JP7168724B1 - Manufacturing method of permanent magnet rotor - Google Patents

Abstract

A thermosetting tape wound around a permanent magnet can be efficiently heated and cured in a short time while preventing irreversible demagnetization of the permanent magnet. A rotor 2 manufactured in a cylindrical shape, a pre-magnetized permanent magnet 3 adhered to the outer peripheral surface of the rotor 2, and a PG tape wound around the outer peripheral surface of the permanent magnet 3. 4 is housed inside a magnetic case 10 having an iron core 12 with a coil 11 wound around the inner periphery of a cylindrical member made of a ferromagnetic material. The PG tape 4 is hardened by applying a high-frequency current to and heating the permanent magnet 3 by the principle of high-frequency induction heating. [Selection drawing] Fig. 1

Description

The present invention relates to a method of manufacturing a permanent magnet rotor.

A conventional method for manufacturing a permanent magnet rotor will be described with reference to FIGS. First, as shown in FIG. 5(A), a columnar rotor 2 having a rotating shaft 1 penetrating through and fixed to the center thereof is manufactured. This rotor 2 is the main part of the permanent magnet rotor. After that, an adhesive is applied to the outer peripheral surface of the rotor 2, and as shown in FIG. It is arranged so as to cover without overlapping and is adhered to the outer peripheral surface. After that, as shown in FIG. 5(C), a PG (prepreg glass cloth) tape 4 containing epoxy resin, which is a thermosetting resin, is placed on the outside of the permanent magnets 3 attached to the outer peripheral surface of the rotor 2. Wrap in a spiral while overlapping in the direction. The PG tape 4 is a so-called thermosetting tape that is hardened by heating and drying, and is obtained by impregnating a glass cloth with an epoxy resin, which is a thermosetting resin, and cutting it into tapes in a semi-hardened state.

Next, as shown in FIG. 5(D), the outer side of the PG tape 4 (see FIG. 5(C)) wound around the permanent magnet 3 is covered with a cylindrical magnetic body made of a ferromagnetic material. Cover with case 5. The inner diameter (diameter of the hole) of the magnetic case 5 is equal to the outer diameter of the rotor 2 around which the PG tape 4 is wound (that is, the outer diameter of the rotor 2 including the thickness of the permanent magnets 3 and the thickness of the PG tape 4). ), and the length in the axial direction is greater than or equal to the length of the rotor 2 in the axial direction. Therefore, by housing the rotor 2 around which the PG tape 4 is wound inside the magnetic case 5 , the entire outer periphery of the rotor 2 can be covered with the magnetic case 5 .

Next, as shown in FIG. 5E, the rotor 2 covered with the magnetic case 5 is heated from the outside of the magnetic case 5 using an oven or the like. This process is called a heat treatment process. The heating temperature and heating time at this time are set so as to achieve both sufficient heat curing of the PG tape 4 and prevention of irreversible demagnetization of the permanent magnets 3 . Note that irreversible demagnetization is a phenomenon in which a magnet is demagnetized by applying high-temperature heat to the magnet, and the magnetic force is weakened without returning to its original state after cooling. As a known countermeasure, demagnetization can be suppressed by covering the circumference of the magnet with a magnetic material (that is, covering the circumference of the permanent magnet 3 with the magnetic material case 5).

Through the heat treatment process, the thermosetting resin contained in the PG tape 4 wound around the rotor 2 is thermoset. At this time, since the permanent magnets 3 attached to the rotor 2 are heated while being covered with the magnetic case 5 made of a ferromagnetic material, irreversible demagnetization does not occur.

After the heat treatment process is completed, as shown in FIG. 5(F), the magnetic case 5 is removed from the rotor 2 around which the PG tape 4 is wound. By the steps up to this point, the permanent magnet rotor 6 having the rotor 2 in which the permanent magnets 3 are firmly fixed to the outer peripheral surface and the irreversible demagnetization is suppressed is completed. Conventionally, the permanent magnet rotor 6 has been manufactured by such a manufacturing method.

A method of winding a tape containing a thermosetting resin to fix a magnet to a rotor is described in Patent Document 1, for example.

