JP6305276B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electric machine such as an electric motor or a generator, and more particularly to a structure of a stator core that reduces cogging torque.

  In a conventional rotating electrical machine, a plurality of teeth protrude in the radial direction from a position that equally divides the circumferential surface of the cylindrical body, and a tooth tip protrusion protrudes laterally from the tip of each tooth. The electric wire was wound around the electric wire winding part between the part and the cylindrical body (see, for example, Patent Document 1). In a conventional rotating electrical machine, an annular stator core is divided into a plurality of core pieces in the circumferential direction for each tooth, and each core piece is divided into a plurality of core blocks in the axial direction, and teeth between adjacent core blocks are separated. The wire winding portions are arranged in the axial direction of the stator core to facilitate the winding operation. Further, the cogging torque is reduced by forming a step skew by changing the amount of protrusion of the tooth tip protrusion from the side surface of the wire winding portion between adjacent core blocks.

Japanese Patent Laid-Open No. 2007-60800

In the conventional rotating electric machine, the protrusion amount L1 of the teeth tip protrusion having a large protrusion amount is approximately twice as large as the protrusion amount L2 of the teeth tip protrusion having a small protrusion amount. Therefore, when assembling an annular stator core by assembling the core piece to the core piece that has been assembled in advance from the axial direction, the teeth tip protrusions of adjacent core pieces interfere with each other, and the core piece cannot be assembled from the axial direction. In this case, the core piece is assembled to the core piece assembled from the outside in the radial direction to assemble the annular stator core, which causes a problem that the assembly apparatus is increased in size.
Further, since the protrusion amounts L1 and L2 of the teeth tip protrusions are set so as to satisfy the relationship of L1≈2 × L2, the phase difference of the cogging torque in the core blocks arranged in the axial direction is an appropriate angle. However, there was a problem that the cogging torque could not be effectively reduced.

  The present invention has been made to solve the above-described problem, and provides a rotating electrical machine that enables assembly of split cores in the axial direction, can suppress an increase in the size of an assembly device, and can effectively reduce cogging torque. The purpose is to obtain.

Each of the rotating electrical machines according to the present invention is manufactured by laminating electromagnetic steel plates, and includes an arc-shaped core back portion and a split core having teeth protruding radially inward from an inner peripheral surface of the core back portion. A stator having a ring-shaped stator core configured by abutting the circumferential side surfaces of the portion and arranged in the circumferential direction, and a coil wound around the teeth, and coaxially via a gap inside the stator And a disposed rotor. The teeth protrude from the inner peripheral surface of the core back portion radially inward with a constant circumferential width and extend in the axial direction, and project from the tip of the electric wire winding portion to both sides in the circumferential direction. A pair of teeth tip protrusions, each of the pair of teeth tip protrusions having a maximum overhang portion with a maximum overhang amount and a minimum overhang portion with a minimum overhang amount. The minimum value of the circumferential angle between the teeth tip protrusions of the teeth adjacent to each other in the circumferential direction is φ, the wire winding in a plane perpendicular to the axis of the rotor and passing through the maximum projecting portion An intersection line A1 of an extension line of the side surface of the maximum projecting portion side and an inner peripheral surface of the tip end portion of the tooth, a first radial line passing through a circumferential end portion of the maximum projecting portion, and an inner peripheral surface of the tip end portion of the tooth The angle in the circumferential direction with respect to the intersection B1 is θ1, and the extension line of the side surface of the minimum overhanging portion of the wire winding portion on the plane perpendicular to the axis of the rotor and passing through the minimum overhanging portion and the above When the angle in the circumferential direction between the intersection A2 with the inner peripheral surface of the tooth tip and the intersection B2 between the second radial line passing through the circumferential end of the minimum projecting portion and the inner peripheral surface of the tooth is θ2. to, 2 × θ2 <θ1 <θ2 + φ And 3 × θ2 <θ1 <6 × θ2 is satisfied.

According to this invention, φ corresponds to the slot opening angle, θ1 corresponds to the circumferential angle of the maximum overhanging portion of the tooth tip protrusion, and θ2 corresponds to the circumferential angle of the minimum overhanging portion of the tooth tip protrusion. Since the maximum skew angle θ (= θ1−θ2) is smaller than the slot opening angle φ, the divided cores can be assembled from the axial direction without interference of the teeth tip protrusions when the stator core is assembled. . Therefore, it is not necessary to assemble the split core from the outside in the radial direction, and the assembly apparatus can be downsized.
Further, since θ1> 2 × θ2 is established, the phase difference of the cogging torque can be set to an appropriate angle by the step skew, and the cogging torque can be reduced.

It is sectional drawing which shows the rotary electric machine which concerns on Embodiment 1 of this invention. It is a perspective view which shows the division | segmentation core which comprises the stator core in the rotary electric machine which concerns on Embodiment 1 of this invention. It is principal part sectional drawing explaining the structure of the stator core in the rotary electric machine which concerns on Embodiment 1 of this invention. It is the top view which looked at the state which expand | deployed the stator core in the plane in the rotary electric machine which concerns on Embodiment 1 of this invention from radial inside. It is a perspective view explaining the assembly method of the stator core in the rotary electric machine which concerns on Embodiment 1 of this invention. It is a figure which shows the relationship between the protrusion amount of the teeth front-end | tip protrusion, and cogging torque in the rotary electric machine which concerns on Embodiment 1 of this invention. It is a perspective view which shows the division | segmentation core in the rotary electric machine which concerns on Embodiment 2 of this invention. It is the top view which looked at the state which expand | deployed the stator core on the plane in the rotary electric machine which concerns on Embodiment 2 of this invention from radial direction inner side. It is a perspective view which shows the division | segmentation core in the rotary electric machine which concerns on Embodiment 3 of this invention. It is the top view which looked at the state which expand | deployed the stator core in the plane in the rotary electric machine which concerns on Embodiment 3 of this invention from radial direction inner side. It is a perspective view which shows the division | segmentation core in the rotary electric machine which concerns on Embodiment 4 of this invention. It is the top view which looked at the state which expand | deployed the stator core on the plane in the rotary electric machine which concerns on Embodiment 4 of this invention from radial direction inner side. It is a perspective view which shows the division | segmentation core in the rotary electric machine which concerns on Embodiment 5 of this invention. It is the top view which looked at the state which expand | deployed the stator core on the plane in the rotary electric machine which concerns on Embodiment 5 of this invention from radial direction inner side. It is a top view which shows the division | segmentation core in the rotary electric machine which concerns on Embodiment 6 of this invention. It is a top view which shows the division | segmentation core in the rotary electric machine which concerns on Embodiment 7 of this invention. It is a top view which shows the division | segmentation core in the rotary electric machine which concerns on Embodiment 8 of this invention. It is a top view which shows the division | segmentation core in the rotary electric machine which concerns on Embodiment 9 of this invention. It is the top view which looked at the state which expand | deployed on the plane the stator core in the rotary electric machine which concerns on Embodiment 10 of this invention from the radial inside. It is a perspective view which shows the rotor in the rotary electric machine which concerns on Embodiment 11 of this invention. It is the top view which looked at the state which expand | deployed on the plane the rotor core in the rotary electric machine which concerns on Embodiment 11 of this invention from the radial direction outer side. It is the top view which looked at the state which expand | deployed the stator core in the rotary electric machine which concerns on Embodiment 11 of this invention on the plane from the radial inside. It is a figure which shows the result of having measured the torque ripple when rotating the rotary electric machine which concerns on Embodiment 11 of this invention forward and backward. It is the top view which looked at the state which expand | deployed on the plane the rotor core in the rotary electric machine which concerns on Embodiment 12 of this invention from the radial direction outer side. It is the top view which looked at the state which expand | deployed the stator core in the rotary electric machine which concerns on Embodiment 12 of this invention on the plane from the radial inside. It is a perspective view which shows the rotor in the rotary electric machine which concerns on Embodiment 13 of this invention. It is a schematic diagram explaining the magnetic flux leakage of the stator core in the rotary electric machine which concerns on Embodiment 13 of this invention. It is a figure which shows the relationship between the inductance and slot opening width in the rotary electric machine which concerns on Embodiment 13 of this invention.

