CN117501591A - Rotor, method for manufacturing same, and motor - Google Patents
Rotor, method for manufacturing same, and motor Download PDFInfo
- Publication number
- CN117501591A CN117501591A CN202280043233.2A CN202280043233A CN117501591A CN 117501591 A CN117501591 A CN 117501591A CN 202280043233 A CN202280043233 A CN 202280043233A CN 117501591 A CN117501591 A CN 117501591A
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- Prior art keywords
- rotor
- ferromagnetic powder
- magnet
- magnet arrangement
- arrangement holes
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- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 238000000034 method Methods 0.000 title claims description 8
- 239000000843 powder Substances 0.000 claims abstract description 63
- 230000005294 ferromagnetic effect Effects 0.000 claims abstract description 62
- 239000011347 resin Substances 0.000 claims abstract description 13
- 229920005989 resin Polymers 0.000 claims abstract description 13
- 239000000203 mixture Substances 0.000 claims abstract description 6
- 230000005291 magnetic effect Effects 0.000 claims description 39
- 239000011368 organic material Substances 0.000 claims description 4
- 230000004907 flux Effects 0.000 description 15
- 238000004804 winding Methods 0.000 description 11
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 239000000470 constituent Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 235000011837 pasties Nutrition 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
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- 239000005011 phenolic resin Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
Reducing the cogging torque of the rotor. The device is provided with: a rotor core (20) having a plurality of magnet arrangement holes (21); a rotation shaft (10) fixed to the rotor core (20); a plurality of permanent magnets (30); a plurality of ferromagnetic powder parts (31). The ferromagnetic powder part (31) is composed of a mixture of a ferromagnetic powder (31 a) and a resin (31 b). Each permanent magnet (30) of the plurality of permanent magnets (30) is in contact with one ferromagnetic powder portion (31) of the plurality of ferromagnetic powder portions (31). The plurality of magnet arrangement holes (21) each have a1 st inner surface (21 a) and a 2 nd inner surface (21 b) that are opposed in a predetermined rotation direction. The permanent magnets (30) are respectively arranged in the plurality of magnet arrangement holes (21). The plurality of ferromagnetic powder parts (31) are respectively arranged in the plurality of magnet arrangement holes (21). The permanent magnet (30) disposed in each of the plurality of magnet arrangement holes (21) is disposed so as to be in contact with the 1 st inner surface (21 a), and the ferromagnetic powder portion (31) is disposed so as to be in contact with the 2 nd inner surface (21 b).
Description
Technical Field
The present disclosure relates to a rotor used for various devices including household electrical devices and industrial devices, a method for manufacturing the same, and an electric motor.
Background
Motors are used for various electric devices such as household devices and industrial devices. As the motor, an IPM (Interior Permanent Magnet: interior permanent magnet) motor is known. The rotor of the IPM motor includes, for example: a rotor core; a permanent magnet disposed in each of a plurality of magnet arrangement holes provided in the rotor core; and a rotation shaft that is fixed to the center of the rotor core so as to penetrate the rotor core. In the IPM motor, a torque for rotating the rotor is generated by passing magnetic flux generated by permanent magnets of the rotor through the stator.
Conventionally, as such a motor, a spoke-type IPM motor having a rotor in which a plurality of magnet arrangement holes of a rotor core are radially provided is known (patent document 1). In the spoke type IPM motor, since the permanent magnet has a longer radial length than a circumferential length, the surface area of the permanent magnet can be increased. This can increase the magnetic flux of the permanent magnet that passes through the stator, that is, the magnetic flux of the permanent magnet contributing to the torque.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open publication No. 2017-46386
Disclosure of Invention
In the conventional rotor, a predetermined space may be provided between the rotor core and the permanent magnets in order to improve the insertion of the permanent magnets into the magnet arrangement holes. In this case, when the permanent magnet is inserted into the magnet arrangement hole, the permanent magnet is attracted to the inner surface of either one of the right and left sides (the right and left sides in the circumferential direction when viewed from the axial direction) of the magnet arrangement hole by the magnetic force. If the attraction positions of the permanent magnets are not uniform in the circumferential direction in the plurality of magnet arrangement holes, there is a problem in that the cogging torque becomes large because the variation in the magnetic flux density amount of the magnetic poles of each permanent magnet becomes large.
