JP2006230189A - Dynamo-electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dynamo-electric machine, with which vibration/noise excited by radial electromagnetic force of the dynamo-electric machine can be suppressed. <P>SOLUTION: A rotor 1 is divided into four rotor pieces 3, 4, 5 and 6 with respect to rotor core axial length 2L, and the axial lengths of the rotor pieces 3, 4, 5 and 6 are 0.29L, 0.71L, 0.71L and 0.29L. A secondary conductor 2, forming an effective magnetic pole opening angle of the rotor pieces 3, 4, 5 and 6, forms skews so that electrical angle phase differences become the same between rotor piece axial direction cross-sections. The pieces are arranged and shifted by the same difference as the electrical angle phase difference between the rotor piece axial direction cross-sections so that the skew becomes continuous between the rotor pieces 3 and 4 and between the pieces 5 and 6, and the skew becomes discontinuous between the rotor pieces 4 and 5. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a rotating electric machine that suppresses generation of electromagnetic vibration and noise generated by radial excitation force in an induction motor and a generator.

  A large number of rotating electrical machines are used in home appliances or various OA devices, and in recent years, they have been installed in electric vehicles. While a rotating electric machine mounted on an electric vehicle is required to have a high output, vibration and noise due to electromagnetic excitation force are problematic. On the other hand, there are very high demands for vibration and noise reduction by pursuing comfortable environments in houses and electric vehicles. Furthermore, the reduction of vibration and noise has also been a problem for generators.

  The electromagnetic excitation force in the radial direction of the rotating electrical machine is such that the magnetic path of the field magnetic flux generated from the rotor magnetic pole when the rotor and the stator are moved relative to each other, and the opening of the slot provided in the stator passes through the rotor magnetic pole. It is known that this occurs due to a change in the magnetic flux distribution in the gap, which changes periodically every time the crossing is performed. The rotational order, spatial order, and amplitude of the electromagnetic excitation force in the radial direction depend on the number of effective magnetic pole opening angles of the rotor, the number of slots provided in the rotor, and the number of slots provided in the stator.

  As one of the techniques for reducing vibration and noise, a skew is provided in a rotor or a stator of a rotating electric machine. Examples of means for providing the skew include the following Patent Documents 1 to 6.

  In Patent Document 1, in an induction motor of an inner rotor type, a stator is divided in the axial direction and a plurality of coils are wound in a ring shape, and the center of the ring of each coil and the center of the rotating shaft are aligned. A stator iron core that constitutes a magnetic circuit is provided on each outer peripheral side and both axial ends of each coil, and magnetic pole teeth are arranged around the rotating shaft across the coil on the inner peripheral side of the stator core. The magnetic pole tooth portions of the coils are alternately shifted at a predetermined angle in the circumferential direction of the rotating shaft and overlapped in the axial direction.

  In Patent Document 2, the stator includes a plurality of split stators divided in the axial direction, and one split stator is arranged with a shift angle β in the circumferential direction with respect to the other split stator. .

  In Patent Document 3, in an induction motor in which a secondary conductor is cast into a closed slot formed in a rotor to form a squirrel-cage winding, a slot having a wide closed slot structure is provided at the axial center of the rotor core. And a second and third iron core portions having slots of a narrow closed slot structure on both sides of the first iron core portion, and a wide closed slot structure of the first iron core portion. The secondary conductor is connected to the central portion in the axial direction of the rotor core by communicating the overlapping slot of the slot having the closed slot structure having the narrow slot width with the slot portion of the second and third iron core portions having the narrow closed slot structure. Is short-circuited.

  In Patent Document 4, in a squirrel-cage rotor that forms a laminated iron core by laminating steel plates on which slot forming punch portions for accommodating conductors are formed, the steel plate punch portion is used as a bridge portion on the outer peripheral side or With respect to the center line of the main part where the opening houses the conductor

を満足する距離ｄだけずれた位置となる非対称形状に形成し、積層鉄心は、鋼板をスロットの方向が一致するようにして複数枚積層された複数の単位ブロックを複数組合せ、各単位ブロック間においてはスロットの方向が互いに異なりかつ主部が重なるように構成され、複数組の積層鉄心のうち少なくとも１個は所定量スキューしている。

Is formed in an asymmetrical shape that is shifted by a distance d satisfying the above, and the laminated iron core is a combination of a plurality of unit blocks in which a plurality of steel plates are laminated so that the slot directions coincide with each other. Are configured such that the directions of the slots are different from each other and the main portions overlap each other, and at least one of the plural sets of laminated cores is skewed by a predetermined amount.

  In Patent Document 5, in a rotor provided with a cylindrical permanent magnet divided into a plurality of parts in the axial direction, the skew direction of adjacent cylindrical permanent magnets is reversed and each cylindrical permanent magnet is subjected to one groove pitch skew. , And skewed in a W shape. Alternatively, the rotor is composed of a cylindrical permanent magnet divided into a plurality of parts in the axial direction and skewed by one groove pitch in the same direction, and the skew lines of adjacent cylindrical permanent magnets are skewed by one groove pitch to be skewed in a lightning bolt shape. .

