JP6458641B2 - Stator and rotating electric machine - Google Patents

Description

  The present invention relates to a stator having at least a yoke and a plurality of teeth, and a rotating electrical machine including the stator.

  Conventionally, an example of a technique related to a stator that effectively reduces cogging torque and suppresses reduction of effective magnetic flux has been disclosed (see, for example, Patent Document 1). The stator includes a bridging portion that connects radially inner ends of a plurality of iron core portions, and the bridging portion has a thin portion formed thinner than the thickness of the core sheet. When the thickness of the core sheet is t and the thickness of the thin portion is T, the thickness of the thin portion is 0.2t ≦ T <t.

JP 2003-088007 A

  However, when the technique described in Patent Document 1 is applied to a switched reluctance motor (hereinafter simply referred to as “SR motor”), there are the following problems. The first problem is that the rigidity of the thin part provided in the bridging part is lower than that of the part where the thin part is not provided, so that the rigidity of the entire stator is also reduced, and vibration and noise may occur. The second problem is that since the iron core portion and the bridge portion are smoothly connected in the circumferential direction, there is a leakage magnetic flux that leaks from the rotor to the bridge portion, and the saliency is reduced.

  The present invention has been made in view of these points, and a first object is to maintain saliency. The second purpose is to maintain the rigidity of the entire stator.

Is made the inventions to solve the above problems, the stator having a yoke, a plurality of teeth extending from the yoke in a radial direction, a plurality of slots formed therebetween of the teeth adjacent to each other in the circumferential direction, the and the iron core, in a stator and a stator winding wound is accommodated in said slot, said stator core is provided apart by a predetermined distance from the tip of the teeth on the yoke side, circumferentially adjacent and a rib for connecting the cross of the teeth, have a, a flux barrier that inhibits magnetic flux that flows between the ribs, circumferential width between the end face and the end face of the flux barrier of the teeth (W2) Is formed smaller than the radial width (W1) of the rib .

  According to this configuration, since the rib is provided at a predetermined distance from the tip of the tooth toward the yoke, the leakage magnetic flux leaking from the rotor to the rib is suppressed to a negligible level. Therefore, saliency can be maintained.

  According to this configuration, the flux barrier inhibits the magnetic flux flowing between the teeth and the ribs, so that the leakage magnetic flux leaking from the magnetic flux flowing between the stator and the rotor to the ribs can be suppressed.

  According to a third aspect of the present invention, the flux barrier includes a polygonal shape including a polygon having a triangle shape or more, a circular shape including a circular shape or a sector shape, or a combined shape obtained by combining the polygonal shape and the circular shape. It is formed by the through hole which becomes.

  According to this configuration, the flux barrier may be formed by a through hole having a certain shape, and thus the stator can be easily manufactured without going through a complicated process.

  The fourth invention is characterized in that a circumferential width between an end face of the teeth and an end face of the flux barrier is formed to be smaller than half of a radial width of the rib.

  According to this configuration, the circumferential width between the end face of the teeth and the end face of the flux barrier is smaller than half of the radial width of the rib. Magnetic saturation is more likely to occur between the end face of the teeth and the end face of the flux barrier than the rib, so that leakage magnetic flux that leaks from the magnetic flux flowing between the stator and the rotor to the rib can be more reliably suppressed.

  According to a fifth aspect of the present invention, in the rotating electrical machine, the stator according to any one of claims 1 to 8 and a rotor that is rotatably supported are provided.

  According to this configuration, it is possible to provide a rotating electrical machine that can maintain the saliency or maintain the rigidity of the entire stator.

  The “yoke” is a soft magnetic material formed in an annular shape (including a cylindrical shape). The “tooth” is a portion formed extending (or protruding) from the yoke in the radial direction, and is also called “magnetic pole tooth”, “tooth”, or the like. A “slot” is a space formed between adjacent teeth, and is a portion in which a stator winding is accommodated. The “rib” is also called “bridge”, “bridge”, or the like, regardless of the shape as long as it can connect the teeth adjacent in the circumferential direction. The “flux barrier” may be arbitrarily configured as long as it is a magnetic barrier that inhibits the magnetic flux flowing between the teeth and the ribs. The “rotary electric machine” is arbitrary as long as it is a device having a rotating part (for example, a shaft or a shaft). For example, a generator, a motor, a motor generator, and the like are applicable. The rotor (rotor) may be an inner rotor type arranged on the inner diameter side of the stator (stator), or the outer rotor type arranged on the outer diameter side of the stator.

