JP5409800B2 - Method for manufacturing permanent magnet motor - Google Patents

Description

The present invention relates to a method for manufacturing a permanent magnet type electric motor, and particularly to a method using a permanent magnet type magnetizing device.

  Conventionally, when magnetizing a permanent magnet of a permanent magnet electric motor, a magnetizing yoke that generates a large magnetic field when energized by a pulse power supply is used. In addition, there is a problem that both the magnetized power source and the magnetized power source become large.

  In order to solve this, there is a method in which the magnetized power source and the power source voltage are suppressed by dividing the magnetized coil, which is regarded as one coil, into a unit in which the winding resistance can be ignored.

  As a conventional example using such a technique, for example, in Patent Document 1 below, by providing an output unit of a magnetized power supply corresponding to each divided magnetizing coil, and operating each output unit simultaneously, A multi-pole magnetizing method for large magnets that can secure the required output current without using a high-voltage, high-energy large-scale power supply and that can be magnetized by using a small, power-saving and inexpensive power supply. is suggesting.

Japanese Unexamined Patent Publication No. 7-106129 (page 2, line 0007, FIG. 1)

However, there is a need for a simpler method for manufacturing a permanent magnet motor.

An object of the present invention is to provide a simpler manufacturing method of a permanent magnet type electric motor using a permanent magnet type magnetizing apparatus .

The present invention includes at least a magnetic field generating space having a dimension capable of passing a magnetized piece, and a pair of permanent magnets provided in opposite positions of the magnetic field generating space and having the same magnetic field direction. A magnetic circuit that circulates from the permanent magnet through the magnetic field generation space, enters the other permanent magnet, and finally returns to the one permanent magnet, and the magnetic circuit includes the pair of permanent magnets A pair of permanent magnets provided on the magnetic field generation space side, one end contacting the permanent magnet, the other end contacting the magnetic field generation space, and a cross-sectional area of a surface perpendicular to the magnetic field direction from the one end toward the other end Each of the permanent magnets and a yoke connecting the opposite side of the permanent magnet to the opposite side of the pole piece, or the pair of permanent magnets and the magnetic field generating space at the center. A permanent magnet type magnetizing device comprising a plurality of intermediate permanent magnets that are arranged in a Halbach region including the pair of permanent magnets so as to form the circulating magnetic field between the pair of permanent magnets. The first magnetizing step of magnetizing both ends, which are portions that are in contact with the poles when fixed to the field yoke of the magnetized piece before being fixed to the yoke, and the first magnetizing step Adhering step of pressing the adhesive by the magnetic attractive force of the adherent magnetic piece until the adherent magnetic piece is adhered to the field yoke with an adhesive and the adhesive is cured; and after the adhesive is cured, A permanent magnet comprising: a second magnetizing step for magnetizing the entire magnetized piece fixed to the field yoke by an electric magnetizing device that conducts and magnetizes the magnet; There is a method for manufacturing an electric motor.

According to the present invention, it is possible to provide a simpler method for manufacturing a permanent magnet type electric motor using a permanent magnet type magnetizing device .

It is a side view which shows the structure of the magnetizing apparatus by Embodiment 1 of this invention. It is a perspective view which shows the structure of the magnetizing apparatus by Embodiment 2 of this invention. It is a perspective view which shows the structure of the magnetizing apparatus by Embodiment 3 of this invention. It is a perspective view which shows the structure of the magnetizing apparatus by Embodiment 4 of this invention. It is a perspective view which shows the structure of the magnetizing apparatus by Embodiment 4 of this invention. It is a perspective view which shows the structure of the magnetizing apparatus by Embodiment 5 of this invention. It is a figure for demonstrating the magnetizing apparatus by Embodiment 6 of this invention. It is a figure for demonstrating the magnetizing apparatus by Embodiment 6 of this invention. It is a perspective view which shows the structure of the magnetizing apparatus by Embodiment 7 of this invention. It is a perspective view which shows the structure of the magnetizing apparatus by Embodiment 8 of this invention. It is a perspective view which shows the structure of the magnetizing apparatus by Embodiment 9 of this invention. It is a perspective view which shows the structure of the magnetizing apparatus by Embodiment 10 of this invention. It is a perspective view of an example of the permanent magnet type magnetizing apparatus used with the manufacturing method of the permanent magnet type electric motor by Embodiment 11 of this invention. It is a perspective view of another example of the permanent magnet type | mold magnetizing apparatus used with the manufacturing method of the permanent magnet type electric motor by Embodiment 11 of this invention. It is a figure which shows the magnetized to-be-magnetized piece stuck on the field yoke in the manufacturing method of the permanent magnet type electric motor by Embodiment 11 of this invention.