Japanese Utility Model Laid-Open No. 9-131027

In the conventional manufacturing method, irreversible demagnetization of the permanent magnets 3 fixed to the outer peripheral surface of the rotor 2 covered with the magnetic case 5 is prevented, and the PG tape 4 wrapped around the permanent magnets 3 is prevented from being demagnetized. The heating temperature and heating time are set so that the adhesive is heated in an oven or the like. However, in order to harden the PG tape 4 wound around the permanent magnet 3, it is necessary to heat the rotor 2 while it is covered with the magnetic case 5. Therefore, it is difficult to heat the tape in a short time. . Further, in the conventional manufacturing method, heating is performed by hot air in an oven or the like, which is inefficient, and in addition, an oven or the like large enough to accommodate the magnetic case 5 is required.

As described above, in the conventional manufacturing method, it is difficult to prevent irreversible demagnetization of the permanent magnet 3 and efficiently heat and harden the PG tape 4 wrapped around the permanent magnet 3 in a short period of time. rice field.

The present invention has been made to solve the above-mentioned problems, and the thermosetting tape wound around the permanent magnet is efficiently heated in a short time to be cured while preventing irreversible demagnetization of the permanent magnet. It is intended to

In order to achieve the above object, the present invention provides a method of manufacturing a permanent magnet rotor comprising: a rotor manufactured in a cylindrical shape; A cylindrical member made of a ferromagnetic material having an inner diameter larger than the outer diameter of the permanent magnet rotor , the permanent magnet rotor having a permanent magnet and a thermosetting tape wound around the outer peripheral surface of the permanent magnet. Inside a magnetic case having an iron core with a coil wound on the inner circumference of the rotor, a gap is provided between the outer circumference of the permanent magnet rotor, the inner circumference of the cylindrical member, and the iron core. A high-frequency current is passed through the coil to heat the permanent magnet by the principle of high-frequency induction heating, thereby curing the thermosetting tape.

In this way, an iron core with a coil wound around the inner circumference of the magnetic case is provided, a high-frequency current is passed through the coil, and the permanent magnet is heated by the principle of high-frequency induction heating. By hardening the thermosetting tape wound around the permanent magnets covering the outer peripheral surface of the rotor, irreversible demagnetization of the permanent magnets can be prevented in the same manner as in the conventional manufacturing method. The thermosetting tape can be cured by heating in a shorter time and more efficiently than the manufacturing method of .

According to the present invention, the thermosetting tape wrapped around the permanent magnet can be efficiently heated and cured in a short time while preventing irreversible demagnetization of the permanent magnet.

FIG. 4 is a diagram showing a rotor housed in a magnetic case according to the first embodiment; FIG. 10 is a diagram showing a rotor housed in a magnetic case according to the second embodiment; FIG. 11 is a diagram showing a rotor housed in a magnetic case according to a third embodiment; FIG. 11 is a diagram showing a rotor housed in a magnetic case according to a fourth embodiment; It is a transition diagram showing a manufacturing method of a conventional permanent magnet rotor.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments according to the present invention will be described with reference to the drawings.

[1. First Embodiment]
First, a first embodiment according to the present invention will be described with reference to FIGS. 1(A) and 1(B). FIGS. 1A and 1B are diagrams used for explaining a method of manufacturing a permanent magnet rotor 6 according to this embodiment. FIG. 1A is a view of the rotor 2 housed in the magnetic case 10 viewed from the axial direction, and FIG. 1B is a view of the rotor 2 housed in the magnetic case 10 from the axial direction It is a view seen from an orthogonal direction, and only the magnetic case 10 is a cross section. In FIGS. 1A and 1B, the same reference numerals are given to the same parts as in FIGS. 5A to 5F.

The manufacturing method of the permanent magnet rotor 6 according to the present embodiment differs from the conventional manufacturing method in that the magnetic case 10 is used instead of the magnetic case 5 in the heat treatment process. The magnetic case 10 is a cylindrical member made of a ferromagnetic material, and the inner diameter (diameter of the hole) is equal to the outer diameter of the rotor 2 around which the PG tape 4 is wound (that is, the thickness of the permanent magnet 3 and the PG tape 4). the outer diameter of the rotor 2 including the thickness of the tape 4), and the length in the axial direction is greater than or equal to the length of the rotor 2 in the axial direction. For this reason, a jig (not shown) is used to align the central axis P1 of the hole in the magnetic case 10 with the central axis P2 of the rotor 2, and the rotor 2 (permanently attached to the outer peripheral surface) is mounted inside the magnetic case 10. By accommodating the rotor 2) to which the magnet 3 is adhered and the PG tape 4 wound around the permanent magnet 3, the inner peripheral surface of the magnetic case 10 and the PG tape 4 wound around the rotor 2 are accommodated. The entire outer circumference of the rotor 2 can be covered with the magnetic case 10 while leaving a gap of about several millimeters between them.