It is a perspective view which shows typically the 1st structural example of a stator iron core. It is a top view which shows typically the 1st structural example of a stator iron core. It is a graph which shows the example of a relationship between a torque fall rate and a rib position. It is a graph which shows the example of a relationship between a natural frequency and a rib position. It is a graph which shows the example of a relationship between a natural frequency and a rib position. It is a perspective view which shows typically the 2nd structural example of a stator iron core. It is a top view which shows typically the 2nd structural example of a stator iron core. It is a top view which shows the example of shaping | molding of teeth. It is a graph which shows the example of a relationship between a torque fall rate and a width ratio. It is a perspective view which shows typically the 3rd structural example of a stator iron core. It is a top view which shows typically the 3rd structural example of a stator iron core. It is a perspective view which shows typically the 4th structural example of a stator iron core. It is a top view which shows typically the 4th structural example of a stator iron core. It is a side view which shows typically the accommodation process of a segment conductor. FIG. 15 is a plan view schematically showing a configuration example of the stator as seen from the XV direction in FIG. 14. It is a side view which shows the example of a connection of segment conductors typically. It is sectional drawing which shows the structural example of a rotary electric machine typically. It is a graph which shows the example of a relationship between a torque fall rate and an electric current. It is a graph which shows the example of a relationship between a torque reduction rate ratio and an electric current. It is a graph which shows the example of a difference of a natural frequency. It is a top view which shows typically the 5th structural example of a stator iron core. It is a top view which shows typically the 6th structural example of a stator iron core. It is a top view which shows typically the 7th structural example of a stator iron core. It is a top view which shows typically the 8th structural example of a stator iron core. It is a top view which shows typically the 8th structural example of a stator iron core.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. Note that unless otherwise specified, “connecting” means electrically connecting. Each figure shows elements necessary for explaining the present invention, and does not necessarily show all actual elements. When referring to directions such as up, down, left and right, the description in the drawings is used as a reference.

  Alphanumeric continuous codes are abbreviated using the symbol “˜”. Unless otherwise specified, the letter of the sign means another element in uppercase and lowercase letters. For example, the stator iron core 10A shown in FIG. 1 and the electromagnetic steel sheet 10a shown in FIG. 14 are separate elements. “Wound” means to wind, and is used synonymously with “winding” to wind. Unless otherwise specified, “outer diameter side” means the outer side or outer peripheral side in the radial direction, and “inner diameter side” means the inner side or inner peripheral side in the radial direction. In the first to fifth embodiments, an inner rotor type rotating electrical machine will be described.

[Embodiment 1]
The first embodiment will be described with reference to FIGS. A stator iron core 10A shown in FIG. 1 is a component of the stator 30 shown in a fifth embodiment (FIGS. 15 to 17) described later, and is an example of the stator iron core 10. The stator iron core 10A has, for example, a pole number m of “24” and includes a tooth 11, a yoke 13, a rib Rb1, and the like.

  The yoke 13 is a part formed in an annular shape (including a cylindrical shape). The plurality of teeth 11 are portions that extend from the yoke 13 in the radial direction. The plurality of slots 12 are spaces formed between the teeth 11 adjacent to each other in the circumferential direction, and are portions that accommodate stator windings 20 (see FIGS. 14 to 17) described later. The number of phases p of the stator winding 20 is “3”, for example.

  The slot 12 of this embodiment may be formed so that the radial surfaces SF1 and SF2 corresponding to the radial sides of the teeth 11 are parallel to each other. If formed in this way, it becomes easy to accommodate the stator winding 20 (see FIGS. 14 to 17) having a square cross section, and the space factor is increased. The space factor is a ratio of the stator winding 20 occupying the slot 12.

  The rib Rb1 is an example of the rib Rb. The rib Rb1 is a portion that connects the teeth 11 adjacent to each other in the circumferential direction in the stator core 10A. The rib Rb1 shown in FIG. 2 is provided a predetermined distance t away from the tip surface 11a of the tooth 11 disposed on the inner diameter side on the yoke 13 side (that is, the outer diameter side). The tip surface 11a corresponds to a “tip”. In order to increase the space factor, the ribs Rb1 may be connected to each other between the teeth 11 so as to be orthogonal to the radial surfaces SF1 and SF2 of the teeth 11.

  Here, the length in the radial direction of the teeth 11 is defined as a teeth length T. A value (t / T) obtained by dividing the predetermined distance t by the tooth length T is defined as a rib position P. That is, P = t / T. The relationship between the rib position P and the torque reduction rate Rt is, for example, a line graph shown in FIG.

  In FIG. 3, a rib position P10 at which the rib position P is 0 [%] is a stator having a closed slot structure in which the rib Rb1 is formed with a curved surface so that the tip end surface 11a of the tooth 11 is smooth (hereinafter simply referred to as “closed” This is referred to as a “slot structure stator”. The rib position P16 at which the rib position P is 100% is an open slot structure stator (hereinafter simply referred to as “open slot structure stator”) in which the rib Rb1 is not provided.

  According to the characteristic line CL1 shown in FIG. 3, the torque reduction rate Rt12 is obtained at the rib position P10 under the influence of the leakage magnetic flux φe. Leakage magnetic flux φe is a magnetic flux that leaks between teeth 11 and rotor 40 (see FIGS. 8 and 17) via rib Rb1 (see FIG. 2).

