JP2024018012A - Field element, motor, blower device, refrigeration cycle device, method for manufacturing field element, and method for manufacturing motor - Google Patents

Abstract

To solve the following problem in which a conventional technique of integrally molding a magnet and back yoke cannot conduct the selection that the back yoke is not added even when the intensity of a magnetic flux is sufficient even without addition of the back yoke.SOLUTION: A rotor 20 includes: a bond magnet 21; and a back yoke 23. The bond magnet 21 is cylindrical. The bond magnet 21 is integrally molded. The back yoke 23 is installed on the outer periphery side of the bond magnet 21 after integral molding.SELECTED DRAWING: Figure 3

Description

The present invention relates to a field element, a motor, an air blower, a refrigeration cycle apparatus, a method for manufacturing a field element, and a method for manufacturing a motor.

As shown in Patent Document 1 (Japanese Patent No. 3306059), there is a technique of integrally molding a magnet and a soft magnetic member in order to suppress leakage magnetic flux of a field element.

In Patent Document 1, it is essential to incorporate a step of adding a soft magnetic member into the field element manufacturing process. Therefore, even if the strength of the magnetic flux of the magnet is sufficient even without adding a soft magnetic member, there is a problem in that it is not possible to choose not to add a soft magnetic member.

The field element of the first aspect includes a bonded magnet and a soft magnetic member. The bonded magnet is cylindrical. Bonded magnets are integrally molded. The soft magnetic member is attached to the outer peripheral side of the bonded magnet after integral molding.

In the field element of the first aspect, by attaching the soft magnetic member after integrally molding, it is possible to select whether or not to add the soft magnetic member depending on the strength of the magnetic flux of the bonded magnet.

The field element of the second viewpoint is the field element of the first viewpoint, and the bonded magnets are oriented polar anisotropically.

With such a configuration, the field element according to the second aspect can reduce torque ripple.

The field element of the third viewpoint is the field element of the second viewpoint, and the field element is a rotor. The field element is arranged radially outward of the stator. The radial thickness Lm of the bonded magnet and the arc length Ls of the radially inner magnetic pole surface per pole of the bonded magnet satisfy Lm<Ls/2.

The field element of the fourth viewpoint is the field element of the second viewpoint, and the field element is a rotor. The field element is arranged radially outward of the stator. The radial thickness Lm of the bonded magnet, the arc length Ls of the radially inner magnetic pole surface per pole of the bonded magnet, and the radial thickness Ly of the soft magnetic member are as follows: Ly<Ls/2-Lm, satisfy.

The field element according to the fifth aspect is the field element according to any one of the first to fourth aspects, and the soft magnetic member is a soft magnetic material tape. The soft magnetic material tape is fixed by adhering to the outer peripheral surface of the bonded magnet.

The field element according to the sixth aspect is the field element according to the fifth aspect, and the soft magnetic material tape has iron as a base material.

The field element according to the seventh aspect is the field element according to the fifth aspect, and the thickness of the soft magnetic material tape is 0.1 mm or more and 1.0 mm or less.

The field element in the eighth aspect is the field element in any one of the first to fourth aspects, and the soft magnetic member is SPCC (Steel Plate Cold Commercial) or SPCE (Steel Plate Cold Deep Drawn Extra). ) is the base material.

The field element according to the ninth aspect is the field element according to any one of the first to fourth aspects, and the soft magnetic member has a non-oriented electromagnetic steel strip or a grain-oriented electromagnetic steel strip as a base material. do.

The field element according to the tenth aspect is the field element according to any one of the first to fourth aspects, and the soft magnetic member is a C-shaped or cylindrical member.

The field element according to the eleventh aspect is the field element according to the tenth aspect, in which the C-shaped soft magnetic member is fixed to the outer peripheral side of the bonded magnet by interference fit due to restoring force. Alternatively, the C-shaped soft magnetic member is fixed to the outer circumferential side of the bonded magnet with tape, with both circumferential ends joined. Alternatively, the C-shaped soft magnetic member is fixed by hooking hook portions provided at both circumferential ends on the outer circumferential side of the bonded magnet to each other. Alternatively, the C-shaped soft magnetic member is fixed to the outer peripheral side of the bonded magnet by overlapping and welding. Alternatively, the C-shaped soft magnetic member is fixed by overlapping and press-contacting the outer peripheral side of the bonded magnet. Alternatively, the C-shaped soft magnetic member is fixed to the outer peripheral side of the bonded magnet by superimposing and ultrasonically welding the member.

