WO2023176802A1 - 内包磁石型モータおよびそのロータ - Google Patents
内包磁石型モータおよびそのロータ Download PDFInfo
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- WO2023176802A1 WO2023176802A1 PCT/JP2023/009745 JP2023009745W WO2023176802A1 WO 2023176802 A1 WO2023176802 A1 WO 2023176802A1 JP 2023009745 W JP2023009745 W JP 2023009745W WO 2023176802 A1 WO2023176802 A1 WO 2023176802A1
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- Prior art keywords
- magnetic
- rotor
- magnetic region
- slot
- center
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- 230000002093 peripheral effect Effects 0.000 claims abstract description 13
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 6
- 239000000696 magnetic material Substances 0.000 claims abstract description 6
- 239000010959 steel Substances 0.000 claims abstract description 6
- 230000004907 flux Effects 0.000 abstract description 29
- 238000010586 diagram Methods 0.000 description 13
- 238000012986 modification Methods 0.000 description 6
- 230000004048 modification Effects 0.000 description 6
- 239000002245 particle Substances 0.000 description 5
- 230000001360 synchronised effect Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910052761 rare earth metal Inorganic materials 0.000 description 3
- 150000002910 rare earth metals Chemical class 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 229910000565 Non-oriented electrical steel Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000006249 magnetic particle Substances 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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Classifications
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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]
Definitions
- the present invention relates to a rotor for an internal magnet type motor, etc.
- motors including generators.
- inverter control and the spread of high-performance rare earth magnets, power-saving and highly efficient synchronous machines have come into widespread use.
- a synchronous motor is equipped with a permanent magnet (field source) in the rotor, an armature winding (coil) in the stator, and supplies alternating current (AC) to the armature winding.
- This is an AC motor that generates a rotating magnetic field in the stator to drive the rotor.
- a synchronous machine has a surface permanent magnet synchronous motor (referred to as an "SPM motor”) in which a permanent magnet is placed on the surface of the rotor, and a surface permanent magnet placed inside the rotor.
- SPM motor surface permanent magnet synchronous motor
- IPM motor interior permanent magnet synchronous motor
- IPM motors have become mainstream, as they not only provide high torque and power savings, but also improve reliability by preventing permanent magnets from scattering. Descriptions related to such an IPM motor can be found, for example, in the following patent documents.
- Patent Documents 1 to 3 all propose providing a non-magnetic portion (area) at the outer peripheral end (bridge) of a magnet hole (slot) of a rotor core. This prevents the magnetic flux supplied from the permanent magnet from short-circuiting at the bridge, improving the performance of the motor.
- the present invention was made in view of the above circumstances, and an object thereof is to provide a new rotor etc. that can improve the performance of an internal magnet type motor.
- the present invention is a rotor for an internal magnet type motor in which a permanent magnet is contained in a slot of a rotor core made of a magnetic material, and the rotor core has a non-contact structure on the outside of a frame end in at least one of the one or more slots.
- the rotor is a rotor for an internal magnet type motor that has a magnetic region, and the non-magnetic region is unevenly distributed on the side far from the center of the magnetic pole with respect to the center of the frame end of the slot.
- the internal magnet type motor rotor (simply referred to as "rotor") of the present invention first has a non-magnetic region outside the frame end of the slot. This prevents a part of the magnetic flux supplied from the permanent magnet from being short-circuited through a portion/region outside the frame end (referred to as a "frame end” as appropriate). Next, the non-magnetic region is provided biased to the side far from the center of the magnetic pole (also referred to as "outside” as appropriate) with the center of the frame end of the slot as a reference.
- the magnetic flux of the permanent magnet is guided to the stator through the magnetic area (other than the ⁇ non-magnetic area'') on the side closer to the center of the magnetic pole (also referred to as the ⁇ inner area''). be done. In this way, the flux linkage between the rotor and the stator is increased, and the performance of the IPM motor is thereby improved.
- the invention can also be understood as an IPM motor.
- the present invention may be an internal magnet type motor that includes the above-described rotor and a stator that constitutes an armature.
- the non-magnetic region provided on the outer peripheral end side (near the bridge) of the slot (rotor core) is, for example, the circumferential length (minimum length in the circumferential direction) is the width of the gap formed between the rotor and the stator (usually air gap) is better.