  Hereinafter, the present invention will be described according to each embodiment. In addition, in each embodiment, the same or equivalent part is shown with the same code | symbol, and the overlapping description is abbreviate | omitted.

Embodiment 1 FIG.
1 is a side view showing a configuration of a magnetizing apparatus according to Embodiment 1 of the present invention. In FIG. 1, the magnetizing device includes a pair of magnetic field generating permanent magnets 1a and 1b, a pair of pole pieces (magnetic pole pieces) 2a and 2b, and a yoke (junction) 2 connecting the magnetic field generating permanent magnets 1a and 1b. The magnetic circuit 4 configured generates a circulating magnetic field 4a. This magnetic field 4 a passes through the magnetic field generation space 3 formed in the magnetic circuit 4. The pole pieces 2a and 2b and the yoke 2 are made of a high magnetic permeability soft magnetic material such as pure iron or low carbon steel.

  A pair of magnetic field generating permanent magnets (hereinafter referred to as magnets) 1 a and 1 b having the same magnetic field direction are arranged opposite to each other on both sides of the magnetic field generating space 3. The magnetic field generation space 3 has a dimension that allows the magnetized piece 5 to pass through. The magnetized piece 5 is, for example, a neodymium magnet (neodymium magnet before magnetization). The pole pieces 2a and 2b provided adjacent to the magnets 1a and 1b on the magnetic field generation space 3 side are surfaces which are in contact with the magnets 1a and 1b at one end and the magnetic field generation space 3 at the other end and perpendicular to the magnetic field direction. Has a tapered shape in which the cross-sectional area decreases from one end to the other end. The yoke 2 connects between the pole pieces 2a and 2b opposite to the pair of magnets 1a and 1b.

  Thereby, the magnetic flux density can be improved by converging the magnetic fluxes of the magnets 1a and 1b to the surfaces of the pole pieces 2a and 2b facing the magnetic field generation space 3, and 2T (Tesla) or more necessary for magnetization. Can be generated in the magnetic field generating space 3. This eliminates the need for a magnetized power supply facility and the like, and accordingly eliminates the need for cooling the magnetized power source, thereby reducing the waiting time for the magnetizing operation.

Embodiment 2. FIG.
FIG. 2 is a perspective view showing a configuration of a magnetizing apparatus according to Embodiment 2 of the present invention. In FIG. 2, the magnetic circuit 4 of the magnetizing apparatus is composed of a pair of magnetic field generating permanent magnets 1a and 1b and a plurality of intermediate permanent magnets (hereinafter referred to as intermediate magnets) 1c provided therebetween. The magnets 1a and 1b and the plurality of intermediate magnets 1c are arranged in a Halbach shape in an annular shape (in this embodiment, an octagonal column having a space in the center). An octagonal columnar magnetic field generation space 3 is formed at the center of the octagonal columnar magnetic circuit 4.

  That is, for example, the pair of magnets 1a, 1b and the plurality of intermediate magnets 1c have the same shape, and each one octagonal column is centered on an octagonal column axis (an axis passing through the center of each of the upper and lower surfaces of the octagon). The triangular prism divided into eight equal parts has a shape of a quadrangular prism having a trapezoidal horizontal cross section in which a notch portion is formed so as to form an inner side surface parallel to the outer side surface at a portion on the center side of the octagonal column. The configuration of the magnetic circuit 4 is such that four or more even-numbered magnets including a pair of magnets in which the direction of the magnetic field is directed are arranged in the magnetic field generating space 3 in a circular Halbach arrangement, and four or more even angles having a space in the center. The polygonal column may be used.

