WO2014162804A1 - 永久磁石埋め込み式回転電機 - Google Patents
永久磁石埋め込み式回転電機 Download PDFInfo
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- WO2014162804A1 WO2014162804A1 PCT/JP2014/055225 JP2014055225W WO2014162804A1 WO 2014162804 A1 WO2014162804 A1 WO 2014162804A1 JP 2014055225 W JP2014055225 W JP 2014055225W WO 2014162804 A1 WO2014162804 A1 WO 2014162804A1
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- Prior art keywords
- rotor
- permanent magnet
- embedded
- intermediate plate
- hole
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- 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
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2746—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets arranged with the same polarity, e.g. consequent pole type
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- 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
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K16/00—Machines with more than one rotor or stator
- H02K16/02—Machines with one stator and two or more rotors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/03—Machines characterised by aspects of the air-gap between rotor and stator
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/12—Machines characterised by the modularity of some components
Definitions
- the present invention relates to a rotating electrical machine having a rotor, such as an electric motor or a generator, and more particularly to a permanent magnet embedded rotating electrical machine in which a permanent magnet is embedded in a rotor.
- FIG. 7 (a) and 7 (b) are cross-sectional views showing a configuration of a rotor of an IPM motor which is an example of a conventional permanent magnet embedded rotary electric machine, and FIG. 7 (c) shows an outer peripheral surface thereof.
- FIG. This conventional IPM motor is disclosed in Patent Document 1.
- This IPM motor has two permanent magnets 13 a and 13 b arranged in a V shape so as to spread toward the outside of the rotor 10, and the two permanent magnets 13 a and 13 b are arranged inside the rotor 10. A plurality of poles are formed by embedding a plurality of sets.
- the rotor 10 includes a laminated steel plate 11 shown in FIG. 7 (a) and a laminated steel plate 12 shown in FIG. 7 (b) alternately one by one as shown in FIG. It is constructed by stacking.
- the laminated steel plate 11 is formed with two holding holes 18a and 18b, two cavities 14a and 14b, and two cavities 15a and 15b as one pole. A plurality of these are formed. Specifically, as one pole portion, it is arranged in a V shape and is a portion between the two holding hole portions 18a and 18b holding the two permanent magnets 13a and 13b and the two holding hole portions 18a and 18b. (V-shaped central portion) and disposed in the portion (V-shaped end portion) between the two hollow portions 14a and 14b communicating with the holding hole portions 18a and 18b, respectively, and the adjacent other poles. Two hollow portions 15a and 15b communicating with the holding hole portions 18a and 18b are formed.
- the holding hole 18a, the cavity 14a, and the cavity 15a are one continuous region (hole), and the holding hole 18b, the cavity 14b, and the cavity 15b are also one continuous region (hole).
- each may be punched as one hole.
- the side bridges 19a and 19b are formed on the outer edges of the cavities 15a and 15b.
- the laminated steel sheet 12 has two holding holes 18a ′ and 18b ′, two cavities 14a ′ and 14b ′, and two notches as one pole. 16a and 16b are formed, and a plurality of these are formed.
- the holding hole portions 18a 'and 18b' and the cavity portions 14a 'and 14b' in the laminated steel plate 12 are the same as the holding hole portions 18a and 18b and the cavity portions 14a and 14b in the laminated steel plate 11, respectively.
- two holding holes 18a 'and 18b' that hold the two permanent magnets 13a and 13b and two holding holes 18a 'and 18b' are arranged as one pole.
- the two cutout portions 16 a and 16 b are arranged and communicate with the holding hole portions 18 a ′ and 18 b ′ and communicate with the outer edge of the laminated steel plate 12.
- Each notch part 16a, 16b is arrange
- the holding hole 18a ′, the cavity 14a ′, and the notch 16a are one continuous region (notch), and the holding hole 18b ′, the cavity 14b ′, and the notch 16b are also continuous.
