JP6659015B2 - Stator and rotating machine - Google Patents

Description

  The present invention relates to a stator having a divided structure and a rotating machine having the stator having a divided structure.

DESCRIPTION OF RELATED ART Conventionally, as a stator which comprises a rotary machine, the 1st member which has a yoke part, and the teeth part formed by the teeth base part and the teeth front-end | tip part, as disclosed in patent document 1 are connected. A stator configured by assembling a second member having a connecting portion (referred to as a “split-structure stator”) is used. In the stator having such a split structure, the first member and the second member are assembled after the stator winding is wound around the teeth portion of the second member. As a method of assembling the first member and the second member, for example, a method of press-fitting or shrink-fitting a portion of the teeth portion on the outer peripheral side of the teeth base into a groove formed on the inner peripheral side of the yoke portion is used. .
By using the stator having the divided structure, the stator winding can be wound around the teeth portion in a state where the yoke portion is not arranged on the outer peripheral side of the slot formed by the teeth and the adjacent teeth portion. , The winding density of the stator winding can be increased.

JP-A-63-174531

Conventionally, various studies have been made on using a stator having a divided structure in order to increase the winding density of the stator winding in the slot. However, the relationship between the angle between the outer peripheral wall of the tooth tip forming the teeth of the second member and the center line in the circumferential direction of the teeth when the stator having the split structure is used and the efficiency of the rotating machine. Furthermore, the relationship between the number of teeth (the number of slots), the angle between the outer peripheral wall of the tooth tip and the circumferential centerline of the teeth, and the efficiency of the rotating machine has not been studied.
The present invention has been made in view of such a point, and has a rotation provided with a stator configured by assembling a first member having a yoke portion and a second member having a teeth portion and a connection portion. It is an object of the present invention to provide a new technology capable of improving the efficiency of a machine.

