JPH08237893A - Rotor of d.c. brushless motor and fluid compressor using such rotor - Google Patents

Abstract

PURPOSE: To provide a fluid compressor that provides highly efficient compressing performance by improve the structure of a rotor for d.c. brushless motors to enhance its ability to be assembled, and installing such a rotor for d.c. brushless motor in a fluid compressor just as it is. CONSTITUTION: A rotor 6 consists of a yoke 41 composed of a cylindrical body; a plurality of slots 43 that penetrate the yoke 6 from end to end, and that are positioned at specified intervals in the circumference; press-fit escape portions 44 placed between the slots; and magnets 42 that are press fitted in the slots in the circumference. The rotor 6 is inserted into the cylinder of a fluid compressor to form a motor section composed of a d.c. brushless motor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is a DC with an improved rotor.
The present invention relates to a fluid compressor that is a brushless motor and that includes this rotor and that is used in, for example, a refrigeration cycle device.

[0002]

2. Description of the Related Art A compressor that performs a gas compressing action has an electric motor unit connected to a compression mechanism unit via a rotary shaft. Gas is sucked into the compression space of the compression mechanism section, and the volume of the compression space is gradually reduced to perform the compression action.

An AC motor is usually adopted for the electric motor section, which is arranged with a cylindrical rotor fitted on the rotary shaft and a narrow gap with the outer peripheral surface of the rotor.
It is composed of a stator fixed to the inner peripheral wall of the hermetically sealed case that houses the electric motor section and the compression mechanism section.

However, in principle, slippage is unavoidable in such an AC motor, and it is difficult to improve efficiency. On the other hand, the DC motor is more slippery than the AC motor, and the adoption of the DC motor is promoted because the improvement of efficiency is desired.

Conventionally, as shown in FIG. 16, a magnet c is interposed between an inner cylinder a and an outer cylinder b to form a rotor R of a DC magnet motor. An adhesive is used as a means for integrating the inner and outer cylinders a and b with the magnet c. That is, these are fitted in a state where an adhesive is applied to the contact portions of each other in advance.

[0006]

In this case, there is a problem that it takes time and effort to assemble, and when it is used in, for example, a refrigeration cycle apparatus, the rotor R is in an atmosphere of high temperature gas, the adhesive melts, and finally it falls off. There is a risk of
A rotor having an alternative structure is desired.

On the other hand, Japanese Patent Laid-Open No. 5-56583 discloses that
Disclosed is a permanent magnet rotor in which a protruding portion is provided at a peripheral portion of a slot, and a void portion is provided at a base portion of the protruding portion, and a field permanent magnet is press-fitted into the slot.

When a permanent magnet is pressed into this slot,
There is little friction due to the contact between the permanent magnet and the slot, it can be press-fitted with a small force, and because the matching of the slot and the permanent magnet does not require high processing accuracy, the rotor can be easily manufactured and the permanent magnet can be reliably removed. It can be prevented.

However, the protrusion integrally formed with the slot has a shape in which two sides of a triangle are protruded, and it is expected that the protrusion is easily bent by press-fitting a permanent magnet.

The shape of the protrusion means that the permanent magnet is held in a state close to a wire, and the holding area is small.
Therefore, the holding force is small, and there is a possibility that reliable fixing cannot be performed.

Further, it is premised that the permanent magnet rotor is provided with a plate-shaped permanent magnet for field, and this holding structure is
It is impossible to apply it to the cylindrical magnet c as described above with reference to FIG. 16 due to the difference in configuration.

On the other hand, the following fluid compressor is known as a type of compressor. This is because a piston is eccentrically arranged in a cylinder fitted with an electric motor part, and a spiral groove having a gradually decreasing pitch is formed in the piston from one end side to the other end side so that a blade can freely move in and out. Fit in.

The space between the cylinder and the piston is divided into a plurality of blades, and a compression chamber whose volume is gradually reduced from one end side to the other end side is formed in the cylinder. It is formed.

The rotational force of the cylinder is transmitted to the piston via the transmission mechanism, and the cylinder and the piston rotate synchronously at a relative peripheral speed while maintaining the positional relationship. With these rotations, the blade is projected and retracted in the radial direction of the piston.

For example, the refrigerant gas in the refrigeration cycle is
It is sucked into the cylinder through the suction passage, gradually transferred from the compression chamber closest to the suction side among the compression chambers to the compression chamber closest to the discharge side, and gradually compressed.

When reaching the compression chamber on the most discharge side, the pressure rises to a predetermined pressure, and once through the discharge passage, the closed case 1
It will be guided inside. Then, the filled high-pressure gas is introduced into the refrigeration cycle from the discharge pipe connected to the closed case.

As a motor part of such a fluid compressor, D
Employing the C brushless motor can not only reduce power consumption but also increase the efficiency of the motor and improve the compression performance.

The present invention has been made in view of the above circumstances. An object of the present invention is to improve the rotor structure of a DC brushless motor so as to improve the assemblability thereof, and to improve the rotor of the DC brushless motor. The present invention is intended to provide a fluid compressor having high-efficiency compression performance by equipping the fluid compressor as it is.