- One region (notch) is formed, and each of the laminated steel plates 12 may be punched out as one notch at the time of punching.
- the outer peripheral surface of the rotor 10 has the appearance shown in FIG. 7C, and the notches 16a and 16b are arranged in rows. Every other steel plate is arranged.
- the laminated steel plates 11 and the laminated steel plates 12 are alternately laminated, and in the laminated steel plate 12, the magnetic flux passes through the notches 16a and 16b. Even if the widths 19a and 19b are not narrowed, the magnetic short circuit can be reduced.
- the laminated steel plate 12 has the notches 16a and 16b, the total cross-sectional area obtained by adding up the cross-sectional areas of the iron core between the permanent magnet and the rotor outer peripheral surface in each steel plate (that is, the side bridges 19a and 19b). The total cross-sectional area obtained by summing up the cross-sectional areas of the portions becomes 1/2, and as a result, magnetic short-circuiting is reduced.
- the magnetic resistance in the notches 16a and 16b is changed to the magnetic resistance in the side bridges 19a and 19b. It can be larger than the resistance.
- the laminated steel plate 11 and the laminated steel plate 12 are laminated
- the iron core is present in the passing portion of the d-axis magnetic flux and the q-axis magnetic flux, a desired reluctance torque can be maintained.
- the width of the side bridges 19a and 19b is determined by the presence of the notches 16a and 16b.
- the magnetic resistance can be increased and magnetic flux leakage can be suppressed while ensuring a predetermined width.
- the rotor rotating shaft may be horizontal and the rotor may be placed directly on the floor. At that time, there is a problem that stress concentrates on the center bridge and the rotor may be damaged.
- the present invention has been made in view of the circumstances as described above, and an object thereof is to provide a permanent magnet embedded type rotating electrical machine provided with means for protecting a rotor from breakage.
- the present invention relates to a permanent magnet embedded electric motor in which a single pole is constituted by two permanent magnets, and a permanent magnet having a plurality of poles is embedded in the rotor, and a disk shape having a substantially circular outer periphery in the middle of the rotor steel in the axial direction of the rotor.
- a permanent magnet embedded rotating electrical machine in which one or a plurality of intermediate plates are arranged.
- the rotor is supported by the intermediate plate when the rotor rotation shaft is horizontal and the rotor is directly placed on the floor in the rotor manufacturing process. Therefore, it is possible to prevent a large stress from being applied to each part of the rotor during manufacturing of the rotating electrical machine, and to protect the rotor from breakage.
- a magnet embedding hole for accommodating the permanent magnet in the rotor steel material communicates with the outer periphery of the rotor.
- the magnet embedding hole communicates with the outer periphery of the rotor, and since there is no side bridge, only the center bridge supports the region outside the center bridge in the centrifugal direction in the rotor.
- the rotor since the rotor has an intermediate plate, the rotor is supported by the intermediate plate when the rotor rotation axis is horizontal and the rotor is placed directly on the floor in the rotor manufacturing process, and the stress applied to the center bridge is alleviated. can do.
- the outer diameter of the intermediate plate is larger than the outer diameter of the rotor steel material.
- the intermediate plate is made of a metal material, more preferably a metal material mainly composed of iron. Since this material is excellent in elasticity and toughness, the intermediate plate itself can be protected from damage, and the rotor can be protected from damage.
- a nonmagnetic film is formed on the surface of the intermediate plate. According to this aspect, magnetic flux leakage can be suppressed.
- the nonmagnetic film is nonconductive. According to this aspect, eddy current can be prevented and the rotor can be prevented from overheating.
- a nonmagnetic thin plate may be disposed adjacent to the intermediate plate in the rotor axial direction.
- the nonmagnetic thin plate may be nonconductive.
- the intermediate plate does not have holes other than holes for passing through the shaft of the rotor. According to this aspect, the intermediate plate can be made very strong.