The present invention is configured as follows.
Note that the description “axial center” indicates the rotational center of the rotor (rotating shaft) in a state where the rotor is rotatably arranged with respect to the stator. The description “axial center line” indicates a rotational center line passing through the axial center (rotation center) in a state where the rotor is rotatably arranged with respect to the stator. The description “circumferential direction” refers to a circumference around the shaft center when viewed from a direction perpendicular to the shaft center line (rotation center line) in a state where the rotor is rotatably arranged with respect to the stator. Indicates the direction. The term "radial direction" indicates a direction passing through the shaft center when viewed from a direction perpendicular to the shaft center line in a state where the rotor is rotatably arranged with respect to the stator.
The first to third inventions relate to a stator of a rotating machine.
The stator of the present invention is configured by assembling a first member and a second member. The first member has a yoke portion extending along a circumferential direction, and the second member has a tooth base and a tooth base extending along a radial direction when viewed from a direction orthogonal to the axis center line. And a plurality of teeth formed by teeth tips extending in the circumferential direction, and a plurality of connecting portions for connecting teeth tips adjacent in the circumferential direction. .
The tooth base has first and second side walls and an end wall. The first and second side walls are arranged on one side and the other side along the circumferential direction with the center line (center line in the circumferential direction) of the tooth portion passing through the axial center, and extend in the radial direction. ing. The end wall is disposed between the ends (outer peripheral end) of the first and second side walls opposite to the axial center, and extends in the circumferential direction.
The tooth tip has first and second outer peripheral walls and an inner peripheral wall. The first outer peripheral wall extends to one side along the circumferential direction from an axial center end (inner peripheral end) of the first side wall of the tooth base, and the second outer peripheral wall includes a tooth. The second side wall of the base extends from the end on the axial center side to the other side along the circumferential direction. The inner peripheral wall is disposed closer to the axial center (inner peripheral side) along the radial direction than the first and second outer peripheral walls, and extends along the circumferential direction.
The connecting portion has a first connecting wall and a second connecting wall. The first connection wall connects the second outer peripheral wall of the tooth tip adjacent to one side in the circumferential direction and the first outer peripheral wall of the tooth tip adjacent to the other side. The second connection wall connects the inner peripheral walls of the teeth tip portions adjacent on both sides along the circumferential direction.
A portion of the tooth base opposite to the axis center (a portion on the outer peripheral side) is assembled to the yoke portion. As a method of assembling the outer peripheral portion of the tooth base to the yoke portion, typically, a method of tightly fitting the outer peripheral portion of the tooth base to a groove formed on the inner peripheral side of the yoke portion is used. "Tight fit" refers to a method of inserting and fixing a member having an outer diameter slightly larger than the inner diameter of the hole into the hole. Typically, a press-fitting method or a shrink-fitting method is used as a method of tightly fitting the outer peripheral portion of the tooth base into the groove.
The first connecting wall extends in an arc shape depressed toward the center of the axis along the radial direction, and the second connecting wall has the same curvature as the first connecting wall and has an axial center along the radial direction. A bottom wall extending in an arc shape depressed to the side, and a first side wall and a second side wall extending in a straight line, and having a depression on a side opposite to the axial center along the radial direction. Forming a concave portion.
The stator of the first invention is provided with six teeth (or slots), and is formed by the center line of the teeth and the extending direction of the first outer peripheral wall (second outer peripheral wall) at the tip of the teeth. The angle θ satisfies [50 degrees ≦ θ ≦ 60 degrees].
In the stator according to the second aspect of the present invention , nine teeth (or slots) are provided, and depending on the center line of the teeth and the extending direction of the first outer peripheral wall (second outer peripheral wall) at the tip of the tooth. The formed angle θ satisfies [50 degrees ≦ θ ≦ 70 degrees].
Further, the stator according to the third aspect of the present invention is provided with twelve teeth (or slots), and depends on the center line of the teeth and the extending direction of the first outer peripheral wall (second outer peripheral wall) at the tooth tip. The formed angle θ satisfies [45 degrees ≦ θ ≦ 75 degrees].
By using the stator of the first to third inventions, the efficiency of a rotating machine having 6, 9, or 12 teeth (or slots) can be increased.
Further, since the second connecting wall is recessed in the radial direction on the side opposite to the axial center, when a stress generated by assembling the first member and the second member acts on the tooth tip, The second connecting wall can be prevented from protruding toward the axial center from the inner peripheral wall of the tooth tip. In addition, the stress acting near the ends on both sides in the circumferential direction of the tooth tip (near the connecting portion) is absorbed by the recessed second connecting wall and is reduced. Thereby, the magnetic resistance near the circumferential ends of the tooth tip (near the connecting portion) is reduced, and the magnetic flux flows to the vicinity of the connecting portion.
In addition, since the second connecting wall is recessed radially in the opposite direction to the axis center and the first connecting wall is recessed radially in the axial center side, the connecting portion of the tooth tip portion is formed. It is possible to suppress the amount of the magnetic flux flowing to the vicinity, and reduce cogging torque and torque pulsation.
A fourth invention relates to a rotating machine.
A rotating machine according to the present invention includes a stator and a rotor rotatably disposed with respect to the stator. As the stator, any one of the aforementioned stators is used.
The rotating machine of the present invention has the same effects as the above-described stator.
In a different embodiment of the fourth invention , when the gap between the stator and the rotor is G, the depth (length along the radial direction) D and the width (length along the radial direction) of the concave portion formed by the second connecting wall. The length L along the circumferential direction) is configured to satisfy [D ≧ 0.5G] and [L ≧ 2G], respectively.
In the present embodiment, the cogging torque can be reduced by the second connecting wall.

  By using the stator and the rotating machine of the present invention, it is possible to improve the efficiency of the rotating machine having the stator configured by assembling the first member having the yoke portion and the second member having the teeth portion. .

