JP2013183537A - Rotor of permanent magnet type motor, and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor capable of achieving rustproof processing of a permanent magnet and increase in adhesive force to a shaft by reducing an air gap between the shaft and the permanent magnet, in a permanent magnet type motor for a surface magnet type rotor.SOLUTION: In a rotor 1 of a permanent magnet type motor in which a permanent magnet 3 is provided on an outer diameter surface 2a of a shaft 2, an opposed surface 3a opposed to the shaft 2, of the permanent magnet 3 has a predetermined curvature Rm. A coating film 5 is infiltrated and adhered to a gap between the opposed surface 3a and the outer diameter surface 2a of the shaft 2 to fix the shaft 2 and the permanent magnet 3 with each other.

Description

  The present invention relates to a rotor in which a permanent magnet and a shaft are integrally fixed in a rotor of a permanent magnet motor, and a method for manufacturing the rotor.

Permanent magnet motors are widely used in the field of FA (factory automation) and home appliances because they can achieve high operating efficiency.
This permanent magnet motor includes a stator and a rotor, and there are rotors using a surface magnet type rotor in which a permanent magnet is provided on the rotor surface and a magnet embedded type rotor in which a permanent magnet is embedded in the rotor.
The magnet-embedded rotor has an effective structure for preventing the permanent magnet from scattering during high-speed rotation. However, since the permanent magnet is embedded in the rotor (shaft), the distance between the stator and the permanent magnet, that is, the air gap Increases, and the magnetic flux density decreases, so that the motor characteristics are inferior to those of the surface magnet type rotor.
On the other hand, since the surface magnet type rotor can reduce the distance (gap) between the magnet and the stator inner diameter, a motor with higher characteristics can be obtained compared to the magnet embedded type rotor. Anti-scattering measures are more important.
The structure of the surface magnet type rotor is composed of a substantially tile-shaped magnet divided into magnetic poles on the shaft, and a ring-shaped magnet magnetized for each magnetic pole. The prevention of scattering of the magnets is achieved.
As the fixing structure, a narrow circumferential protrusion having an outer peripheral surface concentric with the shaft is provided in the vicinity of both ends of the outer peripheral portion of the yoke, and a permanent magnet is fitted to face the circumferential protrusion. In this case, an adhesive filled with an adhesive having a large expansion / contraction ratio after adhesive curing is shown (for example, Patent Document 1).

Japanese Patent No. 3398977

However, the technique disclosed in Patent Document 1 has a large gap between the yoke (shaft) and the permanent magnet, which causes a relatively large magnetic resistance, and has a problem with respect to the demand for smaller and higher performance motors. is there. Further, although not explicitly disclosed in the above-mentioned Patent Document 1, generally, since the permanent magnet is preliminarily subjected to a rust-proof coating treatment, the gap between the yoke and the permanent magnet is formed with a rust-proof coating and an adhesive. There is also a problem in that the substantial gap in the magnetic circuit between the yoke and the permanent magnet becomes large, which becomes a hindrance to the improvement of the yoke characteristics accompanying the increase in the magnetic resistance.
In addition, if a permanent magnet has been subjected to a rust-proof coating treatment in advance, the rust-proof coating film may be peeled off when the permanent magnet is fixed to the shaft or when the permanent magnet is transported. There is a problem that it is necessary to pay attention to the permanent magnet gripping by manpower and automatic machines, which causes a high cost because it is necessary to receive a magnet.

  The present invention has been made to solve the above-described problems. In the permanent magnet motor of the surface magnet type rotor, the gap between the shaft and the permanent magnet is reduced, the antirust treatment of the permanent magnet and the shaft are applied. By providing an adhesive structure, a rotor having a shaft and a permanent magnet firmly fixed to each other and improved in magnetic properties is provided.

  In the rotor of the permanent magnet motor according to the first aspect of the present invention, a predetermined curvature is provided on a surface of the permanent magnet facing the outer diameter surface of the shaft, and the outer diameter surface of the shaft and the facing surface of the permanent magnet are provided. Only the coating film covering the permanent magnet permeates into the gap between the shaft and the shaft and the permanent magnet is fixed.