The present disclosure is made to solve the above-described problems, and an object thereof is to provide a rotor capable of reducing cogging torque, a method of manufacturing the rotor, and a motor.
The rotor according to claim 1 of the present disclosure includes: a rotor core having a plurality of magnet arrangement holes; a plurality of permanent magnets; a plurality of ferromagnetic powder portions; and a rotating shaft fixed to the rotor core. The ferromagnetic powder portion is composed of a mixture of ferromagnetic powder and resin. The plurality of magnet arrangement holes have a1 st inner surface and a 2 nd inner surface, respectively, the 1 st inner surface and the 2 nd inner surface being opposed in a prescribed rotational direction, and the 1 st inner surface being located on one side in the prescribed rotational direction and the 2 nd inner surface being located on the other side in the prescribed rotational direction. The plurality of permanent magnets are disposed in the plurality of magnet disposition holes, respectively. The plurality of ferromagnetic powders are respectively arranged in the plurality of magnet arrangement holes. The permanent magnet disposed in each of the plurality of magnet arrangement holes and the ferromagnetic powder portion are in contact with each other. The permanent magnet disposed in each of the plurality of magnet arrangement holes is in contact with the 1 st inner surface. The ferromagnetic powder portion disposed in each of the plurality of magnet arrangement holes is in contact with the 2 nd inner surface.
In the rotor of the 2 nd aspect of the present disclosure, on the basis of the 1 st aspect, the resin is an organic material having a crosslinked structure in a molecular structure.
In the method of manufacturing a rotor according to claim 3 of the present disclosure, the ferromagnetic powder portion according to claim 1 is attracted to each of the permanent magnets by its magnetic force, and then the permanent magnets and the ferromagnetic powder portion are inserted into the magnet arrangement holes.
The motor according to the 4 th aspect of the present disclosure includes: a rotor according to any one of aspects 1 and 2; and a stator that is disposed opposite to the rotor and generates a magnetic force acting on the rotor.
According to the present disclosure, a rotor capable of reducing cogging torque, a method of manufacturing the same, and a motor can be provided.
Drawings
Fig. 1 is a perspective view of a motor of an embodiment of the present disclosure.
Fig. 2 is a perspective view of a rotor of an electric motor of an embodiment of the present disclosure.
Fig. 3 is a top view of a main portion of a rotor of an electric motor of an embodiment of the present disclosure.
Fig. 4 is a cross-sectional view showing a method of manufacturing a rotor of an electric motor according to an embodiment of the present disclosure.
Detailed Description
Hereinafter, embodiments of the present disclosure will be described. The embodiments described below each represent a specific example of the present disclosure. Accordingly, numerical values, constituent elements, arrangement positions and connection forms of constituent elements, processes, order of processes, and the like shown in the following embodiments are examples, and are not intended to limit the present disclosure. Therefore, among the constituent elements in the following embodiments, the constituent elements not described in the independent claims showing the uppermost concepts of the present disclosure will be described as arbitrary constituent elements.
The drawings are schematic and are not necessarily strictly illustrated. In each of the drawings, the same reference numerals are given to the substantially same structures as those of the other drawings, and overlapping description is omitted or simplified.
(embodiment)
First, a schematic configuration of the motor 1 according to the embodiment will be described with reference to fig. 1. Fig. 1 is a perspective view of a motor 1 according to an embodiment.
As shown in fig. 1, the motor 1 includes a rotor 2 and a stator 3. The motor 1 of the present embodiment is an inner rotor type motor in which a rotor 2 is disposed inside a stator 3. That is, the stator 3 is configured to surround the rotor 2.
The rotor 2 is rotated by magnetic force generated from the stator 3. Specifically, the rotor 2 has a rotation shaft 10, and rotates about the axial center C of the rotation shaft 10.
The rotor 2 generates a magnetic force acting on the stator 3. The rotor 2 has such a structure that: a plurality of N poles and S poles, which become main magnetic fluxes, are repeatedly present in the circumferential direction. In the present embodiment, the direction of the main magnetic flux generated by the rotor 2 is a direction perpendicular to the direction of the shaft center C of the rotary shaft 10 (the rotary shaft direction). That is, the direction of the main magnetic flux generated by the rotor 2 is the radial direction (radial direction).
The rotor 2 is disposed with an air gap from the stator 3. Specifically, a minute air gap exists between the surface of the rotor 2 and the surface of the stator 3. The rotor 2 is a permanent magnet embedded rotor (IPM rotor) in which permanent magnets are embedded in an iron core, as will be described in detail later. Therefore, the motor 1 of the present embodiment is an IPM motor.
