JP3969418B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine in which a rotor is disposed on the inner peripheral side of a stator.

  A conventional device is configured by interposing between a permanent magnet fixed to the inner peripheral surface of a yoke and an armature, and press-fitting a guide cylinder made of a non-magnetic thin plate material into the inner peripheral surface of the permanent magnet. there were. This guide tube prevents the armature from coming into contact with the permanent magnet and scratching or deforming the surface when inserting the armature into the inner periphery of the permanent magnet, and smooth rotation with low cogging torque. There has been a permanent magnet type DC servo motor that can perform the above (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 63-220552 (page 1-2, FIG. 1)

  In the conventional apparatus, the guide tube made of a non-magnetic material disposed on the inner peripheral surface of the permanent magnet is disposed in a gap in which the permanent magnet and the magnetic pole of the amateur face each other in the radial direction. If the gap dimension in the radial direction of the magnetic pole of the amateur is reduced and the gap dimension is the same as when the guide cylinder is not provided, the dimension of the gap will be increased by the provision of the guide cylinder. There is a problem that the performance such as the output of the apparatus is lowered due to the expansion of the dimension of the gap.

  The present invention has been made to solve the above-described problems, and forms a guide portion for inserting the rotor on the inner peripheral side of the stator without enlarging the size of the gap. Therefore, an object of the present invention is to obtain a rotating electrical machine that is excellent in performance such as output and can suppress the occurrence of scratches and deformations on the surface of a stator or rotor.

The present invention includes a stator having magnetic poles formed on an inner peripheral surface of a frame, and a rotor having a magnetic pole that is disposed through a gap between the inner peripheral surface of the magnetic poles and the magnetic pole in the radial direction. In the rotating electrical machine provided, the frame has a bottomed shape that does not have a hole in a bottom portion in which a housing portion that accommodates a first bearing that supports one side of the shaft of the rotor is integrally formed, and the frame Has an opening, in which the rotor is rotatably supported via a second bearing that supports the other side of the shaft, and a bracket that is assembled integrally with the rotor is disposed. Among the vicinity of the axial end of the magnetic pole of the rotor configured to be relatively insertable into the stator from one end side in the axial direction of the magnetic pole of the stator toward the other end, A guide portion formed only on the other end side, the guide portion being radially And the guide portion has a diameter dimension that exceeds the outer diameter dimension of the rotor magnetic pole and the inner diameter of the stator magnetic pole. It is formed with a dimension smaller than the dimension, and further, the dimension of the gap with the stator where the guide portion faces in the radial direction is larger than the dimension of the gap. .

  According to the present invention, it is possible to provide a guide portion for inserting the rotor on the inner peripheral side of the stator without enlarging the size of the gap, and it is excellent in performance such as output, and the stator and the rotor A rotating electrical machine in which generation of scratches and deformation on the surface is suppressed can be obtained.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a rotating electrical machine showing a motor part of a brushless motor in which permanent magnets are arranged on the inner diameter side of the rotor, and FIG. 2 is an explanatory view showing a state when the rotor is assembled. 3 is an explanatory view of the main part of part A in FIG. In the following description, the same or corresponding parts in the drawings are denoted by the same reference numerals. In FIG. 1, an embedded magnet type brushless motor 1 in which a permanent magnet is disposed on the inner diameter side of a rotor shown as an example of a rotating electrical machine according to the present invention is a substantially cylindrical and bottomed shape formed by pressing a steel plate. On the inner peripheral surface of the frame 2, there is provided a stator 4 in which a laminated iron core 3 forming a magnetic pole formed by pressing and laminating electromagnetic steel sheets is fixed by press-fitting. The laminated iron core 3 is insulated by a slot insulator 5 made of a resin such as nylon, and a stator coil 6 made of an enameled wire is wound around the laminated iron core 3. Each coil terminal of the wound stator coil 6 is subjected to a predetermined connection by a terminal treatment body 7, and this terminal treatment body 7 engages with a slot insulator 5 and is fixed to the laminated core 3. .