  Hereinafter, preferred embodiments of a rotating electrical machine according to the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
1 is a sectional view showing a rotating electrical machine according to Embodiment 1 of the present invention, FIG. 2 is a perspective view showing a split core constituting a stator core in the rotating electrical machine according to Embodiment 1 of the present invention, and FIG. FIG. 4 is a cross-sectional view of a main part illustrating the configuration of the stator core in the rotating electrical machine according to the first embodiment of the present invention, and FIG. 4 illustrates a state in which the stator core in the rotating electrical machine according to the first embodiment of the present invention is unfolded on the plane from the radially inner side. FIG. 5 is a perspective view for explaining a method of assembling a stator core in the rotating electrical machine according to the first embodiment of the present invention, and FIG. 6 is a perspective view of the tooth tip protrusion in the rotating electrical machine according to the first embodiment of the present invention. It is a figure which shows the relationship between overhang | projection amount and cogging torque.

  In FIG. 1, a rotating electrical machine 100 includes an annular stator 1 and a rotor 50 that is coaxially and rotatably disposed inside the stator 1 via a gap.

  The stator 1 includes a stator core 2 configured in an annular shape by arranging twelve divided cores 3 in the circumferential direction, and a stator coil 10 attached to the stator core 2.

As shown in FIG. 2, the split core 3 includes an arc-shaped core back portion 4 and teeth 5 protruding radially inward from the inner peripheral surface of the core back portion 4. A substantially T-shaped core piece punched from is laminated and integrated. The first and second tooth tip protrusions 6a ₁ and 6b ₁ protrude from the tip of the tooth 5 to both sides in the circumferential direction. The inner peripheral surface of the tip portion of the tooth 5 including the first and second tooth tip protrusions 6a ₁ , 6b ₁ is a part of a cylindrical surface centering on the axis of the shaft 51, that is, an arc surface. Surface facing the first and second teeth top projection _6a 1, the core back portion 4 side 6b _1, the core back portion toward the tip of the first and second teeth top projection _6a 1, 6b ₁ of the projecting direction Inclined away from 4. End surfaces of the first and second teeth tip protrusions 6 a ₁ , 6 b ₁ that face in the circumferential direction are flat surfaces in contact with a plane including the axis of the shaft 51. Between the first and second tooth tip protrusions 6a ₁ , 6b ₁ and the core back part 4 is an electric wire winding part 7. The electric wire winding part 7 protrudes radially inward with a constant circumferential width from the circumferential center position of the inner circumferential surface of the core back part 4.

Here, the divided core 3 is divided into two equal parts in the axial direction into the first core block 8 and the second core block 9. The circumferential width of the inner peripheral surface of the tip of the tooth 5 including the first and second tooth tip protrusions 6a ₁ and 6b ₁ is constant with respect to the axial direction. Then, in the first core block 8, the amount of projection of the first tooth tip protrusion 6a ₁ is larger than the second amount of projection of the tooth tip protrusion 6b _1. In the second core block 9, the amount of projection of the second tooth tip protrusion 6b ₁ is larger than the first amount of projection of the tooth tip protrusion 6a _1. Thus, the first core block 8, the second core block 9, the first and second protruding amount of the tooth tip protrusion 6a _1, 6b ₁ has reversed in the circumferential direction. Therefore, in the split core 3, a step skew is formed between the first core block 8 and the second core block 9.

Note that the second tooth tip protrusion 6b ₁ of the first tooth tip protrusion 6a ₁ and the second core block 9 of the first core block 8 becomes maximum overhang, a same amount of projection. Further, a first tooth tip protrusion 6a ₁ of the second tooth tip protrusion 6b ₁ and the second core block 9 of the first core block 8 is minimized overhang, a same amount of projection. Further, an intermediate core block in which a protruding portion equal to the minimum protruding amount in the first and second core blocks 8 and 9 protrudes on both sides in the circumferential direction may be disposed between the first and second core blocks 8 and 9. Good.

  The stator core 2 is formed in an annular shape by aligning and integrating the twelve divided cores 3 in the circumferential direction with the teeth 5 facing inward in the radial direction, but the side surfaces in the circumferential direction of the core back portion 4 are butted together. ing. In the stator core 2 configured as described above, the core back portions 4 are arranged in the circumferential direction to form an annular core back, and twelve teeth 5 are arranged at an equiangular pitch in the circumferential direction. And the stator coil 10 is comprised by the concentrated winding coil 10a produced by winding an electric wire around the electric wire winding part 7 of each division | segmentation core 3. As shown in FIG.

The rotor 50 includes a rotor core 52 fixed to a shaft 51 inserted through an axial center position, and a permanent magnet 53 fixed to the outer peripheral surface of the rotor core 52 and arranged at an equiangular pitch in the circumferential direction, and constituting a magnetic pole. It is the surface magnet type rotor provided.
The rotating electrical machine 100 configured as described above operates as an 8-pole 12-slot inner rotor type electric motor or a generator.

  Next, the configuration of the stator core 2 will be described with reference to FIGS. 3 and 4.

First, the minimum value of the circumferential angle between the opposing teeth tip protrusions of the divided cores 3 adjacent in the circumferential direction is defined as a slot opening angle φ. Here, in a plane orthogonal to the axis of the shaft 51 (not shown), a second circumferential end portion of the tooth tip protrusion 6b ₁ of the divided cores 3, i.e. the axis of the extending direction of the distal end portion and the shaft 51 and a connecting line (radial line), the circumferential angle between the line connecting the axis of the first tooth tip protrusion 6a ₁ of the projecting direction of the distal end portion and the shaft 51 of the adjacent split cores 3, The slot opening angle φ. In a plane orthogonal to the axis of the shaft 51, the intersection of the extension line and the distal end portion inner peripheral surface of the teeth 5 in the circumferential direction of the side of the first tooth tip protrusion 6a ₁ side of the wire winding portion 7 A1, wire the intersection of the second tooth tip protrusion 6b ₁ side in the circumferential direction tip inner circumferential face of the extension line of the side edges and the teeth 5 of the winding portion 7 and A2. A line passing through the inner peripheral surface of the tip of the tooth 5, the tip of the first tooth tip protrusion 6 a ₁ in the first core block 8 in the protruding direction, and the shaft center of the shaft 51 in a plane orthogonal to the axis of the shaft 51. the intersection of the minute B1, the intersection of a distal end inner peripheral surface of the tooth 5, the line segment passing through the axial center of the second tooth tip protrusion 6b ₁ of the projecting direction of the distal end portion and the shaft 51 in the first core block 8 Is B2. A line segment connecting the circumferential center position of the slot surrounded by the core back portion 4 and the teeth 5 of the adjacent split core 3 and the axis of the shaft 51 is the slot center line 11. Hereinafter, a line segment connecting each part of the stator core 2 and the shaft center of the shaft 51 is referred to as a radial line.

