JP2007037202A - Rotor for permanent magnet embedded motor, its assembling method, and assembling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotor for a permanent magnet embedded motor, where a permanent magnet can be fixed simply within a magnet storage hole without causing damage to the permanent magnet and a general-purpose thin steel plate can be used, and an assembling device. <P>SOLUTION: The rotor 200 includes a rotor core 12 which is constituted by stacking thin steel plates 11. At end faces 12a and 12b of the rotor cores 12, recesses 204a and 204b which have depths equivalent to thicknesses of approximately two sheets of steel plates are formed in the vicinity of both openings of the magnet storage hole 16. A projection 206a is formed in the vicinity of the recess 204a by plastically transforming the inwall of the magnet storage hole 16, and a projection 206b is formed in the vicinity of the recess 204b by plastically transforming the inwall of the magnet storage hole 16. The projection 206a is composed of a pressure-welding part 206a1 which pressure-contacts with a permanent magnet 202 from the direction of its side and a projection 206a2 which projects above the end face in the direction of an arrow Z of the permanent magnet 202. The projection 206b is composed of a pressure-welding part 206b1 which pressure-contacts with the permanent magnet 202 from the direction of its side and a projection 206b2 which projects above the end face in the direction of the arrow Z of the permanent magnet 202. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a permanent magnet embedded motor rotor, an assembling method and an assembling apparatus thereof, and more specifically, an inner rotor type or outer rotor type permanent magnet embedded motor rotor in which a permanent magnet is embedded in a rotor core. The present invention relates to an assembling method and an assembling apparatus.

In general, in a rotor for a permanent magnet embedded type motor (IPM type motor), an R—Fe—B rare earth sintered magnet is provided in a plurality of magnet housing holes 3 provided in a rotor core 2 as in the rotor 1 shown in FIG. It is known that a permanent magnet 4 is housed as a field source, and the permanent magnet 4 is fixed in the magnet housing hole 3 by an adhesive.
In such a rotor 1, in the operation | work which fixes the permanent magnet 4 in the magnet accommodation hole 3, processes, such as degreasing of the rotor core 2 and the permanent magnet 4, washing | cleaning, application | coating of an adhesive agent, hardening, are required, and a manufacturing process There is a problem that there are many. Further, as shown in FIG. 26, the fixing position in the surface direction of the permanent magnet 4 (the end surface direction of the rotor core 2) varies in the magnet housing hole 3, and the motor characteristics may be deteriorated. Furthermore, when the rotor 1 reaches a high temperature when the motor is used, there is a problem in quality such that the adhesive force of the adhesive is weakened and the permanent magnet 4 is detached.
Further, when an adhesive is used for fixing the permanent magnet 4, it is difficult to separate and disassemble the rotor core 2 and the permanent magnet 4 when the rotor 1 is discarded, and there is a problem in terms of recyclability. Although the method in which the rotor 1 is put into a furnace to weaken the adhesive force of the adhesive and the rotor core 2 and the permanent magnet 4 are separated and disassembled is also used, the work requires many steps, and in addition, the rotor core The adhesive remains in 2.

  Conventionally, many techniques have been proposed in which the manufacturing process of a rotor for a permanent magnet embedded motor is reduced, the permanent magnet is firmly fixed in the magnet housing hole of the rotor core, and recyclability is taken into consideration. For example, Patent Document 1 discloses a rotor in which a permanent magnet is press-fitted into a magnet housing hole provided with a convex portion on an inner wall, and the permanent magnet is fixed by pressing the convex portion. However, according to Patent Document 1, when the permanent magnet is press-fitted into the magnet housing hole, the permanent magnet may be chipped or scraped due to burrs or the like on the inner wall of the magnet housing hole, and damage such as cracks may occur. There is. When a highly oxidizable material such as an R—Fe—B rare earth sintered magnet is used as the permanent magnet, corrosion proceeds from the damaged portion, and the effective volume of the permanent magnet is reduced, resulting in a decrease in magnetic properties. The motor characteristics may be deteriorated.

In addition, for example, Patent Document 2 discloses that the inner wall of the magnet accommodation hole is plastically deformed by press-fitting a pin having a diameter slightly larger than the opening into a through hole provided in the vicinity of the magnet accommodation hole of the rotor core. A rotor in which a caulking portion is pressed against a permanent magnet and the permanent magnet is fixed is disclosed. According to Patent Document 2, there is no fear that the permanent magnet is damaged in the manufacturing process.
JP-A-7-322538 JP 2000-184638 A

However, in the rotor disclosed in Patent Document 2, it is necessary to previously provide a pin press-fitting hole for press-fitting a pin or the like into the rotor core, and for this purpose, a new design in which a pin press-fitting hole is formed in advance at a predetermined location. Of sheet steel must be prepared.
SUMMARY OF THE INVENTION Therefore, a main object of the present invention is to provide a permanent magnet embedded motor rotor, an assembly thereof, which can easily fix a permanent magnet in a magnet receiving hole without damage to the permanent magnet and can use a thin steel plate of an existing design. A method and assembly apparatus is provided.

  In order to achieve the above-described object, a rotor for a permanent magnet embedded motor according to claim 1 includes a rotor core configured by stacking thin steel plates, a magnet receiving hole penetrating the rotor core in the axial direction, and a magnet. In a rotor for a permanent magnet embedded motor having a permanent magnet accommodated in the accommodation hole, an inner wall of the magnet accommodation hole in the vicinity of the recess is formed by forming a recess in the end surface of the rotor core in the vicinity of the opening of the magnet accommodation hole. A convex portion is formed by plastic deformation, and at least a part of the convex portion is pressed against the permanent magnet to fix the permanent magnet.

  The rotor for a permanent magnet embedded motor according to claim 2 is the rotor for a permanent magnet embedded motor according to claim 1, wherein the axial end surface of the permanent magnet accommodated in the magnet accommodation hole is more than the end surface of the rotor core. The permanent magnet is arranged so as to be located inside, and a part of the convex portion protrudes on the axial end surface of the permanent magnet.

  The rotor for a permanent magnet embedded motor according to claim 3 is the rotor for a permanent magnet embedded motor according to claim 1 or 2, wherein the rotor is an inner rotor type permanent magnet embedded motor. A permanent magnet is press-contacted by a convex part in a magnet accommodation hole so that a space may not be formed between a permanent magnet and an outer peripheral side inner wall of a magnet accommodation hole.

  The rotor for a permanent magnet embedded motor according to claim 4 is the rotor for a permanent magnet embedded motor according to claim 1 or 2, wherein the rotor is for an outer rotor type embedded permanent magnet motor. A permanent magnet is press-contacted by a convex part in a magnet accommodation hole so that a space may not be formed between a permanent magnet and a central side inner wall of a magnet accommodation hole.

  The method for assembling a rotor for a permanent magnet embedded motor according to claim 5 includes a first step of housing a permanent magnet in a magnet housing hole that passes through the rotor core in the axial direction, and a rotor core near the opening of the magnet housing hole. Forming a recess on the end surface of the magnet to plastically deform the inner wall of the magnet accommodation hole in the vicinity of the recess to form a projection, and at least a part of the projection is pressed against the permanent magnet to fix the permanent magnet Is provided.

  The method for assembling the rotor for a permanent magnet embedded motor according to claim 6 is the method for assembling the rotor for a permanent magnet embedded motor according to claim 5, wherein the first step is accommodated in the magnet accommodation hole. The permanent magnet is disposed so that the axial end face of the permanent magnet is located inside the end face of the rotor core, and in the second step, a part of the convex portion protrudes on the axial end face of the permanent magnet.

  The method for assembling a rotor for an embedded permanent magnet motor according to claim 7 is the method for assembling the rotor for an embedded permanent magnet motor according to claim 5 or 6, wherein the rotor is used for an inner rotor type embedded permanent magnet motor. In the rotor assembling method, the second step is characterized in that a concave portion is formed so as not to form a gap between the permanent magnet and the outer peripheral side inner wall of the magnet housing hole.