  The magnetic circuit 4 is a magnet only and forms a magnetic field in a plane orthogonal to the axial direction of the octagonal prism. The magnetized piece 5 can be magnetized by the magnetic field generated in the magnetic field generating space 3 by inserting the magnetized piece 5 in the magnetic field generating space 3 along the axial direction of the octagonal prism.

  Thereby, since a magnetic circuit can be formed only with a permanent magnet without using a pole piece, the magnetizing apparatus can be reduced in size. Even when the length of the magnetizing device in the axial direction, that is, the length in the insertion direction of the magnetized piece 5 in the magnetic field generating space 3 is shorter than the length in the longitudinal direction of the magnetized piece 5, the magnetized piece 5. Can be magnetized regardless of the length of the magnetized piece 5, since the entire magnetized piece 5 can be magnetized by penetrating the inside of the magnetic field generating space 3 along the axial direction of the magnetizing device.

Embodiment 3 FIG.
3 is a perspective view showing the configuration of a magnetizing apparatus according to Embodiment 3 of the present invention. In the magnetizing apparatus of this embodiment, as shown in FIG. 3, in the magnetizing apparatus of the second embodiment, the magnetized piece 5 is guided into the magnetic field generating space 3 or further magnetized in the magnetic field generating space 3. A guide rail 6 is installed as a transport mechanism that passes in the axial direction of the apparatus.

  Thereby, the magnetized piece 5 can be inserted or penetrated into the magnetic field generating space 3 along the guide rail 6. Further, by fixing the guide rail 6 in the magnetic field generating space 3 with high precision (in this case, the guide rail 6 also has a function of a positioning mechanism), the magnetized piece 5 can be placed in a desired position (for example, a magnetic field). It can be accurately positioned so as to pass through the center of the generation space and the axial position of the polygonal column-shaped magnetizing device, thereby preventing poor magnetization.

Embodiment 4 FIG.
4 and 5 are perspective views showing the structure of a magnetizing apparatus according to Embodiment 4 of the present invention. FIG. 4 shows a state before the magnetized piece 5 is inserted into the magnetizing device, and FIG. 5 shows a state where the magnetized piece 5 is inserted into the magnetizing device. As shown in FIGS. 4 and 5, the magnetized piece 5 is mounted on a tray 8 having a handle 8 a and inserted into the magnetic field generation space 3. The tray 8 has a dimension capable of positioning the magnetized magnetic piece 5 at a desired position in the magnetic field generating space 3 when the magnetized piece 5 is mounted and inserted into the magnetic field generating space 3 (positioning mechanism). Further, the magnetized piece 5 can be passed through the magnetic field generating space 3 along the axial direction of the magnetizing device. As a result, the magnetized piece 5 can be magnetized manually and the magnetized piece 5 can be accurately positioned at a desired position in the magnetic field generating space 3, thereby preventing poor magnetization.

Embodiment 5 FIG.
6 is a perspective view showing the structure of a magnetizing apparatus according to Embodiment 5 of the present invention. In this embodiment, as shown in FIG. 6, the magnetized piece 5 mounted on the tray 8 passes through the magnetic field generating space 3 along the axial direction of the magnetizing apparatus in the magnetizing apparatus of the second embodiment. Thus, the belt conveyor 9 is installed and fixed. As a result, the magnetized piece 5 can be magnetized automatically by using the tray 8 that can automatically magnetize the magnetized piece 5 and has the function of a positioning mechanism in the shape of the tray 8 of the fourth embodiment. 3 can be accurately positioned at a desired position in 3 so that a magnetization failure can be prevented.

Embodiment 6
7 and 8 are views for explaining a magnetizing apparatus according to Embodiment 6 of the present invention. FIG. 7 is a perspective view of a magnetizing apparatus in the case of magnetizing a magnetized piece 5 having a cross-sectional shape of a D type (a saddle type, a semicylindrical type). FIGS. 8A to 8C are diagrams in the case of magnetizing the magnetized magnetized piece 5 having a C-shaped (arch-shaped) cross section. FIG. 8A is a perspective view, and FIG. (A) when viewed from the arrow A in the case where the magnetic piece 5 is mounted on the guide rail 6 with the inner curved surface down, (c) is the guide rail 6 with the magnetic piece 5 to be attached facing down on the outer curved surface. It is the arrow view seen from the arrow A of (a) at the time of carrying in.