Further, the magnetic case 10 is formed with a concave portion 10c extending linearly from one end to the other end in the axial direction (direction parallel to the central axis P1) on the inner circumference. As shown in FIG. 1A, the width of this recess 10c is sufficiently smaller than the outer diameter of the rotor 2 around which the PG tape 4 is wound. Further, an iron core 12 around which a coil 11 is wound is fixed to the central portion of the recess 10c in the width direction. As shown in FIG. 1(B), the iron core 12 is shaped like a square bar extending along the recess 10c, has the same length in the axial direction as the magnetic case 10, and has a coil 11 wound around its outer circumference. .

The core 12 around which the coil 11 is wound has a distance D1 from the central axis P1 that is approximately the same as a distance D2 from the central axis P1 to the inner peripheral surface of the magnetic case 10 . Therefore, if the rotor 2 around which the PG tape 4 is wound is housed inside the magnetic case 10, there will be a gap of several millimeters between the iron core 12 around which the coil 11 is wound and the PG tape 4 wound around the rotor 2. A certain amount of gap is left.

The heat treatment process is performed while the rotor 2 around which the PG tape 4 is wound is housed inside the magnetic case 10 as described above. In the heat treatment process of the present embodiment, a high-frequency current is passed through the coil 11 wound around the iron core 12 . Then, the permanent magnet 3 facing the iron core 12 (that is, the permanent magnet 3 adhered to the outer peripheral surface of the rotor 2) is heated by the principle of high-frequency induction heating, and the heat generated from the heated permanent magnet 3 heats the permanent magnet 3. The thermosetting resin contained in the PG tape 4 wound around is thermoset. Here, as shown in FIG. 1A, the rotor 2 housed in the magnetic case 10 is rotated about the rotation shaft 1 in the direction indicated by the arrow Ar1. By doing so, the entire PG tape 4 wound around the rotor 2 is uniformly heated and cured. Through such a heat treatment process, the PG tape 4 is hardened and the permanent magnets 3 are firmly fixed to the outer peripheral surface of the rotor 2 .

In the heat treatment process, the value of the current flowing through the coil 11 and the time during which the current is passed through the coil 11 are set to a heating temperature and a time that achieve both sufficient thermal hardening of the PG tape 4 and prevention of irreversible demagnetization of the permanent magnet 3. The heating time is set to the value and time obtained.

In this heat treatment process, as in the conventional case, the permanent magnets 3 attached to the rotor 2 are heated while being covered with the magnetic case 10 made of a ferromagnetic material, so irreversible demagnetization occurs. do not have.

After the heat treatment process is completed, the magnetic case 10 is removed from the rotor 2 around which the PG tape 4 is wound. By the steps up to this point, the permanent magnet rotor 6 having the rotor 2 in which the permanent magnets 3 are firmly fixed to the outer peripheral surface and the irreversible demagnetization is suppressed is completed. In this embodiment, the permanent magnet rotor 6 is manufactured by such a manufacturing method.

As described above, in the method of manufacturing the permanent magnet rotor 6 according to the first embodiment, the rotor 2 manufactured in a cylindrical shape and the pre-magnetized rotor 2 adhered to the outer peripheral surface of the rotor 2 are provided. A permanent magnet rotor 6 composed of a permanent magnet 3 and a PG tape 4 as a thermosetting tape wound around the outer peripheral surface of the permanent magnet 3 is mounted on the inner periphery of a cylindrical member made of a ferromagnetic material. , a core 12 around which a coil 11 is wound is housed inside a magnetic case 10, a high-frequency current is passed through the coil 11, and the permanent magnet 3 facing the core 12 is heated by the principle of high-frequency induction heating. , the PG tape 4 was cured.

As a result, it is possible to prevent changes in magnetic properties such as irreversible demagnetization of the permanent magnets 3 as in the conventional manufacturing method. Since the PG tape 4 is heated, the PG tape 4 can be cured by heating in a shorter time and more efficiently than in the conventional manufacturing method. Thus, according to the method of manufacturing the permanent magnet rotor 6 according to the present embodiment, the PG tape 4 wrapped around the permanent magnets 3 can be efficiently heated in a short time while preventing the permanent magnets 3 from being irreversibly demagnetized. can be hardened.