[0019]

In order to achieve the above object, the present invention provides, as claim 1, a yoke made of a cylindrical body and a predetermined gap that penetrates both end faces of the yoke and extends in the circumferential direction. DC brushless, characterized in that a plurality of slots provided through the slots, press-fitting escape portions provided in gaps between the slots, and magnets press-fitted in the circumferential direction in each slot are provided. It is the rotor of the motor.

A second aspect of the present invention is characterized in that the yoke according to the first aspect is constituted by laminating thin plates having a thickness of 1 mm or less. According to a third aspect of the present invention, the thin plate forming the yoke according to the second aspect is provided with a positioning portion for positioning and locking the laminated thin plates together with the press-fitting escape portion in the gap between the slots. To do.

A fourth aspect of the present invention is characterized in that the hooking portion and the press-fitting relief portion according to the third aspect are adjacent to each other along the radial direction of the yoke. According to a fifth aspect of the present invention, a cylinder whose both ends are rotatably supported by bearings, a rotor eccentrically supported by the bearings, and the shafts are eccentrically arranged in the cylinder, and a peripheral surface of the rotor is provided. A spiral groove formed at a gradually smaller pitch along the axial direction, a spiral blade fitted in the groove so as to be able to move in and out, and a plurality of compression chambers which are gradually divided into smaller volumes by the blade. , A rotational force transmission mechanism for rotating the cylinder and the rotating body at a relative peripheral speed and synchronously, and compressing and discharging the compressed fluid sucked into the compression chamber while gradually transferring it to the compression chamber. In the one provided with a compression mechanism portion configured, a cylindrical yoke is provided on the outer peripheral surface of the cylinder,
A plurality of slots that are provided so as to penetrate both end surfaces of the yoke and that are provided with a predetermined gap along the circumferential direction, a press-fitting relief portion that is provided in the gap between these slots, and each slot with this peripheral portion. A fluid compressor is characterized in that a rotor of a DC brushless motor having a magnet press-fitted in a direction is fitted.

According to a sixth aspect of the present invention, the slot of the yoke constituting the rotor according to the fifth aspect is opened on the rotation center side, and the magnet is in direct contact with the outer peripheral surface of the cylinder.

According to a seventh aspect of the present invention, the cylinder according to the fifth aspect is provided with a hook portion on its outer peripheral surface, and the yoke has an inner peripheral surface on which the hook portion engages with the hook portion on the outer peripheral surface of the cylinder. Is provided.

According to an eighth aspect, the hooking portion provided on the cylinder outer peripheral surface according to the seventh aspect is a groove having a blind portion provided from one end surface of the cylinder to an intermediate position in the axial direction. The engaging portion provided on the peripheral surface is a protrusion provided intermittently or continuously along the axial direction of the yoke.

Claims 2 and 5 are defined as Claim 9.
In the slot formed in the yoke according to any one of the above, a press-fitting portion into which the magnet is press-fitted and a non-press-fitting portion that is inserted in a loosely inserted state are partially formed along the axial direction of the yoke. Is characterized by.

According to a tenth aspect of the present invention, the press-fitting portion of the magnet according to the ninth aspect is formed only at both axial end portions of the yoke, and both end surfaces of the stator are loosely inserted with a narrow gap from the outer peripheral surface of the rotor. It is characterized in that it is located outside.

According to an eleventh aspect of the present invention, in the magnet press-fitted in the circumferential direction of each slot according to any one of the second and fifth aspects, the press-fitting end portion is formed in a convex shape. To do.

According to a twelfth aspect of the present invention, a sleeve is fitted on the outer peripheral surface of the cylinder according to any one of the fifth to eighth aspects, and the axial positioning of the rotor is performed by the sleeve. A thirteenth aspect of the present invention is characterized in that the sleeve according to the twelfth aspect is integrally provided with a lid portion that comes into contact with the rotor end surface.

[0029]

According to this structure, the magnet can be attached and fixed to the slot without using an adhesive agent, and the position of the magnet can be surely held without being affected by aging. If such a rotor is used in a fluid compressor, the compression performance will be improved.

[0030]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the hermetically sealed case 1 includes a case main body 1a having both ends opened with the axial direction oriented horizontally, and an upper lid 1b closing one end opening of the case main body 1a.
It is composed of a lid plate 1c that closes the opening at the other end. In the closed case 1, a compression mechanism section 3 and an electric motor section 4 including a DC brushless motor are housed.

The compression mechanism section 3 has a cylinder 5 made of a hollow cylinder whose both ends are open, and a rotor 6 to be described later is fitted on the outer peripheral surface of this cylinder. A stator 7 is fitted on the inner peripheral surface of the case body 1a of the hermetically sealed case 1, and the rotor 6 and the electric motor portion 4 are configured. The electric motor section 4 is a rotary drive source for rotationally driving the cylinder 5.

A piston 8 as a rotating body is eccentrically arranged in the cylinder 5. That is, a part of the peripheral wall of the piston 8 along the axial direction contacts the part of the inner peripheral wall of the cylinder 5 along the axial direction.

A pair of left and right spiral grooves (not shown) are formed on the circumferential surface of the piston 8 so that the pitch is gradually reduced from the axial middle portion to both end sides, and each groove has a spiral shape. Blades 10 and 10 are fitted so that they can come in and go out freely.

