JPH0763209B2 - Structure and mounting method of resin can for motor - Google Patents

Description

TECHNICAL FIELD The present invention relates to a canned motor having a resin can, which reduces the can and loss based on the can and has high efficiency, high pressure resistance, and high corrosion resistance. It is intended to form an excellent canned motor.

"Prior Art" Generally, in a canned motor, a hollow cylindrical can 4 is closely fitted to a stator core in a gap 5 between a stator 2 and a rotor 3 of a motor 1 as shown in FIG. A drive shaft of a driven body such as a compressor or a pump 6 serving as a load and a rotary shaft of the motor are combined and hermetically sealed with the drive shaft, and leakage of fluid from a penetrating portion of the drive shaft of the load 6 is prevented by the motor. The can 4 surrounding the rotor 3 shuts off the air and isolates it from the outside air, thus completely eliminating leakage.

[Problems to be Solved by the Invention] However, the magnetic flux of the stator 2 passes through the air gap 5 between the stator 2 and the rotor 3 into which the can 4 is inserted. This air gap directly affects the electric characteristics of the motor. It will have a big impact and will be a very important part. Since the can 4 exists in the gap 5, the gap length increases by at least the thickness of the can 4, and the exciting current of the motor increases remarkably, resulting in copper loss, and when the can 4 is a metal plate. Due to its conductivity, a closed circuit is formed in the surface of the can 4, and an overcurrent flows due to the AC magnetic flux, resulting in an overcurrent loss. Due to the loss of both of them, the efficiency of the canned motor is remarkably lowered, and it becomes difficult to design a large capacity in terms of cooling against the generated heat loss.

For this reason, the can 4 made of a soft magnetic material having a high magnetic permeability apparently reduces the air gap with respect to the increase of the air gap length, and the can 4 having a high resistance characteristic against the overcurrent reduces the overcurrent loss. However, it is necessary to provide both of them at the same time to have pressure resistance and corrosion resistance, and it is extremely difficult to develop such an ideal metal can 4 material. However, it is still in the present condition that is not enough.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a high-permeability soft magnetic metal wire, which is a high-permeability soft-magnetic metal thin wire, preferably an amorphous magnetic metal thin wire, which is electrically insulated in advance. A fine aggregate is formed by winding a plurality of layers in a sinusoidal or triangular wave pattern with the phases shifted in the can axis direction and coating a resin material on the aggregate to form a cylindrical can. It is characterized by being fitted and fixed to the inner circumference of the stator.

Then, the mounting method is as follows. The mesh material is coated with a resin material to form a can having a diameter slightly looser than the inner circumference of the stator, and the can is fixed together with the winding frame before the resin material is cured. After inserting into the child, the winding frame is removed, the can portion is axially pressed to expand the outer circumference, and thus the resin is completely cured and fixed in the state of being closely attached to the inner circumference of the stator. It is characterized by that.

[Operation] In the present invention, in order to increase the void length caused by the presence of the can, the aggregate is formed by the aggregate formed of the high-permeability soft magnetic metal fine wires in a mesh shape, and therefore a large void is formed. Magnetically reduces the appearance.

In this case, when the metal wires are crossed in a mesh shape, an electric closed circuit is formed to generate an overcurrent generated by an AC magnetic flux that vertically passes through the surface of the can. Since it is insulated, the occurrence of excess current loss can be eliminated.

Further, leakage of fluid from the mesh of the mesh-like thin metal wire is completely coated with a resin suitable for this to form a cylindrical can 4 so that no leakage occurs, and the pressure-resistant strength is regularly arranged. By using one or a plurality of continuous thin metal wires as an aggregate, a completely seamless cylinder can be formed, and conversely, a higher compressive strength than a metal plate can be obtained.

Further, in the canned motor, for example, when a compressor or a vacuum pump is used as the driven machine, the pressure inside the can or on the outer circumference side of the can becomes a negative pressure, and a deforming force is applied in the can radial direction. Even in such a case, since the fine metal wires are wound in a sine wave shape or a triangular wave shape, in other words, a plurality of layers are spirally wound to form a mesh-shaped aggregate, a strong compressive strength in the radial direction can be obtained.

In this case, the highly magnetically permeable metal thin wire, which is an aggregate, can be made to be an amorphous magnetic metal thin wire, whereby electrical permeability, mechanical pressure resistance, chemical stability, corrosion resistance, etc. can be substantially satisfied.

The arrangement of the magnetic metal fine wires is such that the winding frame is axially moved along the axis at the same time as the cylindrical winding frame is rotated, so that the winding is wound in a sine wave shape or a triangular wave shape in a spiral shape. As shown in FIG. 3, by winding the device by using a plurality of metal wires with the phases thereof shifted in the axial direction of the winding frame and by winding one metal wire with the phases thereof reciprocally moved. It is possible to form a mesh shape by winding a plurality of layers.