In the plane orthogonal to the axis of the shaft 51, the circumferential angle between the radial line passing through A1 and the radial line passing through B1 is θ1. Similarly, let θ2 be the circumferential angle between the radial line passing through A2 and the radial line passing through B2. Incidentally, .theta.1 corresponds to the first tooth tip overhang angle of the projecting portion 6a ₁ of the first core block 8 (maximum overhang amount), .theta.2 is flared angle of the second tooth tip protrusions 6b ₁ of the first core block 8 ( This corresponds to the minimum overhang amount). Further, .theta.1 corresponds to the second tooth tip overhang angle of the projecting portion 6b ₁ of the second core block 9 (maximum overhang amount), .theta.2 is flared angles of the first tooth tip protrusion 6a ₁ of the second core block 9 ( This corresponds to the minimum overhang amount). That, .theta.1 corresponds to the first and second maximum overhang amount of the tooth tip protrusion _6a 1, 6b _1, .theta.2 is equivalent to the first and second minimum amount of projection of the tooth tip protrusion _6a 1, 6b ₁ To do.
In the first embodiment, the stator core 2 is manufactured so as to satisfy 2 × θ2 <θ1 <θ2 + φ.

  According to the first embodiment, the stator core 2 is divided into 12 substantially T-shaped divided cores 3 including the core back portion 4 and the teeth 5, and the wire winding portion 7 of the divided core 3 is skewed. Absent. Thus, automation of the winding operation of the concentrated winding coil 10a is facilitated.

  Here, a method of assembling the stator 1 will be described with reference to FIG. In FIG. 5, the concentrated winding coil 10a wound around the wire winding portion 7 is omitted. A positioning hole 23 is formed so as to penetrate the core back portion 4 at a position radially outward of the teeth 5 of the core back portion 4 of the split core 3.

  Twelve positioning pins 25 are erected at an equiangular pitch on the same circumference on an assembly jig (not shown). Then, the first divided core 3 around which the concentrated winding coil (not shown) is wound is gripped and aligned so that the positioning hole 23 is coaxial with the first pin 25. It is moved in the length direction, that is, in the axial direction. As a result, the first pin 25 is inserted into the positioning hole 23, and the first divided core 3 is positioned and set on the assembly jig. Next, the second split core 3 is gripped, aligned so that the positioning hole 23 is coaxial with the second pin 25, and moved in the axial direction. As a result, the second pin 25 is inserted into the positioning hole 23, and the second split core 3 is positioned and set on the assembly jig.

At this time, θ1 and θ2 satisfy θ1 <θ2 + φ. That is, the maximum skew angle θ (= θ1−θ2) that is the circumferential shift angle of the first and second tooth tip protrusions 6a ₁ and 6b ₁ in the split core 3 is smaller than the slot opening angle φ. A gap is formed between the Thus, when the butt side surfaces of the core back portion 4 of the split core 3 adjacent a first tooth tip protrusion 6a ₁ adjacent to the second tooth tip protrusion 6b ₁ . Therefore, the second split core 3 is configured so that the second tooth tip protrusion 6b ₁ is not interfered with the first teeth tip protrusion 6a ₁ of the first split core 3, and one of the circumferential directions of the core back portion 4 is prevented. The side surface can be moved in the axial direction while sliding on the other side surface in the circumferential direction of the core back portion 4 of the first divided core 3 set in advance. The second split core 3 is set on the assembly jig with the side surface of the core back portion 4 in contact with the side surface of the core back of the first split core 3.

  The third, fourth,..., 12th divided cores 3 are sequentially set in the assembly jig in the same manner, and the 12 divided cores 3 are arranged in an annular shape. Next, twelve divided cores 3 arranged in an annular shape are housed and fixed in a cylindrical frame, for example, by shrink fitting, and the stator 1 is assembled.

Thus, according to the first embodiment, θ1 and θ2 satisfy θ1 <θ2 + φ, and the circumferential shift angles of the first and second teeth tip protrusions 6a ₁ and 6b ₁ in the split core 3 The maximum skew angle θ (= θ1−θ2) is smaller than the slot opening angle φ. Therefore, when the butting side faces of the core back portion 4 of the split core 3 adjacent the gap between the first tooth tip protrusion 6a ₁ adjacent to the second tooth tip protrusion 6b ₁ is formed. Therefore, as shown in FIG. 5, one side surface in the circumferential direction of the core back portion 4 of the split core 3 is the other in the circumferential direction of the core back portion 4 of the split core 3 set in the assembly jig first. The split core 3 can be moved in the axial direction so as to slide on the side surface. As described above, the split core 3 can be assembled to the split core 3 disposed earlier from the axial direction without interference between the first and second tooth tip protrusions 6a ₁ and 6b _1. There is no need to assemble 3 to the split cores 3 arranged from the outside in the radial direction, and the assembly apparatus can be downsized.

  Further, since the maximum skew angle θ is smaller than the slot opening angle φ, the leakage magnetic flux between adjacent teeth 5 that does not contribute to torque output is reduced, and a large torque can be output. Therefore, the current value necessary for outputting the same torque is reduced, and the effect of reducing the temperature of the rotating electrical machine 100 is expected.

Next, in the rotating electrical machine 100, the result of measuring the cogging torque while changing the amount of protrusion of the first and second tooth tip protrusions 6a ₁ and 6b ₁ is shown in FIG. In FIG. 6, the horizontal axis represents θ1 / θ2 and the vertical axis represents a cogging torque value (cogging torque ratio) normalized by the cogging torque in a rotating electrical machine that satisfies θ = θ2.

From FIG. 6, it was found that when θ1 / θ2 is larger than 1, the cogging torque is reduced. Therefore, in the first and second core blocks 8 and 9, the overhang amount of the first and second teeth tip protrusions 6a ₁ and 6b ₁ is reversed to provide a skew in the circumferential direction, so that the cogging torque is obtained. It was confirmed that can be reduced.

Further, the amount of overhang of the first and second tooth tip protrusions 6a ₁ and 6b ₁ is set so as to satisfy 2 × θ2 <θ1, so that the cogging torque of the first and second core blocks 8 and 9 is reduced. Since the phase difference can be set to an appropriate angle, the cogging torque can be reduced as compared with Patent Document 1 that satisfies θ1≈2 × θ2. In particular, if the amount of protrusion of the first and second tooth tip protrusions 6a ₁ and 6b ₁ is set so as to satisfy 3 × θ2 <θ1 <6 × θ2, Patent Document 1 that satisfies θ1≈2 × θ2 is satisfied. On the other hand, it was confirmed that the cogging torque can be reduced by 40% or more. In the first embodiment, the cogging torque can be minimized by setting the angles of θ1, θ2, and φ to θ1 = 4.5 °, θ2 = 1 °, and φ = 5 °. That is, the optimum angles of θ1, θ2, and φ in the first embodiment are θ1 = 4.5 °, θ2 = 1 °, and φ = 5 °.