The method for manufacturing a rotor of a permanent magnet motor according to the second invention includes the following steps.
Step 1. A step of preparing a plurality of permanent magnets which are divided into shafts and magnetic poles, are substantially tile-shaped, have a predetermined curvature on the surface facing the shaft, and are unpainted and magnetized.
Step 2. A step of holding and arranging a plurality of magnets by magnetic force in a predetermined magnetic order at equal intervals in the outer circumferential direction on a fixed portion of the axial magnet on the outer diameter surface of the shaft.
Step 3. A step of attaching a hanger to one end of the shaft, inserting the hanger into a coating tank containing a liquid coating film material, applying electrodeposition coating to the shaft and the permanent magnet, and infiltrating the coating film into the gap between the shaft and the permanent magnet.
Step 4. A step of curing the coating film to form a rotor in which the shaft and the permanent magnet are fixed.

A method for manufacturing a rotor of a permanent magnet motor according to a third aspect of the present invention includes the following steps.
Step 1. The shaft is divided into magnetic poles, is substantially tile-shaped, has a predetermined curvature on the surface facing the shaft, has a notch groove extending in the axial direction on the facing surface, and is unpainted and non-magnetized. Preparing a plurality of permanent magnets and a positioning jig;
Step 2. Fixing a positioning jig at one end of the shaft at a predetermined position;
Step 3. Disposing a plurality of permanent magnets on a positioning jig, and disposing the permanent magnets at equal intervals in the circumferential direction at a fixed portion of a magnet in a predetermined axial direction on the outer diameter surface of the shaft;
Step 4. A hanger is attached to the other end of the shaft, inserted into a coating tank containing liquid coating film material, electrodeposition is applied to the permanent magnet, and the coating film is formed in the notch groove and in the gap between the shaft and the permanent magnet. Infiltrate the step.
Step 5. The step of curing the coating film and fixing the shaft and the permanent magnet.
Step 6. Removing the positioning jig from the shaft;
Step 7. A step of forming a rotor by magnetizing a permanent magnet so as to have a predetermined polarity.

The method of manufacturing a rotor of a permanent magnet motor according to the fourth invention includes the following steps.
Step 1. A step of preparing a cylindrical shaft that is magnetized to have a predetermined polarity in the circumferential direction and that is provided with an unpainted permanent magnet and a plurality of notch grooves in the axial direction.
Step 2. A step of holding and arranging a permanent magnet by a magnetic force on a fixed portion of a magnet in a predetermined axial direction on the outer diameter surface of the shaft.
Step 3. Attach a hanger to one end of the shaft, insert it into the coating tank containing the liquid coating film material, apply electrodeposition coating to the shaft and permanent magnet, and apply the coating film in the notch groove and in the gap between the shaft and permanent magnet. Infiltration step.
Step 4. A step of curing the coating film to form a rotor in which the shaft and the permanent magnet are fixed.

Since the rotor of the permanent magnet motor according to the first invention has the above-described configuration, the gap (gap) between the shaft and the permanent magnet is small, and as a result, the magnetic resistance in the gap is reduced. There is an effect that it is possible to obtain a rotor having improved magnetic characteristics and improved adhesion between the shaft and the permanent magnet. In addition, since an unpainted magnet is used, there is an effect that the amount of raw materials can be reduced and an extra process required for painting can be reduced.
In addition, since the rotor of the permanent magnet motor according to the second to fourth inventions is manufactured by the manufacturing method as described above, it is coated by electrodeposition in the gap (gap) or notch groove between the shaft and the permanent magnet. Since the liquid penetrates and cures, in addition to the effect of the first invention, it does not require a rust-proof coating treatment when a permanent magnet is used alone, and compared with work that handles a permanent magnet that has been subjected to rust-proof coating treatment. In addition, there is no need for considerations such as prevention of omission of rust-proof coating, and as a result, workability is improved.

