JPH0956095A - Synchronous motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily manufacture and assemble the bind of a synchronous motor. SOLUTION: The rotor 2 of a synchronous motor is provided with a magnet 7 on the outer periphery of a core section 6 and a bind 10 on the outer periphery of the magnet 7. The bind 10 is constituted of split binds 11 which are formed in a circular arcuate shape obtained when a cylinder having an inside diameter nearly equal to the outside diameter of the magnet 7 is split into a plurality of parts and inclined sections 12 are formed at both end sections of each split bind 11. A cap-like plate 8 is provided with pressing sections 8a having inclined surfaces 13 matching the inclined parts 12 and the split binds 11 are press-contacted with the magnet 7 by means of the inclined sections 12 when the sections 12 are pressed in the axial direction by the pressing section 8a of the plate 8. The plate 8 is fixed to the core section 6 with screws fastened in the threaded holes 9 of the section 6 through the holes 14 of the plate 8. Since the binds 11 are split into small sizes, the binds 11 can be handled easily and, in addition, no such a process as the shrinkage fitting, press-fitting, etc., is required.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synchronous motor, and more particularly to a synchronous motor having an improved binding installed on a rotor.

[0002]

2. Description of the Related Art As a conventional synchronous motor, for example, FIG.
There is one as shown in 4. This is composed of a stator 101, a rotor 102, and a shaft 103, and a gap 104 is provided between the stator 101 and the rotor 102. The slot 1 is provided on the inner peripheral surface side of the stator 101.
No. 05 is provided, and a primary winding (not shown) is provided in each slot 105. In addition, the rotor 102 includes a core portion 106 and a magnet 107, and the outer periphery of the magnet 107 is installed by surrounding a non-magnetic bind 108 formed in a cylindrical shape. That is, the magnet 107 of the synchronous motor
Is subjected to forces such as centrifugal force due to rotation and tensile force due to output, so it may be damaged or move. In order to prevent the damage and the movement, a non-magnetic bind 108 formed in a cylindrical shape is installed on the outer circumference of the magnet 107 by shrink fitting or press fitting.

[0003]

However, in such a conventional synchronous motor, since the bind 108 formed in a cylindrical shape is shrink-fitted on the outer periphery of the magnet 107 and installed by a method such as press fitting, It is difficult to manufacture the bind 108, and there is a problem that it is difficult to make a particularly large bind. In addition, there is a problem that the output is reduced by providing the binding, as compared with the output without binding. The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a synchronous motor that simplifies the manufacturing of the bind and does not reduce the output.

[0004]

Therefore, according to the present invention as set forth in claim 1, a rotor provided with magnets which are arranged on the outer periphery of the core portion so that the magnetic polarities are alternately changed in the circumferential direction, and the rotor is surrounded. In a synchronous motor including a stator arranged, a rotor includes split bindings that are disposed on the outer circumference of a magnet and are split into a plurality in the circumferential direction, and pressing portions that press the ends of the split bindings from the outside in the radial direction. , And a plate fixed to the core portion. The split bind has an arc-shaped cross section obtained by dividing a cylinder having an inner diameter substantially equal to the outer diameter of the magnet into a plurality of sections, or is formed of an elastic body and has an inner peripheral surface having a radius smaller than the outer radius of the magnet. It may have a shaped cross section.

The split binding can be composed of a magnetic split binding made of a magnetic material and a non-magnetic split binding made of a non-magnetic material.
In particular, it is preferable that the magnetic material divided binds are arranged in alignment with the magnetic poles of the magnet, and that the circumferential length of the magnetic material divided binds is formed to be larger than the peripheral length of the non-magnetic material divided binds.

Further, the split binding has an inclined surface at an end thereof, and the pressing portion of the plate has an inclination matched with the inclined surface of the split binding, so that the plate is split by axially pressing the split binding. The bind may be fixed to the core. Alternatively, the plate may be in the shape of a band having slits, and the ends of the split bindings may be wrapped with the slits open and then tightened.

