JP2011041371A - Rotor for permanent magnet type rotating electrical machine, and method of assembling the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotor for permanent magnet type rotating electrical machine which does not demagnetize or degauss a permanent magnet, or does not need to cool the shaft of a rotor with a refrigerant at low temperature, when shrink-fitting a retaining ring onto the rotator shaft and does not incur drop in the assembling work efficiency due to handling of the retaining ring with a magnetic force, and to provide a method of assembling the rotor. <P>SOLUTION: In the rotor 1 for a permanent magnet type rotating electrical machine in which a permanent magnet 3 is arranged on the surface of the rotor shaft 2 and which covers the periphery of the permanent magnet 3 with a cylindrical retaining ring 4, a junction is formed at one end 4<SB>-1</SB>of the cylindrical retaining ring 4, and its inside diameter is made smaller than the inside diameter of the other cylindrical sections for shrink-fitting onto one end of the rotor shaft; and the other end 4<SB>-2</SB>is not jointed to the rotor shaft 2, thereby being left as a free end, as well as, a permanent magnet 3 is arranged in circular space formed between the inner peripheral surface of the retaining ring 4 and the rotor shaft 2. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rotor of a permanent magnet type rotating electrical machine, and more particularly to a rotor of a permanent magnet type rotating electrical machine in which a permanent magnet is arranged on the surface of a rotor shaft and covered with a retaining ring, and an assembling method thereof. .

  In a permanent magnet type rotating electrical machine having a structure in which a permanent magnet is arranged on the surface of a rotor shaft, the entire outer periphery of the permanent magnet is covered with a cylindrical retaining ring to prevent the permanent magnet from being scattered by centrifugal force during high-speed rotation. (See, for example, Patent Documents 1 and 2).

FIG. 7 is a half-cut longitudinal sectional view of a rotor of a permanent magnet type rotating electric machine described in Patent Document 1 or 2.
In FIG. 7, 1 indicates the entire rotor of the permanent magnet type rotating electric machine, 2 is a rotor shaft, 3a to 3d are permanent magnets, 4 is a holding ring, and 5a and 5b are joints.

  The holding ring 4 is formed in a cylindrical shape, joint portions 5a and 5b are formed at both ends, and permanent magnets 3a to 3d formed in an arc shape on the inner peripheral surface of the cylindrical portion are arranged in an N-pole and S-pole in the circumferential direction. Are alternately arranged and fixed with an adhesive or the like. And it is comprised so that the junction parts 5a and 5b formed in the both ends of this holding | maintenance ring 4 may be shrink-fitted on the rotor shaft 2.

  The holding ring 4 is made of a high-strength material because it is necessary to hold the permanent magnets 3a to 3d so as not to jump out by centrifugal force during operation of the permanent magnet type rotating electric machine, and magnetic force generated from the permanent magnets 3a to 3d. Is also used to pass through a stator (not shown). A magnetic material is used.

  When the rotor 1 of the permanent magnet type rotating electrical machine configured as described above is rotated at a high speed, the joint portions 5a and 5b fitted to the rotor shaft 2 of the retaining ring 4 swell due to excessive centrifugal force, and the retaining ring 4 is expanded. Is likely to come off from the rotor shaft 2 and fall off, and a sufficient allowance for shrink fitting is required to prevent this.

JP 2000-278898 A JP 2004-266919 A

  However, in the prior art described in Patent Documents 1 and 2, etc., when the retaining ring 4 is shrink-fitted onto the rotor shaft 2, the temperature of the retaining ring 4 is about 200 ° C. than the temperature of the rotor shaft 2. It is fitted to the rotor shaft 2 in a state where the inner diameters of the joint portions 5a and 5b of the holding ring 4 are widened by heating high, but it is neodymium-iron-boron or samarium-cobalt which is a material of the permanent magnets 3a to 3d. When a rare earth magnet of the type is heated to a high temperature, a phenomenon such as demagnetization in which magnetic properties deteriorate or demagnetization in which magnetism disappears occurs, and there is a problem that desired energy cannot be obtained.