Further, in the method of manufacturing the permanent magnet rotor 6 according to the present embodiment, the rotor 2 housed inside the magnetic case 10 is rotated about the rotation shaft 1 during the heat treatment process. As a result, the entire PG tape 4 wound around the rotor 2 can be uniformly heated and cured.

Further, in the method of manufacturing the permanent magnet rotor 6 according to the present embodiment, the recess 10c is provided in the inner circumference of the magnetic case 10, and the iron core 12 around which the coil 11 is wound is accommodated in this recess 10c. As a result, the coil 11 can be brought closer to the permanent magnets 3 attached to the rotor 2 housed inside the magnetic case 10, and the inner peripheral surface of the magnetic case 10 can be brought close to the permanent magnets 3. can get closer. Thus, the PG tape 4 wrapped around the permanent magnet 3 can be efficiently heated and hardened in a short time while preventing irreversible demagnetization of the permanent magnet 3 more reliably.

[2. Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 2 is a diagram used for explaining the method of manufacturing the permanent magnet rotor 6 according to this embodiment. FIG. 2 is an axial view of the rotor 2 housed in the magnetic case 20. As shown in FIG. In FIG. 2, the same reference numerals are given to the same parts as those in FIGS. 1A, 1B and 5A to 5F.

The second embodiment differs from the first embodiment in the method of manufacturing the permanent magnet rotor 6, and uses the magnetic case 20 instead of the magnetic case 10 in the heat treatment process. .

The magnetic case 20 is a cylindrical member made of a ferromagnetic material, and the inner diameter (hole diameter) is equal to the outer diameter of the rotor 2 around which the PG tape 4 is wound (that is, the thickness of the permanent magnet 3 and the PG tape 4). the outer diameter of the rotor 2 including the thickness of the tape 4), and the length in the axial direction is greater than or equal to the length of the rotor 2 in the axial direction. Further, the inner diameter of the magnetic case 20 is larger than that of the magnetic case 10 (see FIG. 1A) used in the first embodiment. Specifically, the inner diameter of the magnetic case 20 is equal to the inner diameter of the magnetic case 10 plus the length of two depths of the recess 10c.

A plurality of iron cores 12 around which coils 11 are wound are arranged close to the magnetic case 20 at regular intervals in the circumferential direction of the inner peripheral surface so as to cover the entire inner peripheral surface. As in the first embodiment, each iron core 12 is in the shape of a square bar extending in the axial direction of the magnetic case 20. The axial length of each iron core 12 is approximately the same as that of the magnetic case 20. is wrapped around.

Here, the iron core 12 around which the coil 11 is wound has a distance D3 from the central axis P3 of the hole of the magnetic case 20, which is approximately the same as the distance D1 shown in FIG. 1(A). For this reason, when the rotor 2 around which the PG tape 4 is wound is accommodated inside the magnetic case 20 , there are several gaps between each of the iron cores 12 around which the coils 11 are wound and the PG tape 4 wound around the rotor 2 . A gap of about a millimeter is left.

The heat treatment process is performed while the rotor 2 around which the PG tape 4 is wound is housed inside the magnetic case 20 in this way. Specifically, by passing a high-frequency current through the coil 11 wound around the iron core 12, the permanent magnet 3 facing the iron core 12 is heated by the principle of high-frequency induction heating, and the heat generated from the heated permanent magnet 3 is As a result, the thermosetting resin contained in the PG tape 4 wound around the permanent magnet 3 is thermoset. Here, in the present embodiment, since a plurality of iron cores 12 around which coils 11 are wound are arranged in the circumferential direction with almost no gaps on the entire inner peripheral surface of the magnetic case 20, the rotor 2 can be rotated. The entire PG tape 4 wound around the rotor 2 can be uniformly heated and hardened without the need for heating. Through such a heat treatment process, the PG tape 4 is hardened and the permanent magnets 3 are firmly fixed to the outer peripheral surface of the rotor 2 .

In the heat treatment process, the value of the current flowing through the coil 11 and the time during which the current is passed through the coil 11 are set to a heating temperature and a time that achieve both sufficient thermal hardening of the PG tape 4 and prevention of irreversible demagnetization of the permanent magnet 3. The heating time is set to the value and time obtained.