The stator 3 is disposed so as to oppose the rotor 2 across an air gap, and generates a magnetic force acting on the rotor 2. Specifically, the stator 3 is configured to surround the rotor core 20 of the rotor 2. The stator 3 constitutes a magnetic circuit together with the rotor 2.
The stator 3 is configured to alternately generate N-poles and S-poles as main magnetic fluxes in the circumferential direction on the air gap surface. In the present embodiment, the stator 3 has a stator core 3a (stator core) and a winding coil 3b (stator coil).
The stator core 3a is provided with a plurality of teeth 3a1 protruding toward the rotor core 20 of the rotor 2. Specifically, the plurality of teeth 3a1 are provided to protrude toward the axial center C of the rotary shaft 10. In addition, the plurality of teeth 3a1 are provided at equal intervals in the circumferential direction. Therefore, the plurality of teeth 3a1 extend radially in a direction (radial direction) orthogonal to the axial center C of the rotary shaft 10.
The stator core 3a is formed of, for example, a plurality of steel plates stacked in the direction of the axial center C of the rotary shaft 10. The plurality of steel sheets are, for example, electromagnetic steel sheets punched into a predetermined shape. The stator core 3a is not limited to a laminate of a plurality of steel plates, and may be a block made of a magnetic material.
The winding coil 3b is wound around each tooth 3a1 of the plurality of teeth 3a1 of the stator core 3 a. Specifically, the winding coil 3b is wound around each tooth 3a1 with an insulator interposed therebetween. Each winding coil 3b is composed of three-phase unit coils of U-phase, V-phase and W-phase, which are 120 degrees different in electric phase from each other. That is, the winding coil 3b wound around each tooth 3a1 is energized and driven by three-phase ac energized in each of the U-phase, V-phase, and W-phase units. Thereby, the main magnetic flux of the stator 3 is generated in each tooth 3a1.
The winding coil 3b is formed of a winding having a circular or rectangular cross section, and the winding is formed of a metal material such as copper having an insulating film formed on the surface thereof.
In the motor 1 configured as described above, when the winding coil 3b of the stator 3 is energized, an excitation current flows through the winding coil 3b to generate a magnetic field. Thereby, magnetic flux is generated from the stator 3 toward the rotor 2. On the other hand, magnetic flux toward the stator 3 is generated in the rotor 2. That is, magnetic flux passing through the stator 3 is generated by the permanent magnets of the rotor 2. The magnetic force generated by the interaction between the magnetic flux generated by the stator 3 and the magnetic flux generated by the rotor 2 becomes torque for rotating the rotor 2, and the rotor 2 rotates around the rotation shaft 10.
Next, the detailed structure of the rotor 2 according to the present embodiment will be described with reference to fig. 1, and with reference to fig. 2 and 3. Fig. 2 is a perspective view of the rotor 2 according to the embodiment. Fig. 3 is a plan view of a main portion of the rotor 2 of the embodiment. In fig. 2 and 3, the rotary shaft 10 is omitted.
As shown in fig. 1 to 3, the rotor 2 includes a rotary shaft 10, a rotor core 20, and a plurality of permanent magnets 30.
The rotation shaft 10 is a long shaft that becomes the center of rotation of the rotor 2. The rotary shaft 10 is, for example, a metal rod, and is fixed to the center of the rotor 2. Specifically, the rotary shaft 10 is fixed to the rotor core 20. In the present embodiment, the rotary shaft 10 is fixed to the rotor core 20 so as to protrude from both sides of the rotor 2 and so as to penetrate the center of the rotor core 20. The rotary shaft 10 is fixed to the rotor core 20 by press-fitting or heat press-fitting into a through hole 20a formed in the center of the rotor core 20.
Although not shown, the 1 st part of the rotary shaft 10 protruding toward one side of the rotor 2 is supported by the 1 st bearing, and the 2 nd part of the rotary shaft 10 protruding toward the other side of the rotor 2 is supported by the 2 nd bearing. A load driven by the motor 1 is mounted on the 1 st or 2 nd position of the rotary shaft 10.
