WO2013011546A1 - 永久磁石埋込型モータならびにこれを用いた圧縮機、送風機および冷凍空調装置 - Google Patents
永久磁石埋込型モータならびにこれを用いた圧縮機、送風機および冷凍空調装置 Download PDFInfo
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- WO2013011546A1 WO2013011546A1 PCT/JP2011/066244 JP2011066244W WO2013011546A1 WO 2013011546 A1 WO2013011546 A1 WO 2013011546A1 JP 2011066244 W JP2011066244 W JP 2011066244W WO 2013011546 A1 WO2013011546 A1 WO 2013011546A1
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- permanent magnet
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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
-
- 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]
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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
-
- 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
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
Definitions
- the present invention relates to a permanent magnet embedded motor and a compressor, a blower, and a refrigeration air conditioner using the same.
- the magnetic body has six divided outer peripheral surfaces in which the outer peripheral surface of the magnetic body is divided at equal angular intervals in the circumferential direction corresponding to the permanent magnets, and a nonmagnetic portion located between each of the six divided outer peripheral surfaces.
- the nonmagnetic portion is configured as a recess in which air is interposed between each of the six divided outer peripheral surfaces and the stator, and the divided outer peripheral surface is a first arcuate surface formed at a central portion in the circumferential direction.
- a permanent magnet embedded motor including two second arc surfaces that are continuously connected to both ends of the first arc surface and have a smaller radius of curvature than the radius of curvature of the first arc surface.
- the rotor core of the permanent magnet embedded motor is configured such that the nonmagnetic part is formed as a recess between each of the six divided outer peripheral surfaces and air is interposed between the stator and the stator. Since the width in the direction perpendicular to the radial direction of the permanent magnet embedded in the rotor core in the circumferential direction is determined depending on the depth of the recess, the width in the direction perpendicular to the radial direction of the permanent magnet is increased. There was a problem that restrictions were added and it was difficult to further strengthen the magnetic force.
- the present invention has been made in view of the above, and an object of the present invention is to provide a permanent magnet embedded motor capable of further strengthening magnetic force.
- the permanent magnet embedded motor according to the present invention is configured so that a plurality of teeth portions around which stator windings are wound are circumferentially spaced at equal angular intervals through the slot portions.
- the radial distance is the maximum, the first curved surface formed from the circumferential center to both ends in the circumferential direction, and the radial distance from the axis of the rotor at the circumferential ends of the divided outer circumferential surface is the minimum.
- Formed from the circumferential ends to the circumferential center A second curved surface that intersects the first curved surface, and the second curved surface is rotated in the partial section or the entire section that extends from the circumferential ends of the divided outer circumferential surface toward the circumferential center.
- the first curved surface is formed by a circular arc surface having the child's axial center as a central axis, and the distance between both ends is smaller than the width of the permanent magnet in the direction perpendicular to the radial direction at the circumferential center of the divided outer circumferential surface. It is characterized by that.
- FIG. 1 is a cross-sectional view of a permanent magnet embedded motor according to an embodiment.
- FIG. 2 is an enlarged view of the magnetic pole part of the rotor of the permanent magnet embedded motor shown in FIG.
- FIG. 3 is an enlarged view of a magnetic pole portion of a rotor of a conventional permanent magnet embedded motor.
- FIG. 4 is a diagram for explaining the condition of the angle between both ends of the circular arc surface constituting the third curved surface.
- FIG. 1 is a cross-sectional view of a permanent magnet embedded motor according to an embodiment.
- the embedded permanent magnet motor according to the embodiment includes a stator 1, a rotor 2, a plurality of permanent magnets 3, and a rotating shaft 4.
- the stator 1 is arranged so as to surround the rotor 2 with the rotation shaft 4 as a central axis, and a plurality of teeth portions 5 around which stator windings are wound are arranged at substantially equal angles via the slot portions 6. Arranged circumferentially at intervals.
- the stator 1 has a concentrated winding structure in which the stator winding is wound around each tooth portion 5 and a distributed winding structure in which the stator winding is wound around the plurality of tooth portions 5. Although it may have, it is applicable to both.
- the teeth part 5 and the slot part 6 have shown the example each comprised 9 pieces.
- the number of the teeth portions 5 and the slot portions 6 is not limited to this, and may be less than 9 or 9 or more.