  Since the motor requires both N and S polarity magnets, the direction of the magnetized piece 5 to be inserted into the magnetizing device is reversed for each polarity. In the case of the magnetized magnetic piece 5 having a C-shaped cross section, the inner side surface of the guide rail 6 is formed in accordance with the shape of both end surfaces of the magnetized magnetic piece 5 as shown in FIGS. Thus, even if the magnetized piece 5 is mounted with the inner curved surface down or mounted with the outer curved surface down, it can be stably inserted into the magnetizing device. Further, since the D-shaped magnetized piece 5 can be inverted up and down using the guide rail of FIG. 8, the N-pole and S-pole can be magnetized in the same manner.

  Thereby, since the magnetizing device does not require a power source, it is easy to prepare the magnetizing device for the N pole and the S pole separately. In that case, if one of the two magnetizing devices having the same configuration is turned upside down, both polarities can be handled.

Embodiment 7 FIG.
FIG. 9 is a perspective view showing the configuration of a magnetizing apparatus according to Embodiment 7 of the present invention. As shown in FIG. 9, in the magnetizing apparatus of this embodiment, pole pieces 2a and 2b are provided adjacent to the respective magnetic field generating spaces 3 of the magnets 1a and 1b in the magnetizing apparatus of the second embodiment. ing. The pole pieces 2a and 2b are arranged to face each other with the magnetic field generation space 3 interposed therebetween.

  Thereby, by converging the magnetic flux of the magnetic circuit 4 generated by the magnet with the pole piece, a stronger magnetic field can be generated in the magnetic field generating space 3 than the magnetizing device of the second embodiment, and the magnetizing device can be downsized. it can. Further, it is possible to use the guide rail 6, the tray 8, and the belt conveyor 9 according to the third to sixth embodiments.

Embodiment 8 FIG.
FIG. 10 is a perspective view showing the configuration of a magnetizing apparatus according to Embodiment 8 of the present invention. In the magnetizing apparatus of this embodiment, as shown in FIG. 10, in the magnetic circuit 4 of the magnetizing apparatus of the second embodiment, it is parallel to the magnetic flux direction of magnetization (the direction of the arrow indicating the magnetic field of the magnets 1a and 1b). At least one of the intermediate magnets 1c is extracted to form the opening 10. The opening 10 has such a size that the magnetized piece 5 can be inserted into the magnetic field generating space 3 from the opening 10 in a direction orthogonal to the axial direction of the magnetizing device in the horizontal plane.

  Thereby, when inserting the magnetized piece 5 into the magnetic field generating space 3, the magnetization range can be adjusted at the insertion position of the magnetized piece 5 in the direction perpendicular to the axial direction into the magnetic field generating space 3. By suppressing the magnet attractive force during magnet assembly, the magnet assembly operation is facilitated. Further, it is possible to use the guide rail 6, the tray 8, and the belt conveyor 9 according to the third to sixth embodiments.

Embodiment 9 FIG.
FIG. 11 is a perspective view showing the configuration of a magnetizing apparatus according to Embodiment 9 of the present invention. The magnetizing apparatus of this embodiment shown in FIG. 11 has a length necessary for magnetizing the field side magnet of the permanent magnet type linear motor. The permanent magnet rows 11 and 12 of Halbach arrangement arranged in two rows in a straight line are arranged facing each other across the magnetic field generation space 3.