  When the predetermined distance t is increased, the torque reduction rate Rt rapidly decreases, and the torque reduction rate Rt11 is reached at the rib position P11 (for example, 5 [%]) (Rt11 <Rt12). However, even if the predetermined distance t is set to the rib positions P12 to P15 larger than the rib position P11, the torque decrease rate Rt11 hardly changes.

  The relationship between the rib position P and the natural frequency fc is, for example, a bar graph shown in FIGS. The natural frequency fc at the rib positions P10 to P15 is shown for each of the circular 0th natural frequency, the circular secondary natural frequency, the circular tertiary natural frequency,. The order n that greatly affects the vibration and noise of the stator 30 is an order obtained by dividing the number m of poles by the number p of phases (that is, n = m / p). In this embodiment, since the number of poles m is “24” and the number of phases p is “3”, n = m / p = 8, which corresponds to the eighth natural frequency of the ring.

  The circular zero-order natural frequency shown in FIG. 4 becomes the natural frequency fc11 at the rib position P10, and becomes the natural frequency fc12 at the rib positions P11 to P15 larger than the rib position P10. There is almost no difference between the natural frequency fc11 and the natural frequency fc12.

  On the other hand, the annular eighth-order natural frequency shown in FIG. 5 becomes the natural frequency fc14 at the rib position P10, and hardly changes from the natural frequency fc14 at the rib positions P11 and P12. However, when the position is made larger than the rib position P12 (for example, 10 [%]), the natural frequency fc13 is reached at the rib position P13, and the natural frequency fc is rapidly decreased. The circular secondary natural frequency, the circular tertiary natural frequency,..., The circular natural frequency were the same as the circular eighth natural frequency. Therefore, it is shown that vibration and noise can be reduced also at the rib positions P11, P12, and P13 where the flux barrier 14 is provided.

  In order to suppress vibration and noise caused by energization, the position of the rib Rb may be set in consideration of the results shown in FIGS. That is, the teeth length T and the predetermined distance t may be set so as to satisfy P11 ≦ P ≦ P12. In addition, the specific numerical value of rib position P11, P12 changes according to the form (a dimension, a shape, material, etc.) of 10 A of stator cores including rib Rb.

[Embodiment 2]
The second embodiment will be described with reference to FIGS. For simplicity of illustration and description, unless otherwise specified, the same elements as those used in the first embodiment are denoted by the same reference numerals and description thereof is omitted. Therefore, differences from the first embodiment will be mainly described.

  A stator core 10B shown in FIGS. 6 and 7 is an example of the stator core 10. The stator iron core 10B includes a tooth 11, a yoke 13, a rib Rb1, a flux barrier 14A, and the like. The stator core 10B is further provided with a flux barrier 14A as compared with the stator core 10A shown in the first embodiment.

  The flux barrier 14 </ b> A is an example of the flux barrier 14. This flux barrier 14 </ b> A is provided in the tooth 11, and is a through hole whose plane (or cross section) is a quadrangular shape. The rectangular shape corresponds to a “predetermined shape” and includes a rectangular shape (rectangular shape) and a square shape. As shown in FIG. 7, the distance (length) in the thickness direction of the rib Rb1 is defined as “radial width W1”. A portion that is narrowed between the end surface (radial surface SF1, SF2) of the tooth 11 and the inner end surface of the flux barrier 14 is referred to as a “connection portion 11b”. The distance (length) in the circumferential direction applied to the connection site 11b is defined as “circumferential width W2.” The circumferential width W2 is also a gap between the rib Rb1 and the flux barrier 14A. The circumferential width W2 may be set to be smaller than the radial width W1 (W2 <W1), and preferably set to be smaller than half of the radial width W1 (W2 <W1 / 2). . The radial width W1 of the rib Rb1 may be set to a value that does not (or can be ignored) vibration or noise caused by energization.

  As shown in FIG. 8, a magnetic flux φsr flows between the teeth 11 constituting the stator 30 and the rotor 40. A leakage flux φt flows between the teeth 11 adjacent in the circumferential direction via the rib Rb1. As the circumferential width W2 is set smaller, the leakage flux φt becomes smaller because the flow of the leakage flux φt is hindered. On the other hand, as the circumferential width W2 is set smaller, the thickness of the connection portion 11b is reduced and the rigidity is lowered. Considering these, it is preferable to set the circumferential width W2 so as to keep the leakage flux φt small and to secure a desired rigidity for the connection portion 11b.

  Here, the distance between the center in the circumferential direction of the tooth 11 indicated by the one-dot chain line and the end face (on the slot 12 side) of the flux barrier 14A is defined as “circumferential width W3”. A distance between both end faces in the circumferential direction of the flux barrier 14A is defined as a “circumferential width W4”. A ratio (W4 / W3) obtained by dividing the circumferential width W4 by the circumferential width W3 is defined as “width ratio Q”. That is, Q = W4 / W3.