- the rotor 2 is a thin electromagnetic steel sheet (for example, a thickness of about 0.1 to 1.0 mm and a non-oriented electrical steel sheet (a crystal axis of each crystal so as not to be biased toward a specific direction of the steel sheet and exhibit magnetic properties). The direction is randomly arranged as much as possible))) is punched into a predetermined shape with a mold, and a predetermined number (a plurality) is laminated.
- a thin electromagnetic steel sheet for example, a thickness of about 0.1 to 1.0 mm and a non-oriented electrical steel sheet (a crystal axis of each crystal so as not to be biased toward a specific direction of the steel sheet and exhibit magnetic properties). The direction is randomly arranged as much as possible)) is punched into a predetermined shape with a mold, and a predetermined number (a plurality) is laminated.
- a plurality of permanent magnet insertion holes 7 having a rectangular cross section are formed at substantially equal intervals in the circumferential direction.
- a gap 9 is formed at both ends of the permanent magnet insertion hole 7 to separate the permanent magnet 3 and the thin portion of the outer peripheral surface of the rotor 2.
- a shaft hole 8 into which the rotating shaft 4 is fitted is formed at a substantially central portion of the rotor 2.
- the permanent magnet 3 for example, a rare earth mainly composed of neodymium, iron, or boron is formed in a flat plate shape, and both surfaces thereof are magnetized to an N pole and an S pole, respectively.
- each permanent magnet insertion hole 7 of the rotor 2 the permanent magnet 3 is embedded so that the N pole face and the S pole face are alternately formed, thereby forming the rotor 2.
- the number of magnetic poles of the rotor 2 may be any number as long as it is two or more, but FIG. 1 illustrates the case where the number of magnetic poles of the rotor 2 is six.
- the outer peripheral surface of the rotor 2 is constituted by a plurality of divided outer peripheral surfaces 10 that are divided at substantially equal angular intervals in the circumferential direction corresponding to a plurality of permanent magnets 3 (here, six).
- Each part of the rotor 2 divided for each divided outer peripheral surface 10 is hereinafter referred to as a “magnetic pole part”.
- FIG. 2 is an enlarged view of the magnetic pole part of the rotor of the permanent magnet embedded motor shown in FIG.
- the divided outer peripheral surface 10 constituting the magnetic pole portion is configured by combining a plurality of curved surfaces. More specifically, the divided outer circumferential surface 10 has a maximum radial distance (r1) from the axis of the rotor 2 at the circumferential center of the divided outer circumferential surface 10, and is formed from the circumferential center to both ends in the circumferential direction. The radial distance (r2) from the axial center of the rotor 2 is minimized at both ends in the circumferential direction of the first curved surface 11 and the divided outer peripheral surface 10, and is formed from the circumferential ends to the circumferential center. And the second curved surface 12 that intersects the curved surface.
- the first curved surface 11 includes a third curved surface 13 in a predetermined section formed from the circumferential center of the divided outer circumferential surface 10 to both ends in the circumferential direction, and a second curved surface 12 from the end of the third curved surface 13. It is comprised from the 4th curved surface 14 of the area until it crosses.
- the second curved surface 12 is formed by a circular arc surface having a radius r2 with the axis of the rotor 2 as the central axis in a partial section or all sections extending from both circumferential ends of the divided outer peripheral surface 10 toward the circumferential center.
- the distance a is larger than the radial distance b between the rotor 2 and the inner peripheral surface 1a of the stator 1 at the circumferential center on the first curved surface 11, and a partial section on the second curved surface 12 or
- the radial distance a between the arc surface forming the entire section and the inner peripheral surface 1a of the stator 1 is formed to be substantially constant.
- FIG. 3 is an enlarged view of a magnetic pole portion of a rotor of a conventional permanent magnet embedded motor.
- the divided outer peripheral surface 10a of the rotor 2a is an axis of the rotor 2a at the center in the circumferential direction of the divided outer peripheral surface 10 on each divided outer peripheral surface 10a. It is formed by a single circular arc surface having a radius r1 ′ smaller than the radial distance r1 from the center.
- the radial distance b ′ between the divided outer peripheral surface 10 a of the rotor 2 a and the inner peripheral surface 1 a of the stator 1 at the center in the circumferential direction of the divided outer peripheral surface 10 is the smallest, and rotation at both ends in the circumferential direction of the divided outer peripheral surface 10 is performed.
- the radial distance a ′ between the divided outer peripheral surface 10a of the child 2a and the inner peripheral surface 1a of the stator 1 is the largest.
