JP7344098B2 - Permanent magnet rotor manufacturing method and manufacturing device - Google Patents

Description

The present invention relates to a method and apparatus for manufacturing a permanent magnet rotor.

In recent years, magnets with high coercivity such as rare earth magnets (neodymium magnets, etc.) are sometimes used as permanent magnet rotors used in motors and the like. A magnet with high coercive force has the advantage of high heat resistance.

As a method for multipolar magnetizing the permanent magnets mounted on the permanent magnet rotor, for example, there is a method using a coil energization type magnetizing device. This magnetizing device has a hole in the center of the magnetizing yoke into which the rotor, which is the magnetized object, can be inserted and extracted, and a groove extending in the axial direction on the inner wall surface of the hole is used for magnetization. It is formed according to the number of poles. Further, conductive wires coated with an insulating film are buried in the groove, and adjacent conductive wires are continuous in a meandering manner to form a coil.
By inserting a magnetized object into such a hole and instantly releasing the charge stored in the capacitor, a pulse current is passed through the coil, and the magnetizing magnetic field generated in the magnetizing yoke by the pulse current causes the rotor to It is possible to magnetize the magnet mounted on the

However, since a high magnetizing magnetic field is required to magnetize a magnet with a high coercive force, the magnetizing device (magnetizing yoke) becomes larger and has the disadvantage of requiring high power for magnetization. It was happening. For example, a magnet with a small crystal grain size and a high coercive force may be able to achieve complete magnetization by being magnetized multiple times, for example, using the method described in Patent Document 1, but this requires high electric power. Moreover, a long time is required for magnetization.

If the magnetization becomes insufficient, irreversible demagnetization is likely to occur when the temperature rises, especially in rare earth magnets.
Therefore, as a method to saturate magnetize even a magnet with a high coercive force, a method has been proposed in which the object to be magnetized is heated to a high temperature and the magnetization field required for saturation magnetization is reduced. There is.

For example, in Patent Document 2, in magnetizing a magnetic component that includes a permanent magnet and a yoke made of a ferromagnetic material, the permanent magnet is placed in contact with a magnetic pole piece and is wound around the magnetic pole piece. A magnetizing device that magnetizes a magnetic pole piece or a yoke by induction heating it by flowing an alternating magnetic flux through the magnetic pole piece or yoke, and also cools the magnetic pole piece or yoke and the permanent magnet with a fluid. A permanent magnet magnetizing device is described, which is characterized in that it includes a means for magnetizing a permanent magnet. By equipping the magnetizer with an induction heating coil and a cooling means using a fluid, such a magnetizing device can heat and cool permanent magnet components in a short time, thereby achieving high performance. By magnetizing at high temperatures, it is not only possible to magnetize parts using permanent magnets with extremely high coercive force, such as neodymium-based rare earth magnets, but it is also possible to demagnetize the permanent magnet parts after they are removed from the magnetizer. It is also stated that this can be suppressed.

JP2016-63555A Japanese Unexamined Patent Publication No. 7-183124

However, in the magnetizing device described in Patent Document 2, when a permanent magnet component is cooled by a fluid, the magnetizer is also cooled at the same time. Taking into account that the temperature of permanent magnet parts will drop by heating the internal parts or inserting them into a magnetizer, it is necessary to heat the permanent magnet parts before magnetization more than necessary or to remove the magnetizing magnetic field. There will be a need to increase it. When heating a magnetizer or a permanent magnet component in this way, heating takes time and energy.

When magnetizing a permanent magnet component after heating it in this manner, it is preferable that the energy required for heating and magnetization be lower. Moreover, it is preferable that they be performed in a shorter time.

The present invention aims to solve the above problems.
That is, an object of the present invention is to provide a permanent magnet manufacturing method and manufacturing apparatus that can perform heating and magnetization in a shorter time and with lower energy.