  The relationship between the torque reduction rate Rt and the width ratio Q is as shown in FIG. In the width ratio Q10 in which the width ratio Q is 0 [%], the flux barrier 14A is not formed on the teeth 11 (see FIGS. 1 and 2). As the width ratio Q increases, the flux barrier 14 </ b> A increases toward the center of the tooth 11 as indicated by a two-dot chain line. The width ratio Q15 in which the width ratio Q is 100 [%] is formed by combining the left and right flux barriers 14A shown in FIG.

  According to the characteristic line CL2 shown in FIG. 9, the torque reduction rate Rt21 remains below the width ratio Q11 (for example, 10 [%]). The torque reduction rate Rt gradually increases from the width ratio Q11, becomes the torque reduction rate Rt22 at the width ratio Q12 (for example, 30 [%]), becomes the torque reduction rate Rt23 at the width ratio Q13, and becomes the width ratio Q14. Becomes the torque reduction rate Rt24.

  In order to suppress the decrease in torque, the circumferential width W4 of the flux barrier 14A may be set in consideration of the result shown in FIG. That is, the circumferential width W4 may be set so as to satisfy Q10 <Q ≦ Q12. Desirably, the circumferential width W4 may be set to satisfy Q10 <Q ≦ Q11. The width ratios Q11 and Q12 both correspond to “predetermined ratios”, and vary depending on the form (size, shape, material, etc.) of the stator core 10B.

[Embodiment 3]
The third embodiment will be described with reference to FIGS. For simplicity of illustration and description, unless otherwise specified, the same elements as those used in the first and second embodiments are denoted by the same reference numerals and description thereof is omitted. Therefore, differences from Embodiments 1 and 2 will be mainly described.

  A stator iron core 10 </ b> C shown in FIGS. 10 and 11 is an example of the stator iron core 10. The stator core 10C includes a tooth 11, a yoke 13, a rib Rb1, a flux barrier 14B, and the like. The stator core 10C is further provided with a flux barrier 14B as compared to the stator core 10A shown in the first embodiment.

  The flux barrier 14B is different in shape from the flux barrier 14A shown in the second embodiment. In other words, the flux barrier 14A is a rectangular through hole, whereas the flux barrier 14B is a through hole having a triangular plane (or cross section).

  The relationship between the radial width W1 and the circumferential width W2 and the width ratio Q (see FIG. 9) are the same as in the second embodiment. Therefore, it may be set similarly to the second embodiment.

[Embodiment 4]
The fourth embodiment will be described with reference to FIGS. For simplicity of illustration and description, unless otherwise specified, the same elements as those used in the first to third embodiments are denoted by the same reference numerals and description thereof is omitted. Therefore, differences from Embodiments 1 to 3 will be mainly described.

  A stator iron core 10 </ b> D shown in FIGS. 12 and 13 is an example of the stator iron core 10. The stator core 10D includes a tooth 11, a yoke 13, a rib Rb1, a flux barrier 14C, and the like. The stator iron core 10D is further provided with a flux barrier 14C as compared with the stator iron core 10A shown in the first embodiment.

  The flux barrier 14C is different in shape from the flux barrier 14A shown in the second embodiment and the flux barrier 14B shown in the third embodiment. That is, the flux barrier 14A is a rectangular through-hole and the flux barrier 14B is a triangular through-hole, whereas the flux barrier 14C is a through-hole whose plane (or cross section) is an arc. The arc shape corresponds to a “circular shape”.

  The relationship between the radial width W1 and the circumferential width W2 and the width ratio Q (see FIG. 9) are the same as in the second embodiment. Therefore, it may be set similarly to the second embodiment.

[Embodiment 5]
Embodiment 5 will be described with reference to FIGS. For simplicity of illustration and description, unless otherwise specified, the same elements as those used in Embodiments 1 to 4 are denoted by the same reference numerals and description thereof is omitted. Therefore, the points different from the first to fourth embodiments will be mainly described.

  The example which manufactures the stator 30 and the rotary electric machine 100 using the stator core 10 mentioned above is demonstrated. As the stator core 10, any one of the stator cores 10A to 10D may be applied, or a stator core 10 formed by combining two or more flux barriers 14 may be applied. The stator core 10 may be formed by lamination using a plurality of electromagnetic steel plates 10a as shown in FIG. 14, or may be formed by a single piece of soft magnetic material.

  FIG. 14 shows a process of accommodating the segment conductor 21 that is a part of the stator winding 20 in the stator core 10 configured as described above. There are many segment conductors 21 constituting the stator winding 20, and they are formed in a predetermined shape. In other words, the stator winding 20 is composed of segment conductors 21 divided into a large number. The predetermined shape may be any shape, and in this embodiment, a U-shape shown in FIG. 14 is applied.

  As shown in FIG. 14, the segment conductor 21 is moved along the direction of the arrow D <b> 1 (axial direction) and accommodated in the slot 12. The state after the accommodation is shown in FIG. When the radial surfaces SF1 and SF2 are formed in parallel, the segment conductors 21 can be easily aligned and accommodated in the slot 12 as shown in FIG. The stator 30 shown in FIG. 15 is an example manufactured using the stator core 10 </ b> B as the stator core 10.