A rotor 8 formed so as to be insertable on the inner peripheral side of the stator 4 is disposed via an inner peripheral surface of the laminated core 3 and a gap of 0.5 mm, for example. In the rotor 8, a laminated iron core 10 having a magnetic pole formed by pressing and laminating electromagnetic steel plates is integrally fixed to a shaft 9 by press fitting or the like, and a neodymium / iron / boron permanent is formed on the inner diameter side of the laminated iron core 10. It is an embedded magnet type in which a magnet 11 is disposed. The laminated iron core 3 and the laminated iron core 10 are disposed to face each other in the radial direction. One side of the frame 2, housing portion 13 for accommodating the first bearing 12 that supports one side of the shaft 9 is a bottomed shape formed integrally, the other side of the frame 2 has an opening 14 Yes. The opening 14 is fitted with an inlay portion 17 of a bracket 16 that rotatably supports the rotor 8 via a second bearing 15 that supports the other side of the shaft 9. It is closed.

  At the end of the laminated iron core 10 of the rotor 8 in the axial direction on the first bearing 12 side, a guide portion 18 for inserting the rotor 8 into the inner peripheral surface of the laminated iron core 3 of the stator 4 is formed. . The guide portion 18 is formed of a resin material and is disposed at a position that does not oppose the laminated core 3 of the stator 4 in the radial direction. The dimension G1 of the gap between the guide portion 18 and the slot insulator 5 of the stator 4 facing in the radial direction is larger than the gap size G2 (G1> G2), and the diameter dimension D1 of the guide portion 18 is set. Is a dimension exceeding the outer diameter D2 of the laminated core 10 of the rotor 8 and smaller than the inner diameter D3 of the laminated core 3 of the stator 4 (D3> D1> D2). A guide portion 19 for inserting the rotor 8 into the inner peripheral surface of the laminated core 3 of the stator 4 is formed at the end of the laminated core 3 of the stator 4 on the second bearing 15 side in the axial direction. ing. The guide portion 19 is formed at a position that does not face the laminated iron core 10 of the rotor 8 in the radial direction. The size G3 of the gap between the guide portion 19 and the shaft 9 of the rotor 8 facing in the radial direction is configured to exceed the size G2 of the air gap (G3> G2), and the diameter size D4 of the guide portion 19 is The outer diameter D2 of the laminated core 10 of the rotor 8 is larger than the outer diameter D2 and smaller than the inner diameter D3 of the laminated core 3 of the stator 4 (D3> D4> D2). Thus, the guide part 18 and the guide part 19 are formed at two places in the axial direction.

FIG. 2 is an explanatory view showing a state when the rotor 8 is inserted and assembled on the inner peripheral side of the laminated core 3 of the stator 4 of the brushless motor 1 of FIG. A laminated core 3 in which a stator coil 6 is wound and a terminal treatment body 7 is fixed is press-fitted and fixed to the inner peripheral surface of the frame 2. The rotor 8 is supported on the other side of the shaft 9 by a second bearing 15 fixed to the bracket 16, and is assembled integrally with the bracket 16. An inner ring of the first bearing 12 is press-fitted and fixed to one side of the shaft 9. Thus, the rotor 8 assembled integrally with the bracket 16 is directed from the opening portion 14 side of the frame 2 toward the other end side 21 from the one end side 20 in the axial direction of the laminated core 3 fixed to the frame 2. The rotor 8 is inserted and assembled relative to the stator 4.

FIG. 3 is an explanatory view of a main part of the A part of FIG. 2. When the rotor 8 is inserted, the guide part 18 formed on the rotor 8 and the guide part 19 formed on the stator 4 are The state at the time of crossing is shown. The guide portion 18 is formed on the other end side 21 in the vicinity of the axial end portion of the laminated core 10 of the rotor 8. The guide portion 19 is formed on the one end side 20 in the vicinity of the axial end portion of the laminated core 3 of the stator 4. In addition, a chamfer 22 that facilitates insertion of the rotor 8 is formed at a corner portion on the other end side 21 of the guide portion 18. Similarly, a chamfer 23 for facilitating insertion of the rotor 8 is formed at a corner portion on one end side 20 of the guide portion 19. The core piece 24 of the laminated core 3 of the stator 4 has a sag caused by pressing, and has rounded corners. The sag side 25 is laminated and laminated toward the one end side 20. The iron core 3 is configured. Similarly, the core piece 26 of the laminated core 10 of the rotor 8 has a sag by press working, and the sag side 27 is laminated toward the other end side 21 to constitute the laminated core 10. ing. The thickness of the iron core piece 24 is about 0.5 mm, the thickness of the iron core piece 26 is about 0.35 mm, and the iron core piece 26 is a thin plate with respect to the iron core piece 24.