- the magnetic flux density at the circumferential center of the divided outer circumferential surface 10 having the smallest radial distance is large, and the magnetic flux increases as the radial distance increases toward both circumferential ends of the divided outer circumferential surface 10 in the circumferential direction. Since the density gradually decreases, the amount of change in the magnetic flux density on the outer periphery of the rotor 2a approaches a sine wave shape, and torque ripple can be reduced.
- the radial distance a ′ between the divided outer peripheral surface 10 of the rotor 2 and the inner peripheral surface 1a of the stator 1 is increased near both ends in the circumferential direction of the divided outer peripheral surface 10.
- a restriction is imposed on increasing the width of the permanent magnet 3 in the direction orthogonal to the radial direction, and it is difficult to further strengthen the magnetic force.
- the radial distance a between the circular arc surface formed in a partial section or the entire section on the second curved surface 12 (all sections in the example shown in FIG. 2) and the inner peripheral surface 1a of the stator 1 is 1 is larger than the radial distance b from the inner circumferential surface 1a of the stator 1 at the circumferential center of the divided outer circumferential surface 10 of one curved surface 11 (see FIG. 2), the magnetic flux density at both circumferential ends of the divided outer circumferential surface 10 is The magnetic flux density in the vicinity of the center in the circumferential direction of the divided outer peripheral surface 10 is extremely small.
- the circumference of the divided outer peripheral surface 10 is increased.
- the radial distance a between the stator 1 and the inner peripheral surface 1a in the vicinity of both ends in the direction is substantially constant, and the distance A between both ends XY of the first curved surface 11 is perpendicular to the radial direction at the center in the peripheral direction of the divided outer peripheral surface 10. It is made shorter than the width L of the permanent magnet 3 in the direction (L> A). Thereby, it is possible to further strengthen the magnetic force of the permanent magnet embedded motor while suppressing the influence on the torque ripple.
- the linear distance between both end portions of the permanent magnet 3 closest to both ends in the circumferential direction of the divided outer peripheral surface 10 may be set to L described above.
- the third curved surface 13 is formed by an arc surface having the axis of the rotor 2 as the center axis, and the radius r3 of the arc surface is the center of the rotor 2 at the circumferential center on the first curved surface 11.
- the radial distance b between the third curved surface 13 and the inner peripheral surface 1a of the stator 1 is kept substantially constant.
- the equivalent gap becomes smaller and the magnetic flux increases, so that the magnetic force of the permanent magnet embedded motor is further strengthened, and high efficiency can be achieved.
- the center of the rotor 2 is the central axis of the third curved surface 13 and the second curved surface 12, so that the stator at the circumferential center and both circumferential ends of the divided outer circumferential surface 10.
- the radial distance between 1 and the rotor 2 is constant. As a result, the radial distance between the stator 1 and the rotor 2 can be easily managed, and productivity can be improved.
- the divided distance is larger than the radial distance b between the stator 1 and the rotor 2 at the circumferential center of the divided outer peripheral surface 10. Since the radial distance a between the stator 1 and the rotor 2 near both ends in the circumferential direction of the outer peripheral surface 10 is larger, the radial distance between the stator 1 and the rotor 2 near both ends in the circumferential direction of the divided outer peripheral surface 10. Managing a is easier to manage than managing the radial distance b between the stator 1 and the rotor 2 near the center in the circumferential direction of the divided outer circumferential surface 10.
- a jig with a certain thickness or more is often inserted and managed. For this reason, if the radial distance between the stator 1 and the rotor 2 in the vicinity of both ends in the circumferential direction of the divided outer circumferential surface 10 having a large radial distance between the stator 1 and the rotor 2 is managed, the divided outer circumferential surface. Since the jig cannot be inserted except near both ends in the circumferential direction of 10, it is only necessary to determine whether or not the jig can be inserted without managing the position where the jig is inserted, so that productivity can be improved.
- the fourth curved surface 14 forming the first curved surface 11 exists to continuously connect the third curved surface 13 and the second curved surface 12. Since the torque ripple increases when the fourth curved surface 14 approaches a straight line, the fourth curved surface 14 is preferably formed by an arc surface. It is more preferable that the third curved surface 13 and the second curved surface 12 are connected as continuously as possible. Therefore, in the present embodiment, the radius of the arc surface forming the fourth curved surface 14 is made smaller than the arc surface forming the second curved surface 12 and the arc surface forming the third curved surface 13. . In this way, the amount of change in magnetic flux density generated from the rotor 2 approaches a sine wave shape, and torque ripple can be reduced.