  Thus, from the viewpoint of effectively reducing the cogging torque, it is desirable to manufacture the stator core 2 so as to satisfy 3 × θ2 <θ1 <6 × θ2. In other embodiments, it goes without saying that it is desirable to produce the stator core so as to satisfy 3 × θ2 <θ1 <6 × θ2 from the viewpoint of effectively reducing the cogging torque. It is.

Embodiment 2. FIG.
FIG. 7 is a perspective view showing a split core in a rotary electric machine according to Embodiment 2 of the present invention, and FIG. 8 shows a state in which the stator core in the rotary electric machine according to Embodiment 2 of the present invention is developed on a plane inward in the radial direction. It is the top view seen from.

7 and 8, the divided core 3A is divided into three in the axial direction into a first core block 13, a second core block 14, and a third core block 15, and includes a core back portion 4 and a tooth 5A. Yes. First and second tooth tip protrusions 6a ₂ and 6b ₂ protrude from the tip of tooth 5A to both sides in the circumferential direction. The circumferential width of the inner peripheral surface of the tip end of the tooth 5A including the first and second tip protrusions 6a ₂ and 6b ₂ is constant. The first and second core blocks 13 and 15 are fabricated to the same shape, the amount of projection of the first tooth tip protrusion 6a ₂ is larger than the amount of projection of the second tooth tip protrusion 6b _2. In the second core block 14, the amount of projection of the second tooth tip protrusion 6b ₂ is larger than the amount of projection of the first tooth tip protrusion 6a _2. That is, the second tooth tip protrusion 6b ₂ of the first tooth tip protrusion 6a ₂ and the second core block 14 of the first and third core block 13, 15, the maximum projecting portion of the maximum overhang amount (.theta.1) . The first tooth tip protrusion 6a ₂ of the second tooth tip protrusion 6b ₂ and the second core block 14 of the first and third core block 13, 15 is minimal overhang of the minimum projecting amount (.theta.2). Furthermore, the axial length of the second core block 14 is twice the axial length of the first core block 13. The slot opening angle φ is a circumferential angle between the first tooth tip protrusion 6a ₂ and the second tooth tip protrusion 6b ₂ facing each other in the circumferentially adjacent divided core 3A.

Thus, the first core block 13 in the second core block 14, the amount of projection of the first and second teeth top projection _6a 2, 6b ₂ has reversed in the circumferential direction. Therefore, the split core 3A is formed with a step skew of the maximum skew angle θ (= θ1-θ2). The stator core 2A is configured by abutting the circumferential side surfaces of the core back portion 4 and arranging the divided cores 3A in an annular shape. The stator core 2A is manufactured so as to satisfy 2 × θ2 <θ1 <θ2 + φ.

In the second embodiment, the stator core 2A is divided into divided cores 3A. The wire winding part 7 of the split core 3A is not skewed. A step skew is formed in the split core 3A, and the stator core 2A is fabricated so as to satisfy 2 × θ2 <θ1 <θ2 + φ. Therefore, the second embodiment also has the same effect as the first embodiment.
In the second embodiment, the first and third core blocks 13 and 15 are formed in the same shape, and the axial length of the second core block 14 is the axial length of the first and third core blocks 13 and 15. Twice as much. Therefore, the rotor facing surface that faces the rotor 50 of the stator core 2A, which is constituted by the inner peripheral surface of the tip of the tooth 5A, intersects the rotor facing surface with a plane that passes through the axial center position and is orthogonal to the axis of the shaft 51. On the other hand, it is line symmetric and no thrust force is generated.

Embodiment 3 FIG.
9 is a perspective view showing a split core in a rotary electric machine according to Embodiment 3 of the present invention, and FIG. 10 shows a state in which the stator core of the rotary electric machine according to Embodiment 3 of the present invention is developed on a plane inward in the radial direction. It is the top view seen from.

9 and 10, the divided core 3B is divided into three equal parts in the axial direction into the first core block 16, the second core block 17, and the third core block 18, and includes a core back portion 4 and a tooth 5B. ing. The first and second tooth tip protrusions 6a ₃ and 6b ₃ protrude from the tip of the tooth 5B to both sides in the circumferential direction. The circumferential width of the inner peripheral surface of the tip of the tooth 5B including the first and second tooth tip protrusions 6a ₃ and 6b ₃ is constant. The amount of protrusion of the first tooth tip protrusion 6a ₃ is reduced in a step-like order in the order of the first core block 16, the second core block 17, and the third core block 18. In other words, the amount of overhang of the second tooth tip protrusion 6b ₃ is increased stepwise in the order of the first core block 16, the second core block 17, and the third core block 18. Then, the first tooth tip protrusion 6a ₃ of the first core block 16 and the second tooth tip protrusion 3b ₃ of the third core block 18, the maximum projecting portion of the maximum overhang amount (.theta.1). Further, a second tooth tip protrusion 6b ₃ of the first core block 16 first tooth tip protrusion 3a ₃ of the third core block 18, the minimum projecting portion of the minimum projecting amount (.theta.2). Incidentally, the slot opening angle phi, is a circumferential angle between a first tooth tip protrusion 6a ₃ opposite the split cores 3B adjacent to each other in the circumferential direction and the second tooth tip protrusion 6b _3.

  As described above, in the split core 3B, a step skew of the maximum skew angle θ (= θ1−θ2) is formed between the first core block 16 and the third core block 18. Furthermore, step skew is formed between the first core block 16 and the second core block 17 and between the second core block 17 and the third core block 18. The stator core 2B is configured by abutting the side surfaces in the circumferential direction of the core back portion 4 and arranging the split cores 3B in an annular shape. The stator core 2B is manufactured so as to satisfy 2 × θ2 <θ1 <θ2 + φ.

In the third embodiment, the stator core 2B is divided into divided cores 3B. The wire winding part 7 of the split core 3B is not skewed. A step skew is formed in the split core 3B, and the stator core 2B is manufactured so as to satisfy 2 × θ2 <θ1 <θ2 + φ. Therefore, the third embodiment also has the same effect as the first embodiment.
In the third embodiment, since the three-stage skew is formed in the divided core 3B, the cogging torque component having a higher frequency than the two-stage skew can be reduced.

  In the third embodiment, the divided core is divided into three core blocks in the axial direction. However, the number of divided cores in the axial direction is not limited to three and may be four or more. In this case, the amount of overhang of the teeth tip protrusion can be adjusted, and the phase difference of cogging torque in each core block can be set for each core block, so by increasing the number of stages of stage skew, cogging torque components of multiple frequencies can be obtained. Can be reduced.

Embodiment 4 FIG.
FIG. 11 is a perspective view showing a split core in a rotary electric machine according to Embodiment 4 of the present invention, and FIG. 12 shows a state in which the stator core in the rotary electric machine according to Embodiment 4 of the present invention is developed on a plane inward in the radial direction. It is the top view seen from.