  The method for assembling the rotor for a permanent magnet embedded motor according to claim 8 is the method for assembling the rotor for a permanent magnet embedded motor according to claim 5 or 6, wherein the rotor is embedded in a permanent magnet embedded motor. The rotor assembly method is characterized in that, in the second step, a concave portion is formed so as not to form a gap between the permanent magnet and the inner wall on the center side of the magnet housing hole.

  The rotor assembly apparatus for a permanent magnet embedded motor according to claim 9 is a permanent magnet embedded motor in which a permanent magnet is housed in a magnet housing hole that passes through a rotor core formed by laminating thin steel plates in the axial direction. Assembly device for a rotor, a pair of holding jigs for holding a rotor core from one end surface side and the other end surface side, extending from one main surface to the other main surface of the holding jig and opening a magnet accommodation hole A through hole formed at a position corresponding to the vicinity of the portion, and a punch disposed in the through hole and forming a recess in the end surface of the rotor core in the vicinity of the opening of the magnet housing hole.

  An assembly apparatus for a rotor for an embedded permanent magnet motor according to claim 10 is the assembly apparatus for a rotor for an embedded permanent magnet motor according to claim 9, wherein the main surface of the holding jig on the rotor core side is A projection is provided for positioning the permanent magnet in the axial direction in the magnet housing hole when holding the rotor core.

  An assembly device for a rotor for an embedded permanent magnet motor according to claim 11 is the assembly device for a rotor for an embedded permanent magnet motor according to claim 9 or 10, wherein the assembly device is for an inner rotor type embedded permanent magnet motor. The rotor assembly apparatus is characterized in that a recess is formed so as not to form a gap between the permanent magnet and the inner wall on the outer periphery side of the magnet housing hole.

  The rotor assembly apparatus for a permanent magnet embedded motor according to claim 12 is the rotor assembly apparatus for a permanent magnet embedded motor according to claim 9 or 10, wherein the rotor assembly is for an outer rotor type permanent magnet embedded motor. In the rotor assembling apparatus, a concave portion is formed so as not to form a gap between the permanent magnet and the inner wall on the center side of the magnet housing hole.

  In the present invention, the axial direction refers to a direction perpendicular to the end face of the rotor core. The plane direction is a direction parallel to the end face of the rotor core.

  In the rotor for a permanent magnet embedded motor according to claim 1, a recess is formed at a desired position on the end face of the rotor core in the vicinity of the opening of the magnet accommodation hole in a state where the permanent magnet is accommodated in the magnet accommodation hole of the rotor core. Is done. By forming the concave portion, a convex portion is formed on the inner wall of the magnet accommodation hole, and at least a part of the convex portion is pressed against the permanent magnet accommodated in the magnet accommodation hole, and the permanent magnet is fixed. Thus, since the permanent magnet is accommodated in the magnet accommodation hole before forming the convex portion on the inner wall of the magnet accommodation hole, the permanent magnet is not damaged at the time of accommodation, and it is simple only by forming the recess at a desired position on the end surface of the rotor core. In addition, the permanent magnet can be firmly held and fixed in the magnet housing hole. In addition, as a thin steel plate, it is not necessary to use a newly designed thin steel plate in which pin press-fit holes are formed in advance at predetermined locations, and an existing designed thin steel plate can be used. The same applies to the method of assembling the rotor for a permanent magnet embedded motor according to claim 5.

  In the rotor for a permanent magnet embedded motor according to claim 2, the axial end surface of the permanent magnet accommodated in the magnet accommodation hole is located in the magnet accommodation hole, and a part of the convex portion of the inner wall of the magnet accommodation hole is a magnet. It protrudes on the end face of the permanent magnet located in the accommodation hole. Therefore, the movement of the permanent magnet can be suppressed not only in the surface direction but also in the axial direction by the convex portion, and the permanent magnet can be prevented from jumping out of the magnet housing hole without requiring a separate member. The same applies to the method of assembling the rotor for a permanent magnet embedded motor according to claim 6.

  In the rotor for a permanent magnet embedded motor according to claim 3, in the inner rotor type rotor in which the coil is provided on the outer periphery of the rotor core, no gap is formed between the permanent magnet and the outer peripheral side inner wall of the magnet accommodation hole. Therefore, the magnetic resistance in the rotor core does not increase and the passage of magnetic flux is not hindered, and the motor characteristics are not deteriorated. The same applies to the method of assembling the rotor for a permanent magnet embedded motor according to claim 7.

  The rotor for a permanent magnet embedded motor according to claim 4, wherein an air gap is formed between the permanent magnet and the inner wall on the center side of the magnet housing hole in the outer rotor type rotor in which the coil is provided on the inner periphery of the rotor core. As a result, the magnetic resistance in the rotor core does not increase, the passage of magnetic flux is not hindered, and the motor characteristics are not deteriorated. The same applies to the method of assembling the rotor for a permanent magnet embedded motor according to claim 8.

  In the assembly apparatus of the rotor for a permanent magnet embedded motor according to claim 9, the rotor core is sandwiched between a pair of holding jigs, and the permanent magnets are accommodated in the magnet accommodation holes of the rotor core. A concave portion is formed at a desired position on the end face of the rotor core in the vicinity of the opening of the magnet accommodation hole by the punch disposed in the through hole. As a result, the inner wall of the magnet housing hole is plastically deformed to form a convex portion that presses against the permanent magnet. Thus, since the permanent magnet is accommodated in the magnet accommodation hole before forming the convex portion on the inner wall of the magnet accommodation hole, the permanent magnet is not damaged at the time of accommodation, and it is simple only by forming the recess at a desired position on the end surface of the rotor core. In addition, the permanent magnet can be firmly held and fixed in the magnet housing hole. In addition, as a thin steel plate, it is not necessary to use a newly designed thin steel plate in which pin press-fit holes are formed in advance at predetermined locations, and an existing designed thin steel plate can be used.

  In the assembly apparatus of the permanent magnet embedded motor rotor according to claim 10, by providing a protrusion on the main surface of the holding jig, the end surface of the permanent magnet is positioned in the permanent magnet accommodation hole. Be placed. In this case, a part of the convex part formed along with the formation of the concave part can be projected on the end face of the permanent magnet located in the magnet housing hole, and the movement of the permanent magnet is not only in the surface direction by the convex part. A rotor that can be suppressed in the axial direction and in which the permanent magnet does not jump out of the magnet housing hole can be obtained.

  In the rotor assembly apparatus for a permanent magnet embedded motor according to claim 11, a recess is formed in the inner rotor type rotor so as not to form a gap between the permanent magnet and the inner wall on the outer periphery side of the magnet housing hole. Therefore, the magnetic resistance in the rotor core is not increased, the passage of magnetic flux is not hindered, and the motor characteristics are not deteriorated.

  In the assembly apparatus for a rotor for an embedded permanent magnet motor according to claim 12, a recess is formed in the outer rotor type rotor so that no gap is formed between the permanent magnet and the inner wall on the center side of the magnet housing hole. Therefore, the magnetic resistance in the rotor core is not increased, the passage of magnetic flux is not hindered, and the motor characteristics are not deteriorated.

  According to this invention, the permanent magnet is not damaged when the permanent magnet is accommodated in the magnet accommodation hole, and the permanent magnet can be easily firmly fixed in the magnet accommodation hole. In addition, an existing designed thin steel plate can be used as the thin steel plate, and costs can be reduced.

Embodiments of the present invention will be described below with reference to the drawings.
1 to 4, a rotor for a permanent magnet embedded motor (hereinafter simply referred to as “rotor”) 10 according to an embodiment of the present invention is configured as an inner rotor type, and the rotor 10 has a thickness. A rotor core 12 configured by laminating a plurality of thin steel plates 11 having a thickness of about 0.5 mm is included. Each thin steel plate 11 constituting the rotor core 12 has, for example, a half pierce (not shown) having a concave portion on one end face and a convex portion on the other end face at a predetermined position. The thin steel plates 11 are integrated by stacking the concave and convex portions of the half piercings of the adjacent thin steel plates 11 so as to coincide with each other and inserting the convex portions into the concave portions.