In this heat treatment process, the permanent magnets 3 attached to the rotor 2 are heated while being covered with the magnetic case 20 made of a ferromagnetic material, so irreversible demagnetization does not occur. The processes after the heat treatment process are completed are the same as those in the first embodiment, so descriptions thereof will be omitted. In this embodiment, the permanent magnet rotor 6 is manufactured by such a manufacturing method.

As described above, in the method of manufacturing the permanent magnet rotor 6 according to the second embodiment, the plurality of iron cores 12 with the coils 11 wound around the inner peripheral surface of the magnetic case 20 are arranged around the inner peripheral surface. A permanent magnet rotor 6 is housed inside the magnetic case 20, and a high-frequency current is applied to the coil 11 to set the permanent magnet 3 facing the iron core 12 on the principle of high-frequency induction heating. The PG tape 4 was cured by heating.

As a result, as in the first embodiment, the PG tape 4 wrapped around the permanent magnet 3 can be efficiently heated in a short time while preventing the permanent magnet 3 from changing its magnetic characteristics such as irreversible demagnetization. can be hardened.

In addition, in the method of manufacturing the permanent magnet rotor 6 according to the present embodiment, since it is not necessary to rotate the rotor 2 during the heat treatment process, the work during the heat treatment process can be simplified as compared with the first embodiment. At the same time, the PG tape 4 can be cured in a shorter time.

[3. Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIGS. 3(A) and 3(B). 3A and 3B are diagrams used for explaining the method of manufacturing the permanent magnet rotor 6 according to this embodiment. FIG. 3(A) is an axial view of the rotor 2 accommodated in the magnetic case 30, and FIG. 3(B) is a partially enlarged view of FIG. 3(A). In FIGS. 3A and 3B, the same parts as those in FIGS. 1A, 1B, 2 and 5A to 5F are given the same reference numerals.

The third embodiment differs from the first and second embodiments in the method of manufacturing the permanent magnet rotor 6, and uses a magnetic case 30 instead of the magnetic cases 10 and 20 in the heat treatment process. It's like

In the magnetic case 30 shown in FIGS. 3A and 3B, the width of the iron core 12 around which the coil 11 is wound, which is arranged side by side in the circumferential direction on the inner peripheral surface of the magnetic case 20 shown in FIG. , and the number is reduced, and the rest of the configuration is the same as that of the magnetic case 20. As shown in FIG. Specifically, coils are arranged on the inner peripheral surface of the magnetic case 30 in accordance with the circumferential arrangement of the permanent magnets 3 attached to the outer peripheral surface of the rotor 2 accommodated inside the magnetic case 30 . An iron core 12 around which 11 is wound is arranged.

In the example of FIG. 3A, 12 permanent magnets 3 are arranged on the outer peripheral surface of the rotor 2 in the circumferential direction. Correspondingly, 12 iron cores 12 around which coils 11 are wound are arranged on the inner peripheral surface of the magnetic case 30 at regular intervals in the circumferential direction. Here, the width of the iron core 12 around which the coil 11 is wound (that is, the width of the iron core 12 including the diameter of the coil 11) is approximately the same as the width of the permanent magnet 3, for example.

By doing so, when the rotor 2 is accommodated inside the magnetic case 30, the permanent magnets 3 attached to the outer peripheral surface of the rotor 2 and the coils provided on the inner peripheral surface of the magnetic case 30 are connected. The iron core 12 around which the wire 11 is wound can be arranged to face each other, and the heat treatment process is performed in the state of being arranged to face each other. The heat treatment process and the processes after the heat treatment process are completed are the same as those in the second embodiment, and thus description thereof is omitted. In this embodiment, the permanent magnet rotor 6 is manufactured by such a manufacturing method.

As described above, in the method of manufacturing the permanent magnet rotor 6 according to the third embodiment, the magnetic case 30 is arranged in accordance with the circumferential arrangement of the permanent magnets 3 attached to the outer peripheral surface of the rotor 2 . The iron cores 12 around which the coils 11 are wound are arranged on the inner peripheral surface of the inner peripheral surface at regular intervals in the circumferential direction of the inner peripheral surface, and the magnetic case 30 is used to perform the heat treatment process.

Thus, similarly to the second embodiment, the PG tape 4 wrapped around the permanent magnet 3 can be efficiently heated in a short time while preventing a change in magnetic characteristics such as irreversible demagnetization of the permanent magnet 3. can be hardened.