In FIG. 11 and FIG. 12, the divided core 3 </ b> C includes a core back portion 4 and a tooth 5 </ b> C. The first and second tooth tip protrusions 6a ₄ and 6b ₄ protrude from the tip of the tooth 5C to both sides in the circumferential direction. The circumferential width of the inner peripheral surface of the tip of the tooth 5C including the first and second tooth tip protrusions 6a ₄ and 6b ₄ is constant. Overhang amount of the first tooth tip protrusion 6a ₄ is toward the other end from the one axial end, each core pieces constituting the divided core 3C, is smaller at a constant gradient. Overhang of the second tooth tip protrusion 6b ₄ is toward the other end from the one axial end, each core pieces constituting the divided core 3C, is larger at a constant gradient.

Then, the amount of projection of the first tooth tip protrusion 6a ₄ in the axial direction one end of the split core 3C is equal to the amount of projection of the second tooth tip protrusions 3b ₄ in the other axial end of the split core 3C, the maximum overhang amount ( θ1). Further, the amount of projection of the second tooth tip protrusions 6b ₄ in the axial direction one end of the split core 3C is equal to the amount of projection of the first tooth tip protrusion 3a ₄ in the other axial end of the split core 3C, a minimum amount of projection ( θ2). That is, the other axial end portion of the axial end portion of the first tooth tip protrusion 6a ₄ and the second tooth tip protrusion 6b ₄ becomes maximum overhang, the other axial end portion of the first tooth tip protrusion 6a ₄ When one axial end of the second tooth tip protrusion 6b ₄ is minimum overhang. The slot opening angle φ is a circumferential angle between the first tooth tip protrusion 6a ₄ and the second tooth tip protrusion 6b ₄ facing each other in the circumferentially adjacent divided core 3C.

  Thus, the split core 3C is formed with a continuous skew. The stator core 2C is configured by abutting the side surfaces in the circumferential direction of the core back portion 4 and arranging the divided cores 3C in an annular shape. The stator core 2C is fabricated so as to satisfy 2 × θ2 <θ1 <θ2 + φ.

  In the fourth embodiment, the stator core 2C is divided into divided cores 3C. The wire winding part 7 of the split core 3C is not skewed. A continuous skew is formed in the split core 3C, and the stator core 2C is manufactured so as to satisfy 2 × θ2 <θ1 <θ2 + φ. Therefore, the fourth embodiment also has the same effect as the first embodiment.

  In the fourth embodiment, since the continuous skew is formed in the split core 3C, the phase difference of the cogging torque continuously changes in the axial direction due to the continuous skew, and more than in the third embodiment. The cogging torque component of the frequency can be reduced.

Embodiment 5. FIG.
FIG. 13 is a perspective view showing a split core in a rotary electric machine according to Embodiment 5 of the present invention, and FIG. 14 shows a state in which the stator core in the rotary electric machine according to Embodiment 5 of the present invention is developed on a plane inward in the radial direction. It is the top view seen from.

In FIG. 13 and FIG. 14, the divided core 3D includes a core back portion 4 and a tooth 5D. The first and second teeth tip protrusions 6a ₅ and 6b ₅ protrude from the tip of the tooth 5D to both sides in the circumferential direction. The circumferential width of the tip inner peripheral surface of the tooth 5D including the first and second tooth tip protrusions 6a ₅ and 6b ₅ is constant. The amount of protrusion of the first tooth tip protrusion 6a ₅ decreases from the axial end toward the center with a constant gradient for each core piece constituting the split core 3D, and is minimized at the axial center position. From the center toward the other end, each core piece constituting the split core 3D increases with a constant gradient. The amount of protrusion of the second teeth tip protrusion 6b ₅ increases from one axial end toward the center with a constant gradient for each core piece constituting the split core 3D, and is maximized at the axial center position. From the center toward the other end, each core piece constituting the split core 3D is reduced with a constant gradient.

The amount of protrusion of the first tooth tip protrusion 6a ₅ at both axial ends of the split core 3D is equal to the amount of protrusion of the second tooth tip protrusion 3b ₅ at the axial center of the split core 3D, and the maximum protrusion amount (θ1). ) Further, the protruding amount of the second tooth tip protrusion 6b ₅ at both axial ends of the split core 3D is equal to the protruding amount of the first tooth tip protrusion 3a ₅ at the axial center of the split core 3D, and the minimum protruding amount (θ2 ) That is, the axially central portion of the axial ends of the first teeth tip protrusion 6b ₅ and the second teeth top projection 6b ₅ becomes the maximum overhang, the axial center of the first tooth tip protrusion 6a ₅ and the Both end portions in the axial direction of the two teeth tip protrusions 6b ₅ are minimum projecting portions. The slot opening angle φ is a circumferential angle between the first tooth tip protrusion 6a ₅ and the second tooth tip protrusion 6b ₅ facing each other in the circumferentially adjacent divided core 3D.

  Thus, the split core 3D is formed with a continuous skew. The stator core 2D is configured by abutting the side surfaces in the circumferential direction of the core back portion 4 and arranging the divided cores 3D in an annular shape. The stator core 2D is manufactured so as to satisfy 2 × θ2 <θ1 <θ2 + φ.

  In the fifth embodiment, the stator core 2D is divided into divided cores 3D. The electric wire winding part 7 of the split core 3D is not skewed. A continuous skew is formed in the split core 3D, and the stator core 2C is manufactured so as to satisfy 2 × θ2 <θ1 <θ2 + φ. Therefore, the fifth embodiment also has the same effect as the first embodiment.

In the fifth embodiment, since the continuous skew is formed in the split core 3D, the phase difference of the cogging torque continuously changes in the axial direction due to the continuous skew, and more than in the fifth embodiment. The cogging torque component of the frequency can be reduced.
In the fifth embodiment, the rotor facing surface that faces the rotor 50 of the stator core 2D, which is constituted by the inner peripheral surface of the tip portion of the tooth 5D, passes through the axial center position and faces the rotor perpendicular to the axis of the shaft 51. The line is symmetrical with respect to the intersecting line with the surface, and no thrust force is generated.

Embodiment 6 FIG.
FIG. 15 is a plan view showing a split core in a rotary electric machine according to Embodiment 6 of the present invention.

In FIG. 15, the split core 3 </ b> E includes a core back portion 4 </ b> E and teeth 5. The fitting portion 19 is formed by protruding the outer diameter side of the side surface on the circumferential direction side of the core back portion 4E. And the to-be-fitted part 20 is formed in the concave shape in which the outer diameter side of the side surface of the circumferential direction other side of the core back part 4E can be recessed, and the fitting part 19 can be fitted.
Other configurations are the same as those in the first embodiment.

  In Embodiment 6, when the divided cores 3E are arranged in the circumferential direction to produce a stator core, the fitting portion 19 of one divided core 3E is fitted to the fitted portion 20 of the adjacent divided core 3E. , Radial displacement is prevented. Therefore, according to the sixth embodiment, the roundness of the inner diameter of the stator core is improved, and the cogging torque can be reduced.