According to the ninth aspect of the invention, instead of using the plate, the split binding is fixed to the core portion by a screw passing through a hole formed in the split binding. Here, the split binding includes a first split binding whose outer circumference is longer than the inner circumference and a second split binding whose inner circumference is longer than the outer circumference in a cross section perpendicular to the rotor axis. The second split bindings are alternately arranged with their circumferential edges overlapping each other, the holes are formed in the first split bindings, and the first split bindings are fixed to the core portion by screws. , The second split binding may be fixed by the edge of the first split binding.

[0008]

According to the first aspect of the present invention, the bind disposed on the outer circumference of the magnet is a split bind which is divided into a plurality of pieces in the circumferential direction, and the end portion thereof is held by the pressing portion of the plate and fixed to the core portion. It The binding is not a large cylinder, and neither shrink fitting nor press fitting is required. The split binding is a circular arc-shaped cross section obtained by dividing a cylinder with an inner diameter approximately equal to the outer diameter of the magnet into multiple parts, or an arc-shaped cross section formed of an elastic body and having an inner peripheral surface with a radius smaller than the outer peripheral radius of the magnet. As a result, each of them is small and easy to handle.

Further, by providing an inclined surface at the end of the split binding and providing an inclination corresponding to the inclined surface of the split binding on the pressing portion of the plate, the split binding allows the split binding to be provided only by axially pressing the plate. Fixed to the surface. Further, the split binding can be easily fixed by forming the plate into a band shape having a slit and wrapping the end of the split bind with the slit open and then tightening.

If a part of the split binding is made of a magnetic material split binding, the motor output is improved as compared with the case where all the split bindings are non-magnetic materials. In particular, the output is further improved by arranging the magnetic material divided bindings so as to be aligned and overlap with each other on the magnetic poles of the magnet. Alternatively, the output of the motor is further improved by making the magnetic substance divided binds have a larger circumferential length than the non-magnetic substance divided binds.

According to the ninth aspect of the present invention, since the split binding is directly fixed to the core portion by the screw passing through the hole formed in the split binding, the plate is not required and the structure becomes simpler. At that time, the split bind is configured by a first split bind whose outer circumference is longer than the inner circumference and a second split bind whose inner circumference is longer than the outer circumference, and the first split bind and the second split bind are mutually performed. When the circumferential edges are alternately overlapped with each other, only the first split bindings are fixed to the core portion by screws, so that the second split bindings are also fixed at the same time by the edges of the first split bindings. It

[0012]

Embodiments of the present invention will be described below with reference to examples. 1 to 3 show a first embodiment of the present invention. In particular, FIG. 1 is a transverse sectional view of a synchronous motor, FIG. 2 is a longitudinal sectional view of a rotor, and FIG. 3 is a perspective view of the rotor. The synchronous motor 1 includes a rotor 2 that rotates about a shaft 2a and a stator 3 that surrounds the rotor 2 so that the rotor 2 can smoothly rotate between the stator 3 and the rotor 2. Is provided with a gap 4. Further, slots 5 are provided on the inner peripheral surface side of the stator 3, and a primary winding (not shown) is wound in each slot 5.

The rotor 2 is provided with a core portion 6 and magnets (permanent magnets) 7 arranged on the outer peripheral surface thereof and having magnetic polarities alternately changed in the circumferential direction. On the outer circumference of the magnet 7, bind 1
0 is provided and held by a cap-shaped plate 8 fixed to the core portion 6. The bind 10 is a non-magnetic material,
A cylinder having an inner diameter substantially equal to the outer diameter of the magnet 7 is replaced by the magnet 7
A plurality of divided binds 11 formed in an arc shape divided into a predetermined number (8 in this embodiment) in consideration of the number of magnetic poles of
It is composed of

Inclined portions 12 are formed at both ends of the split binding 11. In addition, a pressing portion 8a having an inclined surface 13 matching the inclination of the inclined portion 12 of the split binding 11 is formed on the plate 8 which is the fixing means. The plate 8 is further provided with a plurality of holes 14 around the shaft 2a, and the core portion 6 is provided with screw holes 9 aligned with the holes 14.

In assembly, the binding portion 1 is divided by the pressing portion 8a of the plate 8 from the left and right in the axial direction in FIG.
The screw 18 is screwed into the screw hole 9 of the core portion 6 from the hole 14 of the plate 8 while pressing the inclined portion 12 of No. 1 and biasing the split bind 11 in the axial direction. As a result, the bind 10 is fixed to the core portion 6 while being pressed against the outer circumference of the magnet 7.

