JP6065568B2 - Magnetizer - Google Patents

Description

The present invention relates to Chaku磁装location for magnetizing a permanent magnet provided on the magnet-embedded rotor.

  An IPM motor (Interior Permanent Magnet Motor) having a structure in which a permanent magnet is embedded in a rotor is known. As a method for manufacturing a magnet-embedded rotor used in this IPM motor, for example, a method described in Patent Document 1 is known. In Patent Document 1, a cylindrical rotor having a plurality of magnet insertion holes formed radially is prepared, and a magnetic member for magnet before magnetization is embedded in the magnet insertion hole, and then the outer periphery of the rotor is covered. A magnetic device is arranged. The magnetizing device supplies magnetic flux from the outer peripheral surface of the rotor to the inside thereof, thereby magnetizing the magnet magnetic member embedded in the rotor.

Japanese Patent Application Laid-Open No. 2010-193587

  Incidentally, when magnetic flux is supplied from the outer peripheral surface of the rotor by a magnetizing device as in Patent Document 1, the amount of magnetic flux that can be supplied to the magnet magnetic member embedded in the rotor is the surface area of the outer peripheral surface of the rotor and the magnetization. It is determined by the amount of magnetic flux per unit area that can be supplied from the apparatus. Since there is a limit to the amount of magnetic flux per unit area that can be supplied from the magnetizing device, if the surface area of the outer peripheral surface of the rotor is smaller than the surface area of the magnetized surface of the magnet magnetic member, the magnet magnetic member It becomes difficult to supply a sufficient magnetic flux, and the magnetization is insufficient. When the magnetized magnetic member is insufficiently magnetized, a sufficient magnetic flux is not generated from the magnetized permanent magnet, and the magnetic flux density on the outer peripheral surface of the rotor is reduced. This causes a decrease in the amount of effective magnetic flux interlinked with the stator coil of the motor, which causes a reduction in the output torque of the rotor.

The present invention has been made in view of these circumstances, an object thereof is to provide a Chaku磁装location that can be more reliably magnetized magnetic member magnet embedded in the rotor.

A magnetizing apparatus that solves the above-described problem is a magnetizing apparatus that magnetizes a magnetic member for a magnet embedded in a cylindrical rotor, and includes an axial magnetized portion that is disposed to face an end face in the axial direction of the rotor. The axially magnetized portion is formed in the magnetic member for magnet with a magnetic path intersecting the axial direction of the rotor, and the axially magnetized portion is disposed to face the magnetic member for magnet And a pair of magnetized yokes arranged so as to sandwich the permanent magnet in the magnetizing direction of the magnet magnetic member, wherein the permanent magnet has a magnetic pole in a portion adjacent to one magnetized yoke. Unlike the magnetic pole of the portion adjacent to the other magnetizing yoke, the adjacent surface of the permanent magnet adjacent to the magnetizing yoke is inclined with respect to the axial direction of the rotor so as to face the axial end surface of the rotor. It is characterized by.

According to this configuration, even when the surface area of the magnetized surface of the magnet magnetic member is larger than the surface area of the outer peripheral surface of the rotor, sufficient magnetic flux can be supplied to the magnet magnetic member. The magnetic member can be more reliably magnetized. Further, the magnetic flux generated from the permanent magnet is in the order of “one magnetizing yoke of the pair of magnetizing yokes → the rotor → the magnetic member for magnet → the rotor → the other magnetizing yoke of the pair of magnetizing yokes”. The magnetic path that intersects the axial direction of the rotor can be easily formed in the magnetic member for magnets. Also, compared to the case where the adjacent surfaces of the permanent magnet and the pair of magnetized yokes are parallel to the axial direction of the rotor, the area of the magnetic pole of the permanent magnet is increased and the amount of magnetic flux supplied to the rotor is increased. Can do. For this reason, the magnetic member for magnets can be more reliably magnetized.

In the magnetizing device, it is preferable that the magnetizing direction of the permanent magnet is set in a direction orthogonal to a surface adjacent to the magnetizing yoke.
According to this configuration, since the amount of magnetic flux supplied from the permanent magnet to the magnetized yoke is the largest, the amount of magnetic flux supplied to the rotor can be increased. For this reason, the magnetic member for magnets can be more reliably magnetized.

According to these wearing磁装location, can be more reliably magnetized magnetic member magnet embedded in the rotor.