The present inventor has made extensive studies to solve the above problems and has completed the present invention.
The present invention includes the following (1) to (6).
(1) A method for manufacturing a permanent magnet rotor, in which a permanent magnet rotor having a rotating shaft in the center of an iron core and having pre-magnetized magnets on the iron core is heated and then magnetized,
a heating step of heating the permanent magnet rotor to obtain a heated rotor;
a magnetizing step of magnetizing the heated permanent magnets included in the heated rotor to obtain a magnetized rotor including the magnetized permanent magnets;
a post-treatment step of passing the magnetized rotor through a path made of a soft magnetic material;
A method of manufacturing a permanent magnet rotor comprising:
(2) The method for manufacturing a permanent magnet rotor according to (1) above, wherein in the post-treatment step, the rotor is cooled after magnetization within the path.
(3) An apparatus for manufacturing a permanent magnet rotor, which heats and then magnetizes a permanent magnet rotor that has a rotating shaft in the center of an iron core and includes pre-magnetized magnets in the iron core,
a heating unit that heats the permanent magnet rotor to obtain a heated rotor;
a magnetizing unit that magnetizes the heated permanent magnets included in the heated rotor to obtain a magnetized rotor including the magnetized permanent magnets;
a post-processing section comprising a path made of a soft magnetic material through which the rotor can pass after magnetization;
A permanent magnet rotor manufacturing device having:
(4) The permanent magnet rotor manufacturing apparatus according to (3) above, wherein the rotor can be cooled after magnetization in the path provided in the post-processing section.
(5) Manufacture of the permanent magnet according to (3) or (4) above, wherein there is a cooling pipe outside the path or in a member constituting the path, and a cooling medium flows inside the cooling pipe. Device.
(6) having a conveyance path for conveying the magnetized rotor from the magnetization section to the post-processing section, and in the conveyance path, the magnetized rotor is transferred from the magnetization section to the post-processing section; The permanent magnet manufacturing apparatus according to any one of (3) to (5) above, which can be moved to a permanent magnet.

According to the present invention, it is possible to provide a permanent magnet manufacturing method and manufacturing apparatus that can perform heating and magnetization in a shorter time and with lower energy.

FIG. 2 is a schematic perspective view of a permanent magnet rotor. 1 is a schematic perspective view illustrating an example of an electromagnetic steel sheet that can be used to form a permanent magnet rotor. FIG. 2 is a schematic perspective view of a permanent magnet rotor (completed view). FIG. 2 is a schematic perspective view showing a specific example of a chucking jig. FIG. 3 is a schematic cross-sectional view showing a specific example of a pre-heating rotor with a jig. It is a schematic cross section showing a specific example of a heating section. FIG. 3 is a diagram showing a specific example of the relationship between the temperature of the magnet before magnetization, the effective magnetic field, and the magnetization rate. FIG. 4 is a diagram showing a specific example of the relationship X between temperature and magnetic field that allows complete magnetization to be obtained. FIG. 3 is a conceptual diagram for determining Tb. It is an illustration of a demagnetization curve. It is a schematic cross section showing a specific example of a magnetized part. It is a schematic cross section showing a specific example of a post-processing section. It is a schematic cross section showing another specific example of the post-processing section. It is a schematic cross section showing a specific example of a heating section, a magnetizing section, and a post-processing section.

The present invention will be explained.
The present invention is a method for manufacturing a permanent magnet rotor, in which a permanent magnet rotor having a rotating shaft in the center of an iron core and having pre-magnetized magnets on the iron core is heated and then magnetized. a heating step of heating a rotor to obtain a heated rotor; and magnetizing a heated permanent magnet included in the heated rotor to obtain a magnetized rotor including a magnetized permanent magnet. and a post-treatment step of passing the magnetized rotor through a path made of a soft magnetic material.
This method of manufacturing a permanent magnet rotor is also referred to below as the "manufacturing method of the present invention."

The present invention also provides an apparatus for manufacturing a permanent magnet rotor, which heats and then magnetizes a permanent magnet rotor that has a rotating shaft in the center of an iron core and includes pre-magnetized magnets in the iron core, a heating unit that heats a permanent magnet rotor to obtain a heated rotor; and a heating unit that magnetizes heated permanent magnets included in the heated rotor to obtain a magnetized rotor that includes magnetized permanent magnets. The present invention is an apparatus for manufacturing a permanent magnet rotor, which includes a magnetization section and a post-processing section including a path made of a soft magnetic material through which the rotor can pass after magnetization.
Such a permanent magnet rotor manufacturing apparatus is also referred to below as a "manufacturing apparatus of the present invention".

In the following, when simply writing "the present invention", it shall mean both the manufacturing method of the present invention and the manufacturing apparatus of the present invention.