- the radial length (minimum radial length) of the non-magnetic region is also preferably larger than the gap width. This makes it easier for the magnetic flux supplied from the permanent magnet to be guided toward the stator at the outer peripheral end of the slot (rotor core).
- non-magnetic region and “magnetic region (region other than the non-magnetic region)" as used herein are determined by the ease with which magnetic flux passes through them.
- the non-magnetic region may have lower (initial) magnetic permeability, lower saturation magnetic flux density, or higher magnetic resistance than the magnetic region.
- the magnetic permeability is adjusted, for example, by changing the material (composition, structure, etc.).
- the saturation magnetization can be adjusted, for example, by changing the material as well as changing the shape (narrowing the width, creating a gap, etc.).
- the "magnetic pole center” as used in this specification is a virtual point for each magnetic pole of the rotor, to which the magnetic flux supplied from the permanent magnets is directed.
- the center of the magnetic poles is located near the outer peripheral edge line of the rotor on the center line (line of symmetry) of each magnetic pole (for example, point Pc or point Pp shown in FIG. 1).
- the radial position of the magnetic pole center differs depending on the specifications of the rotor (electric motor), in this specification, for convenience of explanation, the intersection point between the center line (line of symmetry) of the magnetic pole and the outer peripheral edge line of the rotor (for example, in FIG.
- the point Pc shown in is defined as the "magnetic pole center”.
- the "center of the frame edge” is basically the intersection of the frame line that partitions the slot and the center line of the slot (for example, the point Ps shown in FIG. 1). However, if necessary for the division of the non-magnetic region, a line connecting the intersection and the point where the center line of the slot intersects the outer peripheral edge line of the rotor or the frame line of another slot (for example, point Pe shown in FIG. 1) The minute may be set to the "center of the edge of the frame.”
- the center line of the slot is the locus of the midpoint between the intersections of the straight line drawn from the center of the magnetic pole and the frame line of the slot.
- a locus (Tm) connecting the midpoints (Pm) of both intersections (Pi, Po) of the straight line extending from the magnetic pole center (Pc) and the frame line of the slot is the center line of the slot.
- the slot is usually provided in an arc shape so as to surround the center of the magnetic pole.
- a slot is divided by a rib etc. and multiple small slots are arranged in an arc shape, the inner and outer frame lines (frame lines near and far from the magnetic pole center) of each small slot are extended (extrapolated). ) and consider a hypothetical large slot (slots connected without ribs, etc.). The intersection (or line segment) between the center line of the large slot and the frame edge of the small slot is defined as the center of the frame edge.
- the "circumferential direction” is a direction around the rotation center (axis) of the rotor
- the "radial direction” is a direction extending radially from the rotation center of the rotor.
- the direction of distance from the center of the magnetic pole may be any of the circumferential direction, the radial direction, a composite direction thereof, etc.
- the "rotor” may be an inner rotor or an outer rotor.
- the number of magnetic poles (number of slots provided in the rotor or stator, etc.) of the IPM motor may be two or more.
- x to y as used herein includes a lower limit x and an upper limit y.
- a new range such as “a to b" can be established by setting any numerical value included in the various numerical values or numerical ranges described herein as a new lower limit or upper limit.
- FIG. 3 is a partial cross-sectional view illustrating one magnetic pole of a rotor and a stator. They are a schematic diagram and a contour diagram showing magnetic flux lines (first example) around the bridge of the rotor. They are a schematic diagram and a contour diagram showing magnetic flux lines (second example) around the bridge. They are a schematic diagram and a contour diagram showing magnetic flux lines (third example) around the bridge. It is a schematic diagram which shows the magnetic flux line (4th example) around the bridge. It is a schematic diagram which shows the magnetic flux line (1st modification) around the bridge. It is a schematic diagram which shows the magnetic flux line (2nd modification) around the bridge.
- FIG. 3 is a schematic diagram showing magnetic flux lines around a bridge whose form has been changed. FIG. 3 is a contour diagram showing magnetic flux lines when non-magnetic regions are provided in bridges and ribs.
- a component related to a method can also be a component related to an object (such as a rotor). Which embodiment is best depends on the object, required performance, etc.
