JP2002221181A - motor - Google Patents

Abstract

(57) [Problem] To provide a motor that allows a large amount of fluid to pass per unit time and has a small rotational driving force for rotating a rotor and has excellent performance. SOLUTION: A stator 20 has first openings each having an opening.
The rotor 40 is disposed inside the stator 20 by being sandwiched and fixed by the frame 101 and the second frame 102, and a spiral groove 42 is formed on the outer periphery of the rotor 40.
Is formed, and a fluid is sucked from one of the openings 11 of the first frame 101 and the second frame 102 by the rotation of the rotor 40 and is discharged from the other opening 11, and the rotor 40 is , Is rotatably supported by the shaft 30 via the bearing 42,
Both ends of the shaft 30 are a turbine motor fixed to the first frame 101 and the second frame 102, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a submersible pump, a water propulsion board, and the like. It is about.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, this type of motor has bearings (C, K) held respectively in bearing holding portions (J, K) of a first frame (A) and a second frame (B). D)
The shaft (F) is rotatably supported, and the rotor (E) integrated with the shaft (F) is rotated inside the stator (I). Therefore, the rotor (E) rotates, and the fluid sucked in from the opening (G) of the first frame (A), for example, by the spiral groove (L) provided therein, opens the opening (G) of the second frame (B). H).

[0003]

However, the openings (G, H) through which the fluid is sucked / discharged have to be enlarged to hold the bearings (C, D).
K) and a spoke-shaped arm (not shown) that supports the bearing holding portions (J, K) at the center, thereby allowing a large amount of fluid to pass per unit time and improving the performance of the motor. Was difficult. The rotor (E)
Since the shaft and the shaft (F) rotate integrally, the rotating weight becomes heavy, and a large rotational driving force is required.

Accordingly, an object of the present invention is to provide a motor that allows a large amount of fluid to pass per unit time, requires a small rotational driving force, and has excellent performance.

[0005]

In order to solve this problem, according to the first aspect of the present invention, a stator is sandwiched and fixed from both sides by a first frame and a second frame each having an opening, and a rotation is provided inside the stator. The rotor is arranged, and a spiral groove is formed in the outer peripheral portion of the rotor, and the rotation of the rotor causes the fluid to flow out of the openings of the first and second frames.
In a motor which is sucked from one opening and discharged from the other opening, the rotor is rotatably supported by a shaft via a bearing, and both ends of the shaft are respectively connected to a first frame and a second frame. The motor is characterized by being fixed.

According to the first aspect of the present invention, both ends of the shaft are fixed to the two frames, respectively, and the rotor is rotatable via the bearing. Therefore, the shaft provided on the frame is fixed. The support shaft only needs to fix the shaft, the support shaft is small, the opening area is large, and it is possible to suck and discharge a large amount of fluid per unit time, and at the same time, only the rotor is rotated. Thus, the rotating weight of at least the shaft is reduced, and the required rotational driving force is reduced.

According to a second aspect of the present invention, there is provided a motor according to the first aspect, wherein the bearings are provided at both ends in the axial direction of the rotor.

According to the second aspect of the present invention, the bearings provided at both ends in the axial direction of the rotor rotate the rotor without disposing other components at positions obstructing the flow of the fluid. This allows the fluid to pass efficiently.

According to a third aspect of the present invention, there is provided the motor according to the second aspect, wherein the bearing is made of a resin with a flange, is fixed to the rotor, and comes into contact with the frame via a washer. .

According to the third aspect of the present invention, since the bearing having the flange is formed of resin and the flange is in contact with the frame via the washer, the load in the thrust direction applied to the bearing is supported by the frame. In addition, the rotor can rotate more stably, and the rotational contact frictional force of the contact portion between the bearing and the frame is dispersed by the washer to prevent wear of the bearing and the frame, and the bearing is formed of resin. Therefore, the weight of the rotating part is lighter, and the noise generated by the rotation can be suppressed.
Lubrication is reduced.

According to a fourth aspect of the present invention, in the second aspect, the bearing is fixed to the rotor and abuts the end face of the enlarged diameter step formed at the intermediate portion of the shaft via a washer. Motor.

According to the fourth aspect of the present invention, since the bearing is in contact with the end face of the enlarged diameter step formed at the intermediate portion of the shaft via the washer, the load on the bearing in the thrust direction is reduced. In addition to being supported by the end face of the enlarged diameter step portion, the rotating contact frictional force is dispersed by the washer, so that it is possible to prevent wear of the bearing and the like.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. 1 to 3 show embodiments of a motor according to the present invention.

In the figure, the motor is roughly composed of a frame 10, a stator 20, a shaft 30, a rotor 40, and bearings 50 and 60.