Further, in the method of manufacturing the permanent magnet rotor 6 according to the present embodiment, when the rotor 2 is accommodated inside the magnetic case 30, the permanent magnets 3 attached to the outer peripheral surface of the rotor 2 and the magnetic case 30 Since the iron core 12 around which the coil 11 is wound, which is provided on the inner peripheral surface of the rotor 2, can be arranged to face each other, the permanent magnets 3 attached to the outer peripheral surface of the rotor 2 are not excessively heated during the heat treatment process. can be prevented from joining. As a result, in the method of manufacturing the permanent magnet rotor 6 according to the third embodiment, irreversible demagnetization can be more reliably prevented, and the PG tape 4 can be cured more efficiently in a shorter time.

[4. Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described with reference to FIGS. 4(A) and 4(B). 4A and 4B are diagrams used for explaining the method of manufacturing the permanent magnet rotor 6 according to this embodiment. 4A is an axial view of the rotor 2 housed in the magnetic case 30, and FIG. 4B is a partially enlarged view of FIG. 4A. In FIGS. 4A and 4B, the same parts as those in FIGS. 1A, 1B, 2, 3A, 3B and 5A to 5F are The same reference numerals are given.

The fourth embodiment is a manufacturing method for manufacturing a permanent magnet rotor 6 that is smaller than the permanent magnet rotors 6 manufactured by the manufacturing methods of the first to third embodiments.

The rotor 2 shown in FIGS. 4A and 4B is smaller and has a smaller diameter than the rotor 2 used in the first to third embodiments. Therefore, in this embodiment, the outer side of the PG tape 4 wound around the permanent magnets 3 attached to the outer peripheral surface of the rotor 2 is covered with a cylindrical iron plate 40 . This iron plate 40 is a member for absorbing the difference between the outer diameter of the rotor 2 used in the first to third embodiments and the outer diameter of the rotor 2 used in this embodiment. It has a thickness corresponding to the difference.

On the other hand, as for the magnetic case, any one of the magnetic cases 10, 20, and 30 used in the first to third embodiments may be used. Here, the magnetic case 30 is used as an example.

In the present embodiment, the rotor 2 is housed inside the magnetic case 30 while the outside of the PG tape 4 is covered with the iron plate 40 . At this time, there is a gap of several millimeters between the iron core 12 around which the coil 11 is wound and the iron plate 40 located on the outermost periphery of the rotor 2, which is provided on the inner peripheral surface of the magnetic case 30. becomes.

The heat treatment process is performed in a state in which the rotor 2 covered with the iron plate 40 is accommodated inside the magnetic case 20 in this manner. At this time, the iron plate 40 facing the iron core 12 is heated by the principle of high-frequency induction heating, and the thermosetting resin contained in the PG tape 4 wound around the rotor 2 is thermally cured.

After completing the heat treatment process, the magnetic case 30 is removed from the rotor 2 covered with the iron plate 40 . After that, the iron plate 40 is removed from the rotor 2 around which the PG tape 4 is wound. By the steps up to this point, the permanent magnet 3 is firmly fixed to the outer peripheral surface, and the permanent magnet rotor 6 having the rotor 2 in which irreversible demagnetization is suppressed (that is, the permanent magnet manufactured in the first to third embodiments) A permanent magnet rotor 6) smaller than the rotor 6 is completed. In this embodiment, the small permanent magnet rotor 6 is manufactured by such a manufacturing method.

As described above, in the method of manufacturing the permanent magnet rotor 6 according to the fourth embodiment, the permanent magnet rotor 6 in which the outer side of the PG tape 4 is covered with the cylindrical iron plate 40 is placed in the magnetic case 30 . , a high-frequency current is passed through the coil 11, and the iron plate 40 facing the core 12 is heated by the principle of high-frequency induction heating, thereby hardening the PG tape 4 via the iron plate 40. - 特許庁

As a result, even for the permanent magnet rotor 6 that is smaller than the permanent magnet rotor 6 manufactured in the first to third embodiments, the PG tape 4 is prevented from changing magnetic characteristics such as irreversible demagnetization of the permanent magnet 3 . can be produced by efficiently heating and curing in a short time.

[5. Other embodiments]

Incidentally, in the first to fourth embodiments described above, the PG tape 4 is used as the thermosetting tape for firmly fixing the permanent magnets 3 to the outer peripheral surface of the rotor 2 . For example, other thermosetting tape containing thermosetting resin such as epoxy resin may be used.