- the rotor core is made of a magnetic material, and includes at least one slot for each magnetic pole to enclose (embed) a permanent magnet.
- a non-magnetic region is formed outside the frame end of the at least one slot. Further, the non-magnetic region may be provided only on one or both of the outer edges of the frame.
- slot The shape, arrangement, number of layers, etc. of the slot vary depending on the specifications of the rotor (IPM motor).
- the slots of each magnetic pole are typically provided symmetrically with respect to the magnetic pole center so as to surround the magnetic pole center.
- the part/area outside the frame end of the slot is a bridge on the outer peripheral end of the rotor core, a rib that reinforces the roughly arc-shaped large slot and divides the large slot into small slots. etc.
- the form of the bridge may vary depending on the form of the slot, the non-magnetic region, etc.
- the bridge may have an arc shape with a substantially constant width in the radial direction, or a chevron shape with a varying width in the radial direction. If a bridge or a rib is to be defined, the area outside the frame end of the slot may be cut out by an extension line obtained by extrapolating the inner frame line and the outer frame line of the slot.
- Non-magnetic area and magnetic area Since the non-magnetic area is provided biased to the outside of the frame edge (the side far from the magnetic pole center), if you look at it the other way, it is located inside the frame edge (closer to the magnetic pole center).
- the magnetic region is formed unevenly. As long as such a magnetic region is formed on the center side of the magnetic pole, the range and form of the non-magnetic region are not limited.
- the non-magnetic region may be provided outside the range of the bridges and ribs described above.
- excessive crossing to the outside of the non-magnetic region causes a decrease in the reluctance torque of the IPM motor.
- the outer edge of the non-magnetic region is preferably along (substantially coincident with) the outer edge of the frame end.
- the non-magnetic region is formed by changing the material (composition, structure, etc.) of the magnetic material (magnetic steel sheet, etc.) that makes up the magnetic region (referred to as "non-magnetic modification” or simply “modification”). It may be of a different type, or it may be of a different form with respect to the magnetic region. As an example of the latter, at least a portion of the non-magnetic region may have a narrower width in the radial direction than the magnetic region. This makes it easier for the magnetic flux passing through the non-magnetic region to become saturated. Of course, both the material and the form of the magnetic region may be changed. Note that narrowing the non-magnetic region may also mean reducing the modified region.
- the nonmagnetic modification is performed, for example, by the method described in Patent Document 3 (WO2022/004672) mentioned above.
- a high-energy beam laser or the like
- a minute area can be modified with high precision.
- the narrower the non-magnetic region the more efficient the reforming and the suppression of distortion.
- the permanent magnet contained in the slot may be a sintered magnet obtained by sintering a molded body of magnet particles, or a bonded magnet in which magnet particles are bound (fixed) with a binder resin. Bonded magnets have a large degree of freedom in shape and are suitable for slots with complex shapes. Note that the type, form (particle size, etc.), degree of anisotropy, etc. of the magnetic particles do not matter.
- the permanent magnet is preferably magnetized in the slot toward the vicinity of the magnetic pole center (oriented diagonally from the radial direction). This can increase the magnetic flux passing through the inside of the frame end (magnetic region).
- a permanent magnet is realized by forming and magnetizing in a magnetic field within a slot.
- anisotropic (rare earth) magnet particles may simply be formed in slots of the rotor core in an orienting magnetic field. At this time, it is preferable that the non-magnetic region be formed in advance before forming the bonded magnet.
- FIG. 1 shows a plan view of a base model M (simply referred to as "model M") used in the simulation.
- Model M is one magnetic pole (1/8 model) of an IPM motor consisting of eight magnetic poles.
- Model M includes a rotor core 1, a stator core 2, and a permanent magnet 3.
- the rotor core 1 and the stator core 2 are made of a laminate of electromagnetic steel sheets punched into a desired shape.
- the model M is axisymmetric with respect to the center of the magnetic pole (center line), and in the circumferential direction, the side closer to the magnetic pole center Pc is the inner side, and the side farther from the magnetic pole center Pc is the outer side. Further, the side farther from the rotation center of the rotor core 1 is called the expanded diameter side, and the side closer to the rotation center of the rotor core 1 is called the reduced diameter side.
- the rotor core 1 has two layers of approximately U-shaped slots 12 and 16 symmetrically provided at the center of the magnetic pole.