The perspective view which shows the perspective structure of a rotor. The perspective view which shows the perspective structure of the magnetizing apparatus of embodiment. The top view which shows the planar structure of the radial direction magnetization part about the magnetization apparatus of embodiment. The perspective view which shows the axial direction magnetization part and a part of rotor of the magnetizing apparatus of embodiment. FIG. 3 is a development view in which a part of the axially magnetized portion and the outer peripheral portion of the rotor are developed on a plane in the magnetizing device of the embodiment. The top view which shows a part of planar structure of a rotor. FIG. 3 is a development view in which a part of the axially magnetized portion and the outer peripheral portion of the rotor are developed on a plane in the magnetizing device of the embodiment. The expanded view which expand | deployed a part of outer peripheral part of the axial direction magnetization part on the plane about the modification of a magnetizing apparatus. The expanded view which expand | deployed the axial direction magnetization part and a part of outer peripheral part of a rotor on the plane about the other modification of the magnetizing apparatus. The expanded view which expand | deployed the axial direction magnetization part and a part of outer peripheral part of a rotor on the plane about the other modification of the magnetizing apparatus.

Hereinafter, an embodiment of a magnetizing apparatus and a magnetizing method will be described with reference to FIGS. First, referring to FIG. 1, the structure of a rotor to be magnetized will be described.
As shown in FIG. 1, the rotor 1 has a cylindrical shape. In the rotor 1, eight magnet insertion holes 2 penetrating in the axial direction are formed radially at equal angular intervals around the central axis m of the rotor 1. The magnet insertion hole 2 has a rectangular parallelepiped shape, and the cross-sectional shape orthogonal to the rotor radial direction is rectangular. A magnet magnetic member 3 made of a bonded magnet before magnetization is embedded in these magnet insertion holes 2.

  In the present embodiment, in order to increase the magnetization efficiency of the magnet magnetic member 3, the rotor 1 is divided into three core modules 10 in the axial direction as shown by solid lines in the drawing, and each core module 10 is for magnets. The magnetic member 3 is magnetized. Each core module 10 is configured by stacking a plurality of cylindrical electromagnetic steel plates in the axial direction. The axial direction, the circumferential direction, and the radial direction of each core module 10 coincide with the axial direction, the circumferential direction, and the radial direction of the rotor 1, respectively.

Next, the magnetizing apparatus will be described with reference to FIGS.
As shown in FIG. 2, the magnetizing device 4 is disposed so as to face the cylindrical radial magnetized portion 5 disposed to face the outer peripheral surface of the core module 10 and to both end surfaces of the core module 10 in the axial direction. It consists of cylindrical first and second axially magnetized portions 6 and 7.

  The radial magnetized portion 5 includes eight permanent magnets 50 and eight magnetized yokes 51 alternately arranged in the circumferential direction of the core module, and these are integrally assembled in a ring shape by a nonmagnetic member (not shown). It has been. The radially magnetized portion 5 is disposed to face the outer peripheral surface of the core module 10 with a predetermined gap therebetween.

  The permanent magnet 50 is disposed so as to be positioned on the outer side in the core module radial direction with respect to the magnet magnetic member 3 of the core module 10. Each permanent magnet 50 is formed such that its width in the circumferential direction of the core module increases as it goes outward in the radial direction of the core module. Each permanent magnet 50 has different magnetic poles on both sides in the circumferential direction of the core module as shown in the figure. Moreover, each permanent magnet 50 is arrange | positioned so that what adjoins the core module circumferential direction may oppose with the same magnetic pole. And the magnetizing yoke 51 is arrange | positioned so that it may be pinched | interposed into the part which the same magnetic pole of each permanent magnet 50 opposes.

  In the radially magnetized portion 5 configured as described above, a magnetic path is formed as indicated by an arrow in FIG. That is, the magnetic flux generated from the N pole of the permanent magnet 50 is “adjacent to the S pole of the magnetized yoke 51 adjacent to the N pole of the permanent magnet 50 → the core module 10 → the magnetic member 3 for the magnet → the core module 10 → the permanent magnet 50. It passes in the order of the magnetizing yoke 51 ". As a result, a magnetic path in the circumferential direction of the core module is formed in the magnet magnetic member 3. The magnetizing device 4 of the present embodiment magnetizes the magnet magnetic member 3 embedded in the core module 10 so as to have different magnetic poles in the circumferential direction of the core module as shown in FIG. The magnetizing device 4 magnetizes the magnet magnetic members 3 and 3 adjacent to each other in the rotor circumferential direction so as to face each other with the same magnetic pole. Thereby, N poles are formed in the outer peripheral portion of the rotor 1 by the portions facing the N poles of the magnetized permanent magnets, and the outer peripheral portion of the rotor 1 by the portions facing the S poles of the magnetized permanent magnets. S pole is formed in