  In Patent Document 6, the rotor is divided into a plurality of rotor pieces in the axial direction for each pole of the effective magnetic pole opening angle, and adjacent pieces are skewed by shifting 1/2 slot.

JP 2003-333811 A JP 7-298578 A JP 7-163108 A No. 2854664 JP-A-8-298735 JP 2004-357405 A

  However, Patent Document 1 can also reduce the influence of the harmonic component of the gap magnetic flux and reduce the vibration and noise by skewing the stator or the rotor. However, the axial mode of the stator is considered. In addition, since the axial length of the back stator core is not optimized, the vibration / noise reduction effect by the radial electromagnetic excitation force is not sufficient.

  Patent Document 2 is also effective in reducing vibration and noise due to torque pulsation, but has little effect on reducing vibration and noise due to radial electromagnetic excitation force.

  Patent Document 3 is also effective in reducing the occurrence of crossflow loss, but has little effect of reducing vibration and noise due to electromagnetic excitation force.

  Also in Patent Document 4, generation of abnormal torque due to harmonic components and vibration / noise caused by the abnormal torque can be suppressed. However, since the axial length and skew angle of each unit block are not optimized at the same time, vibration due to radial electromagnetic excitation force is caused.・ Noise reduction effect is not enough.

  Also in Patent Document 5, the cogging torque can be reduced, but since the length of the permanent magnet is not optimized, the vibration / noise reduction effect by the radial electromagnetic excitation force is not sufficient.

  Also in Patent Document 6, one pole of the effective magnetic pole opening angle is, for example, an effective magnetic pole opening angle in which a plurality of grooves are formed at equal intervals in the circumferential direction on the rotor of the induction motor, and aluminum grooves are formed in the grooves. However, there is a problem that it cannot be applied to a configuration in which it is difficult to provide a skew shifted by 1/2 slot at a plurality of locations.

  An object of the present invention is to provide a rotating electrical machine that reduces vibrations caused by the radial electromagnetic excitation force of the rotating electrical machine, and as a result, lower noise.

  In the rotating electrical machine including a rotor and a stator having a plurality of slots, the object is to divide the rotor into a plurality of rotor pieces in the axial direction, and one of the divided rotor pieces. Pieces are achieved by different combinations of axial length and absolute skew angle of at least one other piece.

  In the rotating electrical machine including a rotor and a stator having a plurality of slots, the above object is obtained by dividing the stator into a plurality of stator pieces in the axial direction, and among the divided stator pieces, One piece is achieved by different combinations of axial length and skew angle absolute value of at least one other piece.

  Further, the above object is achieved by dividing the rotor piece into two regions at the central part of the axial length, where the left side is the A region and the right side is the B region, the signs of the skew angles of the A region and the B region are different. Is done.

  Further, the above object is achieved by the fact that the stator piece is divided into two regions at the central portion of the axial length, and the left side is the A region and the right side is the B region, the signs of the skew angles of the A region and the B region are different. Is done.

  Further, the above object is that the rotor is divided into 3n (n is a multiple of 2), and when the three are set as a set, the left side is the D region, the center is the E region, and the right side is the F region. The absolute value of the angle is smaller than the absolute value of the skew angle of the D region and the F region, and the signs of the skew angles of the D region, the E region, and the F region are the same.

  Also, the purpose of the above is to divide the stator into 3n (n is a multiple of 2), and set the three as a set, the left side is the D region, the center is the E region, and the right side is the F region. The absolute value of the angle is smaller than the absolute value of the skew angle of the D region and the F region, and the signs of the skew angles of the D region, the E region, and the F region are the same.

Further, the object is to divide the rotor into four rotor pieces in the axial direction, and the length and the skew angle of each rotor piece are 0.29L, 0 when the axial length of the rotor core is 2L. With reference to the lengths of 0.71L, 0.71L, and 0.29L, the 0.29L rotor piece is -4% to + 16% of the rotor core axial length 2L, and the 0.71L rotor piece is the rotor. It is set to any length in the range of + 4% to -16% of the axial length 2L of the core,
The effective magnetic pole opening angle of the two rotor pieces constituting the axial length L continuously forms a skew in each rotor piece, and the electrical angle phase difference between both ends of the two rotor pieces is the same. Thus, the skew is continuously arranged between the two rotor pieces, and the two rotor pieces constituting the remaining half of the axial length L have two rotations constituting the axial length L. An electrical angle position between both ends of the rotor piece in the circumferential direction so that the skew is discontinuous at the center of the axial length of the rotor core. This is achieved by shifting the phase difference by the same electrical angle phase difference as the phase difference.