The rotor core 20 (rotor core) is formed of, for example, a plurality of steel plates stacked in the direction of the axial center C of the rotary shaft 10. The plurality of steel plates are, for example, electromagnetic steel plates punched into a predetermined shape, and are fixed to each other by caulking (japanese (koku shi)) or the like. The rotor core 20 is not limited to a laminate of a plurality of steel plates, and may be a block made of a magnetic material.
The rotor core 20 is a core having a plurality of magnet arrangement holes 21. The plurality of magnet arrangement holes 21 are magnet arrangement holes in which the permanent magnets 30 are arranged. Specifically, the permanent magnet 30 is inserted into the magnet arrangement hole 21. That is, the magnet arrangement hole 21 is a magnet insertion hole into which the permanent magnet 30 is inserted. One permanent magnet 30 is inserted into each magnet arrangement hole 21. As an example, the rotor 2 is a 10-pole rotor having a pole number of 10. Therefore, 10 magnet arrangement holes 21 and 10 permanent magnets 30 are provided in the rotor core 20. The present invention is not limited to this, and other numbers of poles can be applied.
In the present embodiment, the magnet arrangement hole 21 is a through hole penetrating the rotor core 20 in the direction of the axial center C of the rotary shaft 10. Therefore, the cross-sectional shape of the magnet arrangement hole 21 is the same in the direction of the axial center C of the rotary shaft 10 in any cross-section cut by a plane orthogonal to the rotary shaft 10. That is, the magnet arrangement holes 21 of the same shape are formed in all the steel plates constituting the rotor core 20. The magnet arrangement holes 21 may be not through holes as long as the permanent magnets 30 can be arranged.
As shown in fig. 1 and 2, the plurality of magnet arrangement holes 21 are radially provided around the rotation shaft 10. In addition, the plurality of magnet arrangement holes 21 are provided at equal intervals along the circumferential direction of the rotor core 20 (the rotation direction of the rotary shaft 10). The plurality of magnet arrangement holes 21 extend in the radial direction of the rotor core 20 (the direction orthogonal to the direction of the axial center C of the rotary shaft 10) in a plan view. That is, the magnet arrangement holes 21 are elongated in the radial direction of the rotor core 20, and have a longer radial length than the length in the rotation direction (circumferential direction). The magnet arrangement holes 21 may be elongated in the rotation direction (circumferential direction) of the rotor core 20, and the length in the rotation direction (circumferential direction) may be longer than the radial length.
The plurality of elongated magnet arrangement holes 21 are formed in spoke shape around the rotation shaft 10. That is, the rotor 2 is a spoke type IPM rotor, and the motor 1 is a spoke type IPM motor. In the present embodiment, each of the magnet arrangement holes 21 has a substantially rectangular shape in plan view, with the radial direction of the rotor core 20 being the longitudinal direction. In addition, the shape of each of the plurality of magnet arrangement holes 21 in plan view is identical to each other.
As shown in fig. 2, the permanent magnets 30 are inserted into the respective magnet arrangement holes 21 of the rotor 2 along the axial direction C of the rotary shaft 10, and the permanent magnets 30 are arranged in the respective magnet arrangement holes 21. In the present embodiment, the permanent magnet 30 is inserted from above (above the paper surface) the axial center C of the rotary shaft 10, but the permanent magnet 30 may be inserted from below (above the paper surface).
In the present embodiment, the permanent magnet 30 is, for example, a sintered magnet. The plurality of permanent magnets 30 are arranged such that the direction of the magnetic poles is the circumferential direction of the rotor core 20 (the rotation direction of the rotary shaft 10). That is, the direction in which the permanent magnets 30 are magnetized to magnetic poles is the circumferential direction of the rotor core 20. In addition, the magnetic pole directions of the S pole and the N pole of the adjacent two permanent magnets 30 are opposite directions.
The top view shape of the permanent magnet 30 is substantially the same as the top view shape of the magnet arrangement hole 21, and the size of the permanent magnet 30 is slightly smaller than the magnet arrangement hole 21. The permanent magnet 30 is fitted into the magnet arrangement hole 21. The permanent magnet 30 has a substantially rectangular shape in a long form in plan view. As an example, permanent magnet 30 is a plate-like rectangular parallelepiped having a thickness in a direction orthogonal to the radial direction of rotor core 20. The permanent magnet 30 may be divided into a plurality of pieces.