The rotor core 12 is provided with a rotary shaft press-fitting hole 14 penetrating in the arrow Z direction (axial direction) from one end surface 12a to the other end surface 12b and a plurality (four in this embodiment) of magnet accommodation holes 16. The rotation shaft press-fitting hole 14 is provided at the center of the rotor core 12, and the magnet housing hole 16 is provided around the rotation shaft press-fitting hole 14. A rotary shaft 18 is press-fitted into the rotary shaft press-fitting hole 14, and a plate-like permanent magnet 20 whose corners are chamfered is accommodated in the linear groove-shaped magnet accommodation hole 16.
The dimension of the magnet housing hole 16 in the arrow Z direction is equal to the dimension of the permanent magnet 20 in the arrow Z direction, and the end faces 12a and 12b of the permanent magnet 20 are flush with each other in the arrow Z direction within the magnet housing hole 16. (See FIG. 4). As the permanent magnet 20, for example, an R—Fe—B rare earth sintered magnet or the like is used.

  As shown in FIG. 2, end plates 22 are respectively disposed on the end surfaces 12 a and 12 b of the rotor core 12, and the rotor core 12 and the two end plates 22 are integrated. The two end plates 22 suppress the movement of the permanent magnet 20 in the magnet housing hole 16 in the direction of the arrow Z, thereby preventing the jumping out.

  The rotor core 12 and the end plate 22 are provided with rivet holes (not shown). The rotor core 12 and the two end plates 22 are inserted with rivets (not shown), and the rotor cores are crushed at both ends of the rivet. 12 and the two end plates 22 are integrated.

  Next, as shown in FIG. 3, a plurality of recesses 24a and 24b are formed in the end surface 12a in the vicinity of one end opening of each magnet accommodation hole 16, and the projections 26a and 26b corresponding to the plurality of recesses 24a and 24b respectively are magnets. Formed on the inner wall of the accommodation hole 16, the convex portions 26 a and 26 b are in pressure contact with the permanent magnet 20. Similarly, a plurality of recesses 24 a and 24 b are formed in the end surface 12 b near the other end opening of the magnet accommodation hole 16, and the projections 26 a and 26 b corresponding to the plurality of recesses 24 a and 24 b are formed on the inner wall of the magnet accommodation hole 16. The protrusions 26 a and 26 b are pressed against the permanent magnet 20. The permanent magnet 20 is held and fixed in the magnet housing hole 16 by the convex portions 26a and 26b.

  Specifically, the concave portion 24a is formed on each of the end faces 12a and 12b in the vicinity of the long side 16a on the center side (inner peripheral side) of the opening portions at both ends of the magnet housing hole 16, and the convex portion 26a is accordingly formed on the long side inner wall ( (Center side inner wall). Moreover, the recessed part 24b is formed in each end surface 12a, 12b in the short side 16b vicinity adjacent to the said long side 16a in which the recessed part 24a is formed, and the convex part 26b is formed in the said short side inner wall according to it.

  Further, as shown in FIGS. 4A and 4B, the recesses 24a and 24b are formed to a depth of about one sheet steel plate 11 by driving a punch or the like, for example. By forming the recesses 24a and 24b, the inner wall of the magnet housing hole 16 is plastically deformed to form the protrusions 26a and 26b.

As shown in FIG. 4A, the convex portion 26a presses the permanent magnet 20 outward (outward) in the direction of the arrow X to bring the permanent magnet 20 into contact with the inner wall on the outer peripheral side of the magnet housing hole 16, thereby The permanent magnet 20 is held and fixed while suppressing the movement of the arrow 20 in the direction of the arrow 20. As shown in FIG. 4B, the convex portion 26b holds the permanent magnet 20 firmly by holding the permanent magnet 20 from both sides in the arrow Y direction and suppressing the movement of the permanent magnet 20 in the arrow Y direction. Fix it.
In this way, the movement of the permanent magnet 20 in the arrow X direction and the Y direction, and hence the movement in the surface direction, is suppressed by the convex portions 26a and 26b.

Next, an assembling apparatus 100 used for assembling the rotor 10 will be described with reference to FIGS.
The assembling apparatus 100 includes a frame 102. The frame 102 includes a gantry 104 disposed above, a gantry 106 disposed below, and a column 108 that connects the gantry 104 and the gantry 106.

An air cylinder 110 is disposed on the gantry 104, and a rod 112 of the air cylinder 110 is inserted into the gantry 104 to face the frame 102, and a piston 114 is provided at the lower end of the rod 112. The air cylinder 110 is driven by a driving means (not shown) to raise or lower the rod 112 and the piston 114 in the arrow Z direction.
A pair of holding jigs 116 for holding or sandwiching the rotor core 12 is disposed in the frame 102. One of the pair of holding jigs 116 is attached to the end face of the piston 114 and configured to be movable up and down within the frame 102, and the other is attached to the main face of the gantry 106 and fixed.

  As shown in FIG. 6, a holding portion 118 for holding the rotor core 12 is provided on the opposing surfaces of the pair of holding jigs 116. The holding portion 118 is provided with a rotating shaft holding hole 120 and a plurality of punch arrangement holes 122 penetrating in the vertical direction. The rotation shaft holding hole 120 is formed at the center of the holding portion 118. The punch arrangement hole 122 includes a large-diameter portion 122a, a small-diameter portion 122b, and a step portion 122c that serves as a stopper for the punch 126 (described later), and the small-diameter portion 122b is in the vicinity of the opening of the magnet housing hole 16 of the rotor core 12. The punch arrangement hole 122 is formed so as to be located at the position.

  Referring also to FIG. 3, specifically, for one end opening of each magnet housing hole 16, two small diameter portions 122 b correspond to the vicinity of the long side 16 a on the center side, and further, the long side 16 a A total of four punch arrangement holes 122 are formed in the holding jig 116 so that one small diameter portion 122b corresponds to each of the two adjacent short sides 16b. Similarly, in the other end opening of each magnet housing hole 16, two small-diameter portions 122b correspond to the vicinity of the long side 16a on the center side, and further, the vicinity of the two short sides 16b adjacent to the long side 16a. A total of four punch arrangement holes 122 are formed in the holding jig 116 so that the small-diameter portions 122b correspond to each one. Therefore, in this embodiment, a total of 16 punch arrangement holes 122 are formed in each holding jig 116. A punch 126 having a tip formed in a conical shape is inserted into each punch arrangement hole 122 via a spring 124. The punch 126 is positioned in the surface direction by guiding the inner peripheral surface of the large-diameter portion 122a, and the axial movable range is defined by the step portion 122c.

  Further, each of the gantry 106 and the piston 114 is provided with a through hole 128 at a position corresponding to the punch placement hole 122. Therefore, the positions and the number of the punch arrangement holes 122 of the holding jig 116 and the through holes 128 of the gantry 106 and the piston 114 are the same. An air cylinder 130 is disposed in each through-hole 128, and the air cylinder 130 is simultaneously driven by one driving means (not shown) to raise or lower the rod 132 and the piston 134. During the punching operation, by driving the air cylinder 130, the piston 134 enters the punch placement hole 122 and pushes the rear end surface of the punch 126, whereby the front end portion of the punch 126 projects from the punch placement hole 122, and the rotor core 12. Concave portions 24a and 24b are formed on the end surfaces of the two.

Next, the main operation of the assembling apparatus 100 will be described with reference to FIG.
As shown in FIG. 8A, first, the rotor core 12 is placed on the holding portion 118 of the holding jig 116 attached to the gantry 106 and the permanent magnet 20 is housed in the magnet housing hole 16 by hand.
The rotor core 12 and the holding jig 116 may be provided with marks (not shown) so that the magnet housing hole 16 and the small diameter portion 122b of the punch placement hole 122 are in an appropriate positional relationship.

  Next, as shown in FIG. 8B, when a start button (not shown) is pressed, the air cylinder 110 is driven and the holding jig 116 attached to the piston 114 is lowered, and the pair of holding jigs 116 The rotor core 12 is clamped.