1 is a conceptual outline diagram showing a rotor according to Embodiment 1. FIG. It is an enlarged view which shows the state which attached the permanent magnet to the shaft by Embodiment 1. FIG. FIG. 3 is a conceptual diagram showing a notch groove provided in a shaft according to the first embodiment. FIG. 3 is a conceptual diagram showing a notch groove provided in a shaft according to the first embodiment. FIG. 3 is a conceptual diagram showing a notch groove provided in a shaft according to the first embodiment. FIG. 3 is a conceptual diagram showing a notch groove provided in the permanent magnet according to the first embodiment. FIG. 4 is a diagram illustrating a rotor painting operation according to the first embodiment. FIG. 3 is a conceptual diagram showing a permanent magnet positioning jig according to Embodiment 1; It is a conceptual diagram which shows the rotor by Embodiment 2. FIG. 6 is a conceptual diagram showing a notch groove provided in a permanent magnet according to Embodiment 2. FIG. FIG. 10 is a diagram illustrating a rotor painting operation according to a second embodiment. FIG. 5 is a conceptual diagram showing a permanent magnet positioning jig according to a second embodiment.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a conceptual diagram showing a rotor 1 of a permanent magnet motor according to Embodiment 1 of the present invention.
As shown in FIG. 1, the rotor 1 has a magnet fixing portion 4 in which a shaft 2 and a substantially tile-shaped permanent magnet (hereinafter abbreviated as a magnet) 3 divided into a predetermined number of magnetic poles are at predetermined positions of the shaft 2. Are evenly arranged in the circumferential direction. A coating film 5 is provided on the surfaces of the magnet 3 and the shaft 2. Details thereof will be described later.
The AA cross section of FIG. 1 is shown in FIG. In addition, although the example which provided the magnet 3 was shown, the number should just be 2n (n = 1 or more) pieces. The magnet 3 is generally shipped with a rust-proof coating treatment by a magnet manufacturer, but the magnet 3 applied to all the embodiments of the present invention is subjected to the rust-proof coating. The one that is not used is used. The magnet 3 may be magnetized or not magnetized by the manufacturer. In the first example of the first embodiment, the case of the magnet 3 that is magnetized will be described. FIG. 2 is an enlarged view of one magnet 3 fixed to the shaft 2. As shown in FIG. 2, the shaft 2 is between a shaft radius Rs that is ½ of the diameter and a predetermined curvature Rm provided on the facing surface 3 a of the magnet 3 that faces the outer diameter surface 2 a of the shaft 2. A minute gap G is provided. That is, FIG. 2A shows Rm> Rs, the gap G is provided at the end 3b in the width direction of the magnet 3, and FIG. 2B shows Rm <Rs, and the width of the magnet 3 in the width direction. The gap G is provided in the central portion 3c. Here, the curvature Rm of the facing surface 3a of the magnet 3 is determined so that the gap G is about 0.1 mm at the maximum.
As shown in FIGS. 2A and 2B, when the magnet 3 is provided on the outer diameter surface 2a of the shaft 2 and the coating film 5 of the rotor 1 is applied by the manufacturing method described later, the outer diameter of the shaft The coating film 5 penetrates into the gap G between the surface 2a and the facing surface 3a of the magnet 3 opposed thereto, and the coating film 5 is heated and cured in this state, whereby the permanent magnet 3 is firmly fixed to the shaft 2. The

In order to obtain a sufficient fixing force between the shaft 2 and the magnet 3, there are configurations as shown in FIGS. That is, as shown in FIGS. 3A and 3B, a notch groove 8 extending in the axial direction of the shaft 2 is provided in the fixing portion 4 of the magnet 3 at a predetermined position of the shaft 2. In addition, description of the magnet 3 is abbreviate | omitted in Fig.3 (a). In this example, six notch grooves 8 are provided on the shaft 2 facing the central portion 3 c in the width direction of the magnet 3. On the other hand, in order to obtain a stronger fixing force, as shown in FIGS. 4 (a) and 4 (b), a notch groove 8 is formed in the shaft 2 facing the vicinity of the end 3b in the width direction of the magnet 3. Two magnets may be provided for each magnet 3, or two or more magnets may be provided. In FIG. 4A, the description of the magnet 3 is omitted.
Further, as shown in FIG. 5, a notch groove 8 may be provided in the circumferential direction of the shaft 2 in the fixing portion 4 of the magnet 3 of the shaft 2. In addition, although the example which provides the two notch grooves 8 was shown in FIG. 5, two or more plural may be sufficient.