<Permanent magnet rotor>
First, the permanent magnet rotor to be heated and magnetized in the present invention will be explained using the drawings.
A permanent magnet rotor 1 (hereinafter also referred to as "rotor 1") that is to be heated and magnetized in the present invention has a rotating shaft 12 at the center of an iron core 10, as shown in FIG. A slot 14 is provided on the outer circumferential side of the rotating shaft 12 at 10, and a pre-magnetized magnet 3 is further provided within the slot 14.
The permanent magnet rotor in the present invention may have slots as shown in FIG. 1, or may have no slots.

A hole 11 is formed in the center of the iron core 10 for passing the rotating shaft 12 therethrough, and the rotating shaft 12 passed through the hole 11 is fixed to the iron core 10.

For example, as shown in FIG. 2, the iron core 10 can be formed by laminating a plurality of electromagnetic steel plates 5 punched into a predetermined shape (circular, etc.) and fixing the main surfaces of each. The electromagnetic steel plate 5 may have a thickness of about 350 μm, for example.
In addition to the electromagnetic steel sheet 5, the iron core 10 can also be formed by, for example, laminating a plurality of soft magnetic sheets and fixing the main surfaces of each sheet.

The iron core 10 has slots 14 provided on the outer circumferential side of the central shaft 12 at approximately equal intervals in the circumferential direction and corresponding to the number of poles. The core illustrated in FIG. 1 has four slots 14.
The slot 14 is a hole into which the pre-magnetized magnet 3 is inserted, and is formed so that the direction parallel to the axial direction of the rotating shaft 12 is the depth direction.

Then, the pre-magnetized magnet 3 is inserted into each of the slots 14. In the case of the embodiment illustrated in FIG. 1, four pre-magnetized magnets 3 are arranged inside each of the four slots 14.
After inserting the pre-magnetized magnet 3 into the slot 14, as shown in FIG. An end plate 16 is attached to prevent the front magnet 3 from coming off in a direction parallel to the rotating shaft 12.

The thickness of the magnet 3 before magnetization must be smaller than the width of the slot 14, but it must not be too small. It must be determined appropriately in consideration of the machining accuracy of the magnet 3 before magnetization and the slot 14.
As the magnet 3 before magnetization, a neodymium magnet such as a PLP sintered magnet manufactured by Daido Electronics Co., Ltd. or an MQ3 hot rolled magnet before magnetization can be used.

Further, the pre-magnetized magnet 3 may be a neodymium magnet made of fine crystal grains with an average crystal grain size of 0.1 to 3.5 μm (preferably 0.3 to 3.0 μm).
A magnet with such a small average crystal grain size has the advantage of high coercive force and high heat resistance. However, the smaller the average crystal grain size, the higher the magnetic field required to achieve complete magnetization. Also, the higher the magnet temperature, the lower it will be to achieve complete magnetization.

In the present invention, the permanent magnet rotor as described above may be held by a chucking jig and subjected to heating and/or magnetization as described below.
The chucking jig is a jig that holds both ends of the rotating shaft, and when both ends of the rotating shaft are held by the chucking jig, the chucking jig and the permanent magnet rotor have a rod shape as a whole. In the present invention, a rod-shaped permanent magnet rotor whose rotating shaft is held by a chucking jig before heating is also referred to as a pre-heated rotor with a jig.

In the present invention, both ends of the rotating shaft refer to portions of the rotating shaft that are not included in the iron core.

Further, it is preferable that at least a portion of the chucking jig that contacts both ends of the rotating shaft is made of a heat insulating material. In this case, since heat conduction from the rotor to the chucking jig is difficult to occur, when the pre-heating rotor with the jig is heated, the temperature of the pre-magnetized magnets is efficiently raised. If thermal conduction is likely to occur from the rotor to the chucking jig, even if the pre-heated rotor with the jig is heated, the energy will be difficult to use to raise the temperature of the pre-magnetized magnets, resulting in poor efficiency. .
Examples of the heat insulating material used for at least the portion of the chucking jig that contacts both ends of the rotating shaft include TC board (unsaturated polyester resin), PEEK material (polyether ether ketone resin), and glass epoxy (150° C.).