Further, the above object is that the stator is divided into four pieces in the axial direction, and the length and skew angle of each of the stator pieces are 0.29L and 0.71L when the axial length of the stator core is 2L. ,
Based on the 0.71L and 0.29L lengths, the 0.29L stator piece is -4% to + 16% of the stator core shaft length 2L, and the 0.71L stator piece is the stator core axis. The length is set to any length in the range of + 4% to -16% of 2L,
The effective magnetic pole opening angle of the two stator pieces constituting the axial length L continuously forms a skew in each stator piece, and the electrical angle phase difference between both ends of the two stator pieces is the same. Thus, the skew is continuously arranged between the two stator pieces, and the two stator pieces constituting the remaining half axial length L are the two fixed pieces constituting the axial length L. An electrical angle position between both ends of the stator piece in the circumferential direction so that the skew is discontinuous at the center of the axial length of the stator core. This is achieved by shifting the phase difference by the same electrical angle phase difference as the phase difference.

Further, the above object is that the rotor is divided into six pieces in the axial direction, and the length and the skew angle of each rotor piece are 0.25L and 0.5L when the axial length of the rotor core is 2L. ,
Based on the lengths of 0.25L, 0.25L, 0.5L, and 0.25L, it is set to any length within a range of ± 4% of the axial length 2L of the rotor core. The effective magnetic pole opening angles of the three rotor pieces constituting the same continuously form a skew in each rotor piece, and the electrical angle phase difference between both ends of the three rotor pieces is the same, and the three rotations The skew is continuously arranged between the child pieces, and the three rotor pieces constituting the remaining half of the axial length L are divided into three rotor pieces constituting the axial length L. An electrical angle equal to the electrical angle phase difference between both ends of the rotor piece in the circumferential direction is used so that the skew is discontinuous at the center of the axial length of the rotor core. This is achieved by shifting the phase difference.

Further, the above-mentioned object is that the stator is divided into six pieces in the axial direction, and the length and skew angle of each stator piece is 0.25L, 0.5L when the axial length of the stator core is 2L. ,
Based on the lengths of 0.25L, 0.25L, 0.5L, and 0.25L, it is set to any length within the range of ± 4% of the axial length 2L of the stator core. The effective magnetic pole opening angles of the three stator pieces that form are continuously skewed by the respective stator pieces, and the electrical angle phase difference between both ends of the three stator pieces is the same, and the three fixed pieces are fixed. The skew is continuously arranged between the child pieces, and the three stator pieces constituting the remaining half of the axial length L are divided into three stator pieces constituting the axial length L. An electrical angle equal to the electrical angle phase difference between both ends of the stator piece in the circumferential direction is used so that the skew is discontinuous at the center of the axial length of the stator core. This is achieved by shifting the phase difference.

  By the way, each rotor or stator is divided into four or more rotor pieces or stator pieces with respect to the axial length 2L (here, “divided” is made up of a predetermined number of pieces that are considered to be divided). (Including the case where it is set so). The axial length and circumference of the effective magnetic pole opening angle included in each rotor piece or stator piece is such that each rotor piece or stator piece generates a force that is orthogonal to the axial deformation mode of the stator. A relative position in the direction is determined. The effective magnetic pole opening angle is an angle at which there is an actual magnetic flux such as a permanent magnet with respect to the rotation axis.

The rotor or stator is divided into 4 or 4n (n is an integer) or more pieces in the axial direction, and the length and electrical angle of each piece are the axial length 2L of the rotor core or stator core, the shaft Direction x-axis, axis center x = 0 (x is -L or more and L or less), radial excitation force is f (x)
(F (x) is a complex number), the following three relational expressions for the rotational order of interest:
Relational expression 1 for the 0th-order mode in the axial direction of the stator

固定子の軸方向の１次モードに対する関係式２

Relational expression 2 for the first axial mode of the stator

固定子の軸方向の２次モードに対する関係式３

Relational expression 3 for the secondary mode in the axial direction of the stator

に基づいて、相当長さおよび前記ピース間で周方向にずらした相当位置とされた関係で設定され、設定された順序で配置される。

Is set based on the relationship between the corresponding length and the corresponding position shifted in the circumferential direction between the pieces, and arranged in the set order.

  When the rotor or stator is divided into four (including 4n) rotor pieces or stator pieces, the axial lengths of the four rotor pieces or stator pieces that are ideally obtained by the above three formulas Are basically 0.29L, 0.71L, 0.71L, 0.29L, and the corresponding length is set based on this reference value, and the effective magnetic pole opening of each rotor piece or stator piece is set. The angle is the axis of the rotor piece or stator piece whose phase difference of electrical angle is π, 0.71L, 0.29L between the axial sections of the rotor piece or stator piece of 0.29L, 0.71L. A skew is continuously formed between the axial lengths of the rotor pieces or the stator pieces so that the phase difference of the electrical angle is −π between the directional cross sections, and 0.29L, 0.71L, and 0.71L. With a 0.29L rotor piece or stator piece, The queue is set to be continuous and shifted by the phase difference π of the electrical angle so that the skew is discontinuous on the adjacent surfaces of the 0.71L and 0.71L rotor pieces or stator pieces.