Therefore, the space between the cylinder 5 and the piston 8 is divided into a plurality of chambers by the blades 10 and 10 on the left and right sides of the intermediate portion as a boundary. In the cylinder 5, a plurality of compression chambers 11 ..., 11 ... whose volume is gradually reduced from the middle part to both end sides of the cylinder, that is, from the suction side to the discharge side are formed.

Shaft portions 8a, 8 are provided at both end portions of the piston 8.
b, a main bearing 12 having these shafts fixed to the inner wall of the hermetic case 1, and an auxiliary bearing 1 separately supported.
It is inserted into the three pivotal support holes 12a and 13a and pivotally supported so as to be rotatable.

The pivot support holes 12a and 13a are eccentrically provided in the main and auxiliary bearings 12 and 13, and the piston 8 inserted therein is pivotally supported in an eccentric position.

The main bearing 12 is screwed and fixed to a cover plate 1c which constitutes the closed case 1, and a suction pipe 14 is connected to a portion of the cover plate which communicates with a pivot hole 12a. The gas suction guide passage 15 that communicates with the suction pipe 14 through the pivot hole 12a is formed by the shaft portion 8a of the piston 8.
It is provided so as to penetrate from the end face along the axial direction.

The opening end of the gas suction guide passage 15 on the side of the auxiliary bearing 13 is closed by a closing cover 24 provided on the bearing. In the middle of the guide passage 15,
The vertical holes 15a are provided in a direction orthogonal to each other and open on the circumferential surface of the piston 8. The opening position corresponds to the space between the pair of left and right blades 10, 10.

Cylinder bearings 16a and 16b made of metal are press-fitted to the inner peripheral surfaces of both ends of the cylinder 5, respectively.
13 is interposed.

Each of the cylinder bearings 16a and 16b is formed in a thick ring shape, one side surface of which is spaced from the end surface of the piston 8 and the other side surface is flush with the end surface of the cylinder 5. Therefore, there is a gap with the flange surfaces of the bearings 12 and 13.

Cylinder bearing 16a on the main bearing 12 side
A plurality of lead-out guide holes 17 that are opened on both side surfaces of the bearing are provided along the axial direction. No hole is bored in the cylinder bearing 16b on the side of the sub bearing 13. Instead, the lead-out guide hole 18 is provided at the portion of the cylinder 5 that does not interfere with the end surface of the cylinder bearing 16b.

Upper lid 1b and lid plate 1 which form the closed case 1
Outlet pipes 19a and 19b are connected to c, respectively, and these pipes join outside and communicate with a refrigeration cycle device (not shown).

On the other hand, an oil reservoir 20 for collecting lubricating oil is formed on the inner bottom of the closed case 1. Then, the oil suction passages 21a and 21b integrally provided in the main and auxiliary bearings 12 and 13 are soaked in the lubricating oil of the oil sump 20.

The upper ends of these oil suction passages 21a, 21b communicate with oil supply pumps 22a, 22b provided on the peripheral surfaces of the shafts 8a, 8b of the piston 8. An Oldham mechanism 25 as a mechanism for transmitting the rotational force of the cylinder 5 to the piston 8 is provided between the cylinder bearing 16b on the side of the sub bearing 13 and the shaft portion 8b of the piston 8.

Fluid guide members 26 and 27 are attached so as to face both ends of the cylinder 5, respectively. One fluid guide member 26 is fitted to the outer peripheral surface of the main bearing 12,
It is composed of a cylindrical interposition portion 28 which covers the outer peripheral surface of the end portion of the cylinder 5 with a gap, and a partition portion 29 which is provided over the outer peripheral surface and the inner peripheral surface of the closed case.

The interposition part 28 is a cylinder bearing 16a.
It is parallel to the lead-out guide hole 17 provided in the and is opposed to this opening end with a gap. One opening end is the main bearing 12
Is closed at the end face thereof and the other open end opens in a state of facing the electric motor unit 4.

The partition part 29 is interposed between the end of the closed case 1 and the electric motor part 4, and is located at a position where the end part is divided into left and right parts. The partition part 29 partitions the oil sump part 20 together with the inside of the closed case. An oil guide cutout 30 is provided at a position of the oil sump 20 where the oil is immersed in the lubricating oil, and a gas guide hole 31 is provided at a position where the inside of the case is partitioned on the oil level.

The other fluid guide member 27 is the closed case 1.
The partition 32 is fixed between the end of the case body 1a and the end of the upper lid 1b, and the interposition 33 is provided integrally with the partition.

The partition part 32 is interposed between the end of the closed case 1 and the electric motor part 4 and is located at a position where the end part is divided into left and right parts, and partitions the oil sump part 20 together with the inside of the closed case. An oil guide notch 34 is provided at a position where the oil sump 20 is immersed in the lubricating oil, and a gas guide hole 35 is provided at a position for partitioning the inside of the case.

The interposition portion 33 is bent around the outer peripheral surface of the end portion of the cylinder 5 with a gap and extends between the coil end 7a of the rotor 7. That is, the cylinder 5 and the guide hole 18 provided in the cover body 6a are opposed to each other with a gap, and only the end portion on the opposed side is opened.