- FIG. 4 is a diagram for explaining the condition of the angle between both ends of the circular arc surface constituting the third curved surface.
- the width of the arcuate surface constituting the third curved surface 13 on the divided outer circumferential surface 10, that is, the radial distance between the stator 1 and the rotor 2 is kept substantially constant in the vicinity of the center in the circumferential direction of the divided outer circumferential surface 10.
- the predetermined section becomes large, there may be a section where the magnetic flux flowing into the teeth portion 5 formed in the stator 1 does not change even when the rotor 2 rotates. In this case, the induced voltage is less likely to be generated, and the induced voltage includes many harmonics, so that the torque ripple increases.
- the angle ⁇ 1 between both ends of the arc surface constituting the third curved surface 13 is ( ⁇ 1 ⁇ 360) when the number of slots formed in the stator 1 is S, as shown in FIG. (° / S) is satisfied, there is no section in which the radial distance between the rotor 2 and the stator 1 does not change with respect to the teeth portion 5 of the stator 1, and harmonics included in the induced voltage are reduced. Torque ripple can be reduced.
- the magnetic flux flowing into the tooth portion 5 depends on the angle ⁇ 2 between the tips of the teeth portion 5 of the inner peripheral surface 1a of the stator 1. Therefore, it is more desirable to satisfy ( ⁇ 1 ⁇ 2) (see FIG. 4).
- the width of the circular arc surface constituting the second curved surface 12 on the divided outer circumferential surface 10, that is, the radial distance between the stator 1 and the rotor 2 in the vicinity of both ends in the circumferential direction of the divided outer circumferential surface 10 is kept substantially constant.
- the diameters of the stator 1 and the rotor 2 from the position at a predetermined angle from both circumferential ends of the divided outer circumferential surface 10 on the second curved surface 12 toward the circumferential ends of the divided outer circumferential surface 10 in the circumferential direction If the directional distance is gradually increased, the magnetic flux entering the teeth portion 5 formed in the stator 1 can be changed, so that the amount of change in the magnetic flux density on the outer periphery of the rotor 2 becomes more sinusoidal. Torque ripple can be reduced.
- the predetermined angle from both ends in the circumferential direction of the divided outer peripheral surface 10 on the second curved surface 12 is, for example, at least (360 ° / S / 4), where S is the number of slots formed in the stator 1. From the position on the second curved surface 12 where the angle from both ends in the circumferential direction of the divided outer circumferential surface 10 is at least (360 ° / S / 4), the circumferential direction is directed to both circumferential ends of the divided outer circumferential surface 10. Thus, the radial distance between the stator 1 and the rotor 2 may be gradually increased.
- the section from the circumferential direction both ends of the divided outer peripheral surface 10 on the second curved surface 12 to the position having the predetermined angle has a convex shape in the centrifugal direction, so that the magnetic flux density on the outer periphery of the rotor 2 is sinusoidal. Can be approached.
- the amount of change in the magnetic flux density on the outer periphery of the rotor 2 is preferably sinusoidal, and the amount of change in the magnetic flux density near the center in the circumferential direction of the divided outer peripheral surface 10 is small. It is desirable that the amount of change in the magnetic flux density increases toward the both ends in the direction.
- Each curved surface constituting the divided outer peripheral surface 10 of the rotor 2 (that is, the third curved surface 13, the fourth curved surface 14, and the second curved surface 12 forming the first curved surface 11) is concave in the centrifugal direction.
- the amount of change in the magnetic flux density on the outer periphery of the rotor 2 increases at the center in the circumferential direction of the divided outer peripheral surface 10 and decreases at both ends in the circumferential direction of the divided outer peripheral surface 10. .
- the number of slots formed in the stator 1 is S, it is a section on the second curved surface 12 to a position where the angle from both ends in the circumferential direction of the divided outer peripheral surface 10 is at least (360 ° / S / 4). Is a section where the magnetic flux density increases from 0T, so it is important to make the amount of change in the magnetic flux in this section sinusoidal.
- the section up to a position where the angle from both ends in the circumferential direction of the divided outer peripheral surface 10 is at least (360 ° / S / 4) exhibits a convex shape in the centrifugal direction, whereby the rotor 2
- the amount of change in the magnetic flux density on the outer periphery can be made closer to a sine wave.