  In order to further increase the fixing force, a notch groove 8a may be provided in the facing surface 3a of the magnet 3 as shown in FIG. In FIG. 6, one notch groove 8 a is provided for each magnet 3, but a plurality of two or more may be used.

  The notch groove 8 provided in the shaft 2 and the notch groove 8a provided in the magnet 3 have a rectangular shape, but may be semicircular or V-shaped, and the cross-sectional shape is particularly specified. is not. By providing such notched grooves 8 and 8a, a passage through which the coating film 5 permeates is secured, the amount of the coating film 5 entering the gap G is increased, and the fixing force between the shaft 2 and the magnet 3 is increased. To increase.

Next, a method for manufacturing the rotor 1 according to the first example of the first embodiment will be described in the order of steps based on FIG. This manufacturing method is the case of the magnet 3 and the shaft 2 in FIG. 2A or FIG. 2B, and the shaft 2 is not provided with the notch groove 8 described above. Even in the case of the shaft 2 having the notch groove 8 and the magnet 3 having the notch groove 8a described above, the same manufacturing method as the steps shown below can be employed.
Step 1. As shown in FIG. 7 (a), a shaft 3 and a magnet 3 which is divided for each magnetic pole and has a predetermined curvature Rm on a surface 3a facing the shaft 2 in a substantially tile shape, unpainted and magnetized. Step to prepare 6 pieces.
Step 2. A step of holding and arranging the six magnets 3 by magnetic force at equal intervals in the outer peripheral direction on the outer diameter surface 2a of the shaft 2 and on the fixed portion 4 of the magnet 3 in the axial direction.
Step 3. As shown in FIG. 7B, a hanger 9 is attached to one end of the shaft 2, inserted into a coating tank 10 containing the material of the liquid coating film 5, and the shaft 2 and the magnet 3 are subjected to electrodeposition coating. A step of penetrating the coating film 5 into the gap 6 between the magnet 2 and the magnet 3;
Step 4. As shown in FIG. 7 (c), a step of inserting into a constant temperature furnace 11 or a drying furnace, curing the coating film 5, and forming the rotor 1 in which the shaft 2 and the magnet 3 are fixed.
In the rotor 1 manufactured by the steps 1 to 4 as described above, only the coating film 5 penetrates into the gap G between the shaft 2 and the magnet 3, and the shaft 2 and the magnet 3 are fixed. Compared with the case where a magnet is coated with a rust preventive coating as in the case of a technology and the shaft and the magnet are fixed, the fixing force between the shaft 2 and the magnet 3 is increased. A permanent magnet motor having the rotor 1 with a narrow gap and improved magnetic properties can be obtained. In addition, after the magnet is manufactured by the magnet manufacturer, it is not necessary to apply a rust preventive coating, thus saving energy. In this example of the manufacturing method, the number of magnets 3 is six, but the number may be 2n (n = 1 or more).