In each of the magnet arrangement holes 21, a gap (space, clearance) of a certain size exists between the outer surface of the permanent magnet 30 and the inner surface of the magnet arrangement hole 21. An adhesive for adhesively fixing the permanent magnet 30 to the magnet arrangement hole 21 may be provided in the gap. On the other hand, the adhesive may not be provided in the gap.
The permanent magnet 30 is composed of, for example, an nd—fe—b sintered magnet or a ferrite sintered magnet. Alternatively, the bonded magnet may be formed of a magnetic powder such as nd—fe—b based magnet powder or ferrite based magnet powder, a resin material, a small amount of an additive, or the like.
In addition, the permanent magnet 30 is magnetized in advance before the permanent magnet 30 is inserted into the magnet arrangement hole 21.
The permanent magnet 30 may be covered with a covering material made of resin to form a covering layer 30a, thereby covering the periphery of the permanent magnet 30. In addition, the coating layer 30a may not be required.
As shown in fig. 3, each of the magnet arrangement holes 21 is provided with 1 st and 2 nd inner surfaces 21a and 21b which are two inner surfaces facing each other in the circumferential direction (the rotation direction of the rotary shaft 10) in plan view. The 1 st inner surface 21a is an inner surface located on one side in a predetermined rotational direction, and the 2 nd inner surface 21b is an inner surface located on the other side in the predetermined rotational direction. The predetermined rotation direction is a normal rotation direction or a reverse rotation direction in the case of bidirectional rotation. For example, in fig. 3, when the predetermined rotation direction is counterclockwise, the 1 st inner surface 21a is an inner surface located on the front side in the rotation direction, and the 2 nd inner surface 21b is an inner surface located on the rear side in the rotation direction. In any rotational direction, the relative positional relationship between the 1 st inner surface 21a (the inner surface in contact with the permanent magnet 30) and the 2 nd inner surface 21b (the inner surface in contact with the ferromagnetic body 31) in the rotational direction is the same in all the magnet arrangement holes 21. The permanent magnet 30 is disposed in contact with the 1 st inner surface 21 a. The ferromagnetic powder portion 31 is disposed in contact with the 2 nd inner surface 21b at a gap between the outer surface of the permanent magnet 30 and the 2 nd inner surface 21b of the magnet disposition hole 21. That is, each of the magnet arrangement holes 21 is occupied by the permanent magnet 30 and the ferromagnetic powder portion 31 in the rotation direction, and the permanent magnet 30 and the ferromagnetic powder portion 31 are arranged to be in contact with each other.
The ferromagnetic powder portion 31 is inserted along the axial direction C of the rotary shaft 10 together with the permanent magnet 30 in a state of being attracted to the permanent magnet 30, and the ferromagnetic powder portion 31 is disposed in each of the plurality of magnet disposition holes 21.
In each of the magnet arrangement holes 21, the permanent magnet 30 is arranged and fixed to the 1 st inner surface 21a (left side in the drawing) and the ferromagnetic powder portion 31 is arranged and fixed to the 2 nd inner surface 21b (right side in the drawing) in the rotation direction.
The ferromagnetic powder portion 31 includes ferromagnetic powder 31a made of ferromagnetic material such as iron, nickel, cobalt, or an alloy thereof, or ferrite. The relative dielectric constant of the ferromagnetic powder 31a is preferably 1.5 or less. The particle diameter of the ferromagnetic powder 31a is, for example, 0.2mm or less.
The ferromagnetic powder portion 31 is a mixture of a plurality of the above ferromagnetic powders 31a and a resin 31b made of an organic material having a crosslinked structure in a molecular structure. Specifically, the resin 31b is an epoxy resin, an acrylic resin, a phenolic resin, or the like. By using these materials, the ferromagnetic powders 31a can be firmly bonded to each other.
In the present embodiment, first, the ferromagnetic powder portion 31 is formed by using a mixture of the ferromagnetic powder 31a and the resin 31 b.
Then, the ferromagnetic powder portion 31 is attracted to each permanent magnet 30 by its magnetic force. At this time, the ferromagnetic powder portion 31 is formed on one surface of the permanent magnet 30. The ferromagnetic powder portion 31 may be pasty, and is solidified after being adsorbed to the permanent magnet 30.