  The intermediate permanent magnets 11 a and 12 a having a magnetic field parallel to the arrangement direction of the permanent magnets in the permanent magnet rows 11 and 12 are permanent in which the magnetic flux direction of the intermediate permanent magnet 11 a in the permanent magnet row 11 is opposed across the magnetic field generation space 3. The intermediate permanent magnets 12a of the magnet array 12 are arranged so as to be opposite to each other in the magnetic flux direction. The magnetic field generating permanent magnets 11b and 12b having a magnetic field perpendicular to the direction in which the permanent magnets in the permanent magnet arrays 11 and 12 are aligned are such that the magnetic flux generating direction of the magnetic field generating permanent magnet 11b in the permanent magnet array 11 is the magnetic field generating space 3. Are arranged in the same direction as the magnetic flux direction of the magnetic field generating permanent magnet 12a of the permanent magnet row 12 facing each other.

  Thereby, the field side stator 13 for a permanent magnet type linear motor in which a large number of magnetized pieces 5 are arranged can be magnetized without a power source.

Embodiment 10 FIG.
12 is a perspective view showing the structure of a magnetizing apparatus according to Embodiment 10 of the present invention. The magnetizing apparatus of this embodiment shown in FIG. 12 is adjacent to the surface of the magnetic field generating permanent magnets 11b, 12b on the magnetic field generating space 3 side of each magnetic field generating permanent magnet 11b, 12b of the magnetizing apparatus of the eighth embodiment. Thus, pole pieces 2a and 2b are provided. The pole pieces 2a and 2b are made to face each other with the magnetic field generation space 3 interposed therebetween.

  Thereby, the magnetic flux generated by the magnetic field generating permanent magnets 11b and 12b can be converged by the pole pieces 2a and 2b, and a stronger magnetic field can be generated in the magnetic field generating space 3 than the magnetizing device of the eighth embodiment. The magnetizing device can be reduced in size.

Embodiment 11 FIG.
FIGS. 13 to 15 are views for explaining a method of manufacturing the permanent magnet type motor according to the present invention. This manufacturing method includes magnetization of a magnetized piece and attachment of the magnetized magnetized piece, that is, a permanent magnet to a field yoke. 13 and 14 are perspective views of a permanent magnet type magnetizing apparatus used in this manufacturing method. FIG. 15 is a diagram showing a magnetized magnetized piece (magnet) affixed to a field yoke 15 for a permanent magnet motor.

  Since the magnet is attached to a field yoke 15 (rotor core) for a permanent magnet type motor using an adhesive (not shown), it is necessary to pressurize the magnet until the adhesive is cured. Therefore, in the present invention, the magnet is partially magnetized before being attached to the field yoke. Alternatively, the entire magnet may be incompletely magnetized with a slightly weak magnetic field. The partial magnetization or the weak magnetization (pre-magnetization) before the sticking is performed using the permanent magnet type magnetizing apparatus shown in FIG. Positioning and passing the adherent magnetic piece 5 with respect to the magnetic field generation space 3 of the magnetizing device as in the above-described embodiment so that the magnetic field is applied to the desired position of the adherent magnetic piece 5 with the desired intensity. Thus, for example, only the vicinity of both end surfaces of the magnetized piece 5, which is a portion that hits between the poles when fixed to the field yoke, is magnetized.

  13 expands the width of the field generating permanent magnets 1a, 1b and the field generating space 3 of the magnetizing apparatus of the seventh embodiment (see FIG. 9), for example, and makes the pole pieces 2a, 2b magnetic fields. It is provided along both sides of the generation space 3. Instead of the magnetizing device of FIG. 13, the magnetizing device of FIG. 14 may be used. The magnetizing device of FIG. 14 is a combination of two magnetizing devices of Embodiment 8 (see FIG. 10) having openings 10 in the opposite direction, shifted in the axial direction, for example.

  Since these magnetizing apparatuses do not use a power source, it is easy to shorten the tact time by preparing a plurality of these magnetizing apparatuses.

  Next, an adhesive is applied to the affixed surface of the magnetized magnetized piece 5 or field yoke 15, and the magnetized piece 5 is affixed to the field yoke 15 as shown in FIG. At this time, since the magnetized piece 5 is partially magnetized or weakly magnetized, there is no work risk due to magnetic attraction when being attached, and the magnetized piece 5 caused by an impact is not affected. There is no damage. If the magnetized piece 5 is completely magnetized before being attached, the magnetized piece 5 is attracted to the field yoke 15 with a strong magnetic force. At this time, if it is affixed carelessly, the magnetized piece 5 may be broken by an impact that collides with the field yoke 15. Therefore, when sticking the fully magnetized magnetized piece 5, it is necessary to work while paying attention not to break the magnetized piece 5.