Next, Example 2 according to the first embodiment will be described. In the above-described first embodiment, the magnet 3 is magnetized. In the second embodiment, the method of manufacturing the rotor 1 using the non-magnetized magnet 3 is based on the steps in order, as shown in FIGS. I will explain. This manufacturing method is described in the case where the magnet 3 shown in FIG. 2A or FIG. 2B is the same as that in the first embodiment and the shaft 2 is not provided with the notch groove 8.
The second embodiment is characterized in that the positioning jig 12 for the magnet 3 is used. The positioning jig 12 will be described. As shown in FIG. 8, the positioning jig 12 has a ring shape and is provided with a plurality of projections 12a extending in the axial direction, in this case, six projections 12a. Since the circumferential end surface of the projection 12a holds the magnet 3 on the shaft 2 with high accuracy in the circumferential direction, the projection 12a has a shape along the shape of the end surface of the magnet 3 and the interval between the projections 12a can hold the magnet 3 with high accuracy. Are provided at equal pitches and are fixed in close contact with the outer diameter of the shaft 2. The magnet 3 is supported in the axial direction by the support portion 12b.
Step 1. A step of preparing the shaft 2 and the six magnets 3 and the positioning jig 12 which are divided for each magnetic pole, have a predetermined curvature on the surface facing the shaft, and are unpainted and non-magnetized.
Step 2. Fixing the positioning jig 12 to one end of the shaft 2 at a predetermined position;
Step 3.6: Arrange the six magnets 3 on the positioning jig 12 and arrange them at regular intervals in the predetermined axial direction of the shaft 2 and in the circumferential direction.
Step 4. A hanger 9 is attached to the other end of the shaft 2, inserted into a coating tank 10 containing the material of the liquid coating film 5, electrodeposition is applied to the shaft 2 and the magnet 3, and a gap G between the shaft 2 and the magnet 3. A step of allowing the coating film 5 to penetrate.
Step 5. A step of inserting into the constant temperature furnace 11 or a drying furnace, curing the coating film 5, and fixing the shaft 2 and the magnet 3;
Step 6. Removing the positioning jig 12 from the shaft;
Step 7. Forming the rotor 1 by magnetizing the magnet 3 to have a predetermined polarity;

The rotor 1 obtained by the manufacturing method according to the second embodiment has the same effects as the first embodiment.
If there is a place where the shaft 2 and the magnet 3 in contact with the positioning jig 12 are not covered with the coating film 5 in the step 6, the corresponding place is again obtained by the method shown in the steps 4 and 5 described above. Paint on the.
In the second embodiment, an example in which the non-magnetized magnet 3 is used has been described. However, when the magnetized magnet 3 similar to the first embodiment is arranged on the circumference of the shaft 2 with higher accuracy, the above-mentioned example 2 is also used. The positioning jig 12 may be used.
Furthermore, although the example which provided the positioning jig 12 in the end of the shaft 2 was shown, you may make it hold | maintain the magnet 3 from the both ends of an axial direction by providing in the other end.

Embodiment 2. FIG.
Next, a second embodiment will be described.
As shown in FIG. 9, the rotor 1 of the second embodiment is formed in a cylindrical shape in which the magnet 3 has a predetermined length. That is, the inner diameter of the cylindrical magnet 3 corresponds to a surface facing the outer diameter of the shaft, and therefore the inner diameter of the magnet 3 is defined as a predetermined curvature.
In Example 1 of the second embodiment, the cylindrical magnet 3 is magnetized to have a predetermined polarity in the circumferential direction. The rotor 1 has a gap of about 0.1 mm at the maximum between the outer diameter of the shaft 2 and the inner diameter of the magnet 3, that is, the outer diameter with the shaft 2, that is, the inner diameter of the magnet 3 is the shaft. In this configuration, the coating film 5 penetrates into the gap G and the magnet 3 is fixed to the shaft 2.
In the first embodiment, an example is shown in which a plurality of notch grooves 8a are provided on the inner diameter side of the magnet 3 as shown in FIG. As described above, the notch groove 8 may be provided in the shaft 2, and may be provided in both the shaft 2 and the magnet 3. The rotor 1 according to Example 1 of Embodiment 2 as described above is also effective in increasing the fixing force between the shaft 2 and the magnet 3.