For this reason, as a method of assembling a retaining ring and a rotor shaft with sufficient shrinkage allowance while suppressing the heating temperature of the retaining ring 4 at the time of shrink fitting to a temperature at which the permanent magnets 3a to 3d do not demagnetize or demagnetize. There is a so-called cold fitting method in which the rotor shaft 2 is cooled with a refrigerant such as liquid nitrogen so that the dimension of the outer diameter joint portion of the rotor shaft 2 is contracted.
However, this cold fitting method has a problem that workability deteriorates because a low-temperature refrigerant is handled in the process of cooling the rotor shaft 2.

  In addition, since the permanent magnets 3a to 3d are attached to the inner peripheral surface of the retaining ring 4 prior to the shrink-fitting operation, the entire retaining ring 4 has a magnetic force. For this reason, the holding ring 4 and the rotor shaft 2 are attracted to each other at the time of shrink fitting work, and not only the centering is difficult, but also the surrounding iron tool or the like is sucked by the holding ring 4 and the work becomes difficult. There is a problem.

  The present invention has been made to solve the above-described problem, and does not demagnetize or demagnetize the permanent magnet, and the rotor shaft can be cooled at a low temperature when the retaining ring is shrink-fitted onto the rotor shaft. It is an object of the present invention to provide a rotor of a permanent magnet type rotating electrical machine and a method for assembling the same, which does not cause a decrease in assembling workability due to cooling with a magnetic field or handling a retaining ring having magnetic force.

  In order to achieve the above object, the invention of a rotor of a permanent magnet type rotating electrical machine according to claim 1 is characterized in that a permanent magnet is arranged on the surface of the rotor shaft, and the outer peripheral portion of the permanent magnet is a cylindrical holding ring. In the rotor of a permanent magnet type rotating electrical machine that is prevented from being scattered by centrifugal force by covering with a cylindrical holding ring, the cylindrical holding ring is formed with a joint at one end thereof and the inner diameter thereof is changed to the other. It is smaller than the inner diameter of the cylindrical portion and is shrink-fitted to one end of the rotor shaft, the other end is a free end without being joined to the rotor shaft, and the inner peripheral surface of the retaining ring and the rotor shaft A permanent magnet is arranged in an annular gap formed between the two.

  According to a second aspect of the invention of the rotor of the permanent magnet type rotating electrical machine according to the second aspect of the present invention, a permanent magnet is disposed on the surface of the rotor shaft, and the outer peripheral portion of the permanent magnet is covered with a cylindrical holding ring. In a rotor of a permanent magnet type rotating electrical machine designed to prevent scattering of permanent magnets, the cylindrical holding ring is divided into two in the axial direction, and each of the divided holding rings is joined to one end portion facing each other. Forming the portion and making the inner diameter smaller than the inner diameter of the other cylindrical portion and shrink fitting to the substantially central portion of the rotor shaft, each other end is a free end without being joined to the rotor shaft, In addition, a permanent magnet is disposed in an annular gap formed between the inner peripheral surface of the retaining ring and the rotor shaft.

  Further, the invention of the method of assembling the rotor of the permanent magnet type rotating electrical machine according to claim 8 is the method of disposing a permanent magnet on the surface of the rotor shaft and covering the outer periphery of the permanent magnet with a cylindrical holding ring. In a method of assembling a rotor of a permanent magnet type rotating electrical machine that prevents the scattering of permanent magnets by centrifugal force, (i) a joint that is heat-fitted to a rotor shaft formed at one end and heated by a retaining ring. (Ii) inserting the retaining ring into the rotor shaft until the joint formed at one end of the retaining ring reaches a predetermined fitting position on the rotor shaft; iii) Cool the fitting portion between the retaining ring and the rotor shaft in a state where the retaining ring and the rotor shaft are concentrically held so that an annular gap is formed between the rotor shaft and the retaining ring. And (iv) after applying adhesive on the outer peripheral surface of the permanent magnet, And a step of inserting a permanent magnet into the annular gap between the rotor shaft and the retaining ring.