  The segment conductor 21 accommodated in the slot 12 in the axial direction connects the end portions 21a to each other on the axially outer side (coil end) of the stator core 10 as in the connection portion J shown in FIG. The connection method is arbitrary as long as it is conductive, and for example, joining such as welding or soldering is applicable. The stator winding 20 is wound around the stator core 10 by connecting a number of segment conductors 21 to each other. In this way, the stator 30 shown in FIG. 15 can be manufactured.

  The rotating electrical machine 100 shown in FIG. 17 can be manufactured by assembling the stator 30 and the rotor 40 described above into the housing 101. The rotating electrical machine 100 includes a housing 101, a bearing 102 (bearing), a rotating shaft 105, and the like in addition to the stator 30 and the rotor 40. The rotor 40 may be a magnet or not. The rotor 40 of this embodiment is formed of a soft magnetic material that does not have a magnet.

  The stator 30 includes a stator core 10 and a stator winding 20. The rotor 40 is rotatably disposed on the inner diameter side of the stator 30 via a gap. The rotor 40 may be configured in any way as long as the magnetic flux φsr (see FIG. 8) flows and rotates with the stator 30. The rotating shaft 105 is rotatably supported by the housing 101 via the bearing 102. The rotating shaft 105 is fixed directly or indirectly to the rotor 40 or is integrally formed with the rotor 40. In any case, the rotating shaft 105 and the rotor 40 rotate integrally. The housing 101 includes a frame, a housing, and the like, and may be formed of any shape or material as long as it can accommodate the stator 30, the rotor 40, the rotating shaft 105, and the like.

  The control device 104 is a device that controls the rotation of the rotating electrical machine 100 (specifically, the rotor 40), and corresponds to, for example, an ECU (Electronic Control Unit) or a computer. The control device 104 includes at least an inverter that converts electric power, and may further include a converter that converts voltage. The rotating electrical machine 100 (that is, the end of the stator winding 20) and the control device 104 are connected by a connection line 103.

  The characteristic concerning the rotary electric machine 100 comprised as mentioned above is demonstrated, referring FIGS. 18-20. FIG. 18 shows an example of characteristic lines CL3 and CL4 in which the vertical axis represents the torque reduction rate Rt and the horizontal axis represents the current I. A characteristic line CL3 indicated by a one-dot chain line is a characteristic of a rotating electrical machine using a conventional closed slot structure stator. A characteristic line CL4 indicated by a solid line is a characteristic of the rotating electrical machine 100 having the stator 30 using the stator core 10A (see FIGS. 1 and 2) shown in the first embodiment.

  Comparing the characteristic line CL4 and the characteristic line CL3, regardless of the magnitude of the current I, the torque reduction rate Rt of the characteristic line CL4 is lower than that of the characteristic line CL3. That is, the stator 30 can improve performance as compared with the conventional closed slot structure stator.

  FIG. 19 shows an example of a characteristic line CL5 in which the vertical axis is the torque reduction rate ratio Rtr and the horizontal axis is the current I. The torque reduction rate ratio Rtr is a value obtained by dividing the torque reduction rate Rta by the torque reduction rate Rtb. That is, Rtr = Rta / Rtb. The torque reduction rate Rta is the torque reduction rate Rt applied to the stator cores 10B to 10D (see FIGS. 6, 7, and 10 to 13) shown in the second to fourth embodiments. The torque reduction rate Rtb is the torque reduction rate Rt applied to the stator 30 that does not have the flux barrier 14 shown in the first embodiment.

  The torque reduction rate ratio Rtr shown as the characteristic line CL5 is lower than 1.0 in the low current region. That is, the performance of the rotating electrical machine 100 can be further improved by providing the flux barrier 14. Note that the low current region is a current region having a magnitude such that the magnetic flux φsr does not reach saturation. Specifically, it corresponds to a current region that is a fraction of the rated current of the rotating electrical machine 100 (for example, 1/5) or less.

  The relationship between the stator configuration and the natural frequency fc is, for example, a bar graph shown in FIG. The “open slot” is an open slot structure stator in which the rib Rb is not provided. The “closed slot” is a closed slot structure stator in which the rib Rb is formed with a curved surface so that the tip end surface 11 a of the tooth 11 is smooth. “10A” is the stator 30 having the stator core 10A. “10B to 10D” is the stator 30 having the stator cores 10B to 10D.

  The 0th natural frequency of the annular ring becomes the natural frequency fc21 in the open slot structure stator. On the other hand, the stator having the closed slot structure and the stator 30 having the stator cores 10A to 10D have the natural frequency fc22. As shown in the figure, there is almost no difference between the natural frequency fc21 and the natural frequency fc22.