This embodiment is constructed as described above, and since the bind 10 is formed by dividing a cylinder made of a non-magnetic material into a plurality of parts, each of the split binds 11 becomes small. ing. Therefore, as in the past,
It is not necessary to manufacture a large cylinder, and since it does not require steps such as shrink fitting and pressure, it can be manufactured easily.

Further, in the split bind 11, the inclined portion 12 is pressed by the pressing portion 8a of the plate 8, and the plate 8
Since the magnet 7 is fixed to the core portion 6 with a screw, the magnet 7 is reliably pressed by the split binding 11, and even if it receives a centrifugal force due to rotation or a pulling force due to output, there is a risk of damage or movement. Absent. And split bind 1
Since 1 is securely fixed to the core portion 6, torque can be transmitted from the bind portion 10.

A second embodiment is shown in FIGS. 4 and 5. This shows another fixed example of the split binding in the rotor. In this embodiment, the split binding is directly screwed to the core. That is, in the rotor 2 </ b> A, the core portion 16 is provided with the flange portions 17, 17 at both ends, and the magnet 7 is arranged between the flange portions 17. The radial height h of the collar portion from the peripheral surface on which the magnet 7 is arranged is set to be equal to or less than the thickness dimension of the magnet 7. A plurality of screw holes 23 are formed on the outer periphery of the collar portion 17 at equal intervals in the circumferential direction.

The bind 20 comprises a split bind 21 formed in the same manner as the split bind 11, and is arranged side by side on the outer circumference of the magnet 7. Holes 22 are provided at both ends of each of the split bindings 21, and screw holes 23 are formed in the collar portion through the holes 22.
The split binding 21 is fixed to the core portion 16 by screwing a screw 24 into the. Other configurations are the same as those of the first embodiment. According to this embodiment, the split binding is fixed to the core portion of the rotor with a very simple structure.

FIG. 6 shows a modification of the split binding.
In the rotor 2B, the bind 30 includes a first split bind 31 having an outer circumference longer than the inner circumference and a second split bind 3 having an inner circumference longer than the outer circumference in a cross section perpendicular to the rotor axis.
2 and 2 are alternately arranged, and are installed so as to cover a magnet (not shown). That is, the first split binding 31 has an inclined surface 33 facing the inner side in the radial direction at the circumferential edge thereof, and the second split binding 32 has an inclined surface 34 facing the outer radial direction at the circumferential edge thereof. Have.

The first split binding 31 has a core portion 16A.
The screw 24 is screwed into and fixed in the screw hole 35 formed in the collar portion 17. The second split binding 32 has first and second split bindings 31 and 3 each having an inclined surface 34 facing outward.
It is pressed by the inclined surface 33 that faces the inside of 1. According to this, since only the first split binding 31 needs to be fixed, there is an effect that the fixing means is further simplified.

7 to 9 show a rotor according to the third embodiment of the present invention. FIG. 7 is a longitudinal sectional view of the rotor, and FIG.
Is a view showing a split binding in a free state in comparison with the core portion (and a magnet), and FIG. 9 is a perspective view. The rotor 2C in the third embodiment is provided with a core portion 6 and an outer peripheral surface thereof, and magnets (permanent magnets) whose magnetic polarities are alternately changed in the circumferential direction.
7 is provided. A bind 40 is further provided on the outer circumference of the magnet 7 and is held by a cap-shaped plate 46 fixed to the core portion 6.

The bind 40 is formed of a non-magnetic elastic body. As shown in FIG. 8, the bind 40 includes a plurality of (eight in this embodiment) divided binds 41 formed in an arc shape having an inner peripheral surface 41a having a radius L2 smaller than the radius L1 of the outer circumference of the magnet 7. . Cap-shaped plate 46
Includes a pressing portion 46a having an inner peripheral surface having a radius equal to the radius of the outer peripheral surface of the magnet 7 arranged on the core portion 6 plus the plate thickness of the split binding 41.