  Furthermore, the invention of the method of assembling the rotor of the permanent magnet type rotating electrical machine according to claim 9 is to place the permanent magnet on the surface of the rotor shaft and cover the outer periphery of the permanent magnet with a cylindrical retaining ring. In the method of assembling a rotor of a permanent magnet type rotating electrical machine that prevents the scattering of permanent magnets by centrifugal force, (i) each holding ring divided in two in the axial direction is heated and formed at one end. A step of increasing the inner diameter of the joint portion shrink-fitted to the rotor shaft, and (ii) the retaining ring until the joint portion formed at one end of each retaining ring reaches the fitting position at the substantially central portion on the rotor shaft. And (iii) the holding ring in a state where the holding ring and the rotor shaft are concentrically held so that an annular gap is formed between the rotor shaft and the holding ring. A process of cooling the mating portion with the rotor shaft, and (iv) bonding to the outer peripheral surface of the permanent magnet After applying the agent, a step of inserting a permanent magnet into the annular gap between the rotor shaft and the holding ring from the free end side of each holding ring.

According to the rotor of the permanent magnet type rotating electric machine of the present invention, one end of the retaining ring is shrink-fitted on the rotor shaft, and the other end not shrink-fitted is a free end that is free from thermal expansion. Since the permanent magnet is inserted and fixed in the gap between the retaining ring and the rotor shaft after shrink fitting, a rotor of a permanent magnet type rotating electrical machine with good assemblability can be obtained.
Further, by attaching the rotation balance adjusting member, it is possible to obtain a rotor of a permanent magnet type rotating electrical machine having high strength and reliability.

1 is a half-cut longitudinal sectional view of a rotor of a permanent magnet type rotating electric machine according to a first embodiment of the present invention. The half-cut longitudinal cross-sectional view of the rotor of the permanent magnet type rotary electric machine which concerns on Embodiment 2 of this invention. The half-cut longitudinal cross-sectional view of the rotor of the permanent magnet type rotary electric machine which concerns on Embodiment 3 of this invention. It is a figure which shows each part of the rotor of the permanent magnet type rotary electric machine which concerns on Embodiment 4 of this invention, (a) is a half cut longitudinal cross-sectional view of a rotor, (b) is sectional drawing of a rotor, (c). FIG. 3 is a view showing the shape of a permanent magnet. It is a figure which shows each part of the rotor of the permanent magnet type rotary electric machine which concerns on Embodiment 5 of this invention, (a) is a half cut longitudinal cross-sectional view of a rotor, (b) is sectional drawing of a rotor, (c). FIG. 3 is a view showing the shape of a permanent magnet. It is a figure which shows each part of the rotor of the permanent magnet type rotary electric machine which concerns on Embodiment 6 of this invention, (a) is a half cut longitudinal cross-sectional view of a rotor, (b) is sectional drawing of a rotor, (c). FIG. 3 is a view showing the shape of a permanent magnet. The half-cut longitudinal cross-sectional view of the rotor of the conventional permanent magnet type rotary electric machine.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, throughout each figure, the same code | symbol is attached | subjected to the same part and description is abbreviate | omitted suitably about the overlapping part.

(Embodiment 1)
Hereinafter, Embodiment 1 of the present invention will be described with reference to FIG.
FIG. 1 is a half cut longitudinal sectional view of a rotor of a permanent magnet type rotating electric machine according to Embodiment 1 of the present invention, and detailed structures of both shaft ends are omitted.

First, in FIG. 1, the structure of the rotor of the permanent magnet type rotating electrical machine according to the first embodiment will be described.
Reference numeral 1 denotes an entire rotor of a permanent magnet type rotating electric machine, 2 denotes a rotor shaft, 3a to 3d are divided into four in the axial direction, and permanent magnets are appropriately divided in the circumferential direction. Reference numeral 4 denotes a retaining ring formed in a cylindrical shape so as to cover the outer circumferences of the permanent magnets 3a to 3d, and is made of a high-strength magnetic material.

The retaining ring 4 is in concentric relation to the rotor axis 2, as the inner diameter formed at one end portion 4 _-1 is shrink-fitted to one end of the rotor shaft 2 by the joining portion 5 of D1 The other end portion _4-2 is open to the opposite side in the axial direction and is a free end so that it can freely stretch.