Next, the rotor 6 constituting the DC brushless motor which is the electric motor section 4 will be described in detail. Figure 2
As shown in FIG. 3, the rotor 6 is formed by laminating a plurality of plates 40 ... In the same direction, and a yoke 41 formed in a cylindrical body and a plurality of ( 4) magnets 42 ...

The plate 40 is a non-magnetic material and is a thin plate having a thickness of 1 mm or less. For example, the stator 7 that constitutes the electric motor portion 4 together with the rotor 6 is formed of a silicon steel plate, but it is also possible to use this surplus material.

In any case, since it can be formed by punching and press working, it is easier to form than a case where the solid one-piece material is successively cut and laminated. The plate 40 has an annular shape, and is provided with four concentric arc-shaped slots 43 along the circumferential direction. That is, these slots 43 are penetrated along the axial direction of the yoke 41 and open at both end surfaces thereof.

The inner edge of each slot 43 and the plate 40
Between the outer peripheral edge of the slot 43 and the outer peripheral surface of the plate 40 is very small.

On the other hand, the end portions of the slots 43 in the circumferential direction are kept at a certain length, and the gaps 45 are provided with the press-fitting escape portions 44 formed of long holes in the radial direction. . The press-fitting escape portion 44 is provided in the yoke 4
1 is penetrated along the axial direction, and is opened at both end faces.

The magnet 42 is formed in an arc shape according to the radius of curvature of the slot 43. Then, the arc-shaped both end surfaces of the magnet 42 are all press-fitted into the end surfaces of the slot and are in surface contact with each other. Since the contact area is large, the rotor 6 in which the magnet 42 is securely fixed and held by the yoke 41 can be obtained.

The inner and outer peripheral surfaces of the magnet 42 are dimensioned so as to be loosely inserted into the inner and outer peripheral surfaces of the slot 43. When the magnet 42 is press-fitted into the slot 43, the pressing force reaches the gap portion 45 between the slots 43.

Even if the gap 45 is crushed and deformed in the circumferential direction under the influence of the press fit, the press fit escape portion 44 formed in the gap absorbs the deformation and the adjacent slot 43 is formed. There is no deformation of.

As described above, when the magnets 42 are press-fitted into the slots 43, even if one magnet is press-fitted or a plurality of magnets are press-fitted at the same time, the magnets 42 are smoothly pressed without any trouble, and surely press-fitted. Is possible.

Thus, the rotor 6 and the cylinder 5 rotate integrally with the electric power supply to the electric motor section 4 which is a DC brushless motor. The rotational force of the cylinder 5 is transmitted to the piston 8 via the Oldham mechanism 25. Due to the action of the Oldham mechanism 25, the cylinder 5 and the piston 8 rotate at a relative peripheral speed due to the difference in radius between each other and in synchronization while maintaining their mutual positional relationship.

With the rotation of the cylinder 5 and the piston 8, the pair of blades 10 and 10 simultaneously move in and out of the respective grooves, and the piston 8 is projected and retracted in the radial direction. A compressed gas, for example, a refrigerant gas in a refrigerating cycle is sucked from the suction pipe 14, and the pivot support hole portion 1 of the main bearing 12 is
It is guided to a substantially middle portion of the cylinder 5 via the 2a and the gas suction guide passage 15.

The substantially intermediate portion of the cylinder 5 between the blades 10 and 10 is the compression chamber located on the most suction side among the compression chambers 11 formed on both the left and right sides, and from this point to the most extraction side. It is sequentially transferred to the left and right compression chambers on both sides.

The refrigerant gas is gradually compressed while being sequentially transferred through the compression chambers 11. Then, when it is transferred to the compression chambers 11, 11 that are the most derived sides of the left and right ends,
Raise to a specified pressure.

The high-pressure gas is discharged from one of the compression chambers 11 through the discharge guide hole 17, once collides with the end surface of the main bearing 12, and further the outer peripheral surface of the cylinder 5 and the fluid guide member 26.
Guided through the gap with the intervening part 28, it is led out into the closed case 1.

Further, the space between the electric motor section 4 and the partition section 29 of the fluid guide member 26 is guided out and filled,
It is guided to the end portion side of the case 1 through the gas guiding hole 31 and discharged from the discharge pipe 19b to the external refrigeration cycle equipment.

The high-pressure gas discharged from the other compression chamber 11 is led out from the lead-out guide hole 18 provided in the cylinder 5, and once in the intervening portion 33 of the fluid guide member 27 facing the hole.
After the collision, the interposition part 33 and the stator coil end 7a
It is guided out of the gap between and and led out into the closed case 1. Further, the case 1 is provided through the gas guide hole 35 of the partition 32.
It is guided to the end side and discharged from the discharge pipe 19a to the external refrigeration cycle equipment.

In such a fluid compressor, since the DC brushless motor is adopted as the electric motor section 4, the AC
Compared with a motor, it has highly efficient rotary drive without slippage and consumes less power, contributing to improved compression performance.

Moreover, the rotor 6 of the DC brushless motor
In manufacturing, the cylindrical yoke 41 is provided with the arc-shaped slot 43, and the magnet 42 is press-fitted into the end portion in the circumferential direction. Therefore, the magnet is easily assembled and the holding force is increased. Improved reliability can be obtained.