When the rotor or stator is divided into six (including 6n) rotor pieces or stator pieces, the axial lengths of the six rotor pieces or stator pieces that are ideally obtained by the above three formulas Are 0.25L, 0.5L, 0.25L, 0.25L, 0.5L, 0.25L, and the corresponding length is set based on this reference value, and each rotor piece or stator The effective magnetic pole opening angle of the piece is π in the half of the phase difference of the electrical angle between the axial cross sections of each rotor piece or stator piece in the circumferential direction of the rotor or stator, and in the other half A skew is continuously formed between the axial lengths of the rotor pieces or the stator pieces so as to be −π, and the rotor pieces or fixed pieces of 0.25L, 0.5L, and 0.25L divided into two at the center Each adjacent rotor piece or stator Continuous skew child piece, the center of 0.25 L,
The skew is set by shifting the phase difference π of the electrical angle so that the skew becomes discontinuous on the adjacent surface of the 0.25L rotor piece or stator piece.

  The phase difference of the electrical angle with respect to the rotational order of interest has been described above. However, the phase difference of the electrical angle with respect to other rotational orders is obtained by replacing π with γ and −π with −γ. .

  ADVANTAGE OF THE INVENTION According to this invention, the rotary electric machine which reduced the vibration and noise of the motor excited by radial direction electromagnetic excitation force among the vibration and noise which generate | occur | produce by drive operation can be provided.

  Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a partial cross-sectional perspective view of a rotating electrical machine including an embodiment of the present invention.
FIG. 2 is a diagram illustrating the orthogonal condition of the excitation force.
FIG. 3 shows a conceptual diagram of the stator core (stator) 7, and 8 shows a cross section in the axial direction of the stator core. FIG. 4 is a diagram showing F, M1, and M2 with respect to the orthogonal condition expression of each skew pattern.
In FIG. 1, the core of the rotor 1 is formed by stacking laminated steel plates, and the stacked steel plates are divided into a plurality of blocks, that is, rotor pieces in the axial direction. In FIG. 1, the rotor 1 has four rotor pieces 3, 4, 5, 6, a shaft 10, and a plurality of grooves having the same axial length as the rotor pieces 3, 4, 5, 6 in the circumferential direction. It is composed of secondary conductors 2 (2a, 2b, 2c, 2d) which are formed by obliquely skewing at equal pitches and having an effective magnetic pole opening angle formed by aluminum die casting or the like in the groove. In FIG. 1, it is the secondary conductor 2 that forms the effective magnetic pole opening angle. However, the effective magnetic pole opening angle may be realized by a permanent magnet.
Hereinafter, a skew pattern of electromagnetic excitation force realized by optimizing the configuration shown in FIG.

  The electrical angle determined by the axial length of the rotor pieces 3, 4, 5, and 6 and the circumferential position of the effective magnetic pole opening angle is determined by the following concept. In the present invention, a combination pattern of axial length and electrical angle phase difference is set such that the radial electromagnetic excitation force generated by the electrical characteristics is orthogonal to the axial mode of the stator core 7.

Assuming that the natural mode of the stator core 7 of the rotating electrical machine 100 in which vibration and noise are generated is the 0, 1, and 2nd bending modes of the beam, and consider the pattern of electromagnetic excitation force that suppresses the generation of this mode. .
For the sake of simplicity, the structural system is only the stator core 7, the axial length is 2 L, which is the same as the core axial length of the rotor 1, and the boundary condition of the stator core 7 is free at both ends or completely constrained at both ends. The axial lengths of the beam elements and the rotor pieces 3, 4, 5 and 6 are the same as the axial lengths of the secondary conductors 2 included in the rotor pieces 3, 4, 5 and 6. When the end ring exists in the rotor 1, the length of the end ring is not included in the shaft length 2L.

  Since each rotor piece 3, 4, 5, 6 is provided with a skew skew, the excitation force f (x) is a complex number. At this time, the following orthogonal conditions of the excitation force shown in FIG.

  In the above orthogonal condition, Equation 5 represents the beam bending mode 0th order, Equation 6 represents the beam bending mode primary, and Equation 7 represents the condition of the excitation force that does not excite the beam bending mode secondary. The vibration caused by the 0th, 1st and 2nd modes of beam bending can be suppressed.

  Formula 5, Formula 6, and Formula 7 are satisfied, and the axial length, skew angle, and circumferential position of each of the rotor pieces 3, 4, 5, and 6 are determined when a practical number is divided into four. Think about what to do.

  In order to simplify the development of the expression, the stator core 7 is a one-dimensional beam in the x-axis direction, and the force applied to the stator core 7 is a one-dimensional excitation force in the y-axis direction. The axial length of the stator core 7 is 2L.