Next, the structure of the axially magnetized portions 6 and 7 will be described. In addition, since these structures are the same, below, the 1st axial direction magnetized part 6 is demonstrated as a representative for convenience.
As shown in FIG. 2, the first axially magnetized portion 6 includes eight permanent magnets 60 and eight magnetized yokes 61 that are alternately arranged in the circumferential direction of the core module 10. It is assembled in an annular shape by a nonmagnetic member that does not. The first axially magnetized portion 6 is disposed to face one end surface of the core module 10 in the axial direction with a predetermined gap therebetween. FIG. 4 shows one permanent magnet 60 and a pair of magnetized yokes 61 arranged so as to sandwich the permanent magnet 60 and the magnetized yoke 61 constituting the first axially magnetized portion 6. FIG. FIG. 5 shows the permanent magnet 60, the pair of magnetized yokes 61 and 61, and the outer peripheral portions of the core module 10 developed on a plane.

  As shown in FIGS. 4 to 6, the pair of magnetized yokes 61, 61 is provided with a predetermined gap from each of the substantially fan-shaped areas A 1, A 2 defined by the magnet insertion holes 2 on one end surface of the core module 10. Are arranged opposite to each other. Regions A1 and A2 are regions indicated by point hatching in FIG. As shown in FIGS. 4 and 5, the pair of magnetized yokes 61 and 61 have substantially fan-shaped bottom surfaces so as to cover the regions A <b> 1 and A <b> 2 of one end surface of the core module 10. Each magnetized yoke 61 has a trapezoidal cross-sectional shape perpendicular to the core module radial direction, and is formed such that the width in the circumferential direction of the core module becomes narrower from the bottom to the top. Thereby, both side surfaces 61a and 61b in the core module circumferential direction of the magnetizing yoke 61 are inclined surfaces that form a predetermined angle in the core module axial direction. The side surfaces 61a and 61b of the pair of magnetized yokes 61 and 61 are opposed to each other in the circumferential direction of the core module, and the permanent magnet 60 is disposed so as to be sandwiched between them.

  As shown in FIGS. 4 and 5, the permanent magnet 60 also has a trapezoidal cross-sectional shape perpendicular to the core module radial direction. More specifically, the permanent magnet 60 has a rectangular bottom surface extending in the core module radial direction along the magnet magnetic member 3, and the width in the circumferential direction of the core module increases from the bottom surface toward the top surface. Is formed. Thereby, both side surfaces 60a and 60b in the circumferential direction of the core module of the permanent magnet 60 are inclined surfaces that are inclined with respect to the axial direction of the core module so as to face the axial end surface of the core module 10. The side surfaces 60a and 60b of the permanent magnet 60 and the side surfaces 61a and 61b of the pair of magnetized yokes 61 and 61 are in contact with each other.

  The second axially magnetized portion 7 is similarly configured. The permanent magnets 60 of these axially magnetized portions 6 and 7 are magnetized as shown in FIG. FIG. 7 shows the axially magnetized portions 6 and 7 and the outer peripheral portions of the core module 10 developed on a plane.

  As shown in FIG. 7, the permanent magnets 60 of the axially magnetized portions 6 and 7 have different magnetic poles on the side surfaces 60 a and 60 b adjacent to the magnetized yoke 61. Further, the permanent magnets 60 of the axially magnetized portions 6 and 7 are arranged so that those adjacent in the circumferential direction of the core module face each other with the same magnetic pole.

Next, the operation of the magnetizing device 4 of this embodiment will be described.
The permanent magnet 60 and the magnetizing yoke 61 of each of the axially magnetized portions 6 and 7 form a magnetic path as shown by arrows in FIG. That is, the magnetic flux generated from the N-pole side surface 60a of each permanent magnet 60 is “the magnetizing yoke 61 adjacent to the N-pole side surface 60a of the permanent magnet 60 → the core module 10 → the magnetic member 3 for the magnet → the core module 10 → permanently. The magnet 60 passes in the order of the magnetizing yoke 61 "adjacent to the side surface 60b of the south pole. Thus, a magnetic path in the circumferential direction of the core module is formed in the magnet magnetic member 3, and the magnet magnetic member 3 is magnetized.