The field element according to the twelfth aspect is the field element according to the tenth aspect, in which the C-shaped or cylindrical soft magnetic member is fixed to the outer circumferential side of the bonded magnet by overlapping and bonding. Ru. Alternatively, the C-shaped or cylindrical soft magnetic member has a convex portion provided on the inner peripheral surface of the soft magnetic member and a recessed portion provided on the outer peripheral surface of the bonded magnet on the outer peripheral side of the bonded magnet. It is fixed by fitting the Alternatively, the C-shaped or cylindrical soft magnetic member is fixed to the outer peripheral side of the bonded magnet by cold fitting, in which the cooled bonded magnet is covered with a room temperature soft magnetic member. Alternatively, the C-shaped or cylindrical soft magnetic member is fixed to the outer circumferential side of the bonded magnet by shrink fitting in which a heated soft magnetic member is placed over the bonded magnet at room temperature. Alternatively, the C-shaped or cylindrical soft magnetic member is fixed to the outer peripheral side of the bonded magnet by the magnetic force of the bonded magnet.

A motor according to a thirteenth aspect includes a field element and a stator. The field element is any one of the first to twelfth aspects. The stator is arranged radially inside the field element.

The air blower according to the fourteenth aspect includes the motor according to the thirteenth aspect and a fan. The fan is driven by a motor.

The refrigeration cycle device according to the fifteenth aspect includes the blower device according to the fourteenth aspect.

In the method for manufacturing a field element according to the sixteenth aspect, a bonded magnet and a soft magnetic member are prepared. The bonded magnet is cylindrical. Bonded magnets are integrally molded. In a method for manufacturing a field element, a soft magnetic member is attached to the outer circumferential side of a bonded magnet.

The motor according to the seventeenth aspect includes a bonded magnet and a soft magnetic member. The bonded magnet is cylindrical. Bonded magnets are integrally molded. A bonded magnet is attached to the motor when a predetermined magnetic flux strength is obtained. When a predetermined magnetic flux strength cannot be obtained, a bonded magnet with a soft magnetic member attached to the outer circumference of the motor is attached.

With such a configuration, the motor according to the seventeenth aspect can select whether or not to add a soft magnetic member depending on the strength of the magnetic flux of the bonded magnet.

In the method for manufacturing a motor according to the eighteenth aspect, a bonded magnet and a soft magnetic member are prepared. The bonded magnet is cylindrical. Bonded magnets are integrally molded. In the motor manufacturing method, bonded magnets are attached when a predetermined magnetic flux strength is obtained. In the motor manufacturing method, when a predetermined magnetic flux strength cannot be obtained, a bonded magnet with a soft magnetic member attached to the outer circumference is attached.

In the method for manufacturing a motor according to the eighteenth aspect, with such a configuration, it is possible to select whether or not to add a soft magnetic member depending on the strength of the magnetic flux of the bonded magnet.

It is an external view of an air conditioner. It is a sectional view of an indoor unit. FIG. 3 is a side view of the motor. FIG. 3 is a diagram showing how a bonded magnet is injection molded. FIG. 3 is a cross-sectional view showing a bonded magnet and a back yoke per pole. It is a figure which shows an example of a C-shaped back yoke. It is a figure which shows an example of a C-shaped back yoke.

(1) Configuration of refrigeration cycle device The refrigeration cycle device 100 is a device that uses a vapor compression refrigeration cycle to cool or heat a temperature-adjusted object. In this embodiment, the refrigeration cycle device 100 is an air conditioner 100 that cools or heats air in an air-conditioned space as a temperature-adjusted space. The type of refrigeration cycle device 100 is not limited to the air conditioner 100, and may be a water heater, a floor heating device, a refrigeration device, or the like.

FIG. 1 is an external view of the air conditioner 100. As shown in FIG. 1, the air conditioner 100 mainly includes an indoor unit 110 that is attached to a wall or the like indoors, and an outdoor unit 120 that is installed outdoors. The indoor unit 110 and the outdoor unit 120 are connected to each other via a refrigerant pipe 130, thereby configuring a refrigerant circuit of the air conditioner 100. The air conditioner 100 performs cooling operation, heating operation, etc. in a space where the indoor unit 110 is installed.