  In addition, although the case where it applies to the split core 3 of the said Embodiment 1 is demonstrated in the said Embodiment 6, even if it applies to the split core of Embodiment 2-5, the same effect is acquired. .

Embodiment 7 FIG.
FIG. 16 is a plan view showing a split core in a rotary electric machine according to Embodiment 7 of the present invention.

In FIG. 16, the split core 3 </ b> F includes a core back portion 4 </ b> F and teeth 5. The fitting part 21 is formed by projecting the radial center part of the side surface on one side in the circumferential direction of the core back part 4F. And the to-be-fitted part 22 is formed in the concave shape into which the fitting part 21 can be fitted, denting the radial direction center part of the side surface of the circumferential direction other side of the core back part 4F.
Other configurations are the same as those in the first embodiment.

  In the seventh embodiment, when the divided cores 3F are arranged in the circumferential direction to produce the stator core, the fitting portion 21 of one divided core 3F is fitted to the fitted portion 22 of the adjacent divided core 3F. , Radial displacement is prevented. Therefore, according to the seventh embodiment, the roundness of the inner diameter of the stator core is improved, and the cogging torque can be reduced.

  In addition, in the said Embodiment 7, although the case where it applies to the split core 3 of the said Embodiment 1 is demonstrated, even if it applies to the split core of Embodiment 2-5, the same effect is acquired. .

Embodiment 8 FIG.
FIG. 17 is a plan view showing a split core in a rotary electric machine according to Embodiment 8 of the present invention.

In FIG. 17, the divided core 3 </ b> G includes a core back portion 4 </ b> G and teeth 5. A positioning hole 23 is formed at a radially outward position of the tooth 5 of the core back portion 4G.
Other configurations are the same as those in the first embodiment.

  In the eighth embodiment, as shown in FIG. 5, when the split core 3G is set in the stator core assembly jig from the axial direction, the pins 25 erected on the assembly jig are inserted into the positioning holes 23. Is done. Therefore, the split core 3G is positioned and set in the assembly jig with respect to the radial direction and the circumferential direction. Therefore, according to the eighth embodiment, positioning of the split core 3G is facilitated, and the assemblability of the stator core can be improved.

  In addition, in the said Embodiment 8, although the case where it applies to the split core 3 of the said Embodiment 1 is demonstrated, even if it applies to the split core of Embodiment 2-5, the same effect is acquired. .

Embodiment 9 FIG.
FIG. 18 is a plan view showing a split core in a rotary electric machine according to Embodiment 9 of the present invention.

In FIG. 18, the divided core 3 </ b> H includes a core back portion 4 </ b> H and teeth 5. The escape groove 24 is formed in the core back portion 4H so as to communicate the positioning hole 23 and the radially outer side of the core back portion 4H.
Other configurations are the same as those in the eighth embodiment.

  In the ninth embodiment, the escape groove 24 is formed in the core back portion 3H so as to communicate the positioning hole 23 and the radially outer side of the core back portion 4H. When the assembly jig is set, the fitting tolerance between the positioning hole 23 and the pin 25 can be reduced. Therefore, according to the ninth embodiment, the fitting between the positioning hole 23 and the pin 25 is improved, and the assembly accuracy of the stator core can be improved. Furthermore, since the split core 3H can be fixed using the escape groove 24 when the electric wire is wound around the electric wire winding part 7, the assemblability of the stator core can be improved.

  In addition, although the case where it applies to the split core 3 of the said Embodiment 1 is demonstrated in the said Embodiment 9, even if it applies to the split core of Embodiment 2-5, the same effect is acquired. .

Embodiment 10 FIG.
FIG. 19 is a plan view of a state in which a stator core in a rotary electric machine according to Embodiment 10 of the present invention is developed on a plane as viewed from the inside in the radial direction.

  In the tenth embodiment, the torque ripple reduction effect in the stator according to the second embodiment will be described with reference to FIG. A rotor facing surface, which is constituted by the inner peripheral surface of the tip portion of the tooth 5A and faces the rotor 50 of the stator core 2A, passes through the axial center position and is perpendicular to the axis of the shaft 51 (center surface 26), and the rotor facing surface. The line is symmetrical with respect to the intersection line. Here, the case where the magnetic pole center 27 of the rotor 50 advances to the left side in FIG.

  When the rotor 50 rotates in the forward direction, the magnetic saturation in the region α first increases. However, when the rotor 50 rotates in the reverse direction, the magnetic saturation in the region β increases. Then, the magnetic saturation near the point C when rotating forward is smaller than the magnetic saturation near the point D when rotating backward due to the influence of magnetic flux leakage at the shaft end. Therefore, a difference in torque ripple occurs between the forward rotation and the reverse rotation due to the difference in magnetic saturation between the points C and D.

In the tenth embodiment, since the slot opening angle φ is larger than the maximum skew angle θ, the magnetic saturation of the first and second tooth tip protrusions 6a ₂ and 6b ₂ is relaxed, and forward rotation and reverse rotation The difference in torque ripple is reduced.
In the tenth embodiment, the rotor facing surface of the stator core is axisymmetric with respect to the intersecting line between the center surface 26 and the rotor facing surface, so that no thrust force is generated.

  Although the tenth embodiment has been described using the stator according to the second embodiment, the same effect can be obtained even when the stator according to the first, third, and ninth embodiments is used.

Embodiment 11 FIG.
FIG. 20 is a perspective view showing a rotor in a rotary electric machine according to Embodiment 11 of the present invention, and FIG. 21 shows a state in which the rotor core in the rotary electric machine according to Embodiment 11 of the present invention is developed on a plane from the outside in the radial direction. FIG. 22 is a plan view of the rotating electric machine according to Embodiment 11 of the present invention. FIG. 22 is a plan view of the stator core deployed on a plane as viewed from the radial direction.

20 and 21, the rotor core 52 </ b> A is divided into two equal parts in the axial direction into a first rotor core 54 and a second rotor core 55. Eight permanent magnets 53 are arranged at equiangular pitches on the outer peripheral surfaces of the first and second rotor cores 54 and 55. The first rotor core 54 and the second rotor core 55 are arranged coaxially in the axial direction and fixed to the shaft 51 so that the circumferential positions of the permanent magnets 53 are shifted from each other. The rotor 50A configured as described above has a step skew, and a plane (center plane 28) passing through the axial center position and orthogonal to the axis of the shaft 51 serves as a step skew switching portion.
Other configurations are the same as those in the second embodiment.

In FIG. 22, the case where the magnetic pole center 27 of the rotor 50A advances to the left is defined as forward rotation, and the case where it proceeds to the right is defined as reverse rotation. The step skew switching portion of the rotor 50 </ b> A is located on the central surface 28.
When the rotor 50A rotates in the forward direction, the magnetic saturation increases in the order of the region γ and the region δ. However, when the rotor 50A rotates in the reverse direction, the magnetic saturation increases in the order of the region ε and the region ζ . The point G facing the step skew switching portion of the rotor 50A is likely to be magnetically saturated due to the influence of the leakage flux in the axial direction of the rotor 50A. For this reason, the magnetic saturation in the vicinity of the point G when the rotation is forward becomes larger than the magnetic saturation near the point G or the point F when the rotation is reversed.