  In the present embodiment, as shown in FIG. 7, the adjacent surfaces 60a, 60b, 61a, 61b of the permanent magnet 60 and the magnetizing yoke 61 are inclined with respect to the core module axial direction. For this reason, compared with the case where those adjacent surfaces 60a, 60b, 61a, 61b are parallel to the axial direction of the core module, the area of the magnetic pole of the permanent magnet 60 is made larger and supplied from each permanent magnet 60 to the core module 10. The amount of magnetic flux can be increased. For this reason, the magnetic member 3 for magnets can be more reliably magnetized.

  Further, as shown in FIG. 2, the magnetizing device 4 of the present embodiment uses the radially magnetized portion 5 and the axially magnetized portions 6 and 7 in combination, so that the outer peripheral surface of the core module 10 and both axial ends thereof are used. Magnetic flux can be supplied to the core module 10 from the surface. Therefore, when compared with a conventional magnetizing apparatus that supplies magnetic flux only from the outer peripheral surface of the core module 10, the amount of magnetic flux supplied to the core module 10 increases. Thereby, the magnetic member 3 for magnets can be more reliably magnetized.

As described above, according to the magnetizing device 4 of the present embodiment, the following effects can be obtained.
(1) The axially magnetized portions 6 and 7 are arranged opposite to each other on both axial end surfaces of the core module 10. A magnetic path in the circumferential direction of the core module was formed in the magnet magnetic member 3 embedded in the core module 10 by the axially magnetized portions 6 and 7. Thus, even when the surface area of the magnetized surface of the magnet magnetic member 3 is larger than the surface area of the outer peripheral surface of the rotor 1, the magnet magnetic member 3 can be sufficiently magnetized.

  (2) A pair of axially magnetized portions 6, 7 are arranged so as to sandwich the permanent magnet 60 in the magnetization direction of the permanent magnet 60 disposed opposite to the magnet magnetic member 3 and the magnet magnetic member 3. The magnetized yokes 61 and 61 are used. In the permanent magnet 60, the magnetic pole in the portion adjacent to one magnetized yoke 61 is different from the magnetic pole in the portion adjacent to the other magnetized yoke. Thereby, the magnetic path of the core module circumferential direction can be easily formed in the magnetic member 3 for magnets.

  (3) The adjacent surfaces 60 a and 60 b of the permanent magnet 60 adjacent to the magnetizing yoke 61 are inclined with respect to the axial direction of the core module 10 so as to face the axial end surface of the core module 10. As a result, the amount of magnetic flux supplied to the core module 10 increases, so that the magnet magnetic member 3 can be more reliably magnetized.

  (4) The axially magnetized portions 6 and 7 are configured by alternately arranging the permanent magnets 60 and the magnetized yokes 61 in an annular shape in the circumferential direction of the core module. As a result, the core module 10 in which the magnet magnetic members 3 are radially embedded as in the present embodiment can be obtained by simply disposing the axially magnetized portions 6 and 7 on the both end surfaces in the axial direction. All the magnetic members 3 for magnets of the module 10 can be magnetized. This facilitates the magnetizing process.

  (5) The radially magnetized portion 5 is disposed opposite to the outer peripheral surface of the core module 10. Then, the magnetic flux is supplied to the magnet magnetic member 3 from the outer peripheral surface of the core module 10 by the radial magnetized portion 5. As a result, the amount of magnetic flux supplied to the core module 10 increases, so that the magnet magnetic member 3 of the core module 10 can be more reliably magnetized.

  (6) The rotor 1 is divided into three core modules 10 in the axial direction, and the magnet magnetic member 3 is magnetized for each core module 10. Thereby, even if the rotor 1 is long in the axial direction as in the present embodiment, a sufficient magnetic flux can be supplied to the magnet magnetic member 3, so that the magnet magnetic member 3 can be more reliably magnetized.