- the slot 12 on the outside of the rotor core 1 is divided into four parts by three ribs 13 (reinforcement parts) on the rotation center side.
- a slot 16 inside the rotor core 1 is divided into two by one rib 17.
- the frame sides at the outermost peripheral ends of the slots 12 and 16 become bridges 11 and 15 (frame ends).
- the range of the bridge 11 is, for example, an area surrounded by an extension line obtained by extrapolating the inner frame line 12a and outer frame line 12b of the slot 12, the frame edge line 12c of the slot 12, and the outermost circumferential line 1a of the rotor core 1. (hatched part). This also applies to the range of the bridge 15. Note that the bridges 11 and 15 (frame ends) and the ribs 13 (reinforced portions) correspond to the outside of the frame ends of the slots 12 and 16.
- Both slots 12 and 16 are filled with bonded magnets 3.
- the portion other than the slots 12 and 16 is basically a magnetic region made of electromagnetic steel plate.
- the stator core 2 has five teeth 21 and six slots 22 on both sides of each tooth 21 in the circumferential direction.
- An armature winding (coil) is disposed in the slot 22 .
- the portion other than the slot 22 is basically a magnetic region made of electromagnetic steel plate.
- the permanent magnets 3 are, for example, bonded magnets that are formed within the slots 12 and 16 while an orienting magnetic field is applied from the outer circumferential side of the rotor core 1.
- a bonded magnet is, for example, anisotropic rare earth magnet particles bound together with a binder resin.
- the molding method may be injection molding or compression molding.
- the bonded magnets formed in the slots 12 and 16 in an oriented magnetic field are magnetized approximately in the direction of the magnetic pole center, as shown in FIG. 2A, etc., which will be described later, and generate magnetic flux in that direction (that is, they are oriented).
- the bonded magnet may be magnetized from the outer peripheral side of the rotor core 1 after its molding (after solidification of the binder resin).
- the bridge 11 includes a non-magnetic region 110, a magnetic region 111 located inside the non-magnetic region 110, and a magnetic region 112 located outside the non-magnetic region 110.
- the non-magnetic region 110 is arranged outside the frame end center Ps. As a result, the magnetic region 111 is longer than the magnetic region 112 in the circumferential direction.
- the non-magnetic region 110 is formed, for example, by non-magnetic modification (such as making it stainless steel) by laser irradiation or the like.
- the center of the non-magnetic region 110 is made to substantially coincide with the frame end center Ps.
- the circumferential lengths of the magnetic region 111 and the magnetic region 112 are made substantially the same. Other than that, it was the same as model M1.
- a non-magnetic region 110 and a magnetic region 112 outside the non-magnetic region 110 are set in the bridge 11. That is, the non-magnetic region 110 was arranged inside the frame end center Ps, and the magnetic region 111 was not provided inside it. Other than that, it was the same as model M1.
- model M4 as shown in FIG. 2D, the non-magnetic region 110 is not provided, and the entire bridge 11 is made into a magnetic region.
- the analysis conditions were set as follows.
- the rotor core 1 and the stator core 2 are made of a laminate of non-oriented electrical steel sheets (50HXT780T).
- the rotor core 1 had an outer diameter of ⁇ 80 mm and a center hole diameter of ⁇ 45 mm.
- the circumferential length of the bridge 11 was 3 mm
- the circumferential length of the non-magnetic region 110 was 1 mm
- the width (radial length) of the non-magnetic region 110 was 0.5 mm (same as the width of the bridge 11).
- the gap (air gap) between the rotor core 1 and the stator core 2 was set to 0.5 mm.
- the circumferential length will be referred to as "length” and the radial length will be referred to as "width" as appropriate.
- model M1 the length of the magnetic region 111 was 1.5 mm, and the length of the magnetic region 112 was 0.5 mm.
- model M2 the length of the magnetic region 111 was 0.75 mm, and the length of the magnetic region 112 was 0.75 mm.
- model M3 the length of the magnetic region 112 was set to 1.5 mm.
- the magnetic flux supplied from the permanent magnets on the rotor side can be reduced. It was found that it was possible to more effectively guide the wire to the stator side without causing a short circuit within the bridge. In other words, it is preferable that the length of the inner magnetic region is 3/2 or more, 2 or more times, or even 3 times or more the length of the outer magnetic region.