- the intermediate plate has a hole having a shape or a size different from that of the magnet embedding hole, and at least a part of the region in the hole is opposed to an area in the magnet embedding hole of the rotor steel material.
- the hole provided in the intermediate plate is a hole having a shape and a size capable of inserting a permanent magnet embedded in the magnet embedding hole.
- the permanent magnet can be moved in the rotor rotation axis direction. Therefore, depending on the structure of the rotor, the assembly of the rotor may be simplified.
- the hole provided in the intermediate plate includes a part of the permanent magnet embedded in the magnet embedding hole, and the shape and size of the remaining part of the permanent magnet protruding from the hole. It is a hole to have.
- the intermediate plate serves as a detent for the permanent magnet in the rotor rotation axis direction. Therefore, depending on the structure of the rotor, the assembly of the rotor may be simplified.
- FIG. 1 is a longitudinal sectional view showing a configuration of a permanent magnet embedded rotary electric machine according to a first embodiment of the present invention. It is a perspective view which shows the structure of the rotor in the same embodiment. It is a front view which shows the structure of the rotor in the same embodiment. It is a perspective view which shows the structure of the rotor in 2nd Embodiment of this invention. It is a front view which shows the structure of the rotor in the same embodiment. It is a front view which shows the structure of the rotor in 3rd Embodiment of this invention. It is a figure which shows the structure of the rotor of the conventional permanent magnet embedding type rotary electric machine.
- FIG. 1 is a longitudinal sectional view showing the overall configuration of a permanent magnet embedded rotary electric machine according to a first embodiment of the present invention.
- a frame 1 is a casing that covers the entire permanent magnet embedded rotary electric machine, and is made of iron, aluminum, stainless steel, or the like.
- a hollow cylindrical fixed-side iron core 2 is provided on the inner side of the frame 1.
- the fixed iron core 2 is formed by laminating silicon steel plates.
- the fixed iron core 2 is provided with a hole, and a stator winding made of a copper wire or the like is inserted into the hole (not shown).
- a rotor 3 that is a rotating side iron core is inserted inside the fixed side iron core 2 with a predetermined gap between the fixed side iron core 2 and the fixed side iron core 2.
- the rotor 3 is formed by laminating silicon steel plates.
- the rotor 3 may be configured by cutting a simple iron block.
- the rotor 3 has a shaft 4 made of iron or the like passing through the center thereof. Ideally, the center axis of the shaft 4 is the rotation center axis 4 a of the rotor 3.
- the shaft 4 is supported by shields 6 provided at both front and rear ends of the frame 1 via rolling bearings 5 made of bearing steel or the like.
- the permanent magnet embedded rotary electric machine is a motor.
- the rotor 3 is energized by a rotating magnetic field created by a stator winding (not shown), and rotates around the rotation center axis 4a.
- FIG. 2 is a perspective view showing a configuration of the rotor 3 in the present embodiment.
- FIG. 3 is a front view of the rotor 3 viewed from the direction of the rotation center axis 4a. 2 and 3 show the configuration of the rotor 3 in a state where a part thereof is cut off by two planes orthogonal to the rotation center axis 4a in order to facilitate understanding of the configuration of the rotor 3.
- the rotor 3 includes a core 31 near the rotation center shaft 4a, two permanent magnets 34a and 34b provided for each pole, and a rotor outside the permanent magnets 34a and 34b as viewed from the rotation center shaft 4a. It can be roughly divided into an outer peripheral edge 33 of each pole made of steel, a center bridge 32 of each pole connecting the core 31 and the outer peripheral edge 33, and a q-axis protrusion 37 provided between the poles. .
- the outer peripheral edge portion 33 for one pole has a substantially arc-shaped cross-sectional shape, and is connected to the core portion 31 via the center bridge 32 at the center in the rotor rotation direction.