As shown in FIG. 4, the space between the adjacent slots 43, 43 provided in the plate 40 is widened,
A positioning portion 46 is provided at the center of the spacing portion 45, and the press-fitting escape portion 4 described above is provided on both sides of the positioning portion 46.
4, 44 may be provided. The positioning portion 46 has a rectangular shape in a plan view.

As shown in FIG. 5, the positioning portion 46 is a recessed portion formed on the back surface of the plate 40 by protrusion, and the protrusion depth dimension is almost equal to the plate thickness of the plate. Only the plate 40 located on the lowermost side has a rectangular hole 4
6a is provided.

To form the yoke 41, the plate 40
When sequentially stacking, the hole portion 46 of the lowermost plate 40
The positioning portion 46 of the plate 40 superposed thereon is engaged with a, and the plates 40 successively superposed thereon are brought into a state in which the positioning portions 46 are engaged with each other.

Therefore, a large number of laminated plates 4
No. 0 has no positional deviation with respect to each other, and in a completed state, the peripheral surfaces of the slots 43 formed here are accurately aligned without causing unevenness.

As shown in FIG. 6A, in the gap portion 45A, the press-fitting escape portion 44 may be provided on the inner peripheral side and the positioning portion 46 may be provided on the outer peripheral side. In this case, the positioning portion 46 sets its longitudinal direction in a direction orthogonal to the radial direction.

Therefore, the end portion of the slot 43A can be extended so as to be close to the press-fitting escape portion 44 and the positioning portion 46. Then, the magnet 42A can be partially extended in the circumferential direction by that amount, which leads to an increase in the generation of magnetic flux.

Alternatively, as shown in FIG. 6B, the press-fitting escape portion 44 may be provided on the outer peripheral side in the gap portion 45B, and the positioning portion 46 may be provided on the inner peripheral side. Also in this case, the positioning portion 46 sets its longitudinal direction in a direction orthogonal to the radial direction.

Therefore, the end portion of the slot 43B can be extended so as to be close to the press-fitting escape portion 44 and the positioning portion 46. Then, the magnet 42B can be partly extended in the circumferential direction, and the generation of magnetic flux is increased.

As shown in FIG. 6C, in the gap portion 45C, with the press-fitting escape portion 44 and the positioning portion 46 arranged in the radial direction, the slot 43C is formed so that the inner peripheral surface side is open. 40 may be partially cut.

In this structure, the inner peripheral surface of the magnet 42C fitted in the slot 43C is exposed. When the rotor 6 is formed in this state and is fitted into the cylinder 5 as described above, the magnet 42C comes into direct contact with the cylinder. As a result, the plate thickness of the magnet 42C can be increased, and the motor efficiency can be improved.

As shown in FIG. 7 (A), the rotor 6 A here has the press-fitting escape portion 44 in the gap portion 45 of the yoke 41, but the inner peripheral surface facing the gap portion 45 remains unchanged. The engaging portion 47 is integrally provided on the side. This hook 4
7 is provided in the axial direction of the yoke 41.

As shown in FIG. 7B, the engaging portion 47 is provided.
May be provided intermittently along the axial direction of the yoke 41 at a predetermined interval. As shown in FIG. 8 (A), the cylinder 5A into which the rotor 6A is inserted is provided with hooking portions 48a ...

As shown in FIG. 7B, the hooking portion 48 is provided.
a is provided over the entire axial length of the cylinder 5A.
As shown in FIG. 7C, the hooks 48b may be provided on the outer peripheral surface of the cylinder 5A at a predetermined angle and from the end surface in the axial direction to a position of a predetermined length l.

In any case, the engaging portion 47 of the rotor 6A
Will be fitted and inserted into the hooking portions 48a and 48b of the cylinder 5A, which will facilitate the work of assembling the cylinder 5A and the rotor 6A, and will not cause any positional deviation in the circumferential direction when these are rotationally driven. Since it does not occur, the motor efficiency can be improved.

In particular, by providing the cylinder 5A shown in FIG. 8C, the rotor 6A may be fitted and inserted up to the end of the hooking portion 48b provided therein, and this end serves as a contact portion with respect to the rotor. And help improve workability.

As shown in FIGS. 9 and 10, the circumferential length of the slot 43D is partially and alternately changed along the axial direction of the yoke 41. That is, a long arcuate shape and a short arcuate shape are alternately formed.

As the magnet 42 press-fitted in here, the same one as described above is used. Therefore,
In the slot 43D, a press-fitting portion into which the magnet 42 is press-fitted and a non-press-fitting portion inserted in a loosely inserted state are partially and alternately formed.

With the rotor 6B constructed in this way, the pressure input of the magnet 42 can be adjusted, the deformation of the yoke 41 can be avoided, and the assembly is facilitated.

As shown in FIG. 11, with respect to the stator 7 constituting the electric motor section 4 which is a DC brushless motor, the rotor 6C here is a press-fitting section for press-fitting the magnet 42 into the slot 43E only at both ends thereof. Between them is a non-press-fitting part in which the magnet is loosely inserted into the slot. Then, the press-fitting portion is limited to a portion projecting from both end surfaces of the stator 7, and all the portions facing the stator are non-press-fitting portions.