The frame 10 has the same or similar first
It is composed of two frames, a frame 101 and a second frame 102. The first frame 101 and the second frame 102 are formed, for example, by bending the periphery of a steel plate that has been made into a circular shape by press forming to form a flange portion, and punching the inside to form an opening 11. Of course, it is not limited to a steel plate but may be formed of cast iron or synthetic resin, and molding is performed according to each material.

As is well known, the stator 20 has a coil 21 wound around an iron core (not shown), is sandwiched from both sides by two frames 101 and 102 each having an opening 11, and is clamped and fixed by bolts (not shown). ing.

The shaft 30 is fixed at both ends to two frames 101 and 102 through the stator 20 thereof, and does not rotate by itself.

The rotor 40 is disposed inside the stator, and is rotatable around its shaft 30 via bearings 50 and 60. Further, as shown in FIG. 4, a spiral groove 42 is formed in the outer peripheral portion of the rotor 40, and by the rotation of the rotor 40, a fluid is sucked from the opening 11 of one frame 10 and the other frame is rotated. 10
Is released from the opening 11.

The suction or discharge of the fluid depends on the opening 1 of the first frame 101 and the second frame 102.
1, the passage direction of the fluid is determined by the rotation direction of the rotor 40 and the direction in which the spiral groove 42 is formed. In each of the embodiments, the rotor 40 rotates clockwise as viewed from the first frame 101 side, sucks fluid from the first frame 101 side, and discharges fluid from the second frame 102 side.

The opening 11 is formed in the frame 10 so as to be capable of sucking or discharging a fluid, and the portion facing the spiral groove 42 opened on the axial end face of the rotor 40 is made as large as possible. Is preferred. A plurality of spoke-shaped arm portions (not shown) extend radially from the support shaft portion 12 that fixes the shaft 30 located at the center of the opening 11 to define the opening 11.

The shaft portion 12 fixes the shaft 30 by press-fitting or caulking, etc., and a radial direction which is a thrust load generated when a fluid passes and a centrifugal force generated when the rotor 40 rotates. It is necessary to have a strength that can withstand the above load, and it is necessary to make the strength as small as possible from the above. In the case of FIG. 2, the radial load is received by the bearing 60, but the load in the thrust direction applied to the bearing 60 is extended by the support shaft 12 to be supported by the support shaft 12 via the flange washer 62. And is in contact with the bearing 60. Here, the support shaft portion 12 and the bearing 60 are directly in contact with each other via the flange washer 62, but a collar (not shown) is interposed in the middle because the support shaft portion 12 is shortened without extending. You may make it contact.

The shaft 30 penetrates a rotor 40 rotating inside the stator 20, and both ends are fixed to the support shaft portion 12 of the frame 10. In the case of FIG.
An enlarged diameter step portion 31 is formed at an intermediate portion of the shaft 30 on which the shaft 0 is mounted, and a bearing 50 is in contact with an end face of the enlarged diameter step portion 31 via a shaft washer 51. This bearing 50 is the same as that of FIG.
Although a load capable of receiving loads in both radial directions may be used, a load in the thrust direction applied to the bearing 50 is also supported by the shaft 30 via the shaft washer 51, so that it is possible to withstand a larger force. .

In the rotor 40, a spiral groove 42 is formed in an armature 41 as a main body, and bearings 50 and 50 are provided on both end faces in the axial direction.
A concave portion 43 in which 60 is provided by press fitting or the like is formed. As shown in FIG. 4, in this case, the spiral groove 42 is formed on the surface of the armature 41 and is provided in the axial end face of the armature 41 so as to be open. However, the opening is formed at a portion that does not interfere with the recess 43 or the flange 61 shown in FIG. Under such conditions, the spiral groove 42 can be formed to a desired depth and width.

On the surface of the armature 41, four permanent magnets 44, not shown here, are embedded,
The rotor 40 rebounds from the coil wound on the stator 20.
Is rotated. Any number of permanent magnets 44 may be provided.

In FIGS. 1 and 3, the bearing 50 can support, for example, a load in the radial direction and a load in the thrust direction, such as an angular contact ball bearing. Here, in this bearing 50, the outer race is press-fitted into the concave portion 43 of the rotor 40 and fixed, and the inner race is fixed to the shaft 30.

In FIG. 2, the bearing 60 is capable of supporting a load in the radial direction, is formed of resin, has a flange 61 abutting on the axial end surface of the rotor 40, and
0 is press-fitted and fixed in the concave portion 43. Further, the frame 10 is abutted via a flange washer 62 having the same size as the flange 61 so as to support a load in the thrust direction.

The shaft washer 51 and the flange washer 62 are desirably formed of a material that does not easily generate a contact frictional force with the frame.