- the outer peripheral surface of the outer peripheral edge portion 33 has a radius of curvature smaller than the distance from the rotation center shaft 4a to the outermost peripheral portion of the rotor. This is because the harmonic component of the torque is reduced by making the outer peripheral edge portion 33 in such a shape by the magnetic field calculation by the inventors of the present application, and the fundamental wave of the torque generated in the rotor 3 by the reduced amount. It is because it became clear that a component increases. In this way, the radius of curvature of a part of the outer peripheral edge 33 instead of the entire outer peripheral edge 33 may be made smaller than the distance from the rotation center shaft 4a to the outermost peripheral part of the rotor.
- a magnet embedded hole 35a for holding the permanent magnet 34a and a magnet embedded hole 35b for holding the permanent magnet 34b are provided inside the outer peripheral edge 33.
- the magnet embedding holes 35 a and 35 b are surrounded from three directions by the outer peripheral edge portion 33, the center bridge 32, and the core portion 31.
- the outer peripheral edge 33 supports the permanent magnets 34a and 35b on the side of the rotation center shaft 4a against the centrifugal force acting on the permanent magnets 34a and 34b when the rotor 3 rotates.
- Each outer peripheral edge portion 33 corresponding to each pole is arranged in the rotor rotating direction with a gap between adjacent ones.
- the gap between the two outer peripheral edge portions 33 is located at the center between the poles.
- the magnet embedding holes 35 a and 35 b communicate with the outer periphery of the rotor through a gap between the two outer peripheral edge portions 33.
- the magnet embedding holes 35a and 35b are arranged in an inverted V shape. And the area
- the q-axis protrusion 37 passes through the gap between the two outer peripheral edge portions 33 at the center position between the poles of the core portion 31, and protrudes in the centrifugal direction (the direction away from the rotation center shaft 4a).
- Positioning protrusions 38a and 38b for restricting the movement of the permanent magnets 34a and 34b toward the q-axis protrusion 37 are provided in the magnet embedding holes 35a and 35b.
- the positioning projections 38a and 38b are regions on the outer side in the rotor radial direction as viewed from the permanent magnets 34a and 34b on the inner walls of the magnet embedding holes 35a and 35b, that is, the end on the q-axis projection 37 side inside the outer peripheral edge 33.
- the projection protrudes toward the rotation center axis 4a.
- the permanent magnets 34a and 34b are pressed against the positioning protrusions 38a and 38b and fixed in the magnet embedding holes 35a and 35b.
- an adhesive is used to assist in fixing the permanent magnets 34a and 34b to the magnet embedding holes 35a and 35b.
- the rotor 3 has a disk-shaped intermediate plate 300 whose outer periphery is generally circular at one or a plurality of positions (three locations in the illustrated example) along the rotor axial direction.
- the thickness of the rotor steel plate divided by the intermediate plate 300 in the rotor rotation axis direction is sufficiently larger than the thickness of the intermediate plate 300.
- the intermediate plate 300 does not have holes other than holes for allowing the shaft 4 to pass therethrough.
- the outer diameter of the intermediate plate 300 is larger than the outer diameter of the steel material of the rotor 3.
- the intermediate plate 300 is made of a metal material. More specifically, the intermediate plate 300 is made of a metal material mainly composed of iron, such as steel or stainless steel.
- the intermediate plate 300 having a surface formed with a nonmagnetic film is used.
- the nonmagnetic film formed on the intermediate plate 300 is nonconductive.
- a nonmagnetic thin plate may be disposed on both sides of the intermediate plate 300 in the rotor axial direction.
- the nonmagnetic thin plate may be nonconductive.
- the rotor 3 in this embodiment has a configuration in which the magnet embedding holes 35a and 35b communicate with the outer periphery of the rotor.
- This configuration has one feature of the present embodiment. Hereinafter, the reason why this configuration is adopted will be described.
- a rotor in order to achieve both the purpose of reducing the leakage magnetic flux and the purpose of ensuring the strength of the rotor, a rotor is configured by combining a rotor steel plate with a side bridge and a rotor steel plate without a side bridge. It was. For this reason, the conventional rotor has problems such as an increase in manufacturing cost.