A chucking jig and a pre-heating rotor with a rod-shaped jig will be described with specific examples shown in FIGS. 4 and 5. FIG.
FIG. 4 shows a specific example (schematic perspective view) of the chucking jig, and FIG. 5 shows a state in which the chucking jig shown in FIG. 4 is attached to the rotor 1, that is, before heating with the jig. A specific example (schematic cross-sectional view) of a rotor is shown.

In FIG. 4, the chucking jig 20 is a cylindrical member made of a heat insulating material, and its cross-sectional diameter (outer diameter) is adjusted to be approximately the same as the outer diameter of the iron core 10. Further, the chucking jig 20 has a hole 22 on one end surface 21 for holding the rotating shaft 12 of the rotor 1.
The cross-sectional diameter of the hole 22 is formed to be approximately the same as the cross-sectional diameter of the rotating shaft 12. If the portion of the chucking jig 20 in which the hole 22 is formed has elasticity, the cross-sectional diameter of the hole 22 may be formed to be slightly smaller than the cross-sectional diameter of the rotating shaft 12; in this case, the chucking jig Both ends of the rotating shaft 12 can be firmly held by the tool 20.

Two such chucking jigs 20 are prepared, and the rotating shaft 12 is held by inserting the rotating shaft 12 into the hole 22 of each chucking jig 20, and the rotating shaft 12 is held before heating with a rod-shaped jig as shown in FIG. Child 25 can be obtained.

<Heating section, heating process>
In the present invention, a permanent magnet rotor (or a pre-heating rotor with a jig) as described above is placed inside a heating section and heated.
The heating section may be of any type as long as it can heat the permanent magnet rotor (or the pre-heating rotor with a jig) therein.

The heating section will be explained by showing a specific example in FIG. FIG. 6 is a schematic cross section showing a specific example of a heating section that heats the pre-heating rotor 25 with a jig.
In FIG. 6, the heating section 30 can heat the jig-equipped pre-heating rotor 25 in a state in which the rotating shaft 12 thereof is disposed horizontally.

Here, after the heating unit 30 is inserted into the insertion hole 32 from one end 27 of the pre-heating rotor 25 with a jig, the pre-heating rotor 25 with a jig is held in a state where the rotating shaft 12 is held horizontally. After heating, it can be discharged from the discharge hole 34 so that the one end 27 of the unheated rotor 25 with the jig is in front.
Specifically, for example, the heating unit 30 has a tunnel-like path, the jig-equipped pre-heat rotor 25 is transported within the path, and the jig-equipped pre-heat rotor 25 is transported along the path. It is preferable that the material be heated, then further conveyed through a path, and then discharged from the discharge hole 34 of the heating section 30.
Here, the jig-equipped pre-heat rotor 25 is heated by the heating unit 30 and is discharged from the discharge hole 34 as the jig-equipped post-heat rotor 35 .
In such a mode, since the direction of the rotating shaft 12 of the rotor 1 and the conveying direction when heating the rotor 1 match, the conveying efficiency during heating can be improved.

In the present invention, the rotor as described above (or the rotor before heating with a jig) is heated at a temperature above a specific temperature (Ta°C) at which complete magnetization is obtained and below a certain temperature at which irreversible demagnetization occurs (Tb°C). It is preferable to heat within this range.

Here, the specific temperature (Ta°C) can be determined as follows.
First, the relationship X between the temperature and effective magnetic field at which complete magnetization can be obtained in the magnet before magnetization is obtained.
A method for obtaining such a relationship X will be explained using a specific example.
A permanent magnet taken from the same production lot as the permanent magnet to be inserted into the slot of the permanent magnet rotor is processed into a size determined by a magnetic property measuring device, for example, a 7 mm cube.
Next, using a pulse BH measurement device (PBH-1000) manufactured by Nippon Denshi Sokki Co., Ltd., etc., various maximum measurement magnetic fields (for example, maximum measurement magnetic fields of 0.5T, 1T, 2T, 5T, 8T) to obtain magnetization-magnetic field curves (JH curves). A BH curve is obtained from the JH curve for each maximum measured magnetic field (B=J+μ ₀ H). The coercive force _b H _c can be determined from the intersection of the second quadrant (so-called demagnetization curve) of this BH curve and the horizontal axis (magnetic field axis). When _b H _c at a maximum magnetic field of 5T or more is ( _b H _c ) _max , the value obtained by dividing _b H _c at each maximum measured magnetic field by ( _b H _c ) _max (= _b H _c / ( _b H _c ) _max ) is defined as the magnetization rate at its maximum measured magnetic field at room temperature.
Following room temperature, similar measurements are performed at high temperatures such as 70° C., 100° C., and 150° C., and the magnetization rate at each maximum measured magnetic field at each temperature is determined.
Note that in the above description, the "magnetic field" refers to the so-called "effective magnetic field" that effectively traverses the inside of the magnet.