  On the other hand, the annular eighth-order natural frequency becomes the natural frequency fc23 in the open slot structure stator. On the other hand, the stator having the closed slot structure and the stator 30 having the stator cores 10A to 10D have the natural frequency fc24. As shown in the figure, there is a large difference between the natural frequency fc23 and the natural frequency fc24 (fc24> fc23). Although not shown, the circular secondary natural frequency, the circular tertiary natural frequency,..., The circular ninth natural frequency are the same as those in FIGS. Therefore, the rotating electrical machine 100 having the stator 30 can suppress vibration and noise to the same extent as a conventional closed slot structure stator.

[Other Embodiments]
In the above, although the form for implementing this invention was demonstrated according to Embodiment 1-5, this invention is not limited to the said form at all. In other words, various forms can be implemented without departing from the scope of the present invention. For example, the following forms may be realized.

  In Embodiment 2-4 mentioned above, it was set as the structure which applies plate-shaped rib Rb1 as rib Rb which connects between the teeth 11 adjacent to the circumferential direction in the stator core 10 (FIG.1, FIG.6, FIG.6). 10, see FIG. It is good also as a structure which replaces with this form and applies rib Rb which consists of shapes other than rib Rb1. For example, the rib Rb2 of the stator iron core 10E shown in FIG. 21 has a plurality of (two in FIG. 21) plate shapes provided in parallel. The rib Rb3 of the stator iron core 10F shown in FIG. 22 has a plurality of plate shapes provided in parallel and a portion obtained by connecting plate shapes adjacent in the radial direction. The rib Rb4 of the stator core 10G shown in FIG. 23 has a plate shape having a non-linearly bent portion. Although illustration is omitted, as long as the adjacent teeth 11 can be connected to each other, they may be formed in a mesh shape or a curved surface shape. Regardless of the shape of the rib Rb, the leakage magnetic flux φe can be suppressed, so that the same effect as the second to fourth embodiments can be obtained.

  In Embodiment 2-4 mentioned above, it was set as the structure which provides the flux barrier 14 (14A-14C) in the teeth 11 (refer FIG. 6, FIG. 7, FIG. 10-FIG. 13). Instead of this configuration, the flux barrier 14 may be provided so as to straddle the teeth 11 and the ribs Rb. For example, the stator core 10H shown in FIG. 24 has a flux barrier 14D having the same shape as the flux barrier 14B (see FIGS. 10 and 11) of the stator core 10C shown in the third embodiment. The flux barrier 14D is provided so as to straddle the teeth 11 and the ribs Rb2. The circumferential width W2 in this configuration example is a width in a direction intersecting with the radial direction as illustrated. Instead of the flux barrier 14D, flux barriers 14A and 14C may be applied. Since only the position where the flux barrier 14 is provided is different, the same effect as the second to fourth embodiments can be obtained.

  In Embodiment 2-4 mentioned above, the flux barrier 14 (14A-14C) was comprised by the through-hole whose plane (or cross section) has a predetermined shape (refer FIG. 6, FIG. 7, FIG. 10-FIG. 13). Instead of this configuration, the flux barrier 14A (through hole) of the stator iron core 10I shown in FIG. Although illustration is omitted, the flux barriers 14B, 14C, and 14D may be similarly filled with the nonmagnetic member 15. The nonmagnetic member 15 corresponds to a nonmagnetic member such as a nonmagnetic metal (specifically, aluminum, copper, stainless steel, brass, etc.) or a nonmagnetic resin. Although not shown, the non-through hole (that is, the recess) may have a thickness in the axial direction that is smaller than half of the radial width W1. Regardless of the configuration, the leakage magnetic flux φt can be suppressed, and the same effects as those of the second to fourth embodiments can be obtained. When filled with the nonmagnetic member 15, it is possible to ensure the same degree of rigidity as the teeth 11 (see FIGS. 1 and 2) without the flux barrier 14.

  The flux barrier 14A of the second embodiment described above is configured by a through-hole having a square plane (or cross section) (see FIGS. 6 and 7), and the flux barrier 14B of the third embodiment has a plane (or cross section). The flux barrier 14C according to the fourth embodiment is configured with a through-hole having a circular arc shape (see FIGS. 12 and 13). . Instead of these forms, a polygonal through hole having a pentagonal shape or more may be used, or a circular shape other than an arc shape (for example, a circle or a fan shape including a semicircle) may be used. And a combined shape obtained by combining a circular shape. Since only the shape of the flux barrier 14 is different, the same effect as the second to fourth embodiments can be obtained.

  In Embodiment 2-4 mentioned above, it was set as the structure which provides the one flux barrier 14 (14A-14C) in the boundary part of rib Rb and the teeth 11 (refer FIG. 6, FIG. 7, FIG. 10-FIG. 13). Instead of this form, two or more flux barriers 14 may be provided at the boundary between the rib Rb and the tooth 11. The two or more flux barriers 14 may be formed in the same shape or different shapes. Since only the number of flux barriers 14 provided at the boundary between the rib Rb and the tooth 11 is different, the same effect as in the second to fourth embodiments can be obtained.