In the invention according to claim 3, when the can 4 is fitted to the inner circumference of the stator 2, the can 4 having a diameter slightly looser than the inner circumference of the stator 2 is inserted before the resin is cured together with the winding frame. Then, the can 4 part is pressed in the axial direction to expand the outer periphery,
It is possible to form a stable canned motor by completely hardening and fixing the inner circumference of the stator 2 in close contact.

In addition, the thickness of the can and the thickness of the magnetic metal thin wire that is the aggregate,
The optimum design of the number of winding layers, etc. is easier to select than the conventional metallic can, and a large capacity canned motor can be realized.

Since the thin metal wire as the aggregate is wound in a sine wave shape or a triangular wave shape, in other words, in a spiral shape, it has a degree of freedom of deformation in the can axial direction, and only the can portion is in the axial direction. Pressing makes it easy to swell in the circumferential direction while narrowing the width in the axial direction and to fix / fix on the inner circumference of the stator.

"Embodiment" Next, a schematic view of a can 4 according to an embodiment of the present invention is shown in FIG. 2 (a), and a side view thereof is shown in (b). 9 shows the enlargement of the aggregate part. The can 4 has a mechanical allowable limit (generally 0.3-1 mm) of 2 with respect to the inner diameter of the stator 2.
A high-permeability soft magnetic metal thin wire 7 which is electrically insulated in advance on a cylindrical bobbin (not shown in the drawing) having a diameter D obtained by adding the diameter of the rotor 3 to the doubled gap length is made to have a phase in the can axis direction. A plurality of layers are shifted and wound into a sine wave or a triangular wave to form a mesh-like aggregate, and the gap is coated with a resin 8 having heat resistance, corrosion resistance, and high strength.

FIG. 3 is a developed view of the can 4, in which a plurality of electrically insulating amorphous magnetic metal thin wires are arranged in two layers by winding them in a sinusoidal shape on a cylindrical winding frame with a phase shift in the can axis direction. A mesh-like aggregate can be formed, and such a winding is a simple winding machine with automatic feeding, which winds the thin metal wire at a predetermined peripheral speed while moving the cylindrical winding frame in the axial direction. It can be easily manufactured.

Then, in order to insert the resin can 4 into the inner circumference of the stator 2, it is inserted into the stator 2 in the state before being coated on the surface of the winding frame, and after the resin is hardened, the winding frame is removed, and only the can portion is formed. It is possible to fit and fix to the inner circumference of the stator 2 by pressing in the axial direction.

"Effects" The present invention, as described above, has one or a plurality of high-permeability soft magnetic metal thin wires arranged regularly in a mesh to form an aggregate, and the gap is coated with an optimum resin to be coated. Therefore, the canned motor apparently reduces a large air gap electromagnetically, which prevents an increase in no-load current and prevents an increase in copper loss. The overcurrent that occurs in 1 does not form a closed circuit even if the magnetically insulating magnetic metal wires come into contact with each other, so there is no overcurrent loss and excellent electrical characteristics are obtained. The mechanical strength can be arbitrarily increased by arranging the thin metal wires, and stable characteristics can be obtained because it is coated with a chemically heat-resistant and corrosion-resistant resin. It is easy to design and manufacture, and has a large capacity canned. Motor can be provided .

[Brief description of drawings]

FIG. 1 is a schematic view of the structure of a canned motor, and FIG. 2 (a).
Is a view of the can, FIG. 3B is a side view thereof, and FIG. 3 is an exploded view of the can. 1: Canned motor, 2: Stator, 3: Rotor, 4: Resin can, 5: Air gap, 6: Driven machine, 7: High permeability soft magnetic thin metal wire, 8: Resin material.

Claims (3)

[Claims] 1. A net-shape formed by winding a plurality of layers of high-permeability soft magnetic metal wires, which are amorphous magnetic metal wires that have been electrically insulated in advance, in a sinusoidal shape or a triangular wave shape with their phases shifted in the can axis direction. The structure of a resin can for a canned motor is characterized in that the aggregate of the above is coated with a resin material and cured to form a cylindrical can, which is fitted and fixed to the inner circumference of the stator. 2. A net-shape formed by winding a plurality of layers of high-permeability soft magnetic metal wires, which are made of amorphous magnetic metal wires that have been electrically insulated in advance, and are wound in a sinusoidal shape or a triangular wave shape with their phases shifted in the can axis direction. The structure of a resin can for a canned motor is characterized in that the aggregate of the above is coated with a resin material and cured to form a cylindrical can, which is fitted and fixed to the inner circumference of the stator. 3. A mesh-like structure formed by winding a plurality of layers of high-permeability soft magnetic metal wires, which are electrically insulated in advance, on a cylindrical winding frame in a sinusoidal or triangular wave pattern with their phases shifted in the can axis direction. After forming a can having a diameter slightly looser than the inner circumference of the stator by coating the aggregate with a resin material, the can is inserted into the stator together with the winding frame before the resin material is cured, and then the winding is performed. A resin for a canned motor, characterized in that the frame is detached, and the can portion is axially pressed to expand the outer periphery, whereby the resin is completely cured and fixed in a state of being in close contact with the inner periphery of the stator. How to install a can.