Thereafter, as shown in fig. 4, each permanent magnet 30 having the ferromagnetic powder portion 31 adsorbed thereto is inserted into the magnet arrangement hole 21. At this time, in each of the magnet arrangement holes 21, the permanent magnet 30 is arranged and fixed on the 1 st inner surface 21a side (left side in the drawing) and the ferromagnetic powder portion 31 is arranged and fixed on the 2 nd inner surface 21b side (right side in the drawing) in the rotation direction.
In this way, since the ferromagnetic powder portion 31 is inserted into the magnet arrangement hole 21 after being attracted to the permanent magnet 30, productivity is improved as compared with the case where the ferromagnetic powder portion 31 is inserted after the permanent magnet 30 is inserted into the magnet arrangement hole 21.
By configuring as described above, the permanent magnet 30 inserted into each of the magnet arrangement holes 21 is easily fixed to one side surface (left side in the drawing) in the circumferential direction (rotational direction) within each of the magnet arrangement holes 21.
Further, since each magnet arrangement hole 21 is occupied by the permanent magnet 30 and the ferromagnetic powder portion 31 in the rotation direction, each permanent magnet 30 is fixed and attracted to the 1 st inner surface 21a in the circumferential direction (rotation direction) without fail, and the permanent magnet 30 can be prevented from moving from its arrangement position.
Therefore, the variation in the suction position of the permanent magnet 30 in each magnet arrangement hole 21 can be suppressed. As a result, the following advantages can be obtained: the variation in the magnetic flux density amount of each permanent magnet 30 can be reduced, and the cogging torque can be prevented from becoming large.
Further, since the permanent magnets 30 and the ferromagnetic powder portions 31 are disposed so as to be in contact with each other, the whole of the permanent magnets 30 and the ferromagnetic powder portions 31 together functions as one magnet, and one N pole and one S pole are formed at both ends in the rotation direction. That is, it can be considered that the magnet is increased by an amount corresponding to the ferromagnetic powder portion 31. As a result, the distance between the N pole and the S pole becomes longer accordingly.
Here, the magnetic field on the opposite side exists inside the magnet, and when the temperature is high, the magnetic field appearing outside is weakened due to the demagnetizing field of the magnet itself. On the other hand, the farther the N pole is from the S pole, the weaker the (counter) magnetic field inside the magnet. That is, the more the magnet is in a shape in which the N pole and the S pole are apart from each other, the more heat-resistant the magnet is (even at high temperature, the magnetic field appearing outside is not weakened).
In the permanent magnet 30 of the present embodiment, the N pole and the S pole are separated by an amount corresponding to the ferromagnetic powder portion 31, and therefore, even at high temperatures, the magnetic field appearing outside is not weakened.
On the other hand, even if a high magnetic permeability material is used instead of the ferromagnetic powder portion 31, the distance between the N pole and the S pole does not increase, and when the temperature is high, the magnetic field appearing outside becomes weak.
The above-described embodiment is merely an example, and the present disclosure is not limited thereto, and can be appropriately modified. For example, part of the structure of the above embodiment may be replaced with a known other structure. In addition, the structure not mentioned in the above embodiment is arbitrary, and for example, a known structure can be appropriately selected to be combined with the present disclosure.
(embodiment)
Embodiments of the present disclosure are described below.
The rotor (2) according to claim 1 of the present disclosure includes: a rotor core (20) having a plurality of magnet arrangement holes (21); a rotation shaft (10) fixed to the rotor core (20); a plurality of permanent magnets (30); a plurality of ferromagnetic powder parts (31). The ferromagnetic powder part (31) is composed of a mixture of a ferromagnetic powder (31 a) and a resin (31 b). The plurality of magnet arrangement holes (21) each have a1 st inner surface (21 a) and a 2 nd inner surface (21 b) that are opposed in a predetermined rotation direction. The plurality of permanent magnets (30) are respectively arranged in the plurality of magnet arrangement holes (21). The plurality of ferromagnetic powder parts (31) are respectively arranged in the plurality of magnet arrangement holes (21). The permanent magnet (30) disposed in each of the plurality of magnet arrangement holes (21) and the ferromagnetic powder portion (31) are in contact with each other. The permanent magnet (30) disposed in each of the plurality of magnet arrangement holes (21) is disposed so as to be in contact with the 1 st inner surface (21 a), and the ferromagnetic powder portion (31) is disposed so as to be in contact with the 2 nd inner surface (21 b).
In the rotor (2) according to claim 2 of the present disclosure, in addition to claim 1, the resin is an organic material having a crosslinked structure in a molecular structure.