  Next, the operation of the first embodiment configured as described above will be described. When power is supplied to the terminal processing body 7 from a control device (not shown), the terminal processing body 7 energizes the stator coil 6 having a predetermined connection (for example, three-phase Y connection), and the laminated core 3 of the stator 4. A rotating force is generated in the shaft 9 by the electromagnetic action of the laminated iron core 10 of the rotor 8 in which the permanent magnet 11 is disposed, and the shaft 9 rotates.

  The diameter dimension D1 of the guide portion 18 formed on the rotor 8 is larger than the outer diameter dimension D2 of the laminated core 10 of the rotor 8 and smaller than the inner diameter dimension D3 of the laminated core 3 of the stator 4. (D3> D1> D2), the guide portion 18 can be inserted into the inner peripheral surface of the laminated core 3, and the guide portion 18 rotates while sliding on the inner peripheral surface of the laminated core 3 of the stator 4. The child 8 is inserted and assembled. The diameter dimension D4 of the guide portion 19 formed in the slot insulator 5 of the stator 4 is larger than the outer diameter dimension D2 of the laminated core 10 of the rotor 8, and the inner diameter dimension D3 of the laminated core 3 of the stator 4. Since the dimension is less than (D3> D4> D2), the laminated core 10 of the rotor 8 can be inserted into the inner diameter surface of the guide part 19, and the guide part 19 of the laminated core 10 of the rotor 8 can be inserted. The rotor 8 is inserted and assembled while sliding on the outer peripheral surface.

The first embodiment is configured as described above, and the guide portion 18 is formed on the rotor 8. The guide portion 18 is formed at a position that does not face the laminated core 3 of the stator 4 in the radial direction. Therefore, the guide portion 18 can be provided without enlarging the dimension G2 of the gap formed so that the laminated core 3 and the laminated core 10 are opposed to each other, and the performance such as output is excellent, and the diameter dimension D1 of the guide portion 18 is Since the outer diameter dimension D2 of the laminated core 10 of the rotor 8 is larger than the inner diameter dimension D3 of the laminated core 3 of the stator 4 (D3> D1> D2), The guide portion 18 can be inserted into the inner peripheral surface of the laminated iron core 3, and the guide portion 18 can prevent the axis of the rotor 8 from falling when the rotor 8 is inserted, thereby reducing the insertion force of the rotor 8. Scratches and deformation of the stator and rotor surfaces It is possible to obtain braking has been rotating electric machine. Since such a guide portion 18 is provided, the rotation in which scratches and deformation of the surface of the stator and the rotor are suppressed without using a jig for inserting the rotor 8 on the inner peripheral surface of the laminated iron core 3. An electric machine can be obtained.

Since the guide part 18 is formed such that the dimension G1 of the gap with the stator 4 where the guide part 18 faces in the radial direction exceeds the dimension G2 of the gap (G1> G2). Even when the portion 18 is provided, it is possible to obtain a rotating electrical machine in which a gap between the stator 4 and the guide portion 18 is secured and interference of the portion is prevented.

  In addition, a guide portion 19 is formed on the stator 4, and the guide portion 19 is formed at a position that does not face the laminated core 10 of the rotor 8 in the radial direction, so that the laminated core 3 and the laminated core 10 are formed. The guide part 19 can be provided without enlarging the dimension G2 of the gap formed oppositely, and the performance such as output is excellent, and the diameter dimension D4 of the inner diameter of the guide part 19 is the laminated core of the rotor 8. 10 is larger than the outer diameter D2 of the stator 10 and smaller than the inner diameter D3 of the laminated core 3 of the stator 4 (D3> D4> D2). Can be inserted into the inner diameter surface of the guide part 19, and the guide part 19 can prevent the axis of the rotor 8 from falling when the rotor 8 is inserted, thereby reducing the insertion force of the rotor 8. Scratch and deformation of the rotor surface are suppressed Rotating electric machine can be obtained. Since such a guide portion 19 is provided, the rotation in which scratches and deformation of the surface of the stator and the rotor are suppressed without using a jig for inserting the rotor 8 on the inner peripheral surface of the laminated iron core 3. An electric machine can be obtained.