- each curved surface constituting the divided outer peripheral surface 10 of the rotor 2 has a convex shape in the centrifugal direction, the amount of change in the magnetic flux density on the outer periphery of the rotor 2 can be made closer to a sine wave.
- the gap separating the permanent magnet 3 and the thin portion of the outer periphery of the rotor 2 existing near the end of the permanent magnet 3. 9 is provided.
- the permanent magnet 3 Since the thin part of the outer periphery of the rotor 2 is weaker than the other part of the rotor 2, the permanent magnet 3 becomes thinner in the outer periphery of the rotor 2 when the permanent magnet 3 moves in the permanent magnet insertion hole 7.
- a gap 9 is provided so as not to contact the surface. The gap 9 can prevent the permanent magnet 3 from hitting the thin portion on the outer periphery of the rotor 2 even if the permanent magnet 3 moves in the permanent magnet insertion hole 7.
- the air gap 9 also has a function of reducing leakage magnetic flux.
- the outer peripheral surface of the rotor is configured by a plurality of divided outer peripheral surfaces that are divided at equal angular intervals in the circumferential direction corresponding to the permanent magnets.
- the split outer peripheral surface has a radial distance from the center of the rotor at the circumferential center of the split outer peripheral surface, and a first curved surface formed from the circumferential center to both ends in the circumferential direction; The radial distance from the rotor axis at the circumferential ends of the surface is minimized, and the second curved surface formed from the circumferential ends to the circumferential center and intersecting the first curved surface,
- the curved surface is formed by a circular arc surface having the center axis of the rotor as the central axis in a partial section or all sections extending from both circumferential ends of the divided outer peripheral surface toward the circumferential center, and the distance between both ends of the first curved surface is divided Orthogonal to the radial direction at the
- a predetermined section formed from the circumferential center of the divided outer peripheral surface to both ends in the circumferential direction on the first curved surface, that is, the third curved surface is formed by an arc surface having the axis of the rotor as the central axis. Since the radius of the arc surface is equal to the radial distance from the rotor center at the circumferential center of the divided outer peripheral surface, the equivalent gap is reduced and the magnetic flux is increased. The magnetic force of the built-in motor is further strengthened, and high efficiency can be achieved.
- the radial center distance between the stator and the rotor at the circumferential center of the divided outer circumferential surface and both ends in the circumferential direction is constant. Therefore, the radial distance between the stator and the rotor can be easily managed, and productivity can be improved.
- a predetermined section of the first curved surface that is, a section from the end of the arc surface forming the third curved surface to the second curved surface, that is, the fourth curved surface is formed by the arc surface, and the arc Since the radius of the surface is made smaller than the radius of the arc surface forming the second curved surface, the amount of change in the magnetic flux density generated from the rotor approaches a sine wave, and the torque ripple can be reduced.
- the radial distance between the rotor and the stator is relative to the teeth portion of the stator.
- the angle between both ends of the arc surface constituting the third curved surface is set between the tips of the teeth portions. More preferably, the angle is less than the angle.
- the width of the arcuate surface constituting the second curved surface on the divided outer peripheral surface that is, the interval in which the radial distance between the stator and the rotor is kept substantially constant near both ends in the circumferential direction of the divided outer peripheral surface is large. Then, the influence on the magnetic flux density on the outer periphery of the rotor is increased, and the torque ripple is increased.
- the radial distance between the inner circumferential surface of the stator and the inner circumferential surface of the stator at a predetermined angle from both circumferential ends of the divided outer circumferential surface is a predetermined angle from both circumferential ends of the divided outer circumferential surface.
- the circumferential angle of the divided outer peripheral surface on the second curved surface is at least (360 ° / S / 4) from the circumferential position.
- the radial distance between the stator and the rotor may be gradually increased toward both ends in the direction.
- each curved surface constituting the divided outer peripheral surface of the rotor (that is, the third curved surface, the fourth curved surface, and the second curved surface forming the first curved surface) is concave in the centrifugal direction.
- the amount of change in the magnetic flux density at the outer periphery of the rotor is large at the center in the circumferential direction of the divided outer peripheral surface and is small at both ends in the circumferential direction of the divided outer peripheral surface. That is, it is not preferable because the amount of change in magnetic flux density on the outer periphery of the stator cannot be made close to a sine wave.