- the bridge 11 may include only the non-magnetic region 110 and the inner magnetic region 111 (or the outer magnetic region 112 may be omitted). Furthermore, as shown in FIG. 3B, the non-magnetic region 110 may extend outward beyond the bridge 11.
- the non-magnetic region 110 may be a modified portion of magnetic material, or may be a narrow portion 113 that is narrower in the radial direction than the magnetic regions 111 and 112, as shown in FIG. 3C.
- the narrow portion 113 may be further modified to be non-magnetic.
- the non-magnetic region (modified region, etc.) may be provided not only in the bridge but also in the ribs between the slots.
- the above simulation was performed using a model in which non-magnetic regions were provided in the bridge 11 and the ribs 13 and 17.
- the results are summarized in FIG. 4.
- Models M1 to M3 shown in FIG. 4 correspond to models M1 to M3 shown in FIGS. 2A to 2C. That is, in the model M1, the non-magnetic region is located outside the frame end center Ps (on the reduced diameter side). In model M2, the center of the non-magnetic region substantially coincides with the frame end center Ps. In model M3, the non-magnetic region is located inside the frame end center Ps (on the expanded diameter side).
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Abstract
Description
(1)本発明は、磁性材からなるロータコアのスロットに永久磁石が内包された内包磁石型モータ用ロータであって、該ロータコアは、一以上の該スロットの少なくとも一方にある枠端外側に非磁性域を有し、該非磁性域は、該スロットの枠端中央を基準に、磁極中心から遠い側に偏在している内包磁石型モータ用ロータである。
本発明は、IPMモータとしても把握される。例えば、本発明は、上述したロータと、電機子を構成するステータと、を備える内包磁石型モータでもよい。このとき、スロット(ロータコア)の外周端側(ブリッジ付近)に設ける非磁性域は、例えば、周方向長(周方向の最小長)がロータとステータの間に形成される空隙幅(通常、エアギャップ)より大きいとよい。さらに、非磁性域の径方向長(径方向の最小長)も、その空隙幅より大きいとよい。これにより、スロット(ロータコア)の外周端側において、永久磁石から供給される磁束がステータ側へより誘導され易くなる。
(1)本明細書でいう「非磁性域」と「磁性域(非磁性域以外の領域)」は、磁束の通り易さにより定まる。例えば、非磁性域は磁性域よりも、低(初)透磁率、低飽和磁束密度または高磁気抵抗であるとよい。透磁率の調整は、例えば、材質(成分組成、組織等)の変化によりなされる。飽和磁化の調整は、例えば、材質変化の他、形態変化(狭幅化、空隙化等)によりなされ得る。
ロータコアは、磁性材からなり、永久磁石を内包(埋設)するスロットを、磁極毎に少なくとも一つ以上備える。その少なくとも一つのスロットの枠端外側に非磁性域が形成される。さらに非磁性域は、その枠端外側の一方のみに設けられても両方に設けられてもよい。
スロットの形状、配置、層数等は、ロータ(IPMモータ)の仕様により異なる。各磁極のスロットは、通常、磁極中心を囲むように、磁極中心に関して対称的に設けられる。