- a configuration in which the magnet embedding holes 35a and 35b communicate with the outer periphery of the rotor that is, a configuration without a side bridge in the conventional example is adopted as the configuration of the rotor.
- the rotor does not have a side bridge on the outermost periphery, no assembly residual stress remains on the outermost periphery of the rotor.
- the stress generated by the centrifugal force during the rotation of the rotor is concentrated on the center bridge, but the stress acting on the center bridge is a tensile stress.
- the magnet embedding holes 35a and 35b are arranged in an inverted V shape, no residual stress remains in the vicinity of the center bridge.
- the rotor configuration in which the magnet embedding holes 35a and 35b communicate with the outer periphery of the rotor provides the following significant advantages.
- the rotor steel material divided by the intermediate plate 300 in the rotor 3 in the present embodiment has the same cross-sectional shape even if it is cut along any plane perpendicular to the rotor rotation axis. For this reason, the rotor 3 in this embodiment has an advantage in terms of manufacturing. That is, the rotor 3 according to the present embodiment can be cut out from a single metal lump. Moreover, when forming the rotor 3 in this embodiment with a laminated steel plate, it is not necessary to prepare a plurality of types of steel plates having different hole shapes, and only one type of steel plate is prepared. Therefore, the cost of the steel sheet can be suppressed to an extremely low level from the viewpoint of investment cost of the hollow die for forming the steel sheet, from the viewpoint of parts management, and from the viewpoint of strength and magnetic field design.
- the rotor 3 in the present embodiment has fewer magnetic flux leakage paths than a conventional example having a side bridge. For this reason, the magnet magnetic flux easily interlinks with the winding, which contributes to an increase in torque.
- the permanent magnets 34a and 34b are supported by the outer peripheral edge 33 with uniform stress over the entire length in the rotor axial direction. For this reason, it is hard to generate
- the q-axis protrusion 37 can generate a strong reluctance torque and contributes to an increase in the torque generated in the rotor.
- another feature of the present embodiment is the shape of the outer peripheral edge portion 33.
- the shape of the outer peripheral edge portion 33 By providing irregularities on the outer peripheral surface of the rotor, it is possible to convert a harmonic component of torque generated in the rotor into a fundamental wave component, thereby reducing torque pulsation and increasing torque.
- assembly residual stress remains in the ring-shaped region near the outer peripheral surface of the rotor. Therefore, in the conventional rotor, it is difficult to provide unevenness that causes stress concentration on the outermost peripheral surface of the rotor where such residual stress remains.
- the magnet embedding holes 35a and 35b are communicated with the outer periphery of the rotor, no residual stress remains in the outer peripheral edge portion 33 which is the outermost peripheral region of the rotor 3. Therefore, in this embodiment, in order to increase the torque, it is possible to provide unevenness on the outer peripheral surface of the outer peripheral edge portion 33 which is the outermost peripheral area of the rotor 3. Therefore, in the present embodiment, the radius of curvature of the outer peripheral surface of the outer peripheral edge 33 located outside the permanent magnet when viewed from the rotor rotation center is made smaller than the distance from the rotor rotation center to the rotor outermost periphery. For this reason, in this embodiment, the pulsation of the torque generated in the rotor 3 can be reduced and the torque can be increased.
- positioning protrusions 38a and 38b are provided on the outer peripheral edge 33 located radially outward as viewed from the permanent magnets 34a and 34b. Therefore, by pressing the permanent magnets 34a and 34b against the positioning projections 38a and 38b and fixing them, the imbalance between the centrifugal forces generated in the two permanent magnets 34a and 34b forming one pole is prevented and each permanent magnet is generated. Can prevent the magnetic flux distribution from being unbalanced.