Since the guide part 19 is formed such that the dimension G3 of the gap with the rotor 8 where the guide part 19 faces in the radial direction exceeds the dimension G2 of the gap (G3> G2). Even when the portion 19 is provided, it is possible to obtain a rotating electrical machine in which a gap between the rotor 8 and the guide portion 19 is secured and interference of the portion is prevented.

  The guide portion 18 is formed on a rotor 8 configured to be relatively insertable into the stator 4 from one end side 20 in the axial direction of the laminated core 3 of the stator 4 toward the other end side 21. Since the guide portion 18 is formed on the other end side 21 in the vicinity of the end portion in the axial direction of the laminated core 10 of the child 8, the guide is provided from the one end side 20 to the other end side 21 when the rotor 8 is inserted. The part 18 acts to effectively suppress the occurrence of scratches and deformations on the surfaces of the stator 4 and the rotor 8. Since the guide portion 18 is provided at the end portion of the laminated core 10 in the axial direction, deformation of the easily deformable laminated core 3 and the end portion of the laminated core 10 can be effectively suppressed.

  The guide portion 19 is formed on the stator 4 configured so that the rotor 8 can be relatively inserted into the stator 4 from one end side 20 in the axial direction of the laminated core 3 toward the other end side 21. 4, the guide portion 19 is formed on the one end side 20 in the vicinity of the end portion in the axial direction of the laminated core 3. Therefore, the guide portion 19 extends from the one end side 20 to the other end side 21 when the rotor 8 is inserted. Acts to effectively suppress the occurrence of scratches and deformations on the surfaces of the stator 4 and the rotor 8. Since the guide portion 19 is provided at the end portion of the laminated core 3 in the axial direction, deformation of the end portions of the laminated core 3 and the laminated core 10 that are easily deformed can be effectively suppressed.

  A chamfer 22 is formed at a corner portion of the guide portion 18, and the chamfer 22 reduces the insertion force of the rotor 8 so that the rotor 8 can be inserted more smoothly, and scratches on the surface of the stator 4 and the rotor 8. The occurrence of deformation can be effectively suppressed. Moreover, the chamfer 23 is formed in the corner | angular part of the guide part 19, and there exists the same effect. In the first embodiment, the chamfer 22 and the chamfer 23 are formed on both the rotor 8 side and the stator 4 side, and the effect is further increased.

Further, a guide portion 18 is formed in the vicinity of the end portion 21 on the other end side 21 of the laminated core 10 of the rotor 8, and a guide portion 19 is formed in the vicinity of the end portion 20 on the one end side 20 of the laminated core 3 of the stator 4, Guide portions 18 and 19 are formed in two axial directions. When the rotor 8 is inserted, the guide portions 18 and 19 act together to damage the surface of the stator 4 and the rotor 8. And the occurrence of deformation can be effectively suppressed. In addition, since the guide part 18 and the guide part 19 were formed, in order to be able to insert the rotor 8, it is formed so that D3> D4> D1> D2. Moreover, since it is the guide part 18 and the guide part 19 provided in the axial direction both ends of the laminated iron core 3, the fall of the axial center of the rotor 8 is suppressed effectively, and a big effect can be acquired. In addition, you may provide a guide part in the internal peripheral surface of the terminal processing body 7 of the stator 4, and you may provide three or more guide parts in an axial direction.

  The magnetic pole of the stator 4 is composed of a laminated iron core 3, and the magnetic pole is configured such that the rotor 8 can be inserted relatively from one end side 20 to the other end side 21 in the axial direction of the magnetic pole. At the same time, the withdrawal side 25 of the core piece 24 of the laminated core 3 is arranged toward the one end side 20, so that the insertion force of the rotor 8 is reduced by the withdrawal side 25 and the rotor 8 is smoothly inserted. This can effectively suppress the occurrence of scratches and deformations on the surfaces of the stator 4 and the rotor 8.

  The magnetic pole of the rotor 8 is composed of a laminated iron core 10, and the magnetic pole can be relatively inserted into the stator 4 from one end side 20 to the other end side 21 in the axial direction of the magnetic pole of the stator 4. In addition, since the sag side 27 of the core piece 26 of the laminated core 10 is disposed toward the other end side 21, the sag side 27 reduces the insertion force of the rotor 8, and the rotor. 8 can be smoothly inserted, and the occurrence of scratches and deformations on the surfaces of the stator 4 and the rotor 8 can be effectively suppressed.