With such a structure, the magnet 42
Even if, for example, the outer diameter of the yoke 41 is deformed due to the influence of the pressure input to the slot 43E, the press-fitting portion is limited to the position protruding from both end surfaces of the stator 7,
Since all the surfaces facing the stator are non-press-fitted portions, it is possible to secure the gap setting between the rotor 6C and the stator 7 and improve the reliability.

As shown in FIG. 12 (A), the magnet 42D is a yoke 41 having only the press-fitting escape portion 44 in the gap portion 45, and the press-fitting end portion of the magnet 42D is bent. It is formed on the raised convex portion d.

As shown in FIG. 7B, the yoke 41 is provided with a pair of press-fitting escape portions 44, 44 in the gap portion 45 and a positioning portion 46 between them, and is press-fitted into each slot 43. The magnet 42 </ b> E is formed on the convex portion d having a bent press-fit end.

By configuring the magnets 42D and 42E as described above, the central portion of the convex surface portion d is press-fitted, and the slot 43 and the press-fitting escape portion 4 are inserted.
Deformation 4 is facilitated and reliable press-fitting is performed.

As shown in FIG. 13A, the magnet 41F is a yoke 41 having a press-fitting escape portion 44 in the gap 55, and the press-fitting end portion of the magnet 42F has a flat end surface. It is the edge part f.

As shown in FIG.
The width dimension m of the end face of the edge portion f in F is preferably set to be smaller than 2/3 of the width dimension n of the magnet itself. With the magnet 42F having such a configuration,
Since the central flat portion of the edge portion f is press-fitted, the slot 43 and the press-fitting escape portion 44 are easily deformed, and reliable press-fitting is performed.

As shown in FIG. 14, with the magnet 42 being press-fitted, the cover plates 50, 50 matching the end face shape of the rotor 6 are attached to both end faces of the rotor 6 by appropriate means, and both ends of the magnet 42 and the yoke 41 are attached. The face may be closed.

In this way, the magnet 42, which is press-fitted into the slot 43 and positioned in the circumferential direction, is attached to the cover plate 50,
By using 50, it is possible to reliably regulate the axial direction so that there is no positional deviation, and the reliability can be improved.

As shown in FIG. 15 (A), as described above with reference to FIGS. 7 and 8 (A) and 8 (B), the engaging portion 47 formed of a ridge is provided on the inner peripheral surface of the rotor 6A. Cylinder 5A
Hooking portions 48a formed of concave grooves are provided on the peripheral surface of the above at predetermined intervals, and these are fitted into each other. And cylinder 5A
The sleeves 51, 51 are fitted into the outer peripheral surface from both sides of. The ends of the sleeves 51, 51 must be fitted so as to abut the end surface of the rotor 6A.

Therefore, the positioning of the rotor 6A with respect to the cylinder 5A is ensured by the sleeves 51, 51, and the positional deviation of the rotor in the axial direction is surely regulated. The engagement of the engagement portion 47 and the engagement portion 48a also regulates the positional deviation of the rotor 6A in the circumferential direction.

As shown in FIG. 7B, as described above with reference to FIGS. 7 and 8A and 8C, the engaging portion 47 formed of a ridge is provided on the inner peripheral surface of the rotor 6A. On the peripheral surface of the cylinder 5A, there is provided a hooking portion 48b which is a groove and has a predetermined distance from the cylinder end surface up to a predetermined length l, and these are fitted into each other.

Then, the sleeves 51, 51 are fitted on the outer peripheral surface of the cylinder 5A from both sides. Each sleeve 5
The ends of 1, 51 must be fitted so as to abut the end face of the rotor 6A.

Therefore, the sleeves 51 and 51 ensure the positioning of the rotor 6A with respect to the cylinder 5A, and the positional deviation of the rotor in the axial direction is reliably regulated. The engagement of the engagement portion 47 and the engagement portion 48b does not change the restriction of the positional deviation of the rotor 6A in the circumferential direction.

As shown in FIG. 7C, the groove is provided on the outer peripheral surface of the cylinder 5A up to a position of a predetermined distance l from the end surface of the cylinder 5A, and the sleeve is attached to the outer peripheral surface of the cylinder from both sides of the rotor 6A. Insert 51 and 52.

Only one sleeve 52 is integrally provided with a lid portion 52a for covering the end surface of the rotor 6A. Therefore,
The lid 52a is provided on the end surface of the magnet 42 exposed here.
Contact with each other to regulate the positional deviation of the magnet in the axial direction.

By adopting the sleeves 51 and 52, the rotor 6A can be reliably positioned with respect to the cylinder 5A, the positional deviation of the rotor in the axial direction can be regulated, and the engagement portion 47 and the engagement portion 48b can be engaged to each other. Position deviation in the circumferential direction is controlled. Of course, the sleeve 52 having the lid portion 52a covers the rotor 6A from both sides, and the magnet 4
It is needless to say that the positional deviation of the two axial directions may be restricted.