  In addition, after bonding, the magnetized magnetic piece 5 pressurizes the bonded portion by its magnetic attraction force without being peeled off by its own weight before the adhesive is cured, so there is no need to prepare any other pressurizing means. . Since the applied pressure is uniform for all the magnetized magnetic pieces 5, there is also an effect of making the adhesive thickness uniform. On the other hand, when the magnetization is performed after the magnetized pieces 5 are attached, all the magnetized pieces 5 must be continuously pressed until the adhesive is cured. The more a multipolar motor is used, the larger the pressurizing jig becomes.

  Finally, since the magnetized piece 5 is only partially magnetized or weakly magnetized, after the adhesive is cured, the remaining part is energized by a power source and magnetized. Ordinary magnetization is performed using a magnetizing device (not shown).

  The rotor of the permanent magnet type motor thus manufactured is as shown in FIG. As is widely known, when the magnetized piece is magnetized after being attached, the magnetizing magnetic field is parallel to the magnetization direction of the magnetized piece at the pole interval 16, that is, at both ends of the magnetized piece. It is hard to magnetize because it does not become. Therefore, in general, the power source capacity is increased due to both ends of the magnetized piece. However, in this embodiment, since both ends of the magnetizing magnetic field are magnetized in advance, the capacity of the magnetizing power source here can be suppressed.

  In addition, this invention is not limited to each said embodiment, It cannot be overemphasized that all the possible combinations of each embodiment are included.

Industrial applicability

The present invention is not limited to magnetizing a permanent magnet of a permanent magnet electric motor, and can be used for magnetizing work in many other fields.

  1a, 1b Field generating permanent magnet, 1c Intermediate magnet, 2 Yoke, 2a, 2b Pole piece, 3 Field generating space, 4 Magnetic circuit, 4a Magnetic field, 5 Magnetized piece, 6 Guide rail, 8 Tray, 8a Handle , 9 Belt conveyor, 10 openings, 11, 12 permanent magnet row, 11a, 12a intermediate permanent magnet, 11b, 12b magnetic field generating permanent magnet, 13 field side stator, 15 field yoke, pole 16.

Claims (1)

A magnetic field generating space having a dimension capable of passing the magnetized magnetized piece, and at least a pair of permanent magnets having the same magnetic field direction provided at positions facing each other in the magnetic field generating space. A magnetic circuit that forms a circulating magnetic field that penetrates the generation space and enters the other permanent magnet and finally returns to the one permanent magnet, and
The magnetic circuit is
The pair of permanent magnets;
Provided on the magnetic field generation space side of the pair of permanent magnets, one end is in contact with the permanent magnet, the other end is in contact with the magnetic field generation space, and a cross-sectional area of a surface orthogonal to the magnetic field direction from the one end toward the other end A pole piece with a decreasing shape,
A yoke connecting between the pole piece and the opposite side of each permanent magnet;
Or comprising
The pair of permanent magnets and a plurality of intermediate permanent magnets that form the circulating magnetic field by being arranged in a halbach arrangement including the pair of permanent magnets between the pair of permanent magnets so as to form the magnetic field generating space at the center. Consist of,
A first magnetizing step of magnetizing both ends, which are portions that are in contact with each other when fixed to the field yoke of the magnetized piece before being fixed to the field yoke, by a permanent magnet type magnetizing device;
Adhering step of adhering the magnetized magnetic piece magnetized in the first magnetizing step to the field yoke with an adhesive and pressurizing the adhesive by the magnetic attractive force of the magnetized magnetized piece until the adhesive is cured When,
A second magnetizing step of magnetizing the entire magnetized piece fixed to the field yoke by an electric magnetizing device that conducts and magnetizes with a power source after the adhesive is cured;
A method for manufacturing a permanent magnet electric motor.

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