- the rotor 3 may be placed directly on the floor with the rotor rotating shaft horizontal. At that time, stress concentrates on the center bridge 32.
- the magnet embedding holes 35a and 35b are communicated with the outer periphery of the rotor, and the outer peripheral edge 33 and the permanent magnets 34a and 34b are supported only by the center bridge 32. concentrate.
- the rotor 3 in this embodiment has a disk-shaped intermediate plate 300 whose outer periphery is generally circular at one or a plurality of positions along the rotor axial direction.
- the outer diameter of the intermediate plate 300 is larger than the outer diameter of the steel material of the rotor 3. For this reason, in a state where the rotor 3 is placed directly on the floor, the rotor steel material is supported by the intermediate plate 300, and the stress applied to the center bridge 32 can be relaxed. Further, the intermediate plate 300 does not have holes other than holes for allowing the shaft 4 to pass therethrough. Further, the intermediate plate 300 is made of a metal material mainly composed of iron, such as steel or stainless steel. And this material is rich in elasticity, toughness, and strong. For this reason, the intermediate plate 300 is extremely resistant to stress, and has an effect of preventing the intermediate plate 300 itself from being damaged and protecting the rotor steel material.
- the intermediate plate 300 having a nonmagnetic film formed on the surface since the intermediate plate 300 having a nonmagnetic film formed on the surface is used, the flow of magnetic flux in the rotor rotation axis direction can be prevented and magnetic flux leakage can be suppressed. Therefore, the torque generated in the rotor 3 can be increased without making the permanent magnet strong. Alternatively, since the same torque can be generated even if the amount of magnets is reduced, the speed of the motor can be increased.
- the nonmagnetic film formed on the intermediate plate 300 is nonconductive. According to this aspect, generation of eddy current can be prevented and overheating can be prevented.
- FIG. 4 is a perspective view showing the configuration of the rotor 3A in the second embodiment of the present invention.
- FIG. 5 is a front view of the rotor 3A viewed from the direction of the rotation center axis 4a.
- 4 and 5 show the configuration of the rotor 3A in a state in which a part thereof is cut off by two planes orthogonal to the rotation center axis 4a in order to facilitate understanding of the configuration of the rotor 3A. 4 and 5, the same reference numerals are given to the same parts shown in FIGS. 2 and 3, and the description thereof is omitted.
- the intermediate plate 300A has a shape or a size that is different from the magnet embedded holes 35a and 35b in that at least a partial region in the hole is opposed to the region in the magnet embedded holes 35a and 35b of the rotor steel material.
- the intermediate plate 300A in the present embodiment has the holes 301a and 301b, the intermediate plate 300A is inferior to the intermediate plate 300 of the first embodiment in terms of strength.
- the intermediate plate 300A can obtain sufficient strength to support the rotor.
- the intermediate plate 300A serves as a detent for the permanent magnets 34a and 34b in the rotor rotation axis direction. Therefore, depending on the structure of the rotor 3A, the assembly of the rotor 3A may be simplified.
- the rotor 3A according to the present embodiment also has an advantage in terms of cooling.
- the rotor 3A since the magnet embedding holes 35a and 35b in the rotor steel plates on both sides of the intermediate plate 300A communicate with each other through the holes 301a and 301b of the intermediate plate 300A, the rotor 3A is well ventilated in the rotation axis direction, cooled, It is particularly advantageous for magnet cooling. Therefore, by adopting the rotor 3A according to the present embodiment, it is possible to relax the regulations regarding the motor capacity.
- FIG. 6 is a front view of the rotor 3B according to the third embodiment of the present invention viewed from the direction of the rotation center axis 4a.
- FIG. 6 in order to facilitate understanding of the configuration of the rotor 3B, the configuration of the rotor 3B in a state in which a part is cut off by two planes orthogonal to the rotation center axis 4a is shown.
- the same parts as those shown in FIG. 3 are denoted by the same reference numerals, and the description thereof is omitted.