スロットの枠端外側にある部分・領域(枠端部)は、ロータコアの外周端側にあるブリッジ、略弧状の大スロットを補強して大スロットを小スロットに分割するリブ等である。ブリッジは、通常、磁極毎に少なくとも二つ以上ある。磁極毎に二層構造のスロット(図1参照)を設ける場合なら、ブリッジは磁極毎に四つとなる。ブリッジの形態は、スロットや非磁性域の形態等に応じて変化し得る。例えば、ブリッジは、径方向の幅が略一定な円弧状でもよいし、径方向の幅が変化する山型状等でもよい。なお、敢えてブリッジやリブを区画するなら、スロットの枠端外側の領域が、スロットの内側枠線と外側枠線をそれぞれ外挿した延長線により切り取られる範囲とすればよい。
非磁性域が枠端部の外側(磁極中心から遠い側)に偏って設けられるため、逆にみれば、枠端部の内側(磁極中心に近い側)に磁性域が偏って形成される。このような磁性域が磁極中心側に形成される限り、非磁性域を設ける範囲や形態は問わない。
スロットに内包される永久磁石は、磁石粒子の成形体を焼結した焼結磁石でも、磁石粒子をバインダ樹脂で結着(固定)したボンド磁石でもよい。ボンド磁石は形状自由度が大きく、複雑形状のスロットに適する。なお、磁石粒子は、その種類、形態(粒径等)、異方性の程度等を問わない。
シミュレーションに用いたベースモデルM(単に「モデルM」という。)の平面図を図1に示した。モデルMは、8磁極からなるIPMモータの1磁極分(1/8モデル)である。モデルMは、ロータコア1と、ステータコア2と、永久磁石3を備える。ロータコア1とステータコア2は、所望形状に打ち抜いた電磁鋼板の積層体からなる。図1に示すように、モデルMは磁極中央(中心線)に関して線対称であり、周方向に関して、磁極中心Pcに近い方を内側、磁極中心Pcから遠い方を外側とする。また、ロータコア1の回転中心から遠い方を拡径側、ロータコア1の回転中心に近い方を縮径側という。
(1)モデル
ブリッジ11に設けた非磁性域が、ブリッジ11周辺の磁束に及ぼす影響を、次のようなモデルM1~M4を用いてシミュレーションにより評価した。
解析条件は次のように設定した。ロータコア1およびステータコア2は無方向性電磁鋼板(50HXT780T)の積層体からなる。ロータコア1は、外径:φ80mm、中央穴径:φ45mmとした。ブリッジ11の周方向長:3mm、非磁性域110の周方向長:1mm、非磁性域110の幅(径方向長):0.5mm(ブリッジ11の幅と同じ)とした。ちなみに、ロータコア1とステータコア2の隙間(エアギャップ):0.5mmとした。なお、本実施例では、適宜、周方向長を「長さ」、径方向長を「幅」という。
モデルM1~M3に関する解析結果を、磁束線のコンター図に現して、図2A~図2Cの下方にそれぞれ併せて示した。また、コンター図に基づく磁束線の流れを、その上方にそれぞれ模式的に示した。モデルM4については、磁束線の流れを模式的に図2Dに示した。
図2A~図2Dから明らかなように、ブリッジに設ける非磁性域を外側寄りにする(換言すると、外側より内側へ磁性域を拡張する)ことにより、ロータ側の永久磁石から供給される磁束をブリッジ内で短絡させず、ステータ側へより有効に誘導できることがわかった。敢えていうと、内側の磁性域の長さを外側の磁性域の長さに対して、3/2倍以上、2倍以上さらには3倍以上とするとよい。
(1)図3Aに示すように、ブリッジ11を非磁性域110と内側の磁性域111のみとしても(外側の磁性域112を無くしても)よい。さらに図3Bに示すように、非磁性域110を、ブリッジ11の範囲を越えて外側へ拡張してもよい。
2 ステータコア
3 永久磁石
11 ブリッジ
110 非磁性域
111 磁性域
Claims (6)
- 磁性材からなるロータコアのスロットに永久磁石が内包された内包磁石型モータ用ロータであって、
該ロータコアは、一以上の該スロットの少なくとも一方にある枠端外側に非磁性域を有し、
該非磁性域は、該スロットの枠端中央を基準に、磁極中心から遠い側に偏在している内包磁石型モータ用ロータ。 - 前記非磁性域は、前記スロットの外周端側にあるブリッジおよび/または該スロットの隣接間にあるリブに設けられる請求項1に記載の内包磁石型モータ用ロータ。
- 前記非磁性域は、電磁鋼板の一部が非磁性改質されてなる請求項1または2に記載の内包磁石型モータ用ロータ。
- 前記非磁性域の少なくとも一部は、前記ブリッジの径方向幅または前記リブの隣接間隔が周囲よりも小さい狭幅部からなる請求項2に記載の内包磁石型モータ用ロータ。
- 請求項1~4のいずれかに記載のロータと、
電機子を構成するステータと、
を備える内包磁石型モータ。 - 前記スロットの外周端側に設ける非磁性域は、周方向長が前記ロータと前記ステータの間に形成される空隙幅より大きい請求項5に記載の内包磁石型モータ。
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