  FIG. 5A shows a skew angle in which the electrical angle δ when the rotor 1 is divided into four parts is shifted by π between both ends of the rotor pieces 3, 4, 5, and 6. For the sake of simplicity, the excitation force f (x) is expressed by Equations 8 and 9.

  FIG. 5B shows the excitation force obtained by Equation 8 and Equation 9.

  The electrical angle δ in FIG.

  Further, Re {M1} of the moment M1 is expressed by Equation 11.

となる。
このときＩｍ｛Ｍ１｝は数式１２となる。

It becomes.
At this time, Im {M1} is expressed by Equation 12.

  Further, Re {M2} and Im {M2} are odd functions.

  The above relationship also holds when the stator core 7 is a cylindrical surface and the excitation force is an n-order three-dimensional excitation force of an annular shape centering on the x axis.

  Therefore, the rotor 1 has an axial length

  That is, the rotor pieces are divided into 0.29L, 0.71L, 0.71L, and 0.29L rotor pieces 3, 4, 5, and 6, and the phase difference of each electrical angle is the axis of each rotor piece 3 and 4. A skew is continuously formed so that π is between the cross-sections and −π is between the cross-sections of the rotor pieces 5 and 6 in the axial direction, and electricity in the adjacent faces of the rotor pieces 3, 4, 5 and 6 is formed. The angle phase difference is continuous, and the adjacent surfaces of 4 and 5 are discontinuous, and the electrical angle phase difference is π.

  Therefore, the absolute value of the skew angle of the rotor pieces 3 and 6 at both ends is larger than that of the central rotor pieces 4 and 5. As a result, the moment generated between the bending mode primary of the beam of the stator core 7 and the excitation force can be effectively canceled, and the effect of reducing vibration can be obtained even in a structure in which the skew switching position is shifted. be able to.

  Further, n times (n is an integer) of the configuration of FIG. 1 can also satisfy the orthogonal condition of FIG.

  FIG. 4 shows a summary of the values of F, M1, and M2 for the λ-shaped skew and other skew patterns. In the figure, no skew means that the rotor 1 or the stator core 7 is not divided and no skew is provided, and one-slot skew is between the axial cross sections of the rotor 1 or the stator core 7 in all axial lengths. In the case where the skew is provided so that the electrical angle phase difference becomes 2π continuously so as to be shifted by one slot, the V-shaped skew is a case where the skew is provided so as to be folded back at the center. These structures are known structures.

The electrical angle δ and the excitation force of 1 slot skew and V-shaped skew are shown in FIGS.
The average surface speed is obtained using the calculation model of the rotating electrical machine 100 shown in FIG. The calculation model of the rotating electrical machine 100 includes a frame 20 and a bracket 21 on the outer surface. The stator core 7 is shrink fitted on the inner periphery of the frame 20. The rotor 1 is provided inside the rotating electrical machine 100 via a bearing fitted in the bracket.

  FIG. 9 shows the frequency response of the average surface velocity when a radial excitation force having a constant amplitude is input in the zero-order axial direction of the torus with no skew, one slot skew, V-shaped skew, and λ-shaped skew.

  FIG. 10 shows the frequency response of the surface velocity average when a radial excitation force having a constant amplitude is input in the axial direction of the 0th order of the circular ring by λ-shaped skew, W-shaped skew, and lightning-type skew.

  FIG. 11 shows the maximum amplitude of the surface velocity average when each skew is input. The λ-shaped skew has a surface velocity average at a peak frequency of 3.7 to 8 dB lower than other skews, and has a vibration reducing effect.

  Next, the effect when a tolerance is provided at the switching position of the λ-shaped skew will be examined.

  FIG. 12 shows the maximum amplitude of the surface velocity average when the switching position of P1 is changed from −8% to + 16% of the axial length 2L of the rotor core with respect to the 0.29 L piece. The surface velocity average takes a minimum value at + 4%, and is between -4% and + 16%, which is lower than the maximum amplitude of surface velocity average of 94.2 dB for W-shaped skew and lightning-type skew. There is a vibration reduction effect.

  FIG. 13 shows the maximum amplitude of the surface speed average when the switching position of P2 is changed from −8% to + 8% of the axial length 2L of the rotor core with respect to the 0.71 L piece. In this tolerance range, the maximum amplitude of the surface velocity average hardly changes, and even if the center skew switching position is shifted, there is a vibration reducing effect.

  The configuration of this embodiment also has an effect of reducing the thrust force.

Another embodiment of the present invention will be described.
FIG. 14 is a diagram showing an embodiment of the rotor 1 and the stator 7 when an induction motor is taken as an example of the rotating electrical machine 100 according to the present invention.
In FIG. 14, the core of the rotor 1 is formed by stacking laminated steel plates, and the stacked steel plates are divided into a plurality of blocks, that is, rotor pieces in the axial direction. In FIG. 14, the rotor 1 is composed of six rotor pieces 31, 32, 33, 34, 35 and 36. A plurality of grooves having the same axial length as the shaft 10 and the rotor pieces 31, 32, 33, 34, 35, and 36 are skewed obliquely at equal intervals in the circumferential direction, and the grooves are formed by aluminum die casting or the like. The secondary conductors 2a, 2b, 2c, 2d, 2e, and 2f having the formed effective magnetic pole opening angles are provided. 7 is a stator.