- the section when the number of slots formed in the stator is S, the section is located on the second curved surface up to a position where the angle from the circumferential ends of the divided outer peripheral surface is at least (360 ° / S / 4). Since the density increases from 0T, it is important that the amount of change in the magnetic flux in this period is a sine wave. Therefore, on the second curved surface, the section to the position where the angle from both ends in the circumferential direction of the divided outer peripheral surface is at least (360 ° / S / 4) exhibits a convex shape in the centrifugal direction. The amount of change in magnetic flux density can be approximated to a sine wave.
- each phase constituting the divided outer peripheral surface of the rotor has a convex shape in the centrifugal direction, the amount of change in magnetic flux density on the outer periphery of the rotor can be made closer to a sine wave.
- the gap between the permanent magnet and the thin outer peripheral surface of the rotor is formed at both ends of the permanent magnet insertion hole for embedding the permanent magnet, thereby reducing leakage flux and inserting the permanent magnet into the permanent magnet. Even if it moves in the hole, it is possible to prevent the permanent magnet from hitting the thin portion on the outer periphery of the rotor.
- the permanent magnet embedded motor of the present embodiment is suitable for use in a compressor or a blower, and the compressor and the blower can be reduced in size and increased in efficiency.
- the refrigeration air conditioner can be reduced in size and efficiency.
- the configuration shown in the above embodiment is an example of the configuration of the present invention, and can be combined with another known technique, and a part thereof is omitted without departing from the gist of the present invention. Needless to say, it is possible to change the configuration.
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Abstract
Description
図1は、実施の形態にかかる永久磁石埋込型モータの横断面図である。図1に示すように、実施の形態にかかる永久磁石埋込型モータは、固定子1と、回転子2と、複数の永久磁石3と、回転軸4とを備えている。
1a 固定子内周面
2,2a 回転子
3 永久磁石
4 回転軸
5 ティース部
6 スロット部
7 永久磁石挿入穴
8 軸孔
9 空隙
10,10a 分割外周面
11 第1の曲面
12 第2の曲面
13 第3の曲面
14 第4の曲面
Claims (16)
- 固定子巻線が巻回された複数のティース部がスロット部を介して等角度間隔に周方向に配置された固定子と、
周方向に等角度間隔に複数の永久磁石が埋設され、前記固定子の内周面に回転自在に保持された回転子と、
を備え、
前記回転子の外周面は、
前記永久磁石に対応して周方向に等角度間隔に分割された複数の分割外周面からなり、
前記分割外周面は、
前記分割外周面の周方向中心において前記回転子の軸心からの径方向距離が最大となり、当該周方向中心から周方向両端に渡って形成される第1の曲面と、
前記分割外周面の周方向両端において前記回転子の軸心からの径方向距離が最小となり、当該周方向両端から周方向中心に渡って形成され前記第1の曲面に交わる第2の曲面と、
により形成され、
前記第2の曲面は、
前記分割外周面の周方向両端から周方向中心に向けて延びる一部区間あるいは全区間において、前記回転子の軸心を中心軸とする円弧面により形成され、
前記第1の曲面は、
前記分割外周面の周方向中心において径方向に直交する方向の前記永久磁石の幅よりも両端間距離が小さい
ことを特徴とする永久磁石埋込型モータ。 - 前記第1の曲面は、前記分割外周面の周方向中心から周方向両端に渡って形成される所定区間において、前記回転子の軸心を中心軸とし、前記分割外周面の周方向中心における前記回転子の軸心からの径方向距離を半径とする円弧面により形成されることを特徴とする請求項1に記載の永久磁石埋込型モータ。
- 前記第2の曲面は、前記分割外周面の周方向両端から周方向中心に向けて延びる全区間において、前記回転子の軸心を中心軸とする円弧面により形成されることを特徴とする請求項2に記載の永久磁石埋込型モータ。