In the method for manufacturing the rotor (2) according to claim 3 of the present disclosure, the ferromagnetic powder portion (31) according to claim 1 is magnetically attracted to each of the permanent magnets (30), and then the permanent magnets (30) and the ferromagnetic powder portion (31) are inserted into the magnet arrangement holes (21).
The motor (1) according to the 4 th aspect of the present disclosure includes: a rotor (2) according to any one of the first to second aspects (1) and (2); and a stator (3) which is disposed so as to face the rotor (2) and generates a magnetic force acting on the rotor (2).
Industrial applicability
The rotor and the motor of the present disclosure can be widely used for motors and the like used for various devices including household electrical devices and industrial devices.
Description of the reference numerals
1. A motor; 2. a rotor; 3. a stator; 3a, a stator core; 3a1, teeth; 3b, winding coil; 10. a rotation shaft; 20. a rotor core; 21. a magnet arrangement hole; 21a, 1 st inner surface; 21b, 2 nd inner surface; 30. a permanent magnet; 30a, a coating layer; 31. a ferromagnetic powder portion; 31a, a ferromagnetic powder; 31b, resin.
Claims (4)
1. A rotor, wherein,
the rotor is provided with:
a rotor core having a plurality of magnet arrangement holes;
a plurality of permanent magnets;
a plurality of ferromagnetic powder portions; and
a rotation shaft fixed to the rotor core,
the ferromagnetic powder part is composed of a mixture of ferromagnetic powder and resin,
the plurality of magnet arrangement holes have a1 st inner surface and a 2 nd inner surface, respectively, the 1 st inner surface and the 2 nd inner surface being opposed in a prescribed rotational direction, and the 1 st inner surface being located on one side in the prescribed rotational direction, the 2 nd inner surface being located on the other side in the prescribed rotational direction,
the plurality of permanent magnets are respectively arranged in the plurality of magnet arrangement holes, the plurality of ferromagnetic powders are respectively arranged in the plurality of magnet arrangement holes,
the permanent magnet disposed in each of the plurality of magnet arrangement holes is in contact with the ferromagnetic powder portion, the permanent magnet disposed in each of the plurality of magnet arrangement holes is in contact with the 1 st inner surface, and the ferromagnetic powder portion disposed in each of the plurality of magnet arrangement holes is disposed in contact with the 2 nd inner surface.
2. The rotor according to claim 1, wherein,
the resin is an organic material having a crosslinked structure in a molecular structure.
3. A method for manufacturing a rotor, wherein,
in this method for manufacturing a rotor, the ferromagnetic powder portion according to claim 1 is attracted to the permanent magnet by its magnetic force, and then the permanent magnet and the ferromagnetic powder portion are inserted into the magnet arrangement hole.
4. An electric motor, wherein,
the motor is provided with: the rotor of claim 1 or 2; and a stator that is disposed opposite to the rotor and generates a magnetic force acting on the rotor.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021-108266 | 2021-06-30 | ||
| JP2021108266 | 2021-06-30 | ||
| PCT/JP2022/021824 WO2023276513A1 (en) | 2021-06-30 | 2022-05-27 | Rotor, method for manufacturing same, and electric motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117501591A true CN117501591A (en) | 2024-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202280043233.2A Pending CN117501591A (en) | 2021-06-30 | 2022-05-27 | Rotor, method for manufacturing same, and motor |
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| Country | Link |
|---|---|
| JP (1) | JPWO2023276513A1 (en) |
| CN (1) | CN117501591A (en) |
| WO (1) | WO2023276513A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001025191A (en) * | 1999-07-05 | 2001-01-26 | Nissan Motor Co Ltd | Rotor of motor and manufacture thereof |
| JP6383745B2 (en) * | 2016-03-10 | 2018-08-29 | 本田技研工業株式会社 | Manufacturing method of rotor of rotating electrical machine and rotor of rotating electrical machine |
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2022
- 2022-05-27 CN CN202280043233.2A patent/CN117501591A/en active Pending
- 2022-05-27 WO PCT/JP2022/021824 patent/WO2023276513A1/en active Application Filing
- 2022-05-27 JP JP2023531716A patent/JPWO2023276513A1/ja active Pending
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| Publication number | Publication date |
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| WO2023276513A1 (en) | 2023-01-05 |
| JPWO2023276513A1 (en) | 2023-01-05 |
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