Thus, due to the step skew formed in the rotor 50A in order to reduce the cogging torque, the magnetic saturation of the first and second tooth tip protrusions 6a ₂ and 6b ₂ changes in the axial direction, and forward rotation and reverse rotation Thus, the difference in torque ripple increases. In the eleventh embodiment, since the slot opening angle φ is larger than the maximum skew angle θ, the magnetic saturation of the first and second teeth tip protrusions 6a ₂ and 6b ₂ is alleviated, and forward rotation and reverse rotation The difference in torque ripple is reduced. Further, the cogging torque is reduced by forming a step skew in the rotor 50A.

Here, the result of measuring the torque ripple when the rotating electrical machine according to the eleventh embodiment is rotated forward and backward is shown in FIG. FIG. 23 is a diagram showing a result of measurement of torque ripple when the rotary electric machine according to Embodiment 11 of the present invention is rotated forward and backward, and FIG. 23 (a) shows a case where the maximum skew angle θ is a slot opening. FIG. 23B shows the torque ripple when the maximum skew angle θ is larger than the slot opening angle φ (comparative example). In Figure 23, the vertical axis represents the forward rotation of the torque Cripple in normalized torque ripple value (torque ripple ratio).

  FIG. 23 shows that the difference in torque ripple between forward rotation and reverse rotation decreases when the maximum skew angle θ is smaller than the slot opening angle φ compared to when the maximum skew angle θ is larger than the slot opening angle φ. It was.

  Although the eleventh embodiment has been described using the stator according to the second embodiment, the same effect can be obtained even when the stator according to the first, third, and ninth embodiments is used.

Embodiment 12 FIG.
FIG. 24 is a plan view of a rotor core in a rotary electric machine according to Embodiment 12 of the present invention, as seen from the outside in the radial direction, and FIG. 25 is a stator core in the rotary electric machine according to Embodiment 12 of the present invention. It is the top view which looked at the state which expand | deployed on the plane from the radial inside.

In FIG. 24, the rotor core 52 </ b> B is divided into three in the axial direction by a first rotor core 56, a second rotor core 57, and a third rotor core 58. Eight permanent magnets 53 are arranged at equiangular pitches on the outer peripheral surfaces of the first to third rotor cores 56, 57, and 58. The first and third rotor cores 56 and 58 are manufactured to have the same shape, and the second rotor core 57 is manufactured to have an axial length that is twice the axial length of the first and second rotor cores 56 and 58. The first and third rotor cores 56 and 58 are arranged coaxially in the axial direction so that the circumferential positions of the permanent magnets 53 coincide with each other. The first rotor core 56 and the second rotor core 58 are coaxially arranged in the axial direction so that the circumferential positions of the permanent magnets 53 are shifted from each other. The rotor 50B configured as described above has a step skew. Further, the stator facing surface of the rotor 50B facing the stator 2 is line symmetric with respect to the intersection line between the plane passing through the axial center position and orthogonal to the axis of the shaft 51 and the stator facing surface. The rotor facing surface that faces the rotor 50B of the stator 2 is asymmetric with respect to the intersecting line between the rotor facing surface and a plane that passes through the axial center position and is orthogonal to the axis of the shaft 51.
Other configurations are the same as those in the first embodiment.

  Next, the torque ripple reduction effect according to the twelfth embodiment will be described with reference to FIG. Here, the case where the magnetic pole center 27 of the rotor 50B proceeds to the left in FIG. 25 is defined as forward rotation, and the case where it proceeds to the right is defined as reverse rotation.

  When the rotor 50B rotates in the forward direction, the magnetic saturation increases in the order of the region η and the region κ. However, when the rotor 50B rotates in the reverse direction, the magnetic saturation increases in the order of the region λ and the region μ. The magnetic saturation near the point I when the rotor 50A rotates forward becomes smaller than the magnetic saturation near the point K when the rotor 50A rotates backward due to the influence of magnetic flux leakage at the shaft end. Similarly, the magnetic saturation in the vicinity of the point L when the rotor 50A rotates in the reverse direction is smaller than the magnetic saturation in the vicinity of the point J in the case of normal rotation due to the influence of magnetic flux leakage at the shaft end.

Thus, the difference in torque ripple between forward rotation and reverse rotation increases due to the difference in magnetic saturation between the shaft ends of the first and second tooth tip protrusions 6a ₁ , 6b ₁ and the central portion in the axial direction. . In the twelfth embodiment, since the slot opening angle φ is larger than the maximum skew angle θ, the magnetic saturation of the first and second tooth tip protrusions 6a ₁ and 6b ₁ is alleviated, and forward rotation and reverse rotation The difference in torque ripple is reduced. Further, the cogging torque is reduced by forming a step skew in the rotor 50B.

  Although the twelfth embodiment has been described using the stator according to the first embodiment, the same effect can be obtained even when the stator according to the second to ninth embodiments is used.

Embodiment 13 FIG.
FIG. 26 is a perspective view showing a rotor in a rotary electric machine according to Embodiment 13 of the present invention, and FIG. 27 is a schematic diagram for explaining magnetic flux leakage of a stator core in the rotary electric machine according to Embodiment 13 of the present invention. FIG. 27A shows a case where the maximum skew angle θ is smaller than the slot opening angle φ, and FIG. 27B shows a case where the maximum skew angle θ is larger than the slot opening angle φ. FIG. 28 is a diagram showing the relationship between inductance and slot opening width in a rotary electric machine according to Embodiment 13 of the present invention, where the horizontal axis is the slot opening width and the vertical axis is the d-axis inductance when the slot opening width is 3 mm. And d-axis inductance and q-axis inductance values (Ld ratio, Lq ratio) normalized by q-axis inductance. Note that Ld is a d-axis inductance and Lq is a q-axis inductance.

In FIG. 26, the rotor core 52 </ b> C is divided into two equal parts in the axial direction by a first rotor core 60 and a second rotor core 61. Then, the permanent magnets 53 are embedded on the outer peripheral sides of the first and second rotor cores 60 and 61, and eight permanent magnets 53 are arranged at an equiangular pitch. The first rotor core 60 and the second rotor core 61 are arranged coaxially in the axial direction and fixed to the shaft 51 so that the circumferential positions of the permanent magnets 53 are shifted from each other. The rotor 50 </ b> C configured as described above has a step skew, and a plane (central surface 28) that passes through the axial center position and is orthogonal to the axis of the shaft 51 serves as a step skew switching portion.
Other configurations are the same as those in the second embodiment.

  The rotor 50C is a magnet-embedded rotor, and unlike the surface magnet rotor, there is a difference between the d-axis inductance and the q-axis inductance, so that the magnetic pole position is estimated without using a magnetic pole position detector such as an encoder. And sensorless control is possible. The ratio ρ (= Lq / Ld) of the d-axis and q-axis inductance is referred to as a salient pole ratio.