  Then, as shown in FIG. 8C, by pushing a driving button (not shown), the air cylinder 130 provided in the through hole 128 of the gantry 106 and the piston 114 is driven, and the piston 134 is moved into the punch placement hole 122. storm in. The rear end surface of the punch 126 is pressed by the piston 134, whereby the front end portion of the punch 126 protrudes from the punch placement hole 122, and is driven into each of the end surfaces 12a and 12b of the rotor core 12 at a depth of about one sheet steel plate. Recesses (driving marks) 24a, 24b are formed. By forming the recesses 24a and 24b on the end faces 12a and 12b, the inner wall of the magnet housing hole 16 is plastically deformed to form the projections 26a and 26b, and the projections 26a and 26b are pressed against the permanent magnet 20 and become permanent. The magnet 20 is fixed in the magnet housing hole 16.

Thereafter, the holding jig 116 attached to the piston 114 is raised by driving the air cylinder 110.
The holding jig 116 may be raised automatically after the punch 138 has been driven, or by pressing an end button (not shown).

  According to the rotor 10 obtained in this manner, the desired end surfaces 12a and 122b of the rotor core 12 in the vicinity of the opening portions at both ends of the magnet accommodation hole 16 in a state where the permanent magnet 20 is accommodated in the magnet accommodation hole 16 of the rotor core 12. Concave portions 24a and 24b are formed at the positions. Protrusions 26 a and 26 b are formed on the inner wall of the magnet housing hole 16 by forming the recesses 24 a and 24 b, and at least a part of the projecting parts 26 a and 26 b is in pressure contact with the permanent magnet 20 housed in the magnet housing hole 16. Is fixed.

  Thus, since the permanent magnet 20 is accommodated in the magnet accommodation hole 16 before forming the convex portions 26a and 26b on the inner wall of the magnet accommodation hole 16, the permanent magnet 20 is not damaged at the time of accommodation, and R-Fe is used as the permanent magnet 20. Even when a -B rare earth sintered magnet is used, the magnetic properties do not deteriorate.

Further, the convex portions 26a and 26b that press against the permanent magnet 20 can be formed simply by forming the concave portions 24a and 24b with the punch 122 at the desired positions of the end faces 12a and 12b of the rotor core 12, and the permanent magnet 20 can be easily formed. It can be firmly held and fixed in the magnet housing hole 16.
As the thin steel plate 11, it is not necessary to use a newly designed thin steel plate in which a pin press-fit hole is formed in advance at a predetermined location, and an existing designed thin steel plate can be used, thereby reducing the cost.

  Furthermore, in Patent Document 2, since the position (fixed portion) of the caulking portion that presses against the permanent magnet is uniquely determined according to the position of the pin press-fitting hole in the rotor core, the position of the caulking portion is changed unless the thin steel plate is changed. However, according to the present invention, the positions of the concave portion and the convex portion can be easily changed in the rotor core 12 without changing the thin steel plate.

  Further, since simple processing is performed in the vicinity of the opening of the magnet accommodation hole 16 of the rotor core 12, the passage of magnetic flux in the rotor core is prevented as in the case where a hole for press-fitting a pin or the like is newly provided in the rotor core. There is no need to review the design. Therefore, the present invention can be applied to an existing inner rotor type rotor, and a recess can be easily formed.

  Further, since the permanent magnet 20 and the inner wall on the outer periphery side of the magnet housing hole 16 are brought into contact with each other by the convex portion 26a and no gap is formed therebetween, in the inner rotor type motor, the magnetic resistance in the rotor core 12 is not increased and the magnetic flux is not generated. The passage is not hindered and the motor characteristics are not deteriorated.

  Furthermore, since the corner portion of the permanent magnet 20 is R-chamfered, the convex portions 26a and 26b are slightly applied to the chamfered portion, which can contribute to the suppression of the axial movement of the permanent magnet 20.

  The depth of the recesses 24a and 24b is not particularly limited, and may be equal to or less than one thin steel plate.

  In the rotor 10, the positions of the recesses 24 a and 24 b may be arbitrary on the end face of the rotor core 12 as long as no gap is formed between the permanent magnet 20 and the inner wall on the outer periphery side of the magnet housing hole 16.

Next, a rotor 200 according to another embodiment of the present invention will be described with reference to FIGS.
The rotor 200 is used in an inner rotor type permanent magnet embedded motor similar to the above-described rotor 10 and is configured in substantially the same manner as the above-described rotor 10, and thus description of overlapping portions is omitted.

  As shown in FIGS. 11A and 11B, the permanent magnet 202 used in the rotor 200 has a length in the arrow Z direction that is two sheet steel plates longer than the dimension of the magnet housing hole 16 in the arrow Z direction. The end faces of the permanent magnet 202 are set so as to be shorter than the end faces 12a and 12b of the rotor core 12 by one sheet steel plate. A plurality of recesses 204a and 204b are formed in each of the end faces 12a and 12b of the rotor core 12 to a depth of about two thin steel plates by punching, for example.

  As shown in FIGS. 9 and 10, a plurality of recesses 204 a and 204 b are formed in the end surface 12 a in the vicinity of one end opening of each magnet housing hole 16, and thereby the plurality of recesses are formed by plastic deformation of the inner wall of the magnet housing hole 16. Convex portions 206 a and 206 b corresponding to 204 a and 204 b are formed, and the convex portions 206 a and 206 b are pressed against the permanent magnet 202. Similarly, a plurality of recesses 204 a and 204 b are formed in the end surface 12 b near the other end opening of the magnet accommodation hole 16, and projections 206 a and 206 b corresponding to the plurality of recesses 204 a and 204 b are formed on the inner wall of the magnet accommodation hole 16. The protrusions 206 a and 206 b are pressed against the permanent magnet 202. The permanent magnet 202 is held and fixed in the magnet housing hole 16 by such convex portions 206a and 206b.

  Specifically, the concave portion 204a is formed on each of the end surfaces 12a and 12b in the vicinity of the long side 16a on the center side of the opening portions at both ends of the magnet accommodation hole 16, and the convex portion 206a is accordingly formed on the inner wall of the long side. Moreover, the recessed part 204b is formed in each end surface 12a, 12b in the short side 16b vicinity adjacent to the said long side 16a in which the recessed part 204a is formed, and the convex part 206b is formed in the said short side inner wall according to it.

  Further, as shown in FIG. 11A, the convex portion 206a includes a press-contact portion 206a1 that press-contacts the permanent magnet 202 from the side surface direction and a protruding portion 206a2 that protrudes on the end surface of the permanent magnet 202 in the arrow Z direction. The The pressure contact portion 206a1 is in pressure contact with the permanent magnet 202 and suppresses the movement of the permanent magnet 202 in the arrow X direction, and the protrusion 206a2 sandwiches the permanent magnet 202 and suppresses the movement of the permanent magnet 202 in the arrow Z direction.

  Further, as shown in FIG. 11B, the convex portion 206b includes a press-contact portion 206b1 that press-contacts the permanent magnet 202 from the side surface and a protrusion 206b2 that protrudes on the end surface of the permanent magnet 202 in the arrow Z direction. The The pressure contact portion 206b1 is in pressure contact with the permanent magnet 202 and suppresses the movement of the permanent magnet 202 in the arrow Y direction, and the protrusion 206b2 sandwiches the permanent magnet 202 and suppresses the movement of the permanent magnet 202 in the arrow Z direction.

  According to such a rotor 200, the movement of the permanent magnet 202 in the arrow X direction, the Y direction, and the Z direction is suppressed by the convex portions 206a and 206b, and the movement of the permanent magnet 20 is not only in the surface direction but also in the axial direction. Therefore, the permanent magnet 202 can be prevented from jumping out of the magnet housing hole 16. As a result, as shown in FIG. 9, the rotor 200 does not require a member for preventing the permanent magnet 202 from jumping out such as an end plate.

  If the permanent magnet 202 is arranged so that both end faces of the permanent magnet 202 are more than one sheet steel plate in the axial direction than the end faces 12a and 12b of the rotor core 12, respectively, the movement of the permanent magnet 202 in the axial direction is increased. Although it is desirable because it can be more reliably suppressed, the present invention is not limited to this, and the permanent magnet 202 may be arranged so that at least one end surface of the permanent magnet 202 is inward in the axial direction from the corresponding end surface of the rotor core 12. .