Since the frame 2 has a bottomed shape in which a housing portion 13 that houses a first bearing 12 that supports one side of the shaft 9 of the rotor 8 is integrally formed, the frame 2 has a bottom portion on the first bearing 12 side of the frame 2. Since there is no hole and the rotor 8 cannot be inserted using a jig that supports the one side of the shaft 9, since the guide portion 18 and the guide portion 19 are provided in the present invention, the jig is used. Thus, the rotor 8 can be inserted and assembled without any damage on the surface of the stator 4 or the rotor 8, and the occurrence of deformation can be suppressed. Since the hole portion is not provided in the housing portion 13, parts such as a cap for closing the hole portion for ensuring water resistance and the like are not necessary and can be configured at low cost.

  The frame 2 has an opening 14, and a bracket 16 that rotatably supports the rotor 8 via a second bearing 15 that supports the other side of the shaft 9 is disposed in the opening 14. Since the part 14 side is closed by the bracket 16 and the jig for inserting the rotor 8 cannot be used easily, in the present invention, since the guide part 18 and the guide part 19 are provided, it is possible to rotate without using the jig. The child 8 can be inserted and assembled, and the occurrence of scratches and deformations on the surfaces of the stator 4 and the rotor 8 can be suppressed. In particular, when the frame 2 has a bottomed shape and no holes, it is difficult to use a jig for inserting the rotor 8 because both axial sides of the frame 2 are closed. It is possible to suppress the occurrence of scratches and deformations on the surfaces of the stator 4 and the rotor 8 without using a jig, and a further great effect can be obtained.

  In a brushless motor 1 constituting a rotating electrical machine, the magnetic poles of a stator 4 and a rotor 8 are constituted by a laminated iron core 3 and a laminated iron core 10, and a permanent magnet 11 is disposed on the inner diameter side of the laminated iron core 10 of the rotor 8. Since the magnetic poles are both composed of laminated iron cores, it is difficult to smoothly insert the rotor 8, and the permanent magnet 11 is disposed on the inner diameter side. The dimension to the outer shape of the laminated core 10 is small, and the laminated core 10 is easily deformed when the rotor 8 is inserted. Since the iron core piece 26 is formed of a thin plate with respect to the iron core piece 24, it is more easily deformed. Further, since the neodymium / iron / boron permanent magnet 11 having a strong magnetic force is used, the magnetic force is strong, and the permanent magnet 11 may be magnetized before the rotor 8 is inserted. Occasionally, scratches and deformations are easily caused by the attractive force of the magnetized permanent magnet 11. Even in the embedded magnet type rotating electrical machine having such a configuration, by providing the guide portion of the present invention, the performance such as output is excellent, and the surface of the stator 4 and the surface of the rotor 8 when the rotor 8 is inserted is excellent. It can be set as the rotary electric machine by which generation | occurrence | production of the damage | wound and deformation | transformation was suppressed effectively.

  In the rotating electrical machine 1 having the permanent magnet 11 disposed on the stator 4 or the rotor 8 and having the permanent magnet 11 pre-magnetized before the rotor 8 is inserted on the inner peripheral side of the stator 4. In particular, the insertion force of the rotor 8 increases due to the attractive force of the permanent magnet 11 and is easily damaged and deformed, and a great effect can be obtained by applying the present invention.