- 前記第1の曲面は、前記所定区間端から前記第2の曲面に交わるまでの区間において、前記第2の曲面を形成する円弧面よりも半径が小さい円弧面により形成されることを特徴とする請求項2に記載の永久磁石埋込型モータ。
- 前記所定区間の両端間角度は、(360°/スロット数)未満であることを特徴とする請求項4に記載の永久磁石埋込型モータ。
- 前記所定区間の両端間角度は、前記ティース部の先端間角度未満であることを特徴とする請求項5に記載の永久磁石埋込型モータ。
- 前記第2の曲面を形成する円弧面と前記固定子の内周面との径方向距離は、前記分割外周面の周方向両端から所定角度となる位置よりも前記分割外周面の周方向両端の方が大きいことを特徴とする請求項1に記載の永久磁石埋込型モータ。
- 前記所定角度は、少なくとも(360°/スロット数/4)であることを特徴とする請求項7に記載の永久磁石埋込型モータ。
- 前記第2の曲面は、前記分割外周面の周方向両端から所定角度となる位置までの区間において遠心方向に凸形状を呈することを特徴とする請求項1に記載の永久磁石埋込型モータ。
- 前記所定角度は、少なくとも(360°/スロット数/4)であることを特徴とする請求項9に記載の永久磁石埋込型モータ。
- 前記第1の曲面および前記第2の曲面は、遠心方向に凸形状を呈することを特徴とする請求項1に記載の永久磁石埋込型モータ。
- 前記回転子は、前記永久磁石を埋設する永久磁石挿入穴の両端部に、前記永久磁石と前記外周面の薄肉部とを隔てる空隙が形成されたことを特徴とする請求項1に記載の永久磁石埋込型モータ。
- 請求項1~12のいずれか一項に記載の永久磁石埋込型モータを適用したことを特徴とする圧縮機。
- 請求項1~12のいずれか一項に記載の永久磁石埋込型モータを適用したことを特徴とする送風機。
- 請求項13に記載の圧縮機を搭載したことを特徴とする冷凍空調装置。
- 請求項14に記載の送風機を搭載したことを特徴とする冷凍空調装置。
Priority Applications (5)
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US14/232,406 US9369015B2 (en) | 2011-07-15 | 2011-07-15 | Permanent magnet embedded motor and compressor, blower, and refrigerating and air conditioning apparatus using permanent magnet embedded motor |
CN201180072332.5A CN103650293B (zh) | 2011-07-15 | 2011-07-15 | 永久磁铁嵌入式电动机、压缩机、送风机和制冷空调装置 |
PCT/JP2011/066244 WO2013011546A1 (ja) | 2011-07-15 | 2011-07-15 | 永久磁石埋込型モータならびにこれを用いた圧縮機、送風機および冷凍空調装置 |
JP2013524530A JP5805191B2 (ja) | 2011-07-15 | 2011-07-15 | 永久磁石埋込型モータならびにこれを用いた圧縮機、送風機および冷凍空調装置 |
EP11869689.7A EP2733823B1 (en) | 2011-07-15 | 2011-07-15 | Permanent magnet motor and compressor, ventilator, and frozen air condition device using same |
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PCT/JP2011/066244 WO2013011546A1 (ja) | 2011-07-15 | 2011-07-15 | 永久磁石埋込型モータならびにこれを用いた圧縮機、送風機および冷凍空調装置 |
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US (1) | US9369015B2 (ja) |
EP (1) | EP2733823B1 (ja) |
JP (1) | JP5805191B2 (ja) |
CN (1) | CN103650293B (ja) |
WO (1) | WO2013011546A1 (ja) |
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JP6806352B2 (ja) | 2015-10-13 | 2021-01-06 | 株式会社安川電機 | 回転電機、回転子鉄心の製造方法 |
WO2017130309A1 (ja) * | 2016-01-27 | 2017-08-03 | 三菱電機株式会社 | 着磁方法、回転子、電動機およびスクロール圧縮機 |
CN107026524B (zh) * | 2016-02-01 | 2021-06-01 | 德昌电机(深圳)有限公司 | 单相电机及其转子 |
TWI608687B (zh) * | 2017-01-04 | 2017-12-11 | 群光電能科技股份有限公司 | 馬達轉子與其形成方法 |
EP4213347A1 (en) * | 2018-03-12 | 2023-07-19 | Mitsubishi Electric Corporation | Electric motor, compressor, fan, and refrigerating and air conditioning apparatus |
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Also Published As
Publication number | Publication date |
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EP2733823B1 (en) | 2017-11-08 |
US9369015B2 (en) | 2016-06-14 |
CN103650293A (zh) | 2014-03-19 |
CN103650293B (zh) | 2016-05-04 |
US20140232230A1 (en) | 2014-08-21 |
EP2733823A4 (en) | 2015-12-02 |
JP5805191B2 (ja) | 2015-11-04 |
EP2733823A1 (en) | 2014-05-21 |
JPWO2013011546A1 (ja) | 2015-02-23 |
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