  Further, the depths of the concave portions 204a and 204b may be arbitrary as long as the press contact portions and the protruding portions can be formed on the convex portions 206a and 206b. For example, even if the length of the permanent magnet 202 in the arrow Z direction is one sheet steel plate shorter than the dimension of the magnet housing hole 16 in the arrow Z direction, and the depth of the recesses 204a and 204b is one sheet steel plate, It suffices that the protruding portions of the convex portions 206a and 206b can slightly protrude on the end surface of the permanent magnet 202 in the arrow Z direction.

  Furthermore, depending on the attitude of the rotor 200 during motor operation, the protrusions 206a and 206b having protrusions may be provided only on either one of both end faces in the arrow Z direction of the permanent magnet 202.

Next, the assembly device 100a of the rotor 200 will be described with reference to FIGS.
In the assembling apparatus 100a, a holding jig 116a is used instead of the holding jig 116 in the above-described assembling apparatus 100. Other configurations are the same as those of the assembling apparatus 100, and thus redundant description thereof is omitted.

  In the pair of holding jigs 116a used in the assembling apparatus 100a, as shown by a broken line in FIG. 7, a plurality (four in this embodiment) of protrusions 136 are provided on the bottom surface of the holding part 118. The protrusion 136 is formed in a thickness corresponding to one thin steel plate at a position corresponding to the opening of the magnet accommodation hole 16 of the rotor core 12.

  As shown in FIG. 12, when the rotor core 12 is sandwiched between the pair of holding jigs 116 a, the protrusion 136 enters the magnet accommodation hole 16. The protrusion 136 positions the permanent magnet 202 so that both end faces in the arrow Z direction of the permanent magnet 202 are positioned in the magnet housing hole 16 at a depth one sheet steel plate deeper than the end faces 12a, 12b of the rotor core 12. . Further, when the protrusion 136 enters the magnet accommodation hole 16 so that the protrusion 206a2 of the protrusion 206a and the protrusion 206b2 of the protrusion 206b can be formed on the inner wall of the magnet accommodation hole 16, the inner wall of the magnet accommodation hole 16 is formed. Among them, a gap is formed between the convex portion forming surface (the inner wall of the long side 16a and the inner wall of the short side 16b: see FIG. 10) and the side surface of the protrusion 136.

  Then, by driving the air cylinder 130 and causing the piston 134 to enter the punch placement hole 122, the punch 126 is driven into each of the end faces 12a and 12b to a depth of about two thin steel plates to form the recesses 204a and 204b. Thus, a convex portion 206a having a pressure contact portion 206a1 and a protruding portion 206a2 and a convex portion 206b having a pressure contact portion 206b1 and a protruding portion 206b2 are formed on the inner wall of the magnet housing hole 16. In order to fix the permanent magnet 202 without distortion, it is desirable that the upper and lower punches 126 are simultaneously pressed.

  According to such an assembling apparatus 100a, the concave portions 204a and 204b are formed and the convex portions 206a and 206b are formed only by driving the punch 126 into the end faces 12a and 12b of the rotor core 12 to a depth of about two thin steel plates. The permanent magnet 202 can be more firmly held at a desired position in the magnet housing hole 16 by a simple operation.

  Further, since the protrusion 136 functions not only as an axial positioning member for the permanent magnet 202 but also as a positioning member for the magnet accommodation hole 16 and the punch placement hole 122, a desired position near the opening of the magnet accommodation hole 16. In addition, the recesses 204a and 204b can be accurately formed, variation in the fixing position of the permanent magnet 202 in the magnet housing hole 16 can be suppressed, and deterioration of motor characteristics can be prevented.

Further, referring to FIGS. 13 to 16, a rotor 300 according to another embodiment of the present invention is used in an outer rotor type embedded permanent magnet motor. The description of the same configuration as the rotor 10 used in the above-described inner rotor type embedded permanent magnet motor is omitted.
The rotor 300 includes a rotor core 302 formed by laminating a plurality of thin steel plates 301 having an annular shape and a thickness of about 0.5 mm.

The rotor core 302 is provided with a plurality (ten in this embodiment) of magnet accommodation holes 304 that penetrate the end faces 302a and 302b in the direction of the arrow Z. A plate-like permanent magnet 306 having a corner chamfered in a corner is accommodated in the linear groove-shaped magnet accommodation hole 304.
The dimension of the magnet housing hole 304 in the arrow Z direction is equal to the length of the permanent magnet 306 in the arrow Z direction, and both end surfaces of the permanent magnet 306 and the end surfaces 302a and 302b are flush with each other in the magnet housing hole 304. (See FIG. 16).

  An end plate 308 is disposed on the end surface 302a, and a rotating shaft holding plate 310 having a through hole at the center is disposed on the end surface 302b. The rotary shaft 312 is press-fitted into the through hole of the rotary shaft holding plate 310.

  As shown in FIG. 14, the rotor core 302, the end plate 308, and the rotating shaft holding plate 310 are integrated. By the end plate 308 and the rotating shaft holding plate 310, the permanent magnet 306 in the magnet accommodation hole 304 is restrained from moving in the arrow Z direction, and is prevented from popping out.

  Next, as shown in FIG. 15, a plurality of recesses 314a and 314b are formed on the end surface 302a in the vicinity of one end opening of each magnet accommodation hole 304, and the projections 316a and 316b corresponding to the plurality of recesses 314a and 314b respectively are magnets. Formed on the inner wall of the accommodation hole 304, the convex portions 316 a and 316 b are in pressure contact with the permanent magnet 306. Similarly, a plurality of recesses 314a and 314b are formed in the end surface 302b near the other end opening of the magnet accommodation hole 304, and the projections 316a and 316b corresponding to the plurality of recesses 314a and 314b are formed on the inner wall of the magnet accommodation hole 304, respectively. The protrusions 316 a and 316 b are pressed against the permanent magnet 306. The permanent magnet 306 is held and fixed in the magnet housing hole 304 by such convex portions 316a and 316b.

  Specifically, the concave portion 314a is formed on each of the end surfaces 302a and 302b in the vicinity of the long side 304a on the outer peripheral side of both end openings of the magnet accommodation hole 304, and the convex portion 316a is accordingly formed on the long side inner wall (outer peripheral inner wall) It is formed. The concave portion 314b is formed on each of the end surfaces 302a and 302b in the vicinity of the short side 304b adjacent to the long side 304a where the concave portion 314a is formed, and the convex portion 316b is formed on the inner wall of the short side accordingly.

  Further, as shown in FIGS. 16A and 16B, the recesses 314a and 314b are formed to a depth of about one sheet steel sheet 11 by driving a punch or the like, for example. By forming the recesses 314a and 314b, the inner wall of the magnet housing hole 304 is plastically deformed to form the protrusions 316a and 316b.

As shown in FIG. 16A, the convex portion 316a presses the permanent magnet 306 inward (inward) in the direction of the arrow X to bring the permanent magnet 306 into contact with the inner wall on the inner peripheral side of the magnet housing hole 304, thereby permanently The permanent magnet 306 is held and fixed while suppressing the movement of the magnet 306 in the arrow X direction. Further, as shown in FIG. 16B, the convex portion 316b holds the permanent magnet 306 firmly by holding the permanent magnet 306 from both sides in the arrow Y direction and suppressing the movement of the permanent magnet 306 in the arrow Y direction. Fix it.
In this manner, the movement of the permanent magnet 306 in the arrow X direction and the Y direction, and hence the movement in the surface direction, is suppressed by the convex portions 316a and 316b.

Next, an assembly apparatus 400 used for assembling the rotor 300 will be described with reference to FIGS. 17 to 19.
The assembly apparatus 400 includes a frame 402. The frame 402 includes a gantry 404 disposed above, a gantry 406 disposed below, and a column 408 connecting the gantry 404 and the gantry 406.