FIG. 2 is a sectional view of the indoor unit 110. As shown in FIGS. 1 and 2, the indoor unit 110 mainly includes a frame 81, a heat exchanger 82, a flap 83, a front panel 84a, a main body cover 84b, and an air blower 70. The heat exchanger 82 and the air blower 70 are supported by a frame 81 and covered by a front panel 84a and a main body cover 84b. A suction port 86a is formed on the upper surface of the main body cover 84b, and an air outlet 86b is formed on the lower surface of the main body cover 84b. The flap 83 is arranged at the air outlet 86b.

(2) Configuration of blower device FIG. 3 is a sectional view of the motor 50. As shown in FIGS. 2 and 3, the blower device 70 mainly includes a motor 50 and a fan 60. Fan 60 is driven by motor 50. In this embodiment, fan 60 is a crossflow fan.

Air blower 70 creates an air flow to facilitate heat exchange by heat exchanger 82 . The air sucked in from the suction port 86a by the blower device 70 exchanges heat with the refrigerant flowing inside the heat exchanger tubes of the heat exchanger 82. The heat-exchanged air passes through the fan 60 and is blown out of the indoor unit 110 from the air outlet 86b. The direction of the blown air can be changed by changing the position of the flap 83.

(3) Motor Configuration As shown in FIG. 3, the motor 50 is arranged at the right end of the fan 60. The motor 50 mainly includes a stator 10, a rotor 20 (field element), and a shaft 30. The motor 50 is an outer rotor type motor.

As shown in FIG. 3, the motor 50 is fixed to the frame 81 with a sealing member 87 wound around the mounting leg 19 of the stator 10. Further, the motor 50 is sealed by a sealing member 88.

In the following description, the "axial direction" is the direction of the rotation axis 31 of the rotor 20. The “radial direction” is a radial direction centered on the rotating shaft 31 of the rotor 20. The “circumferential direction” is a circumferential direction centered on the rotating shaft 31 of the rotor 20.

(3-1) Stator As shown in FIG. 3, the stator 10 is arranged radially inside the rotor 20. The stator 10 mainly includes a stator core 11 , a coil 12 , an insulator 13 , and a connection plate 14 . The stator 10 is integrally molded by resin molding. A bearing 15 is arranged between the inner circumference of the stator 10 and the shaft 30. Stator 10 supports shaft 30 via bearing 15.

The stator core 11 is formed by laminating steel plates that are conductive soft magnetic materials. Stator core 11 has a plurality of teeth. The coil 12 is formed by winding a copper wire coated with an insulating material such as enamel resin around the teeth of the stator core 11. The insulator 13 is made of an insulating resin material. Insulator 13 is provided between stator core 11 and coil 12. The insulator 13 insulates between the stator core 11 and the coil 12 so that the current flowing through the coil 12 is not transmitted to the stator core 11. Stator core 11 has a through hole through which shaft 30 passes along the axial direction. The wiring board 14 is connected to the lead wires at the beginning and end of winding of the coil 12. The wiring board 14 is connected to an external power source or the like via a lead wire.

(3-2) Rotor As shown in FIG. 3, the rotor 20 mainly includes a bonded magnet 21, a connecting portion 22, and a back yoke 23 (soft magnetic member). The rotor 20 is arranged radially outward of the stator 10.

Bonded magnet 21 has a cylindrical shape. The bonded magnet 21 is oriented with ten poles anisotropically. The connecting portion 22 engages with the shaft 30 and connects the bonded magnet 21 and the shaft 30. Thereby, the rotor 20 rotates around the rotation axis 31 on the radially outer side of the stator 10 integrally with the shaft 30. The bonded magnet 21 and the connecting portion 22 are integrally molded by injecting a resin made by mixing rare earth or ferrite magnet powder with a binder such as plastic or rubber into a mold. FIG. 4 is a diagram showing how the bonded magnet 21 is injection molded. As shown in FIG. 4, before the resin is injected into the cylindrical mold 21a for forming the bonded magnet 21, a permanent magnet 24 for magnetic field orientation is placed inside the cylindrical mold 21a in the radial direction. is placed. In FIG. 4, ten permanent magnets 24 are arranged. Further, in FIG. 4, lines of magnetic force 25 are drawn that indicate the magnetic fields generated by each permanent magnet 24. In this state, resin at about 300° C. is injected into the cylindrical mold 21a (from the front to the back in FIG. 4). Thereafter, the resin is hardened by cooling, thereby forming a bonded magnet 21 having ten poles oriented in polar anisotropy.