The cylindrical portion other than the joint 5 of the retaining ring 4 has an inner diameter D2 that can form a gap sufficient to accommodate the permanent magnet with the rotor shaft 2 (D1 <D2). . That is, an annular gap is formed between the rotor shaft 2 and the cylindrical portion of the retaining ring 4. 4 divided permanent magnets 3a~3d in the axial direction are adapted to be inserted into the annular gap from the opening of the other end 4 _-2.

Although FIG. 1 shows an example in which the permanent magnet is divided into four in the axial direction, any number of divisions other than the four divisions may be used so that the permanent magnet can be easily inserted.
Next, a method for assembling the rotor 1 of the permanent magnet type rotating electric machine according to the first embodiment will be described.

(I) First, the holding ring 4 uniformly heat the entire, to increase the inner diameter D1 of the joint 5 which is shrink-fitted to the rotor shaft which is formed at one end 4 _-1. At this time, the temperature of the rotor shaft 2 is normal temperature, and the holding ring 4 is heated to about 200 ° C. higher than the temperature of the rotor shaft 2.
(Ii) Next, the joint portion 5 formed at one end portion 4 _-1 of the retaining ring 4 to insert the holding ring 4 to the rotor shaft 2 until it reaches a predetermined fitting position on the rotor shaft 2.

(Iii) Next, the holding ring 4 and the rotor shaft 2 are connected to each other using an appropriate tool so that a substantially uniform annular gap is formed between the rotor shaft 2 and the cylindrical portion of the holding ring 4. It hold | maintains concentrically and it cools until the junction part 5 and the rotor shaft | shaft 2 of the holding | maintenance ring 4 become normal temperature. In the case of this cooling, natural cooling is preferable so that distortion does not occur. When the joint 5 and the rotor shaft 2 reach room temperature, the retaining ring 4 and the rotor shaft 2 are firmly shrink-fitted.

(Iv) Next, an adhesive such as a room temperature curable adhesive is applied to the outer peripheral surfaces of the permanent magnets 3a to 3d.
(V) Next, permanent magnets 3d, 3c, 3b and 3a are sequentially inserted into the annular gap from the free end _4-2 side of the retaining ring 4. The thicknesses of the permanent magnets 3d, 3c, 3b and 3a are selected to be slightly thinner than the annular gap size so that they can be smoothly inserted. The inner peripheral surfaces of the permanent magnets 3d, 3c, 3b and 3a and the rotor shaft There is a gap of about 1 mm to 0.5 mm between the two outer peripheral surfaces.

  In the step of inserting the permanent magnets 3d, 3c, 3b, and 3a, the magnetic pole surfaces of the permanent magnets 3d, 3c, 3b, and 3a must be aligned in a straight line in the axial direction. A “bar-shaped guide member” is inserted into the annular gap, and permanent magnets 3d, 3c, 3b, and 3a are sequentially inserted along the guide member.

(Vi) After the permanent magnet is inserted in the step (v), when a predetermined time elapses, the room temperature curable adhesive is cured, so that the permanent magnets 3d, 3c, 3b, and 3a are firmly attached to the inner peripheral surface of the holding ring 4. Fixed.

  Since the rotor of the permanent magnet type rotating electric machine according to the first embodiment is assembled through the steps (i) to (vi) described above, the permanent magnet is reduced when the retaining ring is shrink-fitted, which is a problem of the prior art. There is no problem of magnetism or demagnetization, and it is not necessary to cool with liquid nitrogen or the like in order to shrink the outer diameter of the fitting portion of the rotor shaft. Furthermore, since a permanent magnet is not attached to the retaining ring in advance as in the prior art, there is no need to handle a retaining ring with a magnetic force, and a rotor of a permanent magnet type rotating electrical machine excellent in assembly workability is obtained. Can do.

(Embodiment 2)
Hereinafter, Embodiment 2 of the present invention will be described with reference to FIG.
FIG. 2 is a half-cut longitudinal sectional view of a rotor of a permanent magnet type rotating electric machine according to Embodiment 2 of the present invention, and detailed structures of both shaft ends are omitted.