Embodiment 2. FIG.
The second embodiment will be described with reference to FIG. FIG. 4 is a cross-sectional view of a rotating electrical machine showing a motor part of a brushless motor in which permanent magnets are arranged on the outer peripheral surface side of the rotor. In the following description, the same or corresponding parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. The brushless motor 1 shown in FIG. 4 differs from that of the first embodiment in that the rotor 8 is different. In the rotor 8, a ferrite permanent magnet 11 that forms a magnetic pole on the outer peripheral surface of a shaft 9 is fixed by an adhesive. The outer peripheral surface of the permanent magnet 11 is covered with a cover 30 made of a stainless steel thin pipe in order to prevent damage to the permanent magnet 11 and scattering due to centrifugal force. As in the first embodiment, the guide portion 18 is disposed at the other end side 21 of the permanent magnet 11 that forms a magnetic pole, at a position that does not face the laminated core 3 of the stator 4 in the radial direction. The guide part 19 is also configured in the same manner as in the first embodiment. In the second embodiment, the outer diameter D2 of the magnetic pole of the rotor 8 is indicated by the outer dimension D2 of the cover 30 including the cover 30 covering the permanent magnet 11. The relationship between dimensions, that is, G1> G2, D3>D1> D2, G3> G2, and D3>D4> D2 described in the first embodiment are also configured in the same manner as in the first embodiment, and the rotor 8 Since the insertion into the stator 4 is the same as in the first embodiment, detailed description thereof is omitted.

As described above, in the second embodiment, the outer peripheral surface of the permanent magnet 11 is covered with the cover 30, and the guide portion 18 and the guide portion 19 of the present invention are formed. A rotating electrical machine in which generation of scratches and deformation on the surface of the laminated iron core 3 is suppressed can be obtained, and there is no enlargement of the size of the gap due to the formation of the guide portion 18, and there is no deterioration in performance such as output of the apparatus. A rotating electrical machine can be obtained. In addition, about the part of the structure similar to Embodiment 1, the same effect can be acquired. The cover 30 may be made of a resin material such as a heat shrinkable tube. Further, the guide portion 18 may be formed by punching a stainless steel thin plate by press working. Since the punching sagging of the press working acts as the chamfer 22, the punching sagging side faces the other end 21. It is good to arrange.

Embodiment 3 FIG.
A third embodiment will be described with reference to FIG. FIG. 5 is a cross-sectional view of a rotating electrical machine showing a brushed motor for an electric power steering device of a vehicle. In FIG. 5, a motor 41 with a brush constituting a rotating electric machine is formed of a resin material with a ferrite permanent magnet 42 forming a magnetic pole on the inner peripheral surface of a substantially cylindrical bottomed frame 2 formed by pressing a steel plate. The stator 4 is held by the holder 43 and fixed to the inner peripheral surface of the frame 2 by press-fitting. The rotor 8 is disposed via an inner peripheral surface of the permanent magnet 42 and a predetermined gap. In the rotor 8, a laminated iron core 10 that forms a magnetic pole formed by pressing and laminating electromagnetic steel plates is integrally fixed to a shaft 9 by press fitting or the like, and an armature coil 45 is wound around a slot 44 of the laminated iron core 10. Yes. The amateur coil 45 is connected to a commutator 46 fixed to the shaft 9, and a brush 47 is in sliding contact with the outer peripheral surface of the commutator 46. The permanent magnet 42 and the laminated iron core 10 are disposed to face each other in the radial direction. One side of the frame 2, housing portion 13 for accommodating the first bearing 12 that supports one side of the shaft 9 is a bottomed shape formed integrally, the other side of the frame 2 has an opening 14 Yes. An inlay portion 17 of a bracket 16 that rotatably supports the rotor 8 is fitted to the opening portion 14 via a second bearing 15 that supports the other side of the shaft 9. It is closed.

A guide portion 18 for inserting the rotor 8 into the inner peripheral surface of the permanent magnet 42 is formed at the end of the laminated core 10 of the rotor 8 on the first bearing 12 side in the axial direction. The guide portion 18 is formed of a resin material and is disposed at a position that does not face the permanent magnet 42 in the radial direction. The gap G1 between the guide portion 18 and the holder 43 facing in the radial direction is configured to exceed the gap size G2 (G1> G2), and the diameter D1 of the guide portion 18 is equal to that of the laminated core 10. The outer diameter dimension D2 is larger than the inner diameter dimension D3 of the permanent magnet 42 (D3>D1> D2). The rotor 8 is supported on the other side of the shaft 9 by a second bearing 15 fixed to the bracket 16, and is assembled integrally with the bracket 16. An inner ring of the first bearing 12 is press-fitted and fixed to one side of the shaft 9. Thus, the rotor 8 assembled integrally with the bracket 16 is inserted and assembled from the opening 14 side of the frame 2 toward the other end side 21 from one end side 20 of the permanent magnet 42. The guide portion 18 is formed on the other end side 21 in the vicinity of the axial end portion of the laminated core 10 of the rotor 8. In addition, a chamfer 22 that facilitates insertion of the rotor 8 is formed at a corner portion on the other end side 21 of the guide portion 18.