The back yoke 23 suppresses leakage magnetic flux of the rotor 20. The back yoke 23 is a soft magnetic tape made of iron as a base material. The thickness of the soft magnetic material tape is 0.1 mm or more and 1.0 mm or less. The back yoke 23 is fixed by integrally molding the bonded magnet 21 and the connecting portion 22 and then adhering it to the outer peripheral surface of the bonded magnet 21. FIG. 5 is a cross-sectional view showing the bonded magnet 21 and back yoke 23 per pole. As shown in FIG. 5, the radial thickness Lm of the bonded magnet and the arc length Ls of the radially inner magnetic pole surface per pole of the bonded magnet are designed to satisfy Lm<Ls/2. . Further conditions are added such that the radial thickness Lm of the bonded magnet 21, the arc length Ls of the radially inner magnetic pole surface per pole of the bonded magnet 21, and the radial thickness Ly of the back yoke 23 are Ly It may be designed to satisfy <Ls/2−Lm.

(3-3) Shaft The shaft 30 is a cylindrical member made of metal. As shown in FIG. 3, the shaft 30 is connected to the fan 60 at one end in the axial direction, and connected to the rotor 20 at the other end in the axial direction.

The stator 10 generates a magnetic field for rotating the rotor 20 using electric power supplied to the coil 12 from the outside via the wiring board 14 . The rotor 20 is rotated by the magnetic field generated from the stator 10. A shaft 30 connected to the rotor 20 rotates around a rotating shaft 31 extending in the axial direction. The motor 50 supports the shaft 30 and transmits rotational force to the fan 60 via the shaft 30. Thereby, the motor 50 rotates the fan 60 around the rotating shaft 31.

(4) Features (4-1)
Conventionally, in order to suppress magnetic flux leakage from a rotor, there is a technique of integrally molding a magnet and a back yoke.

In the conventional technology, it is essential to incorporate a process of adding a back yoke into the manufacturing process of the rotor. Therefore, even if the strength of the magnetic flux of the magnet is sufficient even without adding the back yoke, there is a problem in that it is not possible to choose not to add the back yoke.

The rotor 20 of this embodiment includes a bonded magnet 21 and a back yoke 23. Bonded magnet 21 has a cylindrical shape. Bonded magnet 21 is integrally molded. As shown in FIG. 3, the back yoke 23 is attached to the outer peripheral side of the bonded magnet 21 after integral molding.

By attaching the back yoke 23 after integrally molding the rotor 20 of this embodiment, it is possible to select whether or not to add the back yoke 23 depending on the strength of the magnetic flux of the bonded magnets 21. In addition, by attaching the back yoke 23 after integrally molding the rotor 20, the disadvantages caused by integrally molding the bonded magnet 21 and the back yoke 23, such as not being able to successfully achieve polar anisotropic orientation (radial orientation), can be avoided. , can be avoided.

(4-2)
In the rotor 20 of this embodiment, the bonded magnets 21 are oriented polar anisotropically. As a result, the rotor 20 can reduce torque ripple.

(4-3)
The field element 20 of this embodiment is a rotor 20. The rotor 20 is arranged radially outward of the stator 10. The radial thickness Lm of the bonded magnet 21 and the arc length Ls of the radially inner magnetic pole surface per pole of the bonded magnet 21 satisfy Lm<Ls/2.

(4-4)
The field element 20 of this embodiment is a rotor 20. The rotor 20 is arranged radially outward of the stator 10. The radial thickness Lm of the bonded magnet 21, the arc length Ls of the radially inner magnetic pole surface per pole of the bonded magnet 21, and the radial thickness Ly of the back yoke 23 are as follows: Ly<Ls/2-Lm , satisfies.

(4-5)
In the rotor 20 of this embodiment, the back yoke 23 is a soft magnetic material tape. The soft magnetic material tape is fixed by adhering to the outer peripheral surface of the bonded magnet 21.

(4-6)
In the rotor 20 of this embodiment, the soft magnetic material tape is made of iron as a base material.

(4-7)
In the rotor 20 of this embodiment, the thickness of the soft magnetic material tape is 0.1 mm or more and 1.0 mm or less.

(4-8)
The motor 50 of this embodiment includes a rotor 20 and a stator 10. The stator 10 is arranged radially inside the rotor 20.

(4-9)
The air blower 70 of this embodiment includes a motor 50 and a fan 60. Fan 60 is driven by motor 50.