In addition, the said embodiment can also be implemented with the following forms which changed this suitably.
It is effective to set the magnetizing direction of the permanent magnets 60 of the axially magnetized portions 6 and 7 to a direction orthogonal to the adjacent surfaces 60 a and 60 b with the magnetized yoke 61. Specifically, as shown in FIG. 8, the permanent magnet 60 is divided into two magnet pieces 62 and 63 in the circumferential direction of the core module. And the magnetization direction of one magnet piece 62 is set to the direction orthogonal to the side surface 60a. The magnetizing direction of the other magnet piece 63 is set to a direction orthogonal to the side surface 60b. According to such a configuration, since the amount of magnetic flux supplied from the permanent magnet 60 to the magnetizing yoke 61 is the largest, the amount of magnetic flux supplied to the core module 10 is further increased. For this reason, the magnetic member 3 for magnets can be more reliably magnetized. A similar configuration may be applied to the permanent magnet 50 of the radially magnetized portion 5. Further, the magnetizing direction of the permanent magnet 60 may not be a direction orthogonal to the adjacent surfaces 61 a and 61 b with the magnetizing yoke 61.

  In the above embodiment, the adjacent surfaces 60a, 60b, 61a, 61b of the permanent magnet 60 and the magnetized yoke 61 of the axially magnetized portions 6, 7 are inclined with respect to the axial direction of the core module. Instead, as shown in FIG. 9, the adjacent surfaces 60a, 60b, 61a, 61b of the permanent magnet 60 and the magnetizing yoke 61 may be parallel to the core module axial direction.

  In the above embodiment, the axially magnetized portions 6 and 7 are disposed opposite to the axially opposite end faces of the core module 10 respectively. However, for example, as shown in FIG. You may arrange | position the magnetic part 6 facing. Such a configuration is effective when the axial thickness of the core module 10 is thin.

In the above embodiment, the radial magnetized portion 5 may be omitted.
In the above embodiment, the axially magnetized portions 6 and 7 are configured by arranging the permanent magnet 60 and the magnetized yoke 61 in an annular shape, but the configuration of the axially magnetized portions 6 and 7 is not limited thereto. . By appropriately changing the arrangement and shape of the permanent magnet 60 and the magnetizing yoke 61 constituting the axially magnetized portions 6 and 7, for example, the magnet magnetic member can be changed to a V shape, a U shape, or a U shape. Magnetization of the magnetic member for the magnet is also possible for the embedded core module.

In the above embodiment, the permanent magnet is used as the magnetism generating portion of the axially magnetized portions 6 and 7, but a magnetized coil may be used instead.
In the above embodiment, each core module 10 is made of a plurality of electromagnetic steel plates, but may be made of a single electromagnetic steel plate. Moreover, you may use electromagnetic soft iron instead of an electromagnetic steel plate.

In the above embodiment, the rotor 1 is divided into three core modules 10 in the axial direction, and the magnet magnetic member 3 is magnetized for each core module 10. Instead of this, the magnetic member for magnet 3 may be magnetized as it is without dividing the rotor 1.
In the above embodiment, a bonded magnet is used as the magnetic member 3 for a magnet, but a sintered magnet may be used.

  A1, A2 ... area, 1 ... rotor, 2 ... magnet insertion hole, 3, 3a ... magnetic member for magnet, 3b ... one end surface, 3c ... other end surface, 4 ... magnetizing device, 5 ... radial magnetized portion, 6 ... 1st axial direction magnetized part, 7 ... 2nd axial direction magnetized part, 10 ... Core module, 60 ... Permanent magnet, 61 ... Magnetized yoke, 60a, 60b, 61a, 61b ... Side surface (adjacent surface) .

Claims (2)

A magnetizing device for magnetizing a magnetic member for a magnet embedded in a cylindrical rotor,
An axially magnetized portion disposed opposite to the axial end face of the rotor;
The axially magnetized portion is formed in the magnetic member for a magnet with a magnetic path intersecting the axial direction of the rotor ,
The axially magnetized portion is
A permanent magnet disposed opposite to the magnet magnetic member;
A pair of magnetized yokes disposed so as to sandwich the permanent magnet in the magnetizing direction of the magnet magnetic member;
The permanent magnet has a magnetic pole in a portion adjacent to one magnetized yoke, different from a magnetic pole in a portion adjacent to the other magnetized yoke,
The magnetizing apparatus , wherein an adjacent surface of the permanent magnet adjacent to the magnetizing yoke is inclined with respect to an axial direction of the rotor so as to face an axial end surface of the rotor . The magnetizing apparatus according to claim 1 , wherein
The magnetizing device, wherein the magnetizing direction of the permanent magnet is set to a direction orthogonal to a surface adjacent to the magnetizing yoke.