An air cylinder 410 is disposed on the gantry 404, and a rod 412 of the air cylinder 410 is inserted into the gantry 404 to face the frame 402, and a piston 414 is provided at the lower end of the rod 412. The air cylinder 410 is driven by driving means (not shown) to raise or lower the rod 412 and the piston 414 in the arrow Z direction.
A pair of holding jigs 416 for holding or sandwiching the rotor core 302 is disposed in the frame 402. One of the pair of holding jigs 416 is attached to the end surface of the piston 414 and configured to be movable up and down within the frame 402, and the other is attached to the main surface of the gantry 406 and fixed.

  As shown in FIG. 18, a holding portion 418 for holding the rotor core 302 is provided on the opposing surfaces of the pair of holding jigs 416. The holding part 418 is provided with a plurality of punch arrangement holes 420. The punch arrangement hole 420 includes a large-diameter portion 420a, a small-diameter portion 420b, and a step portion 420c that serves as a stopper for the punch 424 (described later), and the small-diameter portion 420b is near the opening of the magnet housing hole 304 of the rotor core 302. The punch arrangement hole 420 is formed so as to be located at the position.

  Referring to FIG. 15 as well, specifically, with respect to one end opening of each magnet housing hole 304, two small-diameter portions 420b correspond to the vicinity of the long side 304a on the outer peripheral side, and further, the long side 304a corresponds to the long side 304a. A total of four punch arrangement holes 420 are formed in the holding jig 416 so that one small diameter portion 420b corresponds to each of the two adjacent short sides 304b. Similarly, in the other end opening of each magnet housing hole 304, two small-diameter portions 420b correspond to the vicinity of the long side 304a on the outer peripheral side, and further, the vicinity of the two short sides 304b adjacent to the long side 304a. A total of four punch arrangement holes 420 are formed in the holding jig 416 so that one small diameter portion 420b corresponds to each. Therefore, in this embodiment, a total of 40 punch arrangement holes 420 are formed in each holding jig 416. A punch 424 whose tip is formed in a conical shape is inserted into each punch arrangement hole 420 via a spring 422. The punch 424 is positioned in the surface direction by guiding the inner peripheral surface of the large diameter portion 420a, and the movable range in the axial direction is defined by the step portion 420c.

  Further, each of the gantry 406 and the piston 414 is provided with a through hole 426 at a position corresponding to the punch arrangement hole 420. Therefore, the positions and the number of the punch arrangement holes 420 of the holding jig 416 and the through holes 426 of the mount 406 and the piston 414 coincide with each other. An air cylinder 428 is disposed in each through-hole 426, and the air cylinder 428 is simultaneously driven by one driving means (not shown) to raise or lower the rod 430 and the piston 432. During the punching operation, the air cylinder 428 is driven to cause the piston 432 to enter the punch placement hole 420 and press the rear end face of the punch 424, whereby the front end of the punch 424 protrudes from the punch placement hole 420, and the rotor core 302. Concave portions 314a and 314b are formed on the end surfaces of the first and second portions.

Next, the main operation of the assembling apparatus 400 will be described with reference to FIG.
As shown in FIG. 20A, first, the rotor core 302 is placed in the holding portion 418 of the holding jig 416 attached to the gantry 406 and the permanent magnet 306 is housed in the magnet housing hole 304 by hand.
The rotor core 302 and the holding jig 416 may be provided with a mark (not shown) so that the magnet housing hole 304 and the small diameter portion 420b of the punch placement hole 420 are in an appropriate positional relationship.

  Next, as shown in FIG. 20B, when a start button (not shown) is pressed, the air cylinder 410 is driven and the holding jig 416 attached to the piston 414 is lowered, and the pair of holding jigs 416 The rotor core 302 is clamped.

  Then, as shown in FIG. 20 (c), by pushing a driving button (not shown), the air cylinder 428 provided in the through hole 426 of the mount 406 and the piston 414 is driven, and the piston 432 is moved into the punch placement hole 420. storm in. The rear end surface of the punch 424 is pressed by the piston 432, whereby the front end portion of the punch 424 protrudes from the punch placement hole 420 and is driven into each of the end surfaces 302 a and 302 b of the rotor core 302 at a depth of about one sheet steel plate. Recesses 314a and 314b are formed. By forming the recesses 314a and 314b on the end surfaces 302a and 302b, the inner wall of the magnet housing hole 304 is plastically deformed to form the projections 316a and 316b, and the projections 316a and 316b are pressed against the permanent magnet 306 to be permanent. The magnet 306 is fixed in the magnet accommodation hole 304.

Thereafter, the holding cylinder 416 attached to the piston 414 is raised by driving the air cylinder 410.
The holding jig 416 may be lifted automatically after the punch 424 has been driven, or may be performed by pressing an end button (not shown).

  According to the rotor 300 obtained in this manner, the desired end surfaces 302a and 302b of the rotor core 302 in the vicinity of the openings at both ends of the magnet accommodation hole 304 in a state where the permanent magnet 306 is accommodated in the magnet accommodation hole 304 of the rotor core 302. Concave portions 314a and 314b are formed at the positions. Protrusions 316a and 316b are formed on the inner wall of the magnet accommodation hole 304 by forming the recesses 314a and 314b, and at least a part of the projections 316a and 316b is in pressure contact with the permanent magnet 306 accommodated in the magnet accommodation hole 304. Is fixed.

  As described above, the permanent magnet 306 is accommodated in the magnet accommodation hole 304 before the convex portions 316a and 316b are formed on the inner wall of the magnet accommodation hole 304. Therefore, the permanent magnet 306 is not damaged at the time of accommodation, and R-Fe is used as the permanent magnet 306. Even when a -B rare earth sintered magnet is used, the magnetic properties do not deteriorate.

Further, the convex portions 316a and 316b that press against the permanent magnet 306 can be formed simply by forming the concave portions 314a and 314b with the punch 424 at desired positions on the end faces 302a and 302b of the rotor core 302. It can be firmly held and fixed in the magnet housing hole 304.
As the thin steel plate 301, it is not necessary to use a newly designed thin steel plate in which a pin press-fit hole is formed in advance at a predetermined location, and an existing designed thin steel plate can be used, thereby reducing costs.

Furthermore, the positions of the concave and convex portions in the rotor core 302 can be easily changed.
Further, since simple machining is performed in the vicinity of the opening of the magnet accommodation hole 304 of the rotor core 302, the passage of magnetic flux in the rotor core is prevented as in the case where a hole for press-fitting a pin or the like is newly provided in the rotor core. There is no need to review the design. Therefore, the present invention can be applied to an existing outer rotor type rotor, and the recess can be easily formed.

  Further, since the permanent magnet 306 and the central inner wall of the magnet housing hole 304 are brought into contact with each other by the convex portion 316a and no gap is formed therebetween, in the outer rotor type motor, the magnetic resistance in the rotor core 302 is not increased and the magnetic flux The passage is not hindered and the motor characteristics are not deteriorated.

  Further, since the corner portion of the permanent magnet 306 is R chamfered, the convex portions 316a and 316b are applied to the chamfered portion to some extent, which can contribute to the suppression of the axial movement of the permanent magnet 306.

  The depth of the recesses 314a and 314b is not particularly limited, and may be equal to or less than one sheet steel plate.

  In the rotor 300, the positions of the recesses 314 a and 314 b may be arbitrary on the end face of the rotor core 302 as long as no gap is formed between the permanent magnet 306 and the inner wall on the center side of the magnet housing hole 304.

Next, a rotor 500 according to another embodiment of the present invention will be described with reference to FIGS.
The rotor 500 is used in an outer rotor type permanent magnet embedded motor, similar to the above-described rotor 300, and is configured in substantially the same manner as the above-described rotor 300, and thus description of overlapping portions is omitted.

  As shown in FIGS. 23A and 23B, the permanent magnet 502 used in the rotor 500 has a length in the arrow Z direction that is two sheet steel plates longer than the dimension of the magnet housing hole 304 in the arrow Z direction. The end faces of the permanent magnet 502 are set so as to be shorter than the end faces 302a and 302b of the rotor core 302 by one sheet steel plate. Concave portions 504a and 504b are formed in the end faces 302a and 302b of the rotor core 302 by a punch or the like, for example, to a depth of about two thin steel plates.