  In the embodiment of FIG. 14, the secondary conductor 2 forming the effective magnetic pole opening angle is formed to be continuous between 2a, 2b, and 2c, and between 2d, 2e, and 2f, but between 2c and 2d, For example, it is formed at a position shifted in the circumferential direction by 1/2 pitch so that the angle is shifted by π. Further, the secondary conductor 2 may have a structure in which R is attached to the connecting portion so that aluminum die casting or the like flows between 2a, 2b and 2c and between 2d, 2e and 2f. In FIG. 14, the effective magnetic pole opening angle is formed by the secondary conductor 2, but a configuration in which the effective magnetic pole opening angle is realized by a permanent magnet may be used.

  Hereinafter, the electromagnetic excitation force skew pattern realized by optimizing the configuration shown in FIG. 14 will be referred to as six-divided optimization skew.

  The electrical angle determined by the axial length of the rotor pieces 31, 32, 33, 34, 35, 36 and the circumferential position of the effective magnetic pole opening angle is determined in the same way as in the first embodiment. .

  Hereinafter, the coordinate system for expanding the equations is the same as in the first embodiment.

  If the electrical angle δ when the rotor 1 is divided into six parts is provided with a skew angle shifted by π between both ends of each of the rotor pieces 31, 32, 33, 34, 35, 36, FIG. . For simplicity, the excitation force f (x) is expressed by Equations 14 and 15.

  FIG. 15 (b) shows the excitation force obtained by Expressions 14 and 15.

  The electrical angle δ in FIG.

  Further, Re {M1} of the moment M1 is expressed by Equation 17.

  Now, when Re {M1} = 0,

となる。これを満足する値はたとえばａ＝０.２５，ｂ＝０.７５である。

It becomes. Values satisfying this are, for example, a = 0.25, b = 0.75.

  At this time, Im {M1} is expressed by Equation 19.

  Further, Re {M2} and Im {M2} are odd functions.

  The above relationship also holds when the stator core 7 is a cylindrical surface and the excitation force is an n-order three-dimensional excitation force of an annular shape centering on the x axis.

  Therefore, the rotor 1 is divided into rotor pieces 31, 32, 33, 34, 35, and 36 having axial lengths of 0.25L, 0.50L, 0.25L, 0.25L, 0.50L, and 0.25L. The phase difference of each electrical angle is continuous so that it is π between the axial sections of the rotor pieces 31, 32, 33 and −π between the axial sections of the rotor pieces 34, 35, 36. Thus, a skew is formed so that the electrical angle phase difference between adjacent faces of the rotor pieces 31 and 32 and 33, 34 and 35 and 36 is continuous, and the electrical angle phase difference between the adjacent faces of 33 and 34 is π. To form.

  Further, n times (n is an integer) of the configuration of FIG. 14 can also satisfy the orthogonal condition of FIG.

  Using the calculation model of the rotating electrical machine 100 shown in FIG. 8, a radial excitation force having a constant amplitude is input in the axial direction of the 0th order of the circular ring with no skew, 1 slot skew, V-shaped skew, and 6-divided optimization skew. FIG. 16 shows the frequency response of the average surface velocity.

  FIG. 17 shows the frequency response of the average surface velocity when a radial excitation force having a constant amplitude is input in the axial direction of the 0th order of the ring by the 6-part optimization skew, the W-shaped skew, and the lightning-type skew. .

  FIG. 18 shows the maximum amplitude of the surface velocity average when each skew is input. The six-divided optimization skew has a surface velocity average at the peak frequency that is 8.9 to 15.5 dB lower than the other skews, and has a vibration reduction effect.

  Next, the surface speed average when the phase switching position is changed by several percent of the axial length 2L of the rotor core will be examined.

  FIG. 19 shows the average surface speed when P1 is switched at the peak frequency, FIG. 20 shows the average surface speed when P2 is switched, and FIG. 21 shows the average surface speed when P3 is switched. From these figures, even if the switching position is changed by ± 4%, the change amount of the average surface speed becomes ± 7.3 dB, and the vibration reduction effect can be obtained more than other skews. If the switching position is changed by ± 8%, the average surface speed when P1 is switched increases by 10 dB at −8%, and the vibration reduction effect is reduced.

  Even if the rotor pieces 31, 32, 33, 34, 35, and 36 are formed in a slightly dispersed state with the ideal values changed, as long as they are based on the optimized shaft length and electrical angle conditions, 6 The division optimization skew has a vibration reduction effect.