  Next, the operation of the third embodiment configured as described above will be described. When power is supplied to the brush 47 from a control device (not shown), the armature coil 45 is energized through the commutator 46 and is applied to the shaft 9 by electromagnetic action between the permanent magnet 42 of the stator 4 and the laminated core 10 of the rotor 8. A rotational force is generated. This rotational force can assist the steering force of the steering. The diameter D1 of the guide portion 18 formed on the rotor 8 is larger than the outer diameter D2 of the laminated core 10 of the rotor 8, and smaller than the inner diameter D3 of the permanent magnet 42 of the stator 4. (D3> D1> D2), the guide portion 18 can be inserted into the inner peripheral surface of the permanent magnet 42, and the guide portion 18 rotates while sliding on the inner peripheral surface of the permanent magnet 42 of the stator 4. The child 8 is inserted and assembled.

The third embodiment is configured as described above, and the guide portion 18 is formed on the rotor 8, and the guide portion 18 is formed at a position that does not face the permanent magnet 42 of the stator 4 in the radial direction. Therefore, the guide part 18 can be provided without enlarging the dimension G2 of the gap formed so that the permanent magnet 42 and the laminated core 10 face each other, and the performance such as output is excellent, and the diameter dimension D1 of the guide part 18 is Since the outer diameter dimension D2 of the laminated core 10 of the rotor 8 is larger than the inner diameter dimension D3 of the permanent magnet 42 of the stator 4 (D3> D1> D2), The guide portion 18 can be inserted into the inner peripheral surface of the permanent magnet 42, and the guide portion 18 can suppress the tilting of the axis of the rotor 8 when the rotor 8 is inserted, thereby reducing the insertion force of the rotor 8. On the inner peripheral surface of the permanent magnet 42, the rotor 8 Without using a jig to be inserted, it is possible to obtain a rotating electric machine generating the surface scratches or deformation of the permanent magnets 42 and laminated core 10 is suppressed.

Since the guide part 18 is formed such that the dimension G1 of the gap with the stator 4 where the guide part 18 faces in the radial direction exceeds the dimension G2 of the gap (G1> G2). Even when the portion 18 is provided, it is possible to obtain a rotating electrical machine in which a gap between the stator 4 and the guide portion 18 is secured and interference of the portion is prevented.

  The guide portion 18 is formed on the rotor 8 configured to be relatively insertable into the stator 4 from one end side 20 in the axial direction of the permanent magnet 42 of the stator 4 toward the other end side 21. Since the guide portion 18 is formed on the other end side 21 in the vicinity of the end portion in the axial direction of the laminated core 10 of the child 8, the guide is provided from the one end side 20 to the other end side 21 when the rotor 8 is inserted. The part 18 acts to effectively suppress the occurrence of scratches and deformations on the surfaces of the permanent magnet 42 and the laminated core 10. Since the guide portion 18 is provided at the end of the laminated core 10 in the axial direction, deformation of the end of the laminated core 10 that is easily deformed can be effectively suppressed.

  A chamfer 22 is formed at the corner of the guide portion 18, and the insertion force of the rotor 8 is reduced by the chamfer 22 so that the rotor 8 is inserted more smoothly, and scratches on the surfaces of the permanent magnet 42 and the laminated iron core 10 The occurrence of deformation can be effectively suppressed.

Since the frame 2 has a bottomed shape in which a housing portion 13 that houses a first bearing 12 that supports one side of the shaft 9 of the rotor 8 is integrally formed, the frame 2 has a bottom portion on the first bearing 12 side of the frame 2. Since there is no hole and the rotor 8 cannot be inserted using a jig that supports the one side of the shaft 9, since the guide portion 18 is provided in the present invention, the rotor is used without using the jig. 8 can be inserted and assembled, and the occurrence of scratches and deformation on the surfaces of the permanent magnet 42 and the laminated core 10 can be suppressed.