  As shown in FIGS. 21 and 22, a plurality of recesses 504 a and 504 b are formed in the end surface 302 a in the vicinity of one end opening of each magnet accommodation hole 304, and thereby the plurality of recesses are caused by plastic deformation of the inner wall of the magnet accommodation hole 304. Convex portions 506 a and 506 b corresponding to 504 a and 504 b are formed, and the convex portions 506 a and 506 b are pressed against the permanent magnet 502. Similarly, a plurality of recesses 504a and 504b are formed in the end surface 302b near the other end opening of the magnet accommodation hole 304, and the projections 506a and 506b corresponding to the plurality of recesses 504a and 504b are formed on the inner wall of the magnet accommodation hole 304, respectively. The protrusions 506 a and 506 b are pressed against the permanent magnet 502. The permanent magnet 502 is held and fixed in the magnet accommodation hole 304 by such convex portions 506a and 506b.

  Specifically, the concave portion 504a is formed on each of the end surfaces 302a and 302b in the vicinity of the long side 304a on the outer peripheral side of the opening portions at both ends of the magnet accommodation hole 304, and the convex portion 506a is accordingly formed on the inner wall of the long side. The concave portion 504b is formed on each of the end surfaces 302a and 302b in the vicinity of the short side 304b adjacent to the long side 304a where the concave portion 504a is formed, and the convex portion 506b is formed on the inner wall of the short side accordingly.

  Furthermore, as shown in FIG. 23A, the convex portion 506a is composed of a pressure contact portion 506a1 that presses against the permanent magnet 502 from the side surface direction and a protrusion portion 506a2 that protrudes on the end surface of the permanent magnet 502 in the arrow Z direction. The The pressure contact portion 506a1 is in pressure contact with the permanent magnet 502 to suppress the movement of the permanent magnet 502 in the arrow X direction, and the protrusion 506a2 sandwiches the permanent magnet 502 and suppresses the movement of the permanent magnet 502 in the arrow Z direction.

  Further, as shown in FIG. 23B, the convex portion 506b is composed of a pressure contact portion 506b1 that presses against the permanent magnet 502 from the side surface direction and a protrusion 506b2 that protrudes on the end surface of the permanent magnet 502 in the arrow Z direction. The The pressure contact portion 506b1 presses against the permanent magnet 502 and suppresses the movement of the permanent magnet 502 in the arrow Y direction, and the protrusion 506b2 sandwiches the permanent magnet 502 and suppresses the movement of the permanent magnet 502 in the arrow Z direction.

  According to such a rotor 500, the protrusions 506a and 506b suppress the movement of the permanent magnet 502 in the directions of the arrows X, Y, and Z, so that the movement of the permanent magnet 502 is not only in the plane direction but also in the axial direction. Therefore, the permanent magnet 502 can be prevented from jumping out of the magnet housing hole 304. As a result, as shown in FIG. 21, the rotor 500 does not require a member for preventing the permanent magnet 502 from jumping out such as an end plate.

  If the permanent magnets 502 are arranged so that both end surfaces of the permanent magnets 502 are more than one sheet steel plate in the axial direction than the end surfaces 302a and 302b of the rotor core 302, the movement of the permanent magnets 502 in the axial direction is further increased. Although it is desirable because it can be reliably suppressed, the present invention is not limited to this, and the permanent magnet 502 may be arranged such that at least one end surface of the permanent magnet 502 is inward in the axial direction from the corresponding end surface of the rotor core 302.

  Further, the depth of the concave portions 504a and 504b may be arbitrary as long as the press contact portion and the protruding portion can be formed on the convex portions 506a and 506b. For example, the length of the permanent magnet 502 in the arrow Z direction is one sheet steel plate shorter than the dimension of the magnet housing hole 304 in the arrow Z direction, and the depths of the recesses 504a and 504b are one sheet steel plate or less. However, it suffices that the protruding portions of the convex portions 506a and 506b can protrude somewhat on the end face in the arrow Z direction of the permanent magnet 502.

  In addition, since the rotating shaft holding plate 310 is attached to the end surface 302b, the convex portions 506a and 506b having protruding portions may be provided only on the end surface 302a side.

Next, an assembly device 400a for the rotor 500 will be described with reference to FIGS.
In the assembling apparatus 400a, a holding jig 416a is used instead of the holding jig 416 in the above-described assembling apparatus 400. Since the other configuration is the same as that of the assembly apparatus 400, the overlapping description is omitted.

  In the pair of holding jigs 416a used in the assembling apparatus 400a, as shown by broken lines in FIG. 19, a plurality (ten in this embodiment) of protrusions 434 are provided on the bottom surface of the holding part 418. The protrusion 434 is formed at a thickness corresponding to one opening of the thin steel plate at a position corresponding to the opening of the magnet accommodation hole 304 of the rotor core 302.

  As shown in FIG. 24, when the rotor core 302 is clamped by a pair of holding jigs 416a, the protrusion 434 enters the magnet accommodation hole 304. The protrusions 434 position the permanent magnet 502 so that both end faces in the arrow Z direction of the permanent magnet 502 are positioned in the magnet housing hole 304 at a depth of one thin steel plate than the end faces 302a and 302b of the rotor core 302. . In addition, when the projection 434 enters the magnet accommodation hole 304 so that the projection 506a2 of the projection 506a and the projection 506b2 of the projection 506b can be formed on the inner wall of the magnet accommodation hole 304, the inner wall of the magnet accommodation hole 304 is formed. Among them, a gap is formed between the convex portion forming surface (the inner wall of the long side 304a and the inner wall of the short side 304b: see FIG. 22) and the side surface of the protruding portion 434.

  Then, by driving the air cylinder 428 and causing the piston 432 to enter the punch placement hole 420, the punches 424 are driven into the end faces 302a and 302b to a depth of about two sheet steel plates to form the recesses 504a and 504b. Thus, a convex portion 506a having a pressure contact portion 506a1 and a projection portion 506a2 and a convex portion 506b having a pressure contact portion 506b1 and a projection portion 506b2 are formed on the inner wall of the magnet housing hole 304. In order to fix the permanent magnet 502 without distortion, it is desirable that the upper and lower punches 424 are simultaneously pressed.

  According to such an assembling apparatus 400a, the concave portions 504a and 504b are formed by merely driving the punch 424 into the end faces 302a and 302b of the rotor core 302 to a depth of about two thin steel plates, and the convex portions 506a and 506b are formed. The permanent magnet 502 can be more firmly held at a desired position in the magnet housing hole 304 by a simple operation.

  Further, since the projection 434 functions not only as an axial positioning member for the permanent magnet 502 but also as a positioning member for the magnet accommodation hole 304 and the punch placement hole 420, a desired position near the opening of the magnet accommodation hole 304 is desired. In addition, the concave portions 504a and 504b can be accurately formed, variation in the fixing position of the permanent magnet 502 in the magnet housing hole 304 can be suppressed, and deterioration of the motor characteristics can be prevented.

  In the present invention, the shape of the permanent magnet and the shape of the magnet housing hole are not particularly limited, and may be, for example, an arc plate shape, a column shape, a polygonal column shape, or the like, but it is desirable that the shapes correspond to each other.

  Further, the number of magnet accommodation holes provided in the rotor core and the number of permanent magnets accommodated therein are not particularly limited.

  Further, the number of concave portions formed on the end face of the rotor core is not particularly limited as long as the permanent magnets can be securely fixed by the convex portions. However, with respect to one magnet housing hole so that the convex portions are pressed against the permanent magnets from a plurality of directions. It is desirable to form a plurality of recesses.

  Furthermore, in the above-mentioned embodiment, although the recessed part was formed in the both end surfaces of a rotor core, a recessed part may be formed only in at least any one end surface of a rotor core.