In FIG. 2, the main difference between the rotor 1 of the permanent magnet type rotating electric machine according to the second embodiment and the rotor 1 of the permanent magnet type rotating electric machine according to the first embodiment of FIG. , is divided into two in the axial direction 4b, a point which is arranged adjacent at a substantially central portion of the opposing joints 5a formed on the respective end portions 4 _-1, 5b in the axial direction of the rotor shaft 2, Others are almost the same.

Specifically, of the two divided retaining ring, the end 4 _-1 junctions 5a of one holding ring 4a is shrink-fitted to the rotor shaft 2b at a substantially central portion of the rotor shaft 2, the other holding ring 4b shrink fitted to the rotor shaft 2b junction 5b at one end 4 _-1 at approximately the center portion of the rotor shaft 2. As a result, the joint portions 5a and 5b of the retaining rings 4a and 4b are adjacent to each other, and each free end _4-2 is disposed so as to face the end portion (not shown) of the rotor shaft 2.

  Permanent magnets 3b and 3a are inserted and arranged in an annular gap between the holding ring 4a and the rotor shaft 2. Further, permanent magnets 3 c and 3 d are inserted and arranged in an annular gap between the holding ring 4 b and the rotor shaft 2.

The method of assembling the rotor 1 of the permanent magnet type rotating electric machine according to the second embodiment is substantially the same as the steps (i) to (vi) of the first embodiment, except that the retaining ring is divided into two parts. There is a slight difference in the process as described below in that the shrink fitting position of the ring is changed from one end to the center. That is,
(I) heating each holding ring 4a, 4b divided into two in the axial direction to increase the inner diameter of the joints 5a, 5b to be shrink-fitted to the rotor shaft formed at each one end;
(Ii) inserting the holding ring into the rotor shaft until the joints 5a, 5b formed at one end of each holding ring 4a, 4b reach the fitting position at the substantially central portion on the rotor shaft 2;
(Iii) Each holding ring and the rotor shaft in a state where the holding rings and the rotor shaft are concentrically held so that an annular gap is formed between the rotor shaft 2 and the holding rings 4a and 4b. The process of cooling until the joint of
(Iv) After applying adhesive on the outer peripheral surfaces of the permanent magnets 3b, 3a, 3c, 3d, from the free end side of each holding ring 4a, 4b, against the annular gap between the rotor shaft and the holding ring Inserting a permanent magnet,
(V) Next, the permanent magnets 3b, 3a, 3c, and 3d are sequentially inserted into the annular gap from the free end _4-2 side of each holding ring 4. The thicknesses of the permanent magnets 3b, 3a, 3c, and 3d are selected to be slightly smaller than the annular gap size so that they can be smoothly inserted. There is a gap of about 1 mm to 0.5 mm between the two outer peripheral surfaces.

  In the insertion process of the permanent magnets 3b, 3a, 3c and 3d, for example, a straight “bar-shaped guide member” is used so that the magnetic pole surfaces of the permanent magnets 3b, 3a, 3c and 3d are aligned in a straight line in the axial direction. Is inserted into the annular gap, and the permanent magnets 3b, 3a, 3c and 3d are sequentially inserted along the guide member.

(Vi) When a predetermined time elapses after the permanent magnet is inserted in the step (v), the room temperature curable adhesive is cured, so that the permanent magnets 3b and 3a are placed on the inner peripheral surface of the holding ring 4a and the permanent magnet 3c. And 3d are firmly fixed to the inner peripheral surface of the retaining ring 4b.

  The rotor 1 of the permanent magnet type rotating electric machine according to the second embodiment has the same effect as that of the first embodiment described above, and the holding ring 4 is divided into two in the axial direction, so that the strength of one holding ring 4 is increased. Even if there is a problem, a specific effect that a sufficient strength can be obtained can be obtained.

(Embodiment 3)
Hereinafter, Embodiment 3 of the present invention will be described with reference to FIG.
FIG. 3 is a half-cut longitudinal sectional view of a rotor of a permanent magnet type rotating electric machine according to Embodiment 3 of the present invention, and detailed structures of both shaft ends are omitted.