(4-10)
The air conditioner 100 of this embodiment includes an air blower 70.

(4-11)
In the method for manufacturing the rotor 20 of this embodiment, a bonded magnet 21 and a back yoke 23 are prepared. Bonded magnet 21 has a cylindrical shape. Bonded magnet 21 is integrally molded. In the method for manufacturing the rotor 20, the back yoke 23 is attached to the outer peripheral side of the bonded magnet 21.

(5) Modification (5-1) Modification 1A
In this embodiment, the back yoke 23 is a soft magnetic material tape based on iron. However, the back yoke 23 may be made of SPCC (Steel Plate Cold Commercial) or SPCE (Steel Plate Cold Deep Drawn Extra) as a base material. At this time, the back yoke 23 is drawn into a cylindrical shape and attached to the outer peripheral side of the bonded magnet 21.

Further, the back yoke 23 may be made of a non-oriented electromagnetic steel strip or a grain-oriented electromagnetic steel strip. At this time, the back yoke 23 is bent into a C-shape and attached to the outer peripheral side of the bonded magnet 21.

6 and 7 are diagrams showing an example of the C-shaped back yoke 23. 6 and 7 show an example of a motor 50 in which a bonded magnet 21 is provided at the end of a fan 60, and a C-shaped back yoke 23 is fixed to the bonded magnet 21. As shown in FIG. 6, the C-shaped back yoke 23 has an inner diameter slightly smaller than the outer diameter of the bonded magnet 21 at its natural length, and is fixed by tight fitting due to the spring restoring force when the C-shape expands. Good too. At this time, as shown in FIG. 7, the C-shaped back yoke 23 is fixed to the outer peripheral side of the bonded magnet 21. Further, the C-shaped back yoke 23 may be fixed to the outer circumferential side of the bonded magnet 21 with tape, with both circumferential ends joined. Further, the C-shaped back yoke 23 may be fixed by hooking hook portions provided at both circumferential ends on the outer circumferential side of the bonded magnet 21 to each other. Further, the C-shaped back yoke 23 may be fixed to the outer peripheral side of the bonded magnet 21 by overlapping and welding. Further, the C-shaped back yoke 23 may be fixed to the outer circumferential side of the bonded magnet 21 by overlapping and press-contacting it. Further, the C-shaped back yoke 23 may be fixed to the outer peripheral side of the bonded magnet 21 by superimposing and ultrasonically welding the same.

The C-shaped or cylindrical back yoke 23 may be fixed to the outer peripheral side of the bonded magnet 21 by overlapping and bonding. Further, the C-shaped or cylindrical back yoke 23 has a convex portion provided on the inner circumferential surface of the back yoke 23 and a recessed portion provided on the outer circumferential surface of the bonded magnet 21 on the outer circumferential side of the bonded magnet 21. It may be fixed by fitting. Further, the C-shaped or cylindrical back yoke 23 may be fixed to the outer peripheral side of the bonded magnet 21 by cold fitting in which the cooled bonded magnet 21 is covered with the back yoke 23 at room temperature. Further, the C-shaped or cylindrical back yoke 23 may be fixed to the outer peripheral side of the bonded magnet 21 by shrink fitting in which the heated back yoke 23 is placed over the bonded magnet 21 at room temperature. Further, the C-shaped or cylindrical back yoke 23 may be fixed to the outer peripheral side of the bonded magnet 21 by the magnetic force of the bonded magnet 21.

(5-2) Modification 1B
In the method for manufacturing the motor 50 of this embodiment, a cylindrical bonded magnet 21 and a back yoke 23 that are integrally molded are prepared. The back yoke 23 was attached to the outer peripheral side of the bonded magnet 21. However, in the manufacturing method of the motor 50, when a predetermined magnetic flux strength is obtained, the bonded magnet 21 is attached, and when the predetermined magnetic flux strength is not obtained, the back yoke 23 is attached to the outer circumferential side. A magnet 21 may also be attached.

As a result, the method for manufacturing the motor 50 can select whether or not to add the back yoke 23 depending on the strength of the magnetic flux of the bonded magnets 21.

(5-3) Modification example 1C
In this embodiment, the rotor 20 is used to drive the fan 60 in the blower device 70 of the indoor unit 110, which employs an outer rotor type motor. However, the rotor 20 may be used to drive a fan in a blower device of the outdoor unit 120, a blower device of an air cleaner, an electric fan, etc., in which an outer rotor type motor is employed.