  Further, in the punch used in the assembling apparatus of the present invention, the shape of the tip portion is not limited to the conical shape (see FIG. 25A), and may be arbitrary as long as the concave portion can be reliably formed on the end surface of the rotor core. For example, as shown in FIG. 25B, the tip of the punch may have a substantially wedge shape (minus shape). By making the tip portion substantially wedge-shaped, the convex portion can be formed larger, and the permanent magnet can be more firmly fixed. Further, as shown in FIG. 25C, the tip of the punch may be a pyramid shape.

  Further, the concave portion may be formed manually using a punch or the like.

  Further, when the rotor of the present invention is discarded, for example, the permanent magnet can be easily removed from the magnet housing hole by plastically deforming the convex portion using a punch or the like so as to release the pressure contact of the convex portion with the permanent magnet. Can be taken out.

It is a disassembled perspective view which shows one Embodiment of this invention. It is a perspective view showing one embodiment of this invention. It is a top view which shows the one end surface of the rotor core of embodiment of FIG. (A) is AA sectional drawing which shows the positional relationship between a recessed part and a convex part, and the fixing aspect of a permanent magnet, (b) is B- which shows the positional relationship between a recessed part and a convex part, and the fixed aspect of a permanent magnet. It is B sectional drawing. It is a front view of the assembly apparatus used in order to assemble a rotor. It is a partial cross section solution figure of the assembly apparatus used in order to assemble a rotor. It is a disassembled perspective view which shows the positional relationship of a holding jig and a rotor core. It is an illustration figure which shows operation | movement of an assembly apparatus. It is a perspective view which shows other embodiment of this invention. It is a top view which shows the one end surface of the rotor core of embodiment of FIG. (A) is AA sectional drawing which shows the positional relationship between a recessed part, a press-contact part, and a protrusion part, and the fixed aspect of a permanent magnet, (b) is the positional relationship between a recessed part, a press-contact part, and a protrusion part, and a permanent magnet It is BB sectional drawing which shows a fixed aspect. It is a partial cross section solution figure of the assembly apparatus used in order to assemble a rotor. It is a disassembled perspective view which shows other embodiment of this invention. It is a perspective view which shows other embodiment of this invention. It is a top view which shows the one end surface of the rotor core of embodiment shown in FIG. (A) is AA sectional drawing which shows the positional relationship between a recessed part and a convex part, and the fixing aspect of a permanent magnet, (b) is B- which shows the positional relationship between a recessed part and a convex part, and the fixed aspect of a permanent magnet. It is B sectional drawing. It is a front view of the assembly apparatus used in order to assemble a rotor. It is a partial cross section solution figure of the assembly apparatus used in order to assemble a rotor. It is a disassembled perspective view which shows the positional relationship of a holding jig and a rotor core. It is an illustration figure which shows operation | movement of an assembly apparatus. It is a perspective view which shows other embodiment of this invention. It is a top view which shows the one end surface of the rotor core of embodiment of FIG. (A) is AA sectional drawing which shows the positional relationship of a recessed part, a press-contact part, and a protrusion part, and the fixed aspect of a permanent magnet, (b) is the positional relationship of a recessed part, a press-contact part, and a protrusion part, and a permanent magnet It is BB sectional drawing which shows a fixed aspect. It is a partial cross section solution figure of the assembly apparatus used in order to assemble a rotor. It is an illustration figure which shows the modification of a punch. It is a top view which shows the rotor of a prior art.

Explanation of symbols

10, 200, 300, 500 Rotor 11, 301 Thin steel plate 12, 302 Rotor core 12a, 12b, 302a, 302b End face of rotor core 16, 304 Magnet receiving hole 20, 202, 306, 502 Permanent magnet 24a, 24b, 204a, 204b , 314a, 314b, 504a, 504b Concave part 26a, 26b, 206a, 206b, 316a, 316b, 506a, 506b Convex part 100, 100a, 400, 400a Assembly device 116, 116a, 416, 416a Holding jig 122, 420 Punch Arrangement hole 126, 424 Punch 136, 434 Protrusion part 206a1, 206b1, 506a1, 506b1 Pressure contact part 206a2, 206b2, 506a2, 506b2 Protrusion part

Claims (12)

In a rotor for a permanent magnet embedded motor, comprising a rotor core configured by laminating thin steel plates, a magnet housing hole penetrating the rotor core in the axial direction, and a permanent magnet housed in the magnet housing hole,
By forming a recess in the end surface of the rotor core in the vicinity of the opening of the magnet receiving hole, the inner wall of the magnet receiving hole in the vicinity of the recess is plastically deformed to form a protruding portion, and at least a part of the protruding portion A rotor for a permanent magnet embedded motor, wherein the permanent magnet is fixed by being pressed against the permanent magnet.   The permanent magnet is arranged so that the axial end surface of the permanent magnet accommodated in the magnet accommodation hole is located inside the end surface of the rotor core, and a part of the convex portion is on the axial end surface of the permanent magnet. The rotor for a permanent magnet embedded motor according to claim 1, which protrudes. An inner rotor type permanent magnet embedded motor rotor,
The permanent magnet embedding according to claim 1 or 2, wherein the permanent magnet is press-contacted by the convex portion in the magnet accommodation hole so as not to form a gap between the permanent magnet and the inner wall on the outer periphery side of the magnet accommodation hole. Type motor rotor. An outer rotor type permanent magnet embedded motor rotor,
3. The permanent magnet embedding according to claim 1, wherein the permanent magnet is pressed by the convex portion in the magnet accommodation hole so as not to form a gap between the permanent magnet and the inner wall on the center side of the magnet accommodation hole. Type motor rotor. A first step of accommodating a permanent magnet in a magnet accommodation hole penetrating the rotor core in the axial direction; and the magnet accommodation in the vicinity of the recess by forming a recess in the end surface of the rotor core in the vicinity of the opening of the magnet accommodation hole. A rotor for a permanent magnet embedded motor comprising a second step of plastically deforming an inner wall of a hole to form a convex portion, and at least a part of the convex portion is pressed against the permanent magnet to fix the permanent magnet. Assembly method. In the first step, the permanent magnet is disposed such that an axial end surface of the permanent magnet housed in the magnet housing hole is located inside an end face of the rotor core,
The method of assembling a rotor for an embedded permanent magnet motor according to claim 5, wherein in the second step, a part of the convex portion protrudes on an end surface in the axial direction of the permanent magnet. An inner rotor type permanent magnet embedded motor rotor assembly method comprising:
The rotor for a permanent magnet embedded motor according to claim 5 or 6, wherein, in the second step, the recess is formed so as not to form a gap between the permanent magnet and the inner wall on the outer periphery side of the magnet housing hole. Assembly method. An assembly method for a rotor for an outer rotor type permanent magnet embedded motor,
The rotor for a permanent magnet embedded motor according to claim 5 or 6, wherein, in the second step, the recess is formed so as not to form a gap between the permanent magnet and the inner wall on the center side of the magnet housing hole. Assembly method. An assembly device for a rotor for a permanent magnet embedded motor in which a permanent magnet is housed in a magnet housing hole that passes through a rotor core configured by laminating thin steel plates in the axial direction,
A pair of holding jigs for holding the rotor core from one end face side and the other end face side;
A through-hole extending from one main surface of the holding jig to the other main surface and formed at a position corresponding to the vicinity of the opening of the magnet-accommodating hole; and An assembly apparatus for a rotor for a permanent magnet embedded motor, comprising a punch for forming a recess in an end face of the rotor core in the vicinity of an opening.   The permanent surface according to claim 9, wherein a main surface of the holding jig on the rotor core side is provided with a protrusion for positioning the permanent magnet in the magnet housing hole in the axial direction when holding the rotor core. Assembling device for rotor for embedded magnet type motor. An inner rotor-type permanent magnet embedded motor rotor assembly apparatus,
The rotor assembly apparatus for a permanent magnet embedded motor according to claim 9 or 10, wherein the recess is formed so as not to form a gap between the permanent magnet and the inner wall on the outer periphery side of the magnet housing hole. An outer rotor type permanent magnet embedded motor rotor assembly apparatus,
The rotor assembly apparatus for a permanent magnet embedded motor according to claim 9 or 10, wherein the concave portion is formed so as not to form a gap between the permanent magnet and a central inner wall of the magnet accommodation hole.

Images