In assembling, as shown in FIG. 7, first, the pressing portions 46a of the plate 46 press the axially opposite ends of the split bind 41 to elastically deform the split bind 41 to bring it into pressure contact with the magnet 7. Then, the screw 46 that is passed through the hole 44 of the plate 46 is attached to the core portion 6
It is screwed into the screw hole 9 provided in the and fixed to the core portion 6.
As a result, the split bind 41 is fixed to the core portion 6. FIG. 9 shows a state in which the split bind 41 is pressed against the magnet 7. Other configurations are the same as those of the first embodiment.

According to this embodiment, the same effect as that of the first embodiment can be obtained, and since the split binding 41 is formed of the elastic body, the magnet 7 can be pressed more reliably. Therefore, damage and movement of the magnet can be prevented more reliably. Further, since the split bind 41 is securely fixed to the core portion, torque can be transmitted from the bind 40 portion. Further, since the divided bind 41 itself is not fixed by screws, there is no need for fine positioning, and there is an effect that it can be easily fixed.

10 to 11 show a modification of the fixing plate in the third embodiment. FIG. 10 is a longitudinal sectional view of the rotor, and FIG. 11 is an axial end view. In the rotor 2D, the split bind 41 is arranged on the outer circumference of the magnet 7. The split bind 41 is basically held by a cap-shaped plate 56. The split bind 41 is
As shown in FIG. 11, the elastic body has an arc shape having an inner peripheral surface 41a having a radius L2 smaller than the radius L1 of the outer periphery of the magnet 7. The plate 56 includes a pressing portion 56a having an inner peripheral surface having a radius equal to the radius of the outer peripheral surface of the magnet 7 arranged in the core portion 6 plus the plate thickness of the split binding 41, and a slit portion in the circumferential direction. It has 57 and is made into a band shape. The slit portion 57 is provided with coupling portions 58 and 59 on the outside of the pressing portion 56a, one coupling portion 58 is provided with a hole 60, and the other coupling portion 59 is provided with a screw hole 61 which is aligned with the hole 60. . Further, the plate 56 is further provided with a plurality of holes 64 around the shaft 2a, and the core portion 6 is provided with screw holes 9 aligned with the holes 64. Other configurations are the same as those of the first embodiment.

In assembling the bind 40, first, the divided binds 41 arranged on the outer circumference of the magnet 7 are cut into the slits 5
Wrap it in the plate 56 with 7 open. Then, in the joint portions 58 and 59, the screw 62 is screwed from the hole 60 to the screw hole 6
1 and then the slit 57 of the plate 56 is closed. As a result, both ends of the split bind 41 are pressed by the pressing portion 5.
It is pressed by 6a and pressed against the magnet. Then, in this state, the screw 18 is passed through the hole 64 of the plate 56, and the core portion 6
The plate 56 is fixed to the core portion 6 by screwing into the screw hole 9.

According to this modified example, since the plate 56 has the slit portion 57 and has a band shape, it is possible to easily cover both ends of the split bind 41 at the time of assembling, and then the connecting portion by the screw 62. There is an advantage that the split bind 41 can be pressed against the magnet 7 only by tightening.

Next, a fourth embodiment of the present invention will be shown. In this embodiment, a part of the split binding in the first embodiment is made of a magnetic material, and FIG. 12 is a transverse sectional view of the rotor in this embodiment. The rotor 2E includes a core portion 6 and magnets (permanent magnets) 7 arranged on the outer peripheral surface of the core portion 6 and having alternating magnetic polarities in the circumferential direction. A bind 70 is further provided on the outer periphery of the magnet 7 and is held by a cap-shaped plate 8 fixed to the core portion 6.

The bind 70 is composed of a magnetic material dividing bind 71 made of a magnetic material and a non-magnetic material dividing bind 72 made of a non-magnetic material, each of which is approximately equal to the outer diameter of the magnet 7. A cylinder having an inner diameter is formed into an arc shape by dividing it into a predetermined number (8 in this embodiment) in consideration of the number of magnetic poles of the magnet 7. The magnetic material divided bindings 71 and the non-magnetic material divided bindings 72 are alternately arranged in the circumferential direction, and the magnetic material divided bindings 71 are arranged so as to be aligned with and overlap the magnetic poles of the magnet 7. Other configurations are first
Is the same as the embodiment described above.