(5-4)
Although the embodiments of the present disclosure have been described above, it will be understood that various changes in form and details can be made without departing from the spirit and scope of the present disclosure as described in the claims. .

10 Stator 20 Rotor (field element)
21 Bonded magnet 23 Back yoke (soft magnetic member)
50 Motor 60 Fan 70 Air blower 100 Air conditioner (refrigeration cycle device)

Patent No. 3306059

Claims (18)

an integrally molded cylindrical bonded magnet (21);
a soft magnetic member (23) attached to the outer peripheral side of the bonded magnet after integral molding;
Equipped with
Field magnet (20). the bonded magnet is polar anisotropically oriented;
The field element (20) according to claim 1. The field element is a rotor (20) arranged radially outside the stator,
The radial thickness Lm of the bonded magnet and the arc length Ls of the radially inner magnetic pole surface per pole of the bonded magnet satisfy Lm<Ls/2.
The field element (20) according to claim 2. The field element is a rotor (20) arranged radially outside the stator,
The radial thickness Lm of the bonded magnet, the arc length Ls of the radially inner magnetic pole surface per pole of the bonded magnet, and the radial thickness Ly of the soft magnetic member are such that Ly<Ls/2 -Lm, satisfies
The field element (20) according to claim 2. The soft magnetic member is a soft magnetic material tape,
The soft magnetic material tape is fixed by adhering to the outer peripheral surface of the bonded magnet.
A field element (20) according to any one of claims 1 to 4. The soft magnetic material tape is made of iron as a base material.
The field element (20) according to claim 5. The thickness of the soft magnetic material tape is 0.1 mm or more and 1.0 mm or less,
The field element (20) according to claim 5. The soft magnetic member is made of SPCC (Steel Plate Cold Commercial) or SPCE (Steel Plate Cold Deep Drawn Extra),
A field element (20) according to any one of claims 1 to 4. The soft magnetic member is based on a non-oriented electromagnetic steel strip or a grain-oriented electromagnetic steel strip,
A field element (20) according to any one of claims 1 to 4. The soft magnetic member is a C-shaped or cylindrical member,
A field element (20) according to any one of claims 1 to 4. The C-shaped soft magnetic member is arranged on the outer peripheral side of the bonded magnet.
fixed by a restoring force interference fit, or
Fixed with tape with both circumferential ends joined, or
Fixed by hooking hooks provided at both ends in the circumferential direction to each other, or
fixed by overlapping and welding, or
fixed by overlapping and pressing together, or
Fixed by overlapping and ultrasonic welding,
The field element (20) according to claim 10. The C-shaped or cylindrical soft magnetic member is arranged on the outer peripheral side of the bonded magnet,
fixed by overlapping and gluing, or
fixed by fitting a convex portion provided on the inner circumferential surface of the soft magnetic member and a concave portion provided on the outer circumferential surface of the bonded magnet, or
fixed by cold fitting in which the soft magnetic member at room temperature is placed over the cooled bonded magnet, or
Fixed by shrink fitting, in which the heated soft magnetic member is placed over the bonded magnet at room temperature, or
fixed by the magnetic force of the bonded magnet,
The field element (20) according to claim 10. The field element (20) according to any one of claims 1 to 4,
a stator (10) disposed radially inside the field element;
Equipped with
Motor (50). A motor (50) according to claim 13;
a fan (60) driven by the motor;
Equipped with
Air blower (70). A blower device (70) according to claim 14,
Equipped with
Refrigeration cycle device (100). an integrally molded cylindrical bonded magnet (21);
a soft magnetic member (23);
Prepare
attaching the soft magnetic member to the outer peripheral side of the bonded magnet;
Method for manufacturing a field element (20). an integrally molded cylindrical bonded magnet (21);
a soft magnetic member (23);
Prepare
When a predetermined magnetic flux strength is obtained, attach the bonded magnet,
When a predetermined magnetic flux strength cannot be obtained, attaching the bonded magnet with the soft magnetic member attached to the outer circumferential side;
Motor (50). an integrally molded cylindrical bonded magnet (21);
a soft magnetic member (23);
Prepare
When a predetermined magnetic flux strength is obtained, attach the bonded magnet,
When a predetermined magnetic flux strength cannot be obtained, attaching the bonded magnet with the soft magnetic member attached to the outer circumferential side;
A method for manufacturing a motor (50).