Next, a method of manufacturing the rotor 1 according to the first example of the second embodiment will be described in the order of steps based on FIG. The shaft 2 of the example shown in this manufacturing method is a case where the notch groove 8 is provided in the shaft 2 of FIG. 3 or FIG. 4 described above, but is not limited to this shaft 2 and the notch groove 8 is provided. A similar manufacturing method can be used even when a notch shaft is used and a notch groove 8a is provided on the inner diameter side of the magnet 3 shown in FIG.
Step 1. As shown in FIG. 11 (a), a cylinder is magnetized to have a predetermined polarity in the circumferential direction, and an unpainted magnet 3 and a plurality of notch grooves 8 are provided in the axial direction. Preparing the shaft 2;
Step 2. Similarly, in FIG. 11A, a step of holding and arranging the magnet 3 by a magnetic force on the fixed portion 4 of the magnet 3 in a predetermined axial direction on the outer diameter surface 2 a of the shaft 2.
At this time, if a nonmagnetic or resin strip liner or wedge is provided in the gap between the shaft 2 and the magnet 3, the magnet 3 is arranged concentrically with the shaft 2.
Step 3. In FIG. 11 (b), a hanger 9 is attached to one end of the shaft 2, inserted into a coating tank 10 containing the material of the liquid coating film 5, and the shaft 2 and the magnet 3 are subjected to electrodeposition coating. And a step of allowing the coating film 5 to penetrate into the gap between the magnet 3 and the notch groove 8 of the shaft 2.
Step 4. FIG. 11C shows a step of forming the rotor 1 inserted in the constant temperature furnace 11 or the drying furnace, curing the coating film 5, and fixing the shaft 2 and the magnet 3.
The rotor 1 manufactured by the above steps 1 to 4 has the same effects as those of the first embodiment described above.

Next, Example 2 according to the second embodiment will be described.
The second embodiment is a manufacturing method using a non-magnetized magnet 3. The second embodiment is different from the first embodiment in that a positioning jig 12c that determines the position of the magnet 3 with respect to the shaft 2 is used. A state in which the positioning jig 12c is mounted on the shaft 2 is shown in FIG. The positioning jig 12c has a ring shape and is fixed in close contact with the outer diameter of the shaft 2, and supports the magnet 3 on the upper surface of the ring shape. At this time, in order to support the cylindrical magnet 3 concentrically with the shaft 2, the positioning jig 12c is provided with a centering function, for example, a flange on the outer periphery. Next, a manufacturing method is demonstrated in order of each step.
Step 1. A step of preparing a cylindrical, non-magnetized and uncoated magnet 3, a shaft 2 provided with a plurality of notch grooves 8 in the axial direction, and a positioning jig 12c.
Step 2. Disposing a positioning jig 12c at a predetermined axial position of the shaft 2;
Step 3. Placing the magnet 3 on the positioning jig 12c;
Step 4. As shown in FIG. 11 (b), a hanger 9 is attached to one end of the shaft 2, inserted into a coating tank 10 containing the material of the liquid coating film 5, and electrodeposition coating is applied to the shaft 2 and the magnet 3. And a step of allowing the coating film 5 to penetrate into the gap between the shaft and the magnet and the notch groove 8 of the shaft.
Step 5. In FIG. 11 (c), the step of inserting into the constant temperature furnace 11 or the drying furnace, curing the coating film 5, and fixing the shaft 2 and the magnet 3.
Step 6. Removing the positioning jig 12c from the shaft 2.
Step 7. Forming the rotor 1 by magnetizing the magnet 3 to have a predetermined polarity;
The rotor 1 obtained by such a manufacturing method has the same effect as the first embodiment. If there is a portion where the shaft 2 and the magnet 3 are not covered with the coating film 5 in step 6, the corresponding portion is again painted by the method shown in steps 4 and 5.

In the first embodiment and the second embodiment described above, the number of the magnets 3 is one, but a plurality of, for example, two magnets 3 divided in the axial direction may be used. In this case, the polarity between the two magnets 3 may be slightly shifted (phase is shifted).
Further, the positioning jig 12c shown in the second embodiment may have the same function, for example, the configuration of the rotor 1 in which the flange is integrally provided on the shaft 2.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

1 rotor, 2 shaft, 2a outer diameter surface, 3 permanent magnet, 3a facing surface,
5 Coating film, 6 Opposing surface, 8, 8a Notch groove, 9 Hanger, 10 Coating tank,
11 Constant temperature furnace, 12, 12c Positioning jig, Rm Curvature of facing surface,
Rs Shaft radius, G clearance.