The operation of the motor according to the present invention will be described below.

In FIGS. 1 to 3, when this motor is placed in a fluid, for example, water, and a drive source (not shown) is input, the coil 21 of the stator 20 and the permanent magnet 4 of the rotor 40 are input.
Due to the repulsion with 4, the rotor 40 starts rotating.

Here, the rotor 20 is connected to the first frame 10
When rotating clockwise as viewed from the first side, the water between the spiral grooves 42 is moved by the spiral grooves 42 and the first frame 1
A water stream is drawn in from the opening 11 of the first frame 01 and discharged from the opening 11 of the second frame 102.

In the case of FIG. 1, the bearing 50 receives a radial load and a thrust load due to the reaction force of the water flow.

In the case of FIG. 2, the bearing 60 receives a load in the radial direction, and the load in the thrust direction is supported by the support shaft portion 12 of the frame 10.

In the case of FIG. 3, the bearing may be the same as the bearing 50 of FIG. 1, but since the load in the thrust direction is supported by the enlarged diameter step portion 31 formed on the shaft 30, the composite receiving the load in the radial direction. An integrated type such as resin, oilless metal, etc. may be used.

Therefore, when this motor is fixedly used, it can be used as a submersible pump for supplying water, and when attached to a boat or the like, it can be used as a water propulsion board that moves from right to left in this figure.

[0035]

As described above, according to the first aspect of the present invention, the rotor is rotatable via shafts having both ends fixed to the frame via bearings, and the center of the opening is formed. Is formed with a small support shaft that directly fixes the shaft, making it possible to increase the opening area of the frame, allowing a large amount of fluid to pass per unit time, and rotating only the rotor. As a result, at least the weight of the shaft is reduced and the rotational weight is reduced, so that the rotational driving force can be reduced.

Therefore, it is possible to provide a motor having a high performance while allowing a large amount of fluid to pass per unit time and requiring a small rotational driving force. According to the second aspect of the present invention, in addition to the effect of the first aspect, it is not necessary to form another object at a position where the fluid obstructs, so that the fluid can be efficiently passed.

According to the third aspect of the invention, in addition to the effects of the first and second aspects, the resin bearing having the flange is in contact with the frame via the washer, and the rotating weight is reduced. It is lighter and prevents wear due to rotational contact friction,
The load in the thrust direction is supported by the frame, so that the rotor can be more stably rotated, and noise due to rotational contact can be suppressed and lubrication can be reduced.

According to the fourth aspect of the present invention, in addition to the effects of the first and second aspects, the bearing comes into contact with the end of the enlarged diameter step portion formed on the shaft via the washer, and the rotational contact friction is applied. In addition to preventing wear, the load in the thrust direction is supported by the shaft, and the rotor can stably rotate.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of one embodiment of a motor according to the present invention.

FIG. 2 is a cross-sectional view of a modified embodiment of the motor according to the present invention.

FIG. 3 is a cross-sectional view of a modified embodiment of the motor according to the present invention.

FIG. 4 is an overall perspective view of a rotor to which a shaft is attached, which is used in the motor according to the present invention.

FIG. 5 is a cross-sectional view of a conventional motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Frame 101 1st frame 102 2nd frame 11 Opening 12 Spindle part 20 Stator 30 Shaft 40 Rotor 42 Helical groove 50, 60 Bearing 51, 62 Washer

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) F04D 29/18 101 F04D 29/18 101Z H02K 5/132 H02K 5/132 5/167 5/167 A F term (Reference) 3H022 AA01 BA03 BA04 BA06 CA13 CA15 CA50 DA11 DA13 3H033 AA01 BB01 BB08 BB12 CC05 CC06 DD03 EE11 EE19 5H605 BB06 CC03 CC05 CC10 DD05 DD09 EA15 EB05 EB06 FF06 GG18

Claims (4)

[Claims] 1. A stator is sandwiched and fixed from both sides by a first frame and a second frame each having an opening, and a rotor is disposed inside the stator, and an outer peripheral portion of the rotor is provided. A motor in which a spiral groove is formed, and a fluid is sucked from one of the openings of the first frame or the second frame and discharged from the other of the openings by rotation of the rotor. A motor, which is rotatably supported by a shaft via a bearing, and both ends of the shaft are fixed to the first frame and the second frame, respectively. 2. The motor according to claim 1, wherein the bearings are provided at both ends of the rotor in the axial direction. 3. The motor according to claim 2, wherein the bearing is made of a resin with a flange, is fixed to the rotor, and comes into contact with the frame via a washer. 4. The system according to claim 2, wherein the bearing is fixed to the rotor, and abuts an end face of a step portion formed at an intermediate portion of the shaft via a washer. motor.