numeral 91 denotes an L-side bearing, and 92 denotes an anti-L-side bearing. The permanent magnet 4 is fixed to the surface of the rotor yoke 10 with an inorganic adhesive so as to form a predetermined number of poles. The rotor yoke 10 is attached to the shaft 8 such that the permanent magnet 4 faces the stator via the gap 19. ing. The leaf spring 7 is inserted between the opposite L-side bracket 52 and the opposite L-side bearing 92 to apply a thrust pressure to the bearing.
Next, the detector will be described. In this embodiment, a magnetic encoder is used as a detector. Reference numeral 3 denotes a magnetic sensor which is fixed to the opposite L-side bracket. The encoder disk 6 is mounted on a holder 18 so as to face the magnetic sensor 3, and the position information of the motor and the magnetic pole position are detected by fixing the holder 18 to a shaft. Reference numeral 15 denotes an encoder cover fixed to the opposite L bracket 52. Since the surface coating 12 is applied to the inner connecting portion 16 of the stator core and the resin 11 as described above, gas emission in a vacuum can be suppressed.
[0007]
(Second embodiment)
FIG. 3 is a side sectional view of the second embodiment. In the drawing, reference numeral 1 denotes a motor frame, and a motor stator 2 is fixed to the inner periphery of the frame by shrinkage fitting. The motor stator 2 is formed by applying an insulating coating to the outer periphery of a soft magnetic metal powder such as pure iron or 3% SiFe and press-molding the soft magnetic metal powder. The motor stator 2 is composed of a stator yoke 21 and a stator tooth 22. An inner connecting portion 16 for connecting the teeth to each other is provided on the gap opposing surface of the stator teeth 22. The stator teeth 22 are previously provided with a surface coating 12 such as electroless Ni plating for the purpose of suppressing gas emission, and after inserting the coil 17 wound around a bobbin (not shown) from the outer periphery of the stator teeth 22, The stator yoke 21 is fixed to the outer periphery of the stator teeth 22 by shrink fitting and molded with the resin 11. Brackets 5 are fixed to both ends of the frame 1 with screws (not shown). Reference numeral 51 denotes an L-side bracket, and 52 denotes an opposite L-side bracket. An overhang 20 is formed integrally with the bracket 5, and the overhang 20 and the stator teeth 22 are in close contact with each other via a gasket 13. Further, an O-ring 14 is attached to a fitting portion between the frame 1 and the bracket 5. This seals the stator. A bearing 9 is mounted on the bracket 5, and the shaft 8 is rotatably supported on the stator via the bearing 9. Reference numeral 91 denotes an L-side bearing, and 92 denotes an anti-L-side bearing. The permanent magnet 4 is fixed to the surface of the rotor yoke 10 with an inorganic adhesive so as to form a predetermined number of poles. The rotor yoke 10 is attached to the shaft 8 such that the permanent magnet 4 faces the stator via the gap 19. ing. The leaf spring 7 is inserted between the opposite L-side bracket 52 and the opposite L-side bearing 92 to apply a thrust pressure to the bearing.
Next, the detector will be described. In this embodiment, a magnetic encoder is used as a detector. Reference numeral 3 denotes a magnetic sensor which is fixed to the opposite L-side bracket. The encoder disk 6 is mounted on a holder 18 so as to face the magnetic sensor 3, and the position information of the motor and the magnetic pole position are detected by fixing the holder 18 to a shaft. Reference numeral 15 denotes an encoder cover fixed to the opposite L bracket 52. Since the surface coating 12 is applied to the gap surface of the inner connecting portion 16 of the stator teeth 22 and the stator is hermetically sealed by the overhang 20 of the bracket 5 and the gasket 13, gas emission in a vacuum can be suppressed.
[0008]
【The invention's effect】
As described above, according to the vacuum motors shown in the first and second embodiments of the present invention, the following effects can be obtained.
(1) Outgassing in a vacuum can be reduced without using a can structure.
(2) Since the surface coating such as Ni plating has a thickness of several tens μm or less, which is much thinner than the can, the iron loss and the viscous braking torque can be reduced as compared with the can.
(3) Dimensional accuracy is higher than can and can be realized at low cost.
(4) Since the strength is higher than that of the can, deformation due to pressure change is small.
[Brief description of the drawings]
FIG. 1 is a front sectional view of a vacuum motor of the present invention. FIG. 2 is a side sectional view of a vacuum motor showing a first embodiment of the present invention. FIG. 3 is a side sectional view of a vacuum motor showing a second embodiment. 4 Side sectional view of a conventional vacuum motor [Explanation of symbols]
1 Frame 2 Motor Stator 3 Magnetic Sensor 4 Magnet 5 Bracket 6 Encoder Disk 7 Leaf Spring 8 Shaft 9 Bearing 10 Rotor Yoke 11 Resin 12 Surface Coating 13 Gasket 14 O-ring 15 Encoder Cover 16 Inner Connection 17 Coil 18 Holder 19 Gap 20 Overhang 21 Stator yoke 22 Stator teeth 51 L bracket 52 Anti-L bracket 91 L-side bearing 92 Anti-L side bearing 100 Motor side frame 101 Motor side flange 102 Detector stator 103 Detector side flange 104 Motor bracket 105 Detector bracket 106 Motor side support Seat 107 Motor can 108 Detector side support seat 109 Detector side frame 110 Detector side can

Claims (7)

In a non-overlapping concentrated winding motor having a field permanent magnet,
A thin inner connecting portion is provided on the gap opposing surface of the stator core, the stator teeth are integrated at the inner connecting portion, a surface coating such as Ni plating is applied to the gap opposing surface of the stator tooth connecting portion, and the stator yoke and the stator teeth are attached. A vacuum motor characterized in that a stator is formed by attaching a pre-winded coil to a stator tooth as a separate piece, and then integrating the tooth and yoke by shrink fitting or the like. 2. The vacuum motor according to claim 1, wherein the stator core is formed by press-molding soft magnetic metal powder. 2. The vacuum motor according to claim 1, wherein said stator core is formed by laminating silicon steel plates. A permanent magnet type non-overlapping concentrated winding motor having a rotor rotatably supported by bearings of a bracket fixed to a frame and a stator fixed to the frame, and having a diameter equal to a diameter of a gap surface of a connecting portion in a stator tooth. 2. The vacuum motor according to claim 1, wherein the bracket has an overhang having a diameter of the bracket, and the overhang and the connecting portion in the stator teeth are brought into close contact with each other. A permanent magnet type non-overlapping concentrated winding motor having a rotor rotatably supported by bearings of a bracket fixed to a frame and a stator fixed to the frame, and having a diameter equal to a diameter of a gap surface of a connecting portion in a stator tooth. 2. The vacuum motor according to claim 1, wherein the bracket has an overhang having a diameter of: and the inner connection portion between the overhang and the stator teeth is closely attached via a gasket or an O-ring. The vacuum motor according to claim 2, wherein an insulating coating is applied to an outer periphery of the soft magnetic metal powder. In a non-overlapping concentrated winding motor having a field permanent magnet,
A thin inner connecting portion is provided on the gap opposing surface of the stator core, the stator teeth are integrated at the inner connecting portion, and a stator yoke and a stator tooth are separately formed, and a coil prewinded on a bobbin made of an insulator is used as the stator tooth. After connecting, the stator teeth and stator yoke are integrated by shrink-fitting, etc., the whole is molded with insulating resin, and the surface coating such as Ni plating is applied to form the stator. For motor.

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