  In the first to fifth embodiments described above, the configuration is applied to the inner rotor type rotating electrical machine 100 (see FIGS. 1, 2, 6, 7, and 10 to 17). Instead of this form, a configuration applied to the outer rotor type rotating electrical machine 100 may be adopted. In this configuration, the rib Rb is provided by being separated from the tip surface 11a of the tooth 11 disposed on the outer diameter side by a predetermined distance t on the yoke 13 side (that is, on the inner diameter side). Since only the arrangement of the rotor 40 and the stator 30 is different, the same effect as the first to fifth embodiments can be obtained.

  In the first to fifth embodiments described above, the rotor 40 is formed of a soft magnetic material having no magnet (see FIG. 17). It may replace with this form and may be the composition which has a magnet. Since only the presence or absence of the magnet is different, the same effect as the first to fifth embodiments can be obtained.

  In the above-described first to fifth embodiments, 24 is applied as the number of poles m of the stator core 10 and 3 is applied as the number of phases p of the stator winding 20. Instead of this form, the number of poles m may be a number other than 24, and the number of phases p may be a number other than 3. Since only the number of poles m and the number of phases p are different, the same effects as those of the first to fifth embodiments can be obtained.

[Function and effect]
According to the first to fifth embodiments and other embodiments described above, the following effects can be obtained.

  (1) A stator iron core 10 (10A to 10I) including a yoke 13, a plurality of teeth 11 extending in the radial direction from the yoke 13, and a plurality of slots 12 formed between the teeth 11 adjacent in the circumferential direction. In the stator 30 having the stator winding 20 that is housed and wound in the slot 12, it is provided at a predetermined distance t from the tip of the tooth 11 toward the yoke 13, and between the adjacent teeth 11 in the circumferential direction. The ribs Rb (Rb1 to Rb4) are connected to each other (see FIGS. 1, 2, 6, 6, 7, 10 to 13, and 21 to 25). According to this configuration, since the rib Rb is provided at a predetermined distance t from the tip of the tooth 11 toward the yoke 13, the leakage flux φe leaking from the rotor 40 to the rib Rb is suppressed to a negligible level. Therefore, saliency can be maintained. Further, by connecting the teeth 11 adjacent to each other in the circumferential direction with the ribs Rb, rigidity comparable to that of the conventional closed slot structure stator is maintained, and vibration and noise can be suppressed.

  (2) The stator core 10 is configured to have a flux barrier 14 (14A to 14D) that inhibits the leakage flux φt flowing between the stator core 10 and the rib Rb (FIGS. 6, 7, 10 to 13, and 21 to 21). (See FIG. 25). According to this configuration, the flux barrier 14 inhibits the leakage flux φt flowing between the tooth 11 and the rib Rb, so the leakage flux φt flowing from the flux φsr flowing between the stator 30 and the rotor 40 to the rib Rb is reduced. Can be suppressed.

  (3) The flux barrier 14 is configured to be formed by a hole having a polygonal shape (flux barriers 14A, 14B, 14D) including a polygon greater than or equal to a triangle, or a circular shape (flux barrier 14C) including a circular shape or a sector shape. (See FIG. 6, FIG. 7, FIG. 10 to FIG. 13, FIG. 21 to FIG. 25). Although not shown, it may be formed by a hole made of a composite shape obtained by combining a polygonal shape and a circular shape, or may be formed by other shapes (that is, arbitrary formation) other than these. That is, a hole formed of one or more shapes among a polygonal shape, a circular shape, a composite shape, and other shapes may be formed. Regardless of the shape, the leakage magnetic flux φt leaking to the rib Rb and flowing through the rib Rb can be suppressed by providing a predetermined distance t from the tip of the tooth 11 to the yoke 13 side.

  (4) A hole (through hole or non-through hole) provided as the flux barrier 14 is filled with the nonmagnetic member 15 (see FIG. 25). According to this configuration, since the hole is filled with the nonmagnetic member 15, it is possible to suppress a decrease in rigidity due to the hole.

  (5) The circumferential width W2 between the end face of the tooth 11 and the end face of the flux barrier 14 is formed to be smaller than half of the radial width W1 of the rib Rb (FIGS. 7, 11, and 13). , See FIG. According to this configuration, the circumferential width W2 between the end face of the tooth 11 and the end face of the flux barrier 14 is smaller than the radial width W1 of the rib Rb. The magnetic saturation is more likely to occur between the end face of the tooth 11 and the end face of the flux barrier 14 than the rib Rb, so that the leakage flux φt flowing from the magnetic flux φsr flowing between the stator 30 and the rotor 40 to the rib Rb is more increased. It can be surely suppressed.

  (6) The circumferential width W4, which is the distance between both end faces in the circumferential direction of the flux barrier 14, is the circumference, which is the distance between the circumferential center of the teeth 11 and one end face of the flux barrier 14A (ie, the end face on the slot 12 side). The width ratio Q (= W4 / W3), which is the ratio divided by the direction width W3, is set to be equal to or less than a predetermined ratio (width ratio Q11 or width ratio Q12) (see FIGS. 8 and 9). . According to this configuration, the magnetic flux φsr flowing between the stator 30 (particularly the stator core 10) and the rotor 40 can suppress a decrease in the amount of magnetic flux due to the flux barrier 14. Therefore, it can suppress that the performance of the rotary electric machine 100 by the flux barrier 14 falls.