When the relationship between the temperature of the magnet before magnetization, the effective magnetic field, and the magnetization rate is determined in this way, for example, FIG. 7(a) is obtained. Note that FIG. 7(b) is a partially enlarged view of FIG. 7(a).
Then, the values of the temperature and effective magnetic field of the pre-magnetized magnet at which complete magnetization (magnetization rate is 0.98 or more) are read from FIG. 7(b). Specifically, in FIG. 7(b), the temperature of the magnet before magnetization is 150°C, 100°C, 70°C, R. T. The effective magnetic field at points P ₁ , P ₂ , P ₃ , and P ₄ is read, which means complete magnetization when . Then, FIG. 8 is created from these values. FIG. 8 is a diagram showing the relationship X between the temperature at which complete magnetization is obtained in the magnet before magnetization and the effective magnetic field. In some cases, the relationship X can be expressed by a formula.
Then, if the magnetic field (effective magnetic field (kOe)) for magnetizing after heating is determined, the temperature at which complete magnetization can be obtained can be determined from the relationship X using it.
The temperature at which this complete magnetization is obtained is a specific temperature (Ta°C), and the rotor (or the rotor before heating with a jig) is ) is preferably heated.

In the heating step, it is preferable to heat the rotor to a specific temperature (Ta° C.) as described above and below a specific temperature (Tb° C.) at which irreversible demagnetization occurs.

Here, the specific temperature (Tb°C) is the BH curve obtained from the JH curve (magnetization curve) of a permanent magnet cut from a product of the same production lot as the permanent magnet loaded in the slot measured when determining the relationship X. The bending point (knick point) on the second quadrant (demagnetization curve) can be determined by determining the temperature at which the operating line (Pc line) of the permanent magnet in the rotor crosses. That is, the specific temperature (Tb° C.) means a temperature at which the operating point does not fall below the bending point in the second quadrant of the BH curve. Therefore, the larger the permeance coefficient, the higher the specific temperature (Tb° C.).
FIG. 9 shows a conceptual diagram for determining Tb, and FIG. 10 shows an example of the demagnetization curve of the JH curve and BH curve of an actual permanent magnet. It can be seen that for a certain Pc, Tb is 160°C.

As described above, in the magnetization step of the present invention, the rotor is heated within a range of a specific temperature (Ta°C) at which complete magnetization is obtained and a specific temperature (Tb°C) at which irreversible demagnetization occurs. , obtain a permanent magnet after heating.

It is preferable that the heating process as described above also serves as a heating process required in a general shrink-fitting process or resin encapsulation process in the assembly process of a permanent magnet rotor.

<Magnetization part, magnetization process>
In the present invention, the heated rotor (or heated rotor with jig) obtained by heating as described above is magnetized.

Such a magnetized portion and a magnetized method will be explained using FIG. 11. FIG. 11 is a schematic cross-sectional view showing a specific example of a magnetizing section that magnetizes a heated rotor with a jig.
In FIG. 11, the magnetized section 40 is arranged so that the direction of the device axis is horizontal.
For example, the magnetizing yoke 44 of the magnetizing unit 40 has a tunnel-like path, and after inserting the jig-equipped heated rotor 35 into the insertion hole 43 from its one end 37, the rotating shaft 12 is held horizontally, and the rotor 35 with a jig after heating is magnetized with the parts in contact with both ends of the rotating shaft 12 fixed at a specific position with at least a fixing jig made of a heat insulating material. . Then, after being magnetized, it can be discharged from the discharge hole 46 with the one end 37 leading.
Here, the jig-equipped heated rotor 35 is magnetized by the magnetizing section 40 and is discharged from the discharge hole 46 as the jig-equipped magnetized rotor 48 .