[0104]

As described above, the rotor of the DC brushless motor according to the first aspect of the present invention is characterized in that, in claim 1, both ends of the cylindrical yoke are penetrated, and a plurality of slots are provided in the circumferential direction with a predetermined gap therebetween. Since the press-fitting escape portions are provided in the gaps between the slots and the magnets are press-fitted in the respective slots in the circumferential direction, when attaching the magnets to the slots of the yoke, the conventional Since no adhesive is required, the work time is reduced and the ease of assembly is greatly improved. Moreover, since the end portion of the magnet in the circumferential direction is press-fitted into the slot, a reliable press-fitting effect is obtained and reliability is improved.

According to the second aspect of the present invention, since the yoke is formed by laminating thin plates of 1 mm or less, it is possible to use, for example, the scrap material (remainder material) of the silicon steel plate used in the stator that constitutes the electric motor section. Thus, it can be manufactured at low cost, and is efficient because of the laminated plate made of this silicon steel plate.

According to the third aspect, since the press-fitting escape portion and the positioning portion are provided between the slots formed in each thin plate, the stacking work of the thin plates can be facilitated and the slot can be accurately formed.

According to the present invention, since the positioning portion and the press-fitting escape portion are provided adjacent to each other along the radial direction of the yoke, the circumferential length of the magnet can be reduced as compared with the case where they are provided adjacent to each other in the circumferential direction. It can be made as long as possible and motor efficiency is improved.

In the fluid compressor of the second invention, the rotor of the DC brushless motor disclosed in claim 1 is fitted in the cylinder of the fluid compressor in claim 5, so that the fluid compressor has an effect peculiar to the fluid compressor. It is possible to combine the compression mechanism section and the electric motor section composed of a DC brushless motor for improving reliability, and it is possible to significantly improve the compression performance.

According to the sixth aspect of the invention, since the rotation center side of the slot is opened and the magnet is brought into direct contact with the outer peripheral surface of the cylinder, the magnet can be made thicker by that amount, and the motor efficiency is improved. Further, when the thickness of the magnet is left unchanged, the outer diameter of the yoke can be reduced, and the motor can be downsized.

According to the present invention, the outer peripheral surface of the cylinder and the inner peripheral surface of the yoke are provided with the engaging portion and the engaging portion, respectively. Therefore, the positional deviation between the cylinder and the rotor in the circumferential direction is surely regulated, and the rotational force of the rotor is increased. Can be transmitted to the cylinder.

According to the eighth aspect of the present invention, since the hooking portion of the cylinder is a groove having a blind portion and the hooking portion provided on the yoke is a ridge, the rotor can be easily positioned in the cylinder axial direction and the assemblability is improved. Good.

In the ninth aspect, since the slot has a press-fitting portion into which the magnet is press-fitted and a non-press-fitting portion are partially formed along the axial direction of the yoke, the press-fitting force when press-fitting the magnet can be adjusted. , The deformation of the yoke is surely prevented.

According to the tenth aspect of the invention, the press-fitting portions of the magnet are formed only at both ends of the yoke in the axial direction and are located outside the both end surfaces of the stator. Therefore, the yoke is deformed by the influence of press-fitting of the magnet. Even in such a case, the gap with the stator can be maintained accurately, and the motor efficiency will not be adversely affected.

In the eleventh aspect, since the press-fitting end portion of the magnet is formed in a convex shape, the press-fitting portion of the slot is easily deformed and the magnet can be securely press-fitted. Claim 12
In the above, since the sleeve is fitted on the outer peripheral surface of the cylinder and the axial positioning of the rotor is performed by this sleeve, the position of the magnet is stable and the assemblability can be improved.

According to the thirteenth aspect, since the end portion of the sleeve is integrally provided with the lid portion that comes into contact with the rotor end surface, it is possible to reliably regulate the positional deviation of the magnet in the axial direction and improve the reliability. In addition, the number of parts can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a fluid compressor including a DC brushless motor according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional front view of a rotor that constitutes the DC brushless motor of the embodiment.

FIG. 3 is a vertical sectional side view of the rotor according to the embodiment.

FIG. 4 is a partial front view of a yoke of another embodiment.

FIG. 5 is a view for explaining a laminated state of plates that form the yoke in the same embodiment.

FIG. 6A is a partial vertical cross-sectional view of a rotor of yet another embodiment. FIG. 7B is a partial vertical cross-sectional view of a rotor of yet another embodiment. FIG. 6C is a partial vertical cross-sectional view of a rotor of yet another embodiment.

FIG. 7A is a partial vertical cross-sectional view of a rotor of yet another embodiment. FIG. 6B is a vertical cross-sectional front view of the rotor of the embodiment.

8A is a vertical cross-sectional view of a cylinder fitted into the rotor shown in FIG. FIG. 6B is a side view of the cylinder shown in FIG. (C) is a side view of a cylinder of still another embodiment.

FIG. 9 is a longitudinal sectional view of a rotor according to still another embodiment.

10 is a partial vertical cross-sectional view of the rotor shown in FIG.

FIG. 11 is a longitudinal sectional view of a rotor according to still another embodiment.

FIG. 12A is a partial vertical cross-sectional view of a rotor of still another embodiment. FIG. 6B is a partial vertical cross-sectional view of a rotor of still another embodiment.

FIG. 13A is a partial vertical cross-sectional view of a rotor of still another embodiment. FIG. 6B is a partial vertical cross-sectional view of the magnet shown in FIG.