  In the first and second embodiments, the configuration of the rotating electrical machine alone has been described. However, vibration and noise can also be reduced with a configuration incorporating these rotating electrical machines.

  The configuration shown in FIG. 22 includes a rotating electrical machine 100 and an inverter 200. 23 is a cross-sectional view of a compressor 300 in which the rotating electrical machine 100 is incorporated.

  Moreover, although it is a structure of a skew, if the axial direction mode and electromagnetic excitation force of the stator core of FIG. 2 satisfy orthogonal conditions, it may be a curve instead of a straight line.

  The W-shaped skew is shown in FIG. 24, and the lightning-type skew is shown in FIG. 25 according to Japanese Patent Laid-Open No. 8-298735. FIG. 26 shows a list of skew structures to be compared.

It is a perspective view of the rotor for rotary electric machines provided with one Example of this invention. It is a figure which shows the orthogonal condition which the axial direction mode and electromagnetic excitation force of the stator core of a rotary electric machine should satisfy. It is a figure which shows the positional relationship of a stator core and a stator core axial cross section. It is a figure which shows the value of F, M1, M2 with respect to the orthogonal conditional expression of each skew pattern. It is the figure which showed the electrical angle and excitation force of (lambda) character skew. It is the figure which showed the electrical angle and excitation force of 1 slot skew. It is the figure which showed the electrical angle and excitation force of V-shaped skew. It is the figure which showed the model of the rotary electric machine 100 used for calculating a surface speed average. FIG. 6 is a diagram showing an average surface velocity when no skew, 1 slot skew, V-shaped skew, and λ-shaped skew are input to the rotating electrical machine 100 model. FIG. 5 is a diagram showing an average surface velocity when λ-shaped skew, W-shaped skew, and lightning-type skew are input to the rotating electrical machine 100 model. FIG. 6 is a diagram showing the maximum value of the average surface velocity when no skew, 1 slot skew, V-shaped skew, λ-shaped skew, W-shaped skew, and lightning-type skew are input to the rotating electrical machine 100 model. It is the figure which showed the maximum value of the surface speed average at the time of changing skew switching position P1 by (lambda) character skew. It is the figure which showed the maximum value of the surface speed average at the time of changing skew switching position P2 by (lambda) character skew. It is a figure which shows the rotary electric machine provided with the other Example of this invention. It is the figure which showed the electrical angle and excitation force of 6 division | segmentation optimization skew. FIG. 6 is a diagram showing the surface speed when no skew, 1 slot skew, λ-shaped skew, and 6-divided optimization skew are input to the rotating electrical machine 100 model. FIG. 6 is a diagram showing an average surface velocity when 6-divided optimization skew, W-shaped skew, and lightning-type skew are input to the model of the rotating electrical machine 100. FIG. 5 is a diagram showing the maximum value of the average surface velocity when no skew, 1 slot skew, V-shaped skew, 6-divided optimization skew, W-shaped skew, and lightning-type skew are input to the rotating electrical machine 100 model. It is a figure which shows the result of having calculated the vibration speed by shifting the skew switching position P1 of 6 division | segmentation optimization skew. It is a figure which shows the result of having calculated the vibration speed by shifting the skew switching position P2 of 6 division | segmentation optimization skew. It is a figure which shows the result of having calculated the vibration speed by shifting the skew switching position P3 of 6 division | segmentation optimization skew. It is a figure which shows the structure which consists of the rotary electric machine and inverter which become this invention. It is a figure which shows the structure of the compressor incorporating the rotary electric machine which becomes this invention. It is a figure which shows the structure of the rotor of a W-shaped skew. It is a figure which shows the structure of the rotor of a lightning bolt type skew. It is a figure which shows the list of skews.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Rotor, 2 (2a, 2b, 2c, 2d, 2e, 2f) ... Secondary conductor, 3, 4, 5, 6, 31, 32, 33, 34, 35, 36 ... Rotor piece, 7 ... Stator core (stator), 8 ... stator core axial cross section, 10 ... shaft, 20 ... frame, 21 ... bracket, 100 ... rotating electric machine, 200 ... inverter, 300 ... compressor.

Claims (10)