Further, the jig-equipped heated rotor 35 may be fixed in a predetermined position by another jig (fixing jig) different from the chucking jig 20, and the chucking jig 20 itself may be fixed at a predetermined position. It can also be used as In this case, by fixing the chucking jig 20 at a desired position, the jig-equipped heated rotor 35 can also be fixed at a desired position.

In such an embodiment, since the direction of the rotating shaft 12 of the rotor 1 and the conveyance direction (horizontal direction in the figure) when heating the rotor 1 match, not only heating but also Conveyance efficiency during magnetization can also be improved.

Furthermore, in the case of the embodiment shown in FIG. 11, the path for transporting the pre-heated rotor 25 with a jig inside the heating section 30 and the path for transporting the heated rotor 35 with a jig inside the magnetization section 40 are different. Since they are connected and form a single straight path, the transport efficiency can be extremely high.
Here, it is preferable that the residence time of the jig-equipped pre-heat rotor 25 in the heating section 30 and the residence time of the jig-equipped post-heat rotor 35 in the magnetization section 40 be approximately the same, since the conveyance efficiency will further increase.

<Post-processing section, post-processing process>
The magnetized rotor obtained as described above (or the magnetized rotor with a jig) is passed through a path made of a soft magnetic material provided in the post-processing section. The post-processing section is a portion different from the magnetization section.

Conventionally, after a heated magnet is magnetized in a magnetizing section, it is cooled inside the magnetizing section to prevent demagnetization.
However, in this case, cooling takes time. The temperature inside the magnetized part will drop, so the temperature of the heated rotor (or the heated rotor with jig) can be lowered by heating the inside of the magnetizer the next time it is used, or by inserting it into the magnetizer. In consideration of this, it was necessary to increase the temperature of the rotor after heating more than necessary, or to increase the magnetizing magnetic field. In this case, since it takes time to heat these, process time loss and energy loss occur.
Therefore, in the present invention, the magnetized magnet (post-magnetized rotor) magnetized in the magnetization section is moved to the post-processing section without being cooled. In this case, the magnetizing section can be used for magnetizing the next magnet. In addition, since the magnet after magnetization can be cooled in the post-processing section, the cooling time is shortened and the temperature inside the magnetized section is less likely to drop, so the inside of the magnetized section is re-cooled for next use. There is no need to heat the rotor, or even if it is reheated, only a small amount is required, or there is no need to increase the temperature of the rotor more than necessary after heating. Therefore, process time loss and energy loss are less likely to occur.

In the present invention, since the path through which the magnetized rotor (or the magnetized rotor with jig) passes is made of a soft magnetic material, the magnetized permanent magnets are difficult to demagnetize.
Here, the soft magnetic material has a relative magnetic permeability of 1.0 or more, preferably 10 or more.
An example of such a soft magnetic material is iron.

It is preferable that the gap between the inner surface of the path made of soft magnetic material provided in the post-processing section and the magnetized rotor (or the magnetized rotor with a jig) passed through it be as small as possible. The gap is preferably 1 mm or less, more preferably 0.75 mm or less. This is because the smaller this gap is, the more difficult it is to demagnetize.

Note that the gap between the inner surface of the path and the magnetized rotor passing through it is the average value of the distance between the inner surface of the path and the magnetized rotor in a cross section perpendicular to the direction of passage of the magnetized rotor. shall mean.

The total length of the path made of soft magnetic material included in the post-processing section is not particularly limited, but may be, for example, 50 to 200 mm.

Further, it is preferable that a cooling pipe is provided outside the path or in a member constituting the path, and that a cooling medium flows inside the cooling pipe.
For example, FIG. 12 is a schematic cross-sectional view showing a state in which the cooling pipe 54 is wound around the outside of the path 52, and FIG. FIG.
Preferably, a cooling medium flows within the cooling pipe. In this case, the magnetized rotor (or the magnetized rotor with a jig) in the path can be efficiently cooled.
Examples of the coolant include water, oil, and air.

Here, as shown in FIGS. 12 and 13, the path 52 provided in the post-processing section has an insertion hole 56 for inserting the magnetized rotor 48 with a jig therein, and an insertion hole 56 for inserting the magnetized rotor 48 with a jig therein, and a Preferably, a discharge hole 58 is formed to discharge the fluid to the outside. In this case, after magnetization with a jig, the rotor 48 is inserted into the insertion hole 56 from one end 49 (end face of the chucking jig), cooled by moving it horizontally, and then From there, it can be discharged so that its one end 49 is in the lead.