FIG. 14 is a longitudinal sectional view of a rotor according to still another embodiment.

FIG. 15A is a vertical cross-sectional view of a rotor of yet another embodiment. FIG. 6B is a vertical cross-sectional view of a rotor of yet another embodiment. FIG. 6C is a side view of a rotor according to still another embodiment.

FIG. 16A is a vertical sectional side view of a rotor of a conventional example.
(B) is a vertical sectional front view of the rotor.

[Explanation of symbols]

41 ... Yoke, 43 ... Slot, 44 ... Press-fit escape portion,
42 ... Magnet, 6 ... Rotor, 40 ... Plate, 46
... Positioning part, 5 ... Cylinder, 47 ... Engagement part, 48 ... Engagement part, d ... Convex part, f ... Edge part, 51, 52 ... Sleeve.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Naoyoshi Fujiwara 70 Yanagi-cho, Sachi-ku, Kawasaki-shi, Kanagawa Toshiba Yanagimachi Co., Ltd. (72) Inventor Takashi Yanagi-cho, Yuki-cho, Kawasaki-shi, Kanagawa 70 Inside the factory (72) Inventor Takuya Hirayama 70 Yanagicho, Sachi-ku, Kawasaki-shi, Kanagawa Toshiba Yanagimachi Co., Ltd. Inside the factory (72) Teruhisa Tsunekawa, 8 Shinsita-cho, Isogo-ku, Yokohama, Kanagawa Within

Claims (13)

[Claims] 1. A yoke made of a cylindrical body, a plurality of slots penetrating both end faces of the yoke and provided with a predetermined gap along the circumferential direction, and a press-fit provided in a gap portion between these slots. A rotor for a DC brushless motor, comprising: a relief portion and a magnet that is press-fitted into each slot in the circumferential direction. 2. The rotor for a DC brushless motor according to claim 1, wherein the yoke is formed by laminating thin plates having a plate thickness of 1 mm or less. 3. The thin plate forming the yoke is provided with a positioning part for positioning and locking the stacked thin plates together with the press-fitting escape part in the gap between the slots. The rotor of the DC brushless motor according to 2. 4. The rotor for a DC brushless motor according to claim 3, wherein the positioning portion and the press-fitting escape portion in the gap portion are adjacent to each other in the radial direction of the yoke. 5. A cylinder, both ends of which are rotatably supported by bearings, eccentrically and axially supported by the bearings,
A rotating body having an eccentric arrangement between the shaft portions in the cylinder, a spiral groove formed on the peripheral surface of the rotating body at a pitch that gradually decreases along the axial direction, and is fitted in the groove so that it can freely move in and out. A spiral blade, a plurality of compression chambers that are gradually divided into smaller volumes by the blade, the cylinder and the rotating body are rotated at a relative peripheral speed and synchronously, and the compression is performed. A fluid compressor provided with a compression mechanism unit configured to gradually rotate a compressed fluid to be sucked into a chamber while compressing and discharging the compressed fluid, wherein a cylinder is provided on an outer peripheral surface of the cylinder. A yoke formed of a body, a plurality of slots penetrating both end faces of the yoke and provided with a predetermined gap in the circumferential direction, a press-fitting escape portion provided in a gap between these slots, each slot The fluid compressor being characterized in that fitted the circumferential rotor of the DC brushless motors and a magnet to be press-fitted with respect to the direction. 6. The fluid compressor according to claim 5, wherein a slot of a yoke forming the rotor is opened at a rotation center side thereof, and the magnet comes into direct contact with an outer peripheral surface of the cylinder. 7. The cylinder is characterized in that a hooking portion is provided on an outer peripheral surface thereof, and the yoke is provided with a hooking portion which is engaged with the hooking portion on an outer peripheral surface of the cylinder, on an inner peripheral surface thereof. The fluid compressor according to claim 5. 8. The engaging portion provided on the outer peripheral surface of the cylinder is a groove having a blind portion provided from one end surface of the cylinder to an intermediate position in the axial direction, and the engaging portion provided on the inner peripheral surface of the yoke. The fluid compressor according to claim 7, wherein is a protrusion provided intermittently or continuously along the axial direction of the yoke. 9. The slot formed in the yoke is configured such that a press-fitting portion into which a magnet is press-fitted and a non-press-fitting portion that is loosely inserted are partially formed along an axial direction of the yoke. A rotor of the DC brushless motor according to any one of claims 2 and 5, and a fluid compressor using the rotor. 10. The press-fitting portion of the magnet is formed only at both ends in the axial direction of the yoke, and is located outside the both end faces of the stator loosely inserted with a small gap from the outer peripheral face of the rotor. A rotor of the DC brushless motor according to claim 9, and a fluid compressor using the rotor. 11. The DC according to claim 2, wherein the magnet press-fitted in the circumferential direction of each slot has a press-fitted end formed in a convex shape. A brushless motor rotor and a fluid compressor using the rotor. 12. The fluid compressor according to claim 5, wherein a sleeve is fitted on the outer peripheral surface of the cylinder, and the axial positioning of the rotor is performed by the sleeve. 13. The fluid compressor according to claim 12, wherein the sleeve is integrally provided with a lid portion that abuts a rotor end surface at an end portion of the sleeve.