In FIG. 3, the main points of the rotor 1 of the permanent magnet type rotating electric machine according to the third embodiment differing from the rotor 1 of the permanent magnet type rotating electric machine according to the second embodiment of FIG. 2 are the retaining rings 4a and 4b. The rotation balance adjusting members 6a and 6b are disposed at the respective free ends _4-2 with an appropriate gap c in the axial direction, and are configured to be shrink-fitted to the rotor shaft 2, and the rest is almost the same. .

  The rotation balance adjusting members 6a and 6b are formed in a ring shape as an example, and are preferably made of a non-magnetic material that can be easily processed so as not to generate eddy currents. Further, the size of the gap g is set to be slightly larger than the amount of thermal expansion in consideration of the thermal expansion of the retaining rings 4a and 4b during the operation of the rotor 1.

  When the assembly is completed, the rotor 1, which is a rotating body, must always be placed on the bearing and rotated to check the rotation balance. The rotor 1 is usually measured by measuring vibrations at high speeds. Work such as shaving part of the holding rings on both sides is required.

In contrast, in the present embodiment 3, the holding ring 4a, 4b rotation balancing member 6a constituted with a material easily relatively processed adjacent each free end 4 _-2, so are then shrink-fitted to 6b By adjusting the rotation balance adjustment members 6a and 6b with a grinder or the like when adjusting the rotation balance, the balancing operation of the rotor 1 can be easily performed.

  As a result, in Embodiment 3, there is no need to cut the ends of the retaining rings 4a and 4b. For this reason, the strength of the retaining rings 4c and 4d is not lowered, and a rotor of a permanent magnet type rotating electrical machine that is excellent in assembling workability and highly reliable in strength can be obtained.

The third embodiment described above is not limited to the rotor 1 of the permanent magnet type rotating electric machine according to the second embodiment shown in FIG. 2, and is not limited to the permanent magnet according to the first embodiment shown in FIG. The present invention can be similarly applied to a rotor of a rotary electric machine. When applied to the first embodiment, rotation balance adjusting members 6a and 6b as shown in FIG. 3 may be attached to the free end _4-2 side of the retaining ring 4 of FIG.

(Embodiment 4)
Hereinafter, Embodiment 4 of the present invention will be described with reference to FIG.
4A is a half-cut longitudinal sectional view of a rotor of a permanent magnet type rotating electric machine according to the fourth embodiment of the present invention, FIG. 4B is a sectional view taken along line AA in FIG. FIG. 4 is a diagram showing the shape of a permanent magnet.

  In FIG. 4, the main difference between the rotor 1 of the permanent magnet type rotating electrical machine according to the fourth embodiment and the rotor 1 of the permanent magnet type rotating electrical machine according to the first embodiment is that the permanent magnet and the rotation opposite thereto. This is the point that guide portions are formed on the outer peripheral surface of the child shaft. Here, the guide portion refers to a chamfered portion in which the outer peripheral surface of the rotor shaft 2a is processed to have a polygonal cross-sectional shape over the entire length in the axial direction where the permanent magnet is disposed, and the outer peripheral surface of the rotor shaft 2a. Is a combination with a flat surface obtained by processing the surface on the inner peripheral surface side of the permanent magnets 3e to 3h facing each other.

  The retaining ring 4 and the rotor shaft 2a are formed by combining the outer peripheral surface of the rotor shaft 2a and the opposed surfaces of the permanent magnets 3e to 3h with a polygonal and flat surface instead of the circumferential surface as in the first embodiment. When the permanent magnets 3e to 3h are inserted from the openings, the circumferential direction of the permanent magnet without using the “straight rod-shaped guide member” as described in the permanent magnet insertion step (v) of the first embodiment. Can be easily positioned, and the assembly workability can be further improved.

  In FIG. 4, the example applied to the first embodiment of FIG. 1 is described, but the present invention can also be applied to the rotor of the permanent magnet type rotating electric machine according to the second and third embodiments of FIGS. 2 and 3.

(Embodiment 5)
Hereinafter, Embodiment 5 of the present invention will be described with reference to FIG.
5A is a half-cut longitudinal sectional view of a rotor of a permanent magnet type rotating electric machine according to the fourth embodiment of the present invention, FIG. 5B is a sectional view taken along line AA in FIG. FIG. 4 is a diagram showing the shape of a permanent magnet.