- the rotor 3B in the present embodiment has an intermediate plate 300B having a hole, as in the second embodiment.
- the holes 302a and 302b provided in the intermediate plate 300B have shapes and sizes that allow the permanent magnets 34a and 34b embedded in the magnet embedded holes 35a and 35b to be inserted.
- the intermediate plate 300B does not hinder the movement of the permanent magnets 34a and 34b in the rotor rotation axis direction. Therefore, depending on the structure of the rotor 3B, the assembly process of the rotor 3B can be simplified.
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- Iron Core Of Rotating Electric Machines (AREA)
Abstract
Description
図1はこの発明の第1実施形態である永久磁石埋め込み式回転電機の全体構成を示す縦断面図である。図1において、フレーム1は、永久磁石埋め込み式回転電機全体を覆う筐体であり、鉄、アルミ、ステンレスなどにより構成されている。フレーム1の内側には、中空円筒状の固定側鉄心2が設けられている。この固定側鉄心2は、けい素鋼板を積層してなるものである。この固定側鉄心2には、穴が設けられており、この穴には銅線などによるステータ巻線が挿通されている(図示略)。固定側鉄心2の内側には、固定側鉄心2との間に所定のギャップを挟んだ状態で、回転側鉄心であるロータ3が挿通されている。このロータ3は、けい素鋼板を積層してなるものである。なお、単純な鉄ブロックを切削加工することによりロータ3が構成される場合もある。ロータ3は、その中心を鉄などによるシャフト4が貫通している。理想的には、シャフト4の中心軸がロータ3の回転中心軸4aとなる。そして、シャフト4は、ベアリング鋼などからなる転がり軸受け5を介して、フレーム1の前後両端に設けられたシールド6に支持されている。
以上が本実施形態におけるロータ3の構成である。
図4はこの発明の第2実施形態におけるロータ3Aの構成を示す斜視図である。また、図5は回転中心軸4a方向からロータ3Aを見た正面図である。なお、図4および図5では、ロータ3Aの構成の理解を容易にするため、回転中心軸4aにおいて直交した2つの平面により一部を切除した状態のロータ3Aの構成を示している。また、図4および図5では、前掲図2および図3に示された部分の同一の部分には共通の符号を付けて、その説明を省略する。
図6はこの発明の第3実施形態におけるロータ3Bを回転中心軸4a方向から見た正面図である。なお、図6では、ロータ3Bの構成の理解を容易にするため、回転中心軸4aにおいて直交した2つの平面により一部を切除した状態のロータ3Bの構成を示している。また、図6では、前掲図3に示された部分の同一の部分には共通の符号を付けて、その説明を省略する。
Claims (13)
- 2個の永久磁石で1極を構成し、複数極の永久磁石をロータ内部に埋め込んだ永久磁石埋め込み式電動機において、
ロータ鋼材のロータ軸方向中間に、外周が概ね円形のディスク状の中間板を1枚または複数枚配置したことを特徴とする永久磁石埋め込み式回転電機。 - ロータ鋼材内において前記永久磁石を収容する磁石埋め込み穴がロータ外周と連通していることを特徴とする請求項1に記載の永久磁石埋め込み式回転電機。
- 前記中間板の外径が前記ロータ鋼材の外径よりも大きいことを特徴とする請求項2に記載の永久磁石埋め込み式回転電機。
- 前記中間板が金属材料により構成されていることを特徴とする請求項3に記載の永久磁石埋め込み式回転電機。
- 前記中間板を構成する金属材料が鉄を主成分とすることを特徴とする請求項4に記載の永久磁石埋め込み式回転電機。
- 前記中間板の表面に非磁性膜を形成してなることを特徴とする請求項5に記載の永久磁石埋め込み式回転電機。
- 前記非磁性膜が非電導性であることを特徴とする請求項6に記載の永久磁石埋め込み式回転電機。
- 前記中間板のロータ軸方向隣に非磁性の薄板を配置したことを特徴とする請求項5に記載の永久磁石埋め込み式回転電機。
- 前記非磁性の薄板が非電導性であることを特徴とする請求項8に記載の永久磁石埋め込み式回転電機。
- 前記中間板は、穴内の少なくとも一部の領域が前記ロータ鋼材の磁石埋め込み穴内の領域と対向し、かつ、前記磁石埋め込み穴と異なる形状または大きさの穴を有することを特徴とする請求項1~9のいずれか1の請求項に記載の永久磁石埋め込み式回転電機。
- 前記中間板に設けられた穴が、前記磁石埋め込み穴に埋め込まれる永久磁石を挿通可能な形状および大きさを有する穴であることを特徴とする請求項10に記載の永久磁石埋め込み式回転電機。
- 前記中間板に設けられた穴は、前記磁石埋め込み穴に埋め込まれる永久磁石の一部を包含し、前記永久磁石の残りの部分が穴から食み出る形状および大きさを有する穴であることを特徴とする請求項10に記載の永久磁石埋め込み式回転電機。