Here, as shown by an arrow in FIG. 27, when the maximum skew angle θ is smaller than the slot opening angle φ, the first and second of the adjacent divided cores 3A are compared with the case where the maximum skew angle θ is larger than the slot opening angle φ. The leakage magnetic flux between the second tooth tip protrusions 6a ₂ and 6b ₂ is reduced. FIG. 28 also shows that when the slot opening width is increased, the d-axis inductance reduction rate is greater than the q-axis inductance reduction rate.
In the thirteenth embodiment, the maximum skew angle θ is smaller than the slot opening angle φ. In other words, by increasing the slot opening angle φ, the leakage magnetic flux between the first and second tooth tip protrusions 6a ₂ and 6b ₂ is reduced, but the d-axis and q-axis inductances are also reduced. However, since the d-axis inductance reduction rate is greater than the q-axis inductance reduction rate, the salient pole ratio ρ is increased, sensorless performance is improved, and sensorless control is facilitated.

  Although the thirteenth embodiment has been described using the stator according to the second embodiment, the same effect can be obtained even when the stator according to the first, third, and ninth embodiments is used.

  In each of the above embodiments, an 8-pole 12-slot rotary electric machine has been described. Needless to say, the number of poles and the number of slots are not limited to 8 poles and 12 slots. In each of the above embodiments, the number of divisions of the stator core is 12. However, the number of divisions of the stator core is also set as appropriate according to the number of slots.

1 Stator, 2, 2A, 2B, 2C, 2D Stator core, 3, 3A, 3B, 3C, 3D, 3E, 3F, 3G, 3H Split core, 4, 4E, 4F, 4G, 4H Core back part, 5, 5A , 5B, 5C, 5D teeth, 6a ₁ , 6a ₂ , 6a ₃ , 6a ₄ , 6a ₅ first tooth tip protrusion, 6b ₁ , 6b ₂ , 6b ₃ , 6b ₄ , 6b ₅ second tooth tip protrusion, 7 Wire winding portion, 10 Stator coil, 10a Concentrated winding coil, 19, 21 Fitting portion, 20, 22 Fitted portion, 23 Positioning hole, 24 Escape groove, 50, 50A, 50B, 50C Rotor, 51 Shaft , 52, 52A, 52B, 52C rotor core, 53 permanent magnet, 100 rotating electric machine.

Claims (9)

Each of the core back portions is formed by laminating electromagnetic steel plates, and the split cores having teeth that project radially inward from the inner peripheral surface of the arc-shaped core back portion and the core back portion are arranged side by side in the circumferential direction of the core back portion. A stator having a ring-shaped stator core configured to be aligned in the circumferential direction and a coil wound around the teeth;
In a rotating electrical machine including a rotor disposed coaxially with a gap inside the stator,
The teeth protrude from the inner peripheral surface of the core back portion radially inward with a constant circumferential width and extend in the axial direction, and project from the tip of the electric wire winding portion to both sides in the circumferential direction. A pair of teeth tip protrusions,
Each of the pair of teeth tip protrusions has a maximum overhang portion with a maximum overhang amount and a minimum overhang portion with a minimum overhang amount,
The minimum value of the circumferential angle between the teeth tip protrusions of the teeth adjacent to each other in the circumferential direction is φ,
An intersection A1 between the extension line of the side surface of the wire winding portion on the side of the maximum projecting portion and the inner peripheral surface of the tip of the teeth in a plane orthogonal to the axis of the rotor and passing through the maximum projecting portion, The circumferential angle between the first radial line passing through the circumferential end of the maximum projecting portion and the intersection B1 of the tip inner peripheral surface of the tooth is θ1,
An intersection A2 between an extension line of a side surface of the minimum overhanging portion of the wire winding portion and an inner peripheral surface of the tip of the teeth in a plane orthogonal to the axis of the rotor and passing through the minimum overhanging portion, and the minimum When the circumferential angle between the second radial line passing through the circumferential end of the overhang and the intersection B2 of the inner peripheral surface of the tooth is θ2,
A rotating electrical machine that satisfies 2 × θ2 <θ1 <θ2 + φ and 3 × θ2 <θ1 <6 × θ2 . The rotating electrical machine according to claim 1, wherein θ1 = 4.5 × θ2 is established.   The rotating electrical machine according to claim 1 or 2, wherein the adjacent split cores are connected to each other in the circumferential direction of the core back portion by fitting the fitting portion and the fitted portion. The rotating electrical machine according to any one of claims 1 to 3, wherein the positioning hole is formed so as to penetrate the core back portion in the axial direction. Each of the core back portions is formed by laminating electromagnetic steel plates, and the split cores having teeth that project radially inward from the inner peripheral surface of the arc-shaped core back portion and the core back portion are arranged side by side in the circumferential direction of the core back portion. A stator having a ring-shaped stator core configured to be aligned in the circumferential direction and a coil wound around the teeth;
In a rotating electrical machine including a rotor disposed coaxially with a gap inside the stator,
The teeth protrude from the inner peripheral surface of the core back portion radially inward with a constant circumferential width and extend in the axial direction, and project from the tip of the electric wire winding portion to both sides in the circumferential direction. A pair of teeth tip protrusions,
Each of the pair of teeth tip protrusions has a maximum overhang portion with a maximum overhang amount and a minimum overhang portion with a minimum overhang amount,
The minimum value of the circumferential angle between the teeth tip protrusions of the teeth adjacent to each other in the circumferential direction is φ,
An intersection A1 between the extension line of the side surface of the wire winding portion on the side of the maximum projecting portion and the inner peripheral surface of the tip of the teeth in a plane orthogonal to the axis of the rotor and passing through the maximum projecting portion, The circumferential angle between the first radial line passing through the circumferential end of the maximum projecting portion and the intersection B1 of the tip inner peripheral surface of the tooth is θ1,
An intersection A2 between an extension line of a side surface of the minimum overhanging portion of the wire winding portion and an inner peripheral surface of the tip of the teeth in a plane orthogonal to the axis of the rotor and passing through the minimum overhanging portion, and the minimum When the circumferential angle between the second radial line passing through the circumferential end of the overhang and the intersection B2 of the inner peripheral surface of the tooth is θ2,
2 × θ2 <θ1 <θ2 + φ holds,
A positioning hole is formed so as to penetrate the core back portion in the axial direction,
An escape groove is formed so as to communicate the positioning hole and the radially outer side of the core back portion along the radial direction ,
A rotating electrical machine in which a circumferential width of the escape groove is smaller than a diameter of the positioning hole .   The inner peripheral surface of the tip of the teeth of the split core is perpendicular to the axis of the rotor and passes through the center position in the axial direction of the split core, and the intersecting line of the inner peripheral surface of the tip of the teeth The rotating electrical machine according to any one of claims 1 to 5, which is line-symmetric.   The rotating electrical machine according to claim 6, wherein the rotor has a step skew structure in which a step skew switching portion is provided at a central position in the axial direction. The inner peripheral surface of the tip of the teeth of the split core is asymmetric with respect to a plane orthogonal to the axial center of the rotor and passing through the axial center position of the split core,
A stator facing surface of the rotor facing the stator is configured in a step skew structure, and intersects with a plane that is perpendicular to the axis of the rotor and passes through the center position in the axial direction of the split core and the stator facing surface. The rotating electrical machine according to claim 1, wherein the rotating electrical machine is line-symmetric with respect to the line.   The rotating electrical machine according to any one of claims 1 to 8, wherein the rotor is a magnet-embedded rotor.

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