In a rotating electrical machine including a rotor and a stator having a plurality of slots,
The rotor is divided into a plurality of rotor pieces in the axial direction, and each of the divided rotor pieces is a combination of an axial length and an absolute value of a skew angle, and one rotor piece is at least one other rotation. A rotating electrical machine having a different configuration from the combination of the axial length of a child piece and the absolute value of a skew angle. In a rotating electrical machine including a rotor and a stator having a plurality of slots,
The stator is axially divided into a plurality of stator pieces, and each of the divided stator pieces is a combination of axial length and skew angle absolute value, and one stator piece is at least one other fixed piece. A rotating electrical machine having a different configuration from the combination of the axial length of a child piece and the absolute value of a skew angle. In the rotating electrical machine according to claim 1,
The rotor is divided into two regions at the central portion of the axial length, and when the left side is an A region and the right side is a B region, the signs of skew angles of the A region and the B region are different. The rotating electrical machine according to claim 2,
The stator is divided into two regions at the center of the axial length, and the left side is an A region, and the right side is a B region, the sign of the skew angle between the A region and the B region is different. In the rotating electrical machine according to claim 1,
The rotor is divided into 3n (n is a multiple of 2), and when the three are set as a set, the left side is the D region, the center is the E region, and the right side is the F region, the absolute value of the skew angle of the E region is D A rotating electrical machine characterized by being smaller than the absolute value of the skew angle of the region and the F region and having the same sign of the skew angle of the D region, the E region, and the F region. The rotating electrical machine according to claim 2,
When the stator is divided into 3n (n is a multiple of 2) and the three are set as one set, the left side is the D region, the center is the E region, and the right side is the F region. A rotating electrical machine characterized by being smaller than the absolute value of the skew angle of the region and the F region and having the same sign of the skew angle of the D region, the E region, and the F region. In the rotating electrical machine according to claim 1,
The rotor is divided into four rotor pieces in the axial direction, and the length and skew angle of each rotor piece are 0.29L, 0.71L, 0.71L, Based on the length of 0.29L, the rotor piece of 0.29L is -4% to +
The piece of 16%, 0.71L is set to any length in the range of + 4% to -16% of the axial length 2L of the rotor core,
The effective magnetic pole opening angle of the two rotor pieces constituting the axial length L continuously forms a skew in each rotor piece, and the electrical angle phase difference between the axial sections of the two rotor pieces. Are the same, and the skew between the two rotor pieces is continuously arranged,
The two rotor pieces constituting the remaining half of the axial length L are arranged so that the two rotor pieces constituting the axial length L are symmetrical at the center of the axial length of the rotor core. In such a case, the electrical angle phase difference between the two ends of the rotor piece is shifted in the circumferential direction so that the skew becomes discontinuous at the center of the axial length of the rotor core. Rotating electric machine. The rotating electrical machine according to claim 2,
The stator is divided into four stator pieces in the axial direction, and the length and skew angle of each stator piece are 0.29L, 0.71L, 0.71L, Based on the length of 0.29L, the stator piece of 0.29L is -4% to + 2% of the axial length of the stator core.
The stator piece of 16%, 0.71L is set to any length in the range of + 4% to -16% of the axial length 2L of the stator core,
The effective magnetic pole opening angles of the two stator pieces constituting the axial length L continuously form a skew in the stator pieces, and the electrical angle phase difference between the axial sections of the two stator pieces is Same, the skew is placed continuously between the two stator pieces,
The two stator pieces constituting the remaining half of the axial length L are arranged so that the two stator pieces constituting the axial length L are symmetrical at the center of the axial length of the stator core. In such a case, the electrical angle phase difference between the two ends of the stator piece is shifted in the circumferential direction so that the skew is discontinuous at the center of the axial length of the stator core. Rotating electric machine. In the rotating electrical machine according to claim 1,
The rotor is divided into six rotor pieces in the axial direction, and the length and skew angle of each rotor piece are 0.25L, 0.5L, 0.25L, Based on the lengths of 0.25L, 0.5L, and 0.25L, it is set to any length within a range of ± 4% of the axial length 2L of the rotor core,
The effective magnetic pole opening angles of the three rotor pieces constituting the axial length L are continuously skewed by the rotor pieces, and the electrical angle phase difference between both ends of the three rotor pieces is the same. The skew is arranged continuously between the three rotor pieces,
The three rotor pieces constituting the remaining half of the axial length L are symmetrical with respect to the center of the axial length of the rotor core with respect to the three rotor pieces constituting the axial length L. It is characterized in that the arranged one is shifted by the same electrical angle phase difference as the electrical angle phase difference between both ends of the rotor piece in the circumferential direction so that the skew is discontinuous at the center of the axial length of the rotor core. Rotating electric machine. The rotating electrical machine according to claim 2,
The stator is divided into six stator pieces in the axial direction, and the length and skew angle of each stator piece are 0.25L, 0.5L, 0.25L, Based on the lengths of 0.25L, 0.5L, and 0.25L, it is set to any length within a range of ± 4% of the axial length 2L of the stator core,
The effective magnetic pole opening angles of the three stator pieces constituting the axial length L are continuously skewed by the stator pieces, and the electrical angle phase difference between both ends of the three rotor pieces is the same. The skew is arranged continuously between the three stator pieces,
The three stator pieces constituting the remaining half of the axial length L are symmetrical with respect to the center of the axial length of the stator core with respect to the three stator pieces constituting the axial length L. It is characterized in that the arranged one is shifted by the same electrical angle phase difference as the electrical angle phase difference between both ends of the stator piece in the circumferential direction so that the skew is discontinuous at the center of the axial length of the stator core. Rotating electric machine.

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