According to this embodiment, since the bind 70 uses the magnetic material divided bind 71 for a part thereof, a larger motor output can be obtained as compared with the case where the entire bind is made of a non-magnetic material. And especially, the magnetic material split binding 7
Since 1 is arranged so as to be aligned with and overlap the magnetic pole of the magnet 7, the effect of improving the output is remarkable. Alternatively, as shown in FIG. 13, the output of the motor can be further improved by making the magnetic substance divided bind 71A have a larger circumferential length than the non-magnetic substance divided bind 72A.

In the third embodiment, the slit 57
Although the plate having a plate is used to fix the split bind 41 having elasticity, other than this, for example, it is also effectively applied to fix the split bind of the non-elastic body as in the first embodiment. can do. On the contrary, the elastic split bind can be held and fixed by the plate having the pressing portion 8a having the inclined surface 13 of the first embodiment, or, as in the second embodiment, the core portion can be fixed with a screw. You may fix it directly. Further, in the fourth embodiment, the holding and fixing of the split binds are carried out by the plate having the pressing portion 8a having the inclined surface as in the first embodiment, but the present invention is not limited to this, and the second and third embodiments are carried out. It may be fixed by a plate or screw connection shown in the examples or their modifications.

[0033]

As described above, according to the present invention, the rotor of the synchronous motor is divided into a plurality of divided binds arranged on the outer periphery of the magnet arranged on the outer periphery of the core in the circumferential direction, and the end portions of the divided binds are radially arranged. Since it has a plate that has a pressing part that presses it from the outside in the direction and is fixed to the core part, the individual split binding becomes smaller instead of the conventional large cylinder,
It has the effect that it can be easily manufactured without the need for steps such as shrink fitting and press fitting. The split binding is a circular arc-shaped cross section obtained by dividing a cylinder with an inner diameter approximately equal to the outer diameter of the magnet into multiple parts, or an arc-shaped cross section formed of an elastic body and having an inner peripheral surface with a radius smaller than the outer peripheral radius of the magnet. Can be

Further, by providing an inclined surface at the end of the split binding and providing an inclination corresponding to the inclined surface of the split binding on the pressing portion of the plate, the split binding can be performed by merely pressing the plate in the axial direction. It can be aligned with the surface and easily fixed. Further, the split binding can be easily fixed by forming the plate into a band shape having a slit and wrapping the end of the split bind with the slit open and then tightening.

If a part of the split binding is a magnetic split binding made of a magnetic material, the motor output is improved. In particular, the output is further improved by arranging the magnetic material divided bindings so as to be aligned and overlap with each other on the magnetic poles of the magnet. Alternatively, the output of the motor is further improved by making the magnetic substance divided binds have a larger circumferential length than the non-magnetic substance divided binds.

Further, instead of using the plate, the structure becomes simpler by fixing the split binding directly to the core portion with a screw passing through a hole formed in the split binding. At that time, the split bind is configured by a first split bind whose outer circumference is longer than the inner circumference and a second split bind whose inner circumference is longer than the outer circumference, and the first split bind and the second split bind are mutually performed. If the circumferential edges are alternately overlapped and arranged, only the first split binding is fixed to the core portion by the screw, and the second split binding is also fixed at the same time by the edge of the first split binding. There is an advantage that

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a synchronous motor showing a first embodiment of the present invention.

FIG. 2 is a vertical sectional view of a rotor according to the first embodiment.

FIG. 3 is a perspective view of a rotor.

FIG. 4 is a vertical cross-sectional view of a rotor showing a second embodiment.

5 is a sectional view taken along line AA in FIG.

FIG. 6 is a cross-sectional view showing a modified example of split binding.

FIG. 7 is a vertical sectional view of a rotor showing a third embodiment of the present invention.

8 is a sectional view taken along line BB in FIG.

FIG. 9 is a perspective view of a rotor according to a third embodiment.

FIG. 10 is a vertical cross-sectional view of a rotor showing a modified example of the fixing plate in the third embodiment.

FIG. 11 is an axial end view showing a modified plate.

FIG. 12 is a transverse sectional view of a rotor showing a fourth embodiment.