- 前記中間板は、ロータのシャフトを貫通させるための穴以外の穴を有しないことを特徴とする請求項1~9のいずれか1の請求項に記載の永久磁石埋め込み式回転電機。
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CN201480013849.0A CN105191069B (zh) | 2013-04-01 | 2014-03-03 | 永磁体嵌入式旋转电机 |
JP2015509956A JP6083467B2 (ja) | 2013-04-01 | 2014-03-03 | 永久磁石埋め込み式回転電機 |
EP14778873.1A EP2983273B1 (en) | 2013-04-01 | 2014-03-03 | Rotating electrical machine with embedded permanent magnet |
US14/850,183 US10158265B2 (en) | 2013-04-01 | 2015-09-10 | Embedded permanent magnet type rotating electric machine |
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US14/850,183 Continuation US10158265B2 (en) | 2013-04-01 | 2015-09-10 | Embedded permanent magnet type rotating electric machine |
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US (1) | US10158265B2 (ja) |
EP (1) | EP2983273B1 (ja) |
JP (1) | JP6083467B2 (ja) |
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Cited By (2)
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JP2018082562A (ja) * | 2016-11-16 | 2018-05-24 | 株式会社前川製作所 | 磁石埋め込み型モータ用ロータ及び磁石埋め込み型モータ |
JP7317267B1 (ja) * | 2022-04-14 | 2023-07-28 | 三菱電機株式会社 | 回転装置 |
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EP2983273B1 (en) * | 2013-04-01 | 2019-12-18 | Fuji Electric Co., Ltd. | Rotating electrical machine with embedded permanent magnet |
EP2999089B1 (de) * | 2014-09-19 | 2017-03-08 | Siemens Aktiengesellschaft | Reluktanzläufer |
US10541577B2 (en) * | 2016-01-13 | 2020-01-21 | Ford Global Technologies, Llc | Utilization of magnetic fields in electric machines having skewed rotor sections and separators with cutouts |
US20170229933A1 (en) * | 2016-02-10 | 2017-08-10 | Ford Global Technologies, Llc | Utilization of Magnetic Fields in Electric Machines |
FR3063400B1 (fr) * | 2017-02-24 | 2021-11-19 | Leroy Somer Moteurs | Machine electrique tournante a flux axial |
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Also Published As
Publication number | Publication date |
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CN105191069B (zh) | 2017-09-05 |
JPWO2014162804A1 (ja) | 2017-02-16 |
JP6083467B2 (ja) | 2017-02-22 |
CN105191069A (zh) | 2015-12-23 |
EP2983273A1 (en) | 2016-02-10 |
US20150380995A1 (en) | 2015-12-31 |
EP2983273B1 (en) | 2019-12-18 |
EP2983273A4 (en) | 2016-12-28 |
US10158265B2 (en) | 2018-12-18 |
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