In addition, in the above-described fourth embodiment, the iron plate 40 is used as the coating member covering the outer side of the PG tape 4 wound around the rotor 2, but the iron plate 40 is an example, and the coating member may be made of iron or the like. Any material containing steel may be used.

Furthermore, in the above-described first to fourth embodiments, the coil 11 is wound around the outer circumference of the iron core 12. However, the winding method and shape of the coil 12 may vary depending on the principle of high-frequency induction heating. As long as the iron plate 40 can be heated, it may be different from the above-described first to fourth embodiments.

Furthermore, the present invention is not limited to the embodiments described above. That is, the scope of the present invention also extends to embodiments in which a part or all of the above-described embodiments are arbitrarily combined, or to embodiments in which a part is extracted.

INDUSTRIAL APPLICABILITY The present invention can be widely used as a method of manufacturing a permanent magnet rotor.

DESCRIPTION OF SYMBOLS 1... Rotating shaft, 2... Rotor, 3... Permanent magnet, 4... PG tape, 5, 10, 20, 30... Magnetic case, 6... Permanent magnet rotor, 10c... Recessed part, 40 …… Iron plate.

Claims (5)

A rotor manufactured in a cylindrical shape, a pre-magnetized permanent magnet adhered to the outer peripheral surface of the rotor so as to cover the outer peripheral surface of the rotor, and a thermosetting tape wound around the outer peripheral surface of the permanent magnet. and a magnetic case provided with an iron core in which a coil is wound around the inner periphery of a cylindrical member formed of a ferromagnetic material having an inner diameter larger than the outer diameter of the permanent magnet rotor . housed inside with a gap between the outer circumference of the permanent magnet rotor, the inner circumference of the cylindrical member, and the iron core ;
A method of manufacturing a permanent magnet rotor, wherein a high-frequency current is passed through the coils to heat the permanent magnets by the principle of high-frequency induction heating, thereby curing the thermosetting tape. A recess extending in the axial direction of the cylindrical member is formed in the inner circumference of the cylindrical member, and the magnetic case is provided with the iron core extending in the axial direction around which the coil is wound so as to be accommodated in the recess. housing the permanent magnet rotor inside so as to leave a gap between the outer periphery of the permanent magnet rotor, the inner periphery of the cylindrical member, and the iron core ;
While rotating the permanent magnet rotor around the rotation axis of the rotor, high-frequency current is passed through the coil to heat the permanent magnet by the principle of high-frequency induction heating, thereby hardening the thermosetting tape. Item 2. A method of manufacturing a permanent magnet rotor according to item 1. A plurality of iron cores extending in the axial direction of the cylindrical member around which the coils are wound are arranged inside the magnetic case arranged at regular intervals in the circumferential direction of the inner peripheral surface of the cylindrical member, and the permanent magnets are arranged inside the magnetic case. housing the permanent magnet rotor with a gap between the outer circumference of the rotor and the iron core ;
2. The method of manufacturing a permanent magnet rotor according to claim 1, wherein the thermosetting tape is hardened by applying a high-frequency current to the coil and heating the permanent magnet by the principle of high-frequency induction heating. The permanent magnet rotor, in which a plurality of the permanent magnets are arranged in the circumferential direction of the outer peripheral surface of the rotor, is arranged inside the cylindrical member in accordance with the arrangement of the permanent magnets. housed inside the magnetic material case arranged at regular intervals in the circumferential direction of the peripheral surface so as to leave a gap between the outer periphery of the permanent magnet rotor and the iron core ;
In a state in which each of the plurality of permanent magnets and each of the plurality of iron cores are opposed to each other, a high-frequency current is passed through the coil to heat the permanent magnets by the principle of high-frequency induction heating, thereby forming the thermosetting tape. The method of manufacturing a permanent magnet rotor according to claim 3, wherein the hardening is performed. The permanent magnet rotor, in which the outer side of the thermosetting tape is covered with a cylindrical covering member containing steel and having an outer diameter smaller than the inner diameter of the cylindrical member, is placed inside the magnetic case. Housed so that there is a gap between the outer circumference of the member and the inner circumference of the cylindrical member and the iron core ,
2. The method of manufacturing a permanent magnet rotor according to claim 1, wherein a high-frequency current is passed through the coil to heat the covering member by the principle of high-frequency induction heating, thereby curing the thermosetting tape through the covering member.

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