FIG. 13 is a cross-sectional view of a rotor showing a modification of the fourth embodiment.

FIG. 14 is a diagram showing a conventional example.

[Explanation of symbols]

 1 Synchronous Motor 2, 2A, 2B, 2C, 2D, 2E Rotor 2a Shaft 3 Stator 4 Gap 5 Slot 6, 16, 16A Core Part 7 Magnet 8, 46, 56 Plate 8a, 46a, 56a Pressing Part 9 Screw Hole 10, 20, 30, 40, 70 Bind 11, 21, 41 Split Bind 12 Slope 13 Slope 14, 44, 64 Hole 17 Collar 18, 24 Screw 22 Hole 23, 35 Screw Hole 31 First Split Bind 32 Second Split binding 33, 34 Inclined surface 57 Slitting portion 58, 59 Joining portion 60 Hole 61 Screw hole 71, 71A Magnetic material split binding 72, 72A Non-magnetic material split binding

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yutaro Kaneko 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd. (72) Shigenori Kinoshita 1-1, Tanabe Nitta, Kawasaki-ku, Kawasaki, Kanagawa Fuji Inside the Electric Co., Ltd. (72) Inventor Kenji Endo 1-1 Tanabe Nitta, Kawasaki-ku, Kawasaki-shi, Kanagawa Fuji Electric Co., Ltd. (72) Nobuyuki Tokiwa 1-1 Tanabe Nitta, Kawasaki-ku, Kawasaki-shi, Kanagawa Fuji Electric Co., Ltd.

Claims (10)

[Claims] 1. A synchronous motor comprising: a rotor having magnets arranged on the outer periphery of a core portion, the magnets having magnetic polarities alternately changing in the circumferential direction; and a stator arranged so as to surround the rotor. And a plate fixed to the core portion, the split binding being arranged on the outer periphery of the split binding portion and divided into a plurality of pieces in the circumferential direction, and a pressing portion for pressing the end portion of the split binding from the outside in the radial direction. And synchronous motor. 2. The synchronous motor according to claim 1, wherein the split binding has an arc-shaped cross section obtained by dividing a cylinder having an inner diameter substantially equal to the outer diameter of the magnet into a plurality of pieces. 3. The split binding comprises a magnetic split binding made of a magnetic material and a non-magnetic split binding made of a non-magnetic material. Synchronous motor. 4. The synchronous motor according to claim 3, wherein the magnetic material split binding is arranged in alignment with the magnetic poles of the magnet. 5. The synchronous motor according to claim 4, wherein the circumference of the magnetic material divided bind is formed to be larger than the circumference of the non-magnetic material divided bind. 6. The split binding is formed of an elastic body,
The synchronous motor according to claim 1, wherein the synchronous motor has an arcuate cross section having an inner peripheral surface having a radius smaller than an outer peripheral radius of the magnet. 7. The split binding has an inclined surface at an end thereof, and the pressing portion of the plate has an inclination matched with the inclined surface of the split binding so that the plate pushes the split binding in the axial direction. 3. The split binding is fixed to the core part by the method according to claim 1,
The synchronous motor according to 3, 4, 5 or 6. 8. The plate is formed in a band shape having a slit, and is capable of being tightened after wrapping an end portion of the split binding with the slit open. The synchronous motor according to claim 1, 2, 3, 4, 5 or 6. 9. A synchronous motor comprising a rotor provided with magnets arranged on the outer periphery of a core portion with magnetic polarities alternately changing in the circumferential direction, and a stator arranged so as to surround the rotor, wherein the rotor comprises the magnets. Characterized in that it has a plurality of split bindings arranged on the outer circumference of the split binding in the circumferential direction, and the split bindings are fixed to the core portion by screws passing through holes formed in the split bindings. A synchronous motor. 10. The split binding comprises a first split binding whose outer circumference is longer than the inner circumference and a second split binding whose inner circumference is longer than the outer circumference in a cross section perpendicular to the rotor axis. The split binds and the second split binds are alternately arranged with their circumferential edges overlapping each other, the holes are formed in the first split binds, and the first split binds are screwed to the core portion. The synchronous motor according to claim 9, wherein the second split binding is fixed by an edge of the first split binding by fixing.