  In FIG. 5, the main difference between the rotor 1 of the permanent magnet type rotating electric machine according to the fifth embodiment and the rotor 1 of the permanent magnet type rotating electric machine according to the fourth embodiment is that the permanent magnet and the rotation opposite thereto. A convex portion 10 is provided on the inner diameter side of the permanent magnets 3i to 3l as a guide portion with respect to the outer peripheral surface of the rotor shaft, that is, on the surface facing the outer peripheral surface of the rotor shaft 2b, and on the outer peripheral surface of the rotor shaft 2b. The concave portion 20 is provided so as to fit smoothly with the convex portion 10 of the permanent magnets 3i to 3l, and the others are substantially the same.

  The magnet insertion according to the first embodiment is performed when the permanent magnets 3i to 3l are inserted into the annular gap by forming such a fitting portion by the concave and convex portions on the opposing surfaces of the rotor shaft 2b and the permanent magnets 3i to 3l. Without using the “straight rod-shaped guide member” as described in the step (v), the positioning of the permanent magnet in the circumferential direction becomes easy and the assembly workability can be improved as in the fourth embodiment. it can. In addition, although FIG. 5 demonstrated the example applied to Embodiment 1 of FIG. 1, it is also possible to apply to the rotor of the permanent magnet type rotary electric machine which concerns on Embodiment 2, 3 of FIG. 2, FIG.

(Embodiment 6)
Embodiment 6 of the present invention will be described below with reference to FIG.
6A is a half-cut longitudinal sectional view of a rotor of a permanent magnet type rotating electric machine according to the fourth embodiment of the present invention, FIG. 6B is a sectional view taken along line AA in FIG. 6A, and FIG. FIG. 4 is a diagram showing the shape of a permanent magnet.

  In FIG. 6, the main difference between the rotor 1 of the permanent magnet type rotating electric machine according to the sixth embodiment and the rotor 1 of the permanent magnet type rotating electric machine according to the fifth embodiment of FIG. 5 is the inner circumference of the permanent magnet. The surface and the outer peripheral surface of the rotor shaft opposed to the surface are the same, except that the permanent magnets 3m to 3p each have a concave portion and a convex portion formed on the outer peripheral surface of the rotor shaft to form a guide portion. .

  That is, the concave portion 30 is provided on the inner diameter side of the permanent magnets 3m to 3p over the entire length of the permanent magnet, and the convex portion 40 is provided on the outer peripheral surface of the rotor shaft 2c so as to fit smoothly with the concave portion 30 of the permanent magnets 3m to 3p. It is a thing.

Also in the case of the sixth embodiment, when the permanent magnets 3m to 3p are inserted into the annular gap, as in the fourth and fifth embodiments, the permanent magnet circle is not used without using the “straight rod-shaped guide member”. Positioning in the circumferential direction is facilitated, and assembly workability can be improved.
In addition, although FIG. 6 demonstrated the example applied to Embodiment 1 of FIG. 1, it is also possible to apply to the rotor of the permanent magnet type rotary electric machine which concerns on Embodiment 2, 3 of FIG. 2, FIG.

  DESCRIPTION OF SYMBOLS 1 ... Rotor of permanent magnet type rotary electric machine, 2, 2a-2c ... Rotor shaft, 3a-3p ... Permanent magnet, 4, 4a, 4b ... Retaining ring, 5, 5a, 5b ... Joint part, 6a, 6b ... Rotation balance adjusting member, 10, 40 ... convex portion, 20, 30 ... concave portion.