It is preferable that the post-processing section in the embodiment illustrated in FIGS. 12 and 13 is connected to the magnetization section and heating section in the embodiment illustrated in FIG. 11. Such an aspect is illustrated in FIG.
In the case of the embodiment shown in FIG. 14, there is a path for transporting the jig-equipped unheated rotor 25 inside the heating unit 30, a route for transporting the jig-equipped post-heat rotor 35 inside the magnetizing unit 40, and Since the path for transporting the magnetized rotor 48 with the jig in the processing section 50 is connected to form one straight path, the transport efficiency can be extremely high.

In the embodiment illustrated in FIG. 14, when the magnetized section 40 and the post-processing section 50 are connected via the heat insulating material 60, heat transfer from the magnetizing section 40 to the post-processing section 50 is small. The rotor can be cooled even if the path 52 in 50 is shortened.
On the other hand, if no heat insulating material is placed between the magnetized section 40 and the post-processing section 50, heat transfer occurs from the magnetized section 40 to the post-processing section 50, so the post-processing section 50 cools the magnetized section 40. be able to. However, in this case, it becomes relatively difficult to cool the rotor, so it is necessary to make the path 52 in the post-processing section 50 relatively long.

1 Rotor 3 Magnet before magnetization 5 Electromagnetic steel plate 10 Iron core 11 Hole 12 Rotating shaft 14 Slot 16 End plate 20 Chucking jig 22 Hole 25 Pre-heating rotor with jig 27 One end of the pre-heating rotor with jig 30 Heating section 32 Insertion hole 34 Discharge hole 35 Rotor after heating with jig 37 One end of rotor after heating with jig 40 Magnetizing section 43 Insertion hole 44 Magnetizing yoke 46 Discharge hole 48 After magnetization with jig Rotor 49 One end of the rotor after magnetization with jig 50 Post-processing section 52 Path 54 Cooling pipe 56 Insertion hole 58 Discharge hole

Claims (6)

An apparatus for manufacturing a permanent magnet rotor, which heats and then magnetizes a permanent magnet rotor that has a rotating shaft in the center of an iron core and includes pre-magnetized magnets in the iron core,
a heating unit having a conveyance path and heating the permanent magnet rotor within the conveyance path to obtain a heated rotor;
a magnetizing unit that has a conveyance path and magnetizes the heated permanent magnets included in the heated rotor in the conveyance path to obtain a magnetized rotor including the magnetized permanent magnets;
a post-processing section comprising a path made of a soft magnetic material through which the rotor can pass after magnetization;
The conveying path of the heating section, the conveying path of the magnetizing section, and the path of the post-processing section are connected to form one straight path. Permanent magnet rotor manufacturing equipment. The permanent magnet rotor manufacturing apparatus according to claim 1, wherein the magnetized rotor can be cooled in the path provided in the post-processing section. 3. The permanent magnet rotor manufacturing apparatus according to claim 1 , wherein a cooling pipe is provided outside the path or in a member constituting the path, and a cooling medium flows inside the cooling pipe. It has a conveyance path for conveying the magnetized rotor from the magnetization section to the post-processing section, and moves the magnetized rotor from the magnetization section to the post-processing section within the conveyance path. The permanent magnet rotor manufacturing apparatus according to any one of claims 1 to 3 , which is capable of manufacturing a permanent magnet rotor. A method for manufacturing a permanent magnet rotor, which comprises heating and then magnetizing a permanent magnet rotor that has a rotating shaft in the center of an iron core and has pre-magnetized magnets on the iron core, the method comprising:
a heating step of heating the permanent magnet rotor to obtain a heated rotor;
a magnetizing step of magnetizing the heated permanent magnets included in the heated rotor to obtain a magnetized rotor including the magnetized permanent magnets;
a post-treatment step of passing the magnetized rotor through a path made of a soft magnetic material;
A method for manufacturing a permanent magnet rotor, comprising: using the permanent magnet rotor manufacturing apparatus according to any one of claims 1 to 4 . In the post-treatment step,
The method for manufacturing a permanent magnet rotor according to claim 5 , wherein the rotor is cooled after being magnetized in the path.

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