  The frame 2 has an opening 14, and a bracket 16 that rotatably supports the rotor 8 via a second bearing 15 that supports the other side of the shaft 9 is disposed in the opening 14. Since the part 14 side is closed by the bracket 16 and the jig for inserting the rotor 8 cannot be used easily, the guide part 18 is provided in the present invention, so the rotor 8 can be inserted without using a jig. As a result, the surface of the permanent magnet 42 and the laminated core 10 can be prevented from being damaged or deformed. In particular, when the frame 2 has a bottomed shape, both sides in the axial direction of the frame 2 are closed, so that a jig for inserting the rotor 8 cannot be used, and according to the present invention, a greater effect can be obtained. Can do.

In the above description, the motor is described as the rotating electric machine, but it goes without saying that the same effect can be obtained even with a generator.

It is sectional drawing of the rotary electric machine which shows Embodiment 1 of this invention. It is explanatory drawing which shows the state at the time of the assembly | attachment of the rotor which shows Embodiment 1 of this invention. It is principal part explanatory drawing of the A section of FIG. 2 which shows Embodiment 1 of this invention. It is sectional drawing of the rotary electric machine which shows Embodiment 2 of this invention. It is sectional drawing of the rotary electric machine which shows Embodiment 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Brushless motor (rotary electric machine), 2 Frame, 3 Laminated iron core (magnetic pole), 4 Stator, 8 Rotor, 9 Shaft, 10 Laminated iron core (magnetic pole), 11 Permanent magnet, 12 First bearing, 13 Housing part, 14 Opening, 15 Second bearing, 16 Bracket, 18 Guide part, 19 Guide part, 20 One end side, 21 Other end side, 22 Chamfering, 23 Chamfering, 24 Iron core piece, 25 Pull out side, 26 Iron core piece, 27 Pull out Side, 30 cover, 41 brushed motor (rotary electric machine), 42 permanent magnet (magnetic pole).

Claims (7)

A rotating electrical machine comprising: a stator having magnetic poles formed on the inner peripheral surface of a frame; and a rotor having a magnetic pole disposed in the inner peripheral surface of the magnetic pole via a gap and opposed to the magnetic pole in the radial direction The frame has a bottomed shape in which a housing portion for housing a first bearing that supports one side of the shaft of the rotor is integrally formed and does not have a hole in the bottom portion, and the frame has an opening portion. The rotor is rotatably supported through a second bearing that supports the other side of the shaft, and a bracket that is assembled integrally with the rotor is disposed in the opening. Near the other end side of the vicinity of the end portion in the axial direction of the magnetic pole of the rotor configured to be relatively inserted into the stator from one end side in the axial direction of the magnetic pole of the stator toward the other end side. A guide portion formed only in the radial direction. The guide part is formed at a position not facing the magnetic pole of the stator, and the diameter of the guide portion exceeds the outer diameter of the magnetic pole of the rotor and is less than the inner diameter of the magnetic pole of the stator. Further, the gap between the guide portion and the stator where the guide portion faces in the radial direction is formed to be larger than the gap. Rotating electric machine.
The guide portion is formed in a stator configured such that the rotor can be relatively inserted from one end side in the axial direction of the magnetic pole toward the other end side, and in the vicinity of the end portion in the axial direction of the magnetic pole of the stator of the rotating electrical machine according to claim 1, characterized in that the guide portion is formed on the one end side. The rotating electrical machine according to claim 1 or 2, wherein the guide portion has chamfered corners. The rotating electrical machine according to any one of claims 1 to 3 , wherein the guide portion is formed at a plurality of locations in the axial direction. The magnetic pole of the stator is composed of a laminated core, and the magnetic pole is configured such that the rotor can be inserted relatively from one end side to the other end side in the axial direction of the magnetic pole, and the laminated core The rotating electrical machine according to any one of claims 1 to 4 , wherein a sag side of the iron core piece is disposed toward the one end side. The magnetic pole of the rotor is composed of a laminated iron core, and the magnetic pole is configured to be relatively insertable into the stator from one end side to the other end side in the axial direction of the magnetic pole of the stator, The rotating electrical machine according to any one of claims 1 to 5 , wherein a sag side of the core piece of the laminated core is disposed toward the other end side. The rotating electrical machine is an embedded magnet type in which the stator and the magnetic poles of the rotor are constituted by a laminated iron core, and a permanent magnet is disposed on the inner diameter side of the laminated iron core of the rotor. The rotating electrical machine according to any one of claims 1 to 6 .

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