Claims (9)

In a rotor of a permanent magnet type rotating electrical machine in which a permanent magnet is disposed on the surface of a rotor shaft and the outer periphery of the permanent magnet is covered with a cylindrical holding ring to prevent the permanent magnet from scattering by centrifugal force. ,
The cylindrical holding ring is formed with a joining portion at one end thereof, the inner diameter thereof being made smaller than the inner diameter of the other cylindrical portion, and being shrink-fitted into one end portion of the rotor shaft, and the other end portion being a rotor. Rotation of a permanent magnet type rotating electrical machine characterized in that a permanent magnet is disposed in an annular gap formed between an inner peripheral surface of a retaining ring and a rotor shaft without being joined to the shaft, and a free end. Child. In a rotor of a permanent magnet type rotating electrical machine in which a permanent magnet is disposed on the surface of a rotor shaft and the outer periphery of the permanent magnet is covered with a cylindrical holding ring to prevent the permanent magnet from scattering by centrifugal force. ,
The cylindrical holding ring is divided into two in the axial direction, and each of the divided holding rings is formed with a joint at each of the opposing one ends, and the inner diameter is made smaller than the inner diameter of the other cylindrical part. Annulus formed between the inner peripheral surface of the retaining ring and the rotor shaft, with the other end portions being free ends without being joined to the rotor shaft, and shrink-fitted to the substantially central portion of the rotor shaft A rotor of a permanent magnet type rotating electrical machine, wherein permanent magnets are arranged in the gaps.   The rotor of the permanent magnet type rotating electric machine according to claim 1, wherein guide portions are formed on the outer peripheral surfaces of the permanent magnet and the rotor shaft facing the permanent magnet, respectively.   The rotation of the permanent magnet type rotating electric machine according to claim 3, wherein the guide part has a polygonal cross-sectional shape of the outer peripheral surface of the rotor shaft and a flat inner surface side of the permanent magnet. Child.   4. The guide portion according to claim 3, wherein a convex portion extending over the entire length of the permanent magnet is provided on the inner diameter side of the permanent magnet, and a concave portion that fits the convex portion of the permanent magnet is provided on the surface of the rotor shaft. A rotor of a permanent magnet type rotating electrical machine.   The permanent part according to claim 3, wherein a concave part that extends over the entire length of the permanent magnet is provided on the inner diameter side of the permanent magnet, and a convex part that fits the concave part of the permanent magnet is provided on the surface of the rotor shaft. Magnet-type rotating electrical machine rotor.   The rotor of a permanent magnet type rotating electric machine according to any one of claims 1 to 6, wherein a rotation balance adjusting member is attached at a position adjacent to the free end side of the holding ring. A rotor of a permanent magnet type rotating electrical machine in which a permanent magnet is disposed on the surface of the rotor shaft and the outer periphery of the permanent magnet is covered with a cylindrical retaining ring to prevent the permanent magnet from being scattered by centrifugal force. In the assembly method,
(I) heating the retaining ring to increase the inner diameter of the joint that is shrink-fitted to the rotor shaft formed at one end;
(Ii) inserting the holding ring into the rotor shaft until a joint formed at one end of the holding ring reaches a predetermined fitting position on the rotor shaft;
(Iii) The fitting portion between the retaining ring and the rotor shaft is cooled in a state where the retaining ring and the rotor shaft are concentrically held so that an annular gap is formed between the rotor shaft and the retaining ring. And a process of
(Iv) After applying an adhesive to the outer peripheral surface of the permanent magnet, inserting the permanent magnet into the annular gap between the rotor shaft and the retaining ring from the free end side of the retaining ring;
Assembly method for a rotor of a permanent magnet type rotating electrical machine. A rotor of a permanent magnet type rotating electrical machine in which a permanent magnet is disposed on the surface of the rotor shaft and the outer periphery of the permanent magnet is covered with a cylindrical retaining ring to prevent the permanent magnet from being scattered by centrifugal force. In the assembly method,
(I) heating each holding ring divided in two in the axial direction to increase the inner diameter of the joint portion shrink-fitted to the rotor shaft formed at one end;
(Ii) inserting the holding ring into the rotor shaft until the joint formed at one end of each holding ring reaches the fitting position at the substantially central portion on the rotor shaft;
(Iii) The fitting portion between the retaining ring and the rotor shaft is cooled in a state where the retaining ring and the rotor shaft are concentrically held so that an annular gap is formed between the rotor shaft and the retaining ring. And a process of
(Iv) after applying an adhesive on the outer peripheral surface of the permanent magnet, from the free end side of each retaining ring, inserting the permanent magnet into the annular gap between the rotor shaft and the retaining ring;
Assembly method for a rotor of a permanent magnet type rotating electrical machine.

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