  (7) It was set as the structure comprised by laminating | stacking the some electromagnetic steel plate 10a (refer FIG. 14, FIG. 16). According to this configuration, since the electromagnetic steel plates 10a formed in a predetermined shape may be laminated, the stator core 10 can be formed (manufactured) by a simple process.

  (8) The rib Rb is configured to be connected so as to be orthogonal to the radial direction surfaces SF1 and SF2 of the teeth 11 (see FIGS. 2 and 7). According to this configuration, when the stator winding 20 (that is, the segment conductor 21) whose cross section is formed in a square shape is accommodated, the space factor can be increased. Further, the mechanical rigidity can be improved, the natural frequency can be increased, and the performance degradation can be more reliably suppressed.

  (9) The rotating electrical machine 100 is configured to include the stator 30 including the stator core 10 (10A to 10I) and the rotor 40 that is rotatably supported (see FIG. 17). According to this configuration, the rotating electrical machine 100 that maintains the saliency or maintains the rigidity of the entire stator 30 can be applied.

  (10) The rotor 40 is made of a soft magnetic material having no magnet (see FIG. 17). According to this configuration, the SR motor having the rotor 40 made of a soft magnetic material can further improve the performance due to the reluctance torque.

10 (10A to 10I) Stator core 11 Teeth 12 Slot 13 Yoke 20 Stator winding 30 Stator (stator)
40 Rotor
φe, φt Leakage magnetic flux Lr Predetermined distance Rb (Rb1-Rb4) Rib

Claims (12)

A stator core (10) having a yoke (13), a plurality of teeth (11) extending radially from the yoke, and a plurality of slots (12) formed between the teeth adjacent in the circumferential direction. When,
A stator winding (20) housed in the slot and wound ;
In a stator (30) comprising:
The stator iron core is
A rib (Rb) that is provided at a predetermined distance (t) from the tip of the tooth to the yoke side and connects the teeth adjacent in the circumferential direction ;
A flux barrier (14) that inhibits magnetic flux flowing between the ribs;
I have a,
The stator is characterized in that a circumferential width (W2) between an end face of the teeth and an end face of the flux barrier is formed smaller than a radial width (W1) of the rib . The circumferential width between the end face and the end face of the flux barrier of the teeth (W2) is as claimed in claim 1, characterized in that it is smaller than half of the rib in the radial direction width (W1) Stator.   3. The stator according to claim 1, wherein a radial width of the rib is set to a value in which vibration and noise caused by energization of the stator winding are absent or negligible. Dividing the distance between the circumferential end of the circumferential width of the flux barrier to (W4), with the teeth of the circumferential center between the distance a is the circumferential width of the slot side end portion of the flux barrier (W3) the width ratio is a ratio (Q) is a predetermined ratio (Q11, Q12) a stator according to any one of claims 1 to 3, characterized in that it is set to become less. A stator core (10) having a yoke (13), a plurality of teeth (11) extending radially from the yoke, and a plurality of slots (12) formed between the teeth adjacent in the circumferential direction. When,
A stator winding (20) housed in the slot and wound ;
In a stator (30) comprising:
The stator iron core is
A rib (Rb) that is provided at a predetermined distance (t) from the tip of the tooth to the yoke side and connects the teeth adjacent in the circumferential direction ;
A flux barrier (14) that inhibits magnetic flux flowing between the ribs;
I have a,
The circumferential width (W4), which is the distance between the circumferential ends of the flux barrier, is divided by the circumferential width (W3), which is the distance between the circumferential center of the teeth and the slot-side end of the flux barrier. The width ratio (Q) that is the ratio is set to be equal to or less than a predetermined ratio (Q11, Q12) . The stator according to claim 4, wherein the predetermined ratio is a ratio at which a torque reduction rate is a predetermined value or less. The flux barrier, multi-angular shape (14A, 14B, 14D), a circular arc shape (14C), a circular shape, or a fan shape, or the polygonal shape and the circular shape or the fan shape and the synthesized synthesis shape Ranaru The stator according to claim 1 , wherein the stator is formed by a through hole penetrating in an axial direction . The stator according to claim 7 , wherein the through hole is filled with a nonmagnetic member. The stator according to any one of claims 1 to 8 , wherein the stator is configured by laminating a plurality of electromagnetic steel plates (10a). The stator according to any one of claims 1 to 9 , wherein the rib is connected so as to be orthogonal to a radial direction surface (SF1, SF2) of the teeth. The stator according to any one of claims 1 to 10 ,
A rotating electrical machine (100) having a rotor (40) rotatably supported. The rotating electrical machine according to claim 11 , wherein the rotor is made of a soft magnetic material having no magnet.

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