Claims (11)

In a rotor of a permanent magnet motor provided with a permanent magnet provided on an outer diameter surface of a shaft, a predetermined curvature is provided on a surface of the permanent magnet facing the outer diameter surface of the shaft, A permanent magnet motor characterized in that only the coating film covering the permanent magnet permeates into the gap between the outer diameter surface and the opposing surface of the permanent magnet, thereby fixing the shaft and the permanent magnet. Rotor. 2. The rotor of a permanent magnet motor according to claim 1, wherein the permanent magnet has a substantially tile shape that is divided for each magnetic pole and has a predetermined length in the axial direction. The rotor of a permanent magnet motor according to claim 1, wherein the permanent magnet has a cylindrical shape with a predetermined length. The rotor of the permanent magnet motor according to claim 1, wherein a gap between the outer diameter surface of the shaft and the facing surface of the permanent magnet is about 0.1 mm at the maximum. The rotor of a permanent magnet type motor according to claim 2 or 3, wherein a notch groove extending in the axial direction is provided on the facing surface of the permanent magnet. The permanent magnet motor according to claim 2 or 3, wherein a notch groove extending in the axial direction is provided on an outer diameter surface of the shaft facing the facing surface of the permanent magnet. Rotor. The rotor of a permanent magnet motor according to claim 3, wherein a notch groove is provided on a circumference of an outer diameter surface of the shaft facing the facing surface of the permanent magnet. The rotor of the permanent magnet motor according to any one of claims 5 to 7, wherein the cutout groove has a rectangular or semicircular cross section and is a plurality of grooves. . A method for manufacturing a rotor of a permanent magnet motor, comprising the following steps.
Step 1. A step of preparing a plurality of permanent magnets which are divided into shafts and magnetic poles, are substantially tile-shaped, have a predetermined curvature on the surface facing the shaft, and are unpainted and magnetized.
Step 2. A step of holding and arranging the plurality of magnets by a magnetic force in a predetermined magnetic order at equal intervals in the outer peripheral direction on the outer diameter surface of the shaft and on a fixed portion of the magnet in the axial direction.
Step 3. A hanger is attached to one end of the shaft, inserted into a coating tank containing liquid coating film material, electrodeposition is applied to the shaft and permanent magnet, and the coating film penetrates into the gap between the shaft and the permanent magnet. Step to make.
Step 4. Curing the coating film to form a rotor in which the shaft and the permanent magnet are fixed; A method of manufacturing a rotor of a permanent magnet motor, characterized by comprising the following steps.
Step 1. The shaft is divided into magnetic poles, is substantially tile-shaped, has a predetermined curvature on the surface facing the shaft, has a notch groove extending in the axial direction on the facing surface, and is unpainted and non-coated Providing a plurality of permanent magnets and a positioning jig;
Step 2. Fixing the positioning jig at one end of the shaft at a predetermined position;
Step 3. Disposing the plurality of permanent magnets on the positioning jig, and disposing the permanent magnets on the outer diameter surface of the shaft at fixed intervals in a predetermined axial direction at equal intervals in the circumferential direction;
Step 4. A hanger is attached to the other end of the shaft, inserted into a coating tank containing a liquid coating film material, electrodeposition is applied to the permanent magnet, and the inside of the notch groove and the shaft and the permanent magnet A step to penetrate the coating film into the gap.
Step 5. Curing the paint film and fixing the shaft and the permanent magnet;
Step 6. Removing the positioning jig from the shaft;
Step 7. Magnetizing the permanent magnet to have a predetermined polarity to form a rotor. A method for manufacturing a rotor of a permanent magnet motor, comprising the following steps.
Step 1. A step of preparing a cylindrical shaft that is magnetized to have a predetermined polarity in the circumferential direction and that is provided with an unpainted permanent magnet and a plurality of cutout grooves in the axial direction.
Step 2. A step of holding and arranging the permanent magnet by a magnetic force on a fixed portion of a magnet in a predetermined axial direction on the outer diameter surface of the shaft.
Step 3. A hanger is attached to one end of the shaft, inserted into a coating tank containing a liquid coating film material, and electrodeposition coating is applied to the shaft and the permanent magnet, and the inside of the notch groove and the shaft and the permanent magnet A step to penetrate the coating film into the gap.
Step 4. Curing the coating film to form a rotor in which the shaft and the permanent magnet are fixed;

Images