It is a figure showing a 1st embodiment of a rotating machine of the present invention. FIG. 2 is an exploded view of the first embodiment of the stator of the present invention used in the rotating machine of the first embodiment. It is the elements on larger scale of FIG. It is a figure showing a 2nd embodiment of a rotary machine of the present invention. It is a figure showing a 3rd embodiment of a rotating machine of the present invention. 5 is a graph showing the relationship between the angle θ, efficiency, and slot cross-sectional area of the rotating machine according to the first embodiment. It is a graph which shows the relationship between the angle (theta) of a rotary machine of 2nd Embodiment, efficiency, and slot cross-sectional area. It is a graph which shows the relationship between the angle (theta) of a rotary machine of 3rd Embodiment, efficiency, and a slot cross-sectional area. It is the elements on larger scale of the 4th embodiment of the stator of the present invention used in the 4th embodiment of the stator of the present invention. It is the elements on larger scale of the 5th embodiment of the stator of the present invention used in the 5th embodiment of the stator of the present invention. It is the elements on larger scale of the 6th embodiment of the stator of the present invention used in the 6th embodiment of the stator of the present invention.

An embodiment of the present invention will be described below with reference to the drawings.
In this specification, the term “axial center” indicates the rotational center of the rotor (rotating shaft) in a state where the rotor is rotatably arranged with respect to the stator. The expression “axial center line” indicates a rotational center line passing through the axial center when the rotor is rotatably arranged with respect to the stator. The term "circumferential direction" indicates a circumferential direction about the axis center when viewed from a direction orthogonal to the axis center line in a state where the rotor is rotatably arranged with respect to the stator. The term "radial direction" indicates a direction passing through the shaft center when viewed from a direction perpendicular to the shaft center line in a state where the rotor is rotatably arranged with respect to the stator.

A first embodiment of the rotating machine of the present invention is shown in FIGS. In each of the embodiments described below, the rotating machine of the present invention is configured as an electric motor.
FIG. 1 is a diagram of the rotating machine 100 according to the first embodiment as viewed from a direction orthogonal to an axis center line passing through an axis center P. FIG. 2 is an exploded view of the stator 110 used in the rotating machine 100 of the first embodiment, and FIG. 3 is a partially enlarged view of FIG. The stator 110 shows the first embodiment of the stator of the present invention.

The rotating machine 100 of the present embodiment includes a stator 110, a rotor 180, and a rotating shaft 190.
The rotating shaft 190 is press-fitted or shrink-fit into a rotating shaft insertion hole formed in the rotor 180. The rotor 180 is rotatable in a state where an air gap (air gap) G is held between the outer peripheral surface 181 of the rotor 180 and the inner peripheral surface of the stator 110 (the inner peripheral wall 163 of the tooth tip 160 described later). Are located.

The stator 110 is formed separately, and includes a first member 120 and a second member 130 that can be assembled. The first member 120 and the second member 130 are configured by a plurality of laminated electromagnetic steel sheets.
The first member 120 has a yoke portion 121 extending along the circumferential direction when viewed from a direction orthogonal to the axis center line.
The yoke part 121 is formed in a ring shape (cylindrical shape) having an outer peripheral surface 122 and an inner peripheral surface 123. Further, the yoke portion 121 has a groove 124 formed on the inner peripheral side, the groove 124 being open on the side of the shaft center P (recessed on the side opposite to the shaft center P). The first member 120 and the second member 130 are assembled by tightly fitting a portion (outer peripheral portion) of the tooth base 150 on the end wall 151 side described later into the groove 124.
In the present embodiment, as shown in FIG. 3, the groove 124 is formed by the bottom wall 124a, the first side wall 124b, and the second side wall 124c. The first side wall 124b and the second side wall 124c are arranged at positions separated by a predetermined distance along the circumferential direction, and extend linearly along the radial direction. Further, the bottom wall 124a is disposed between the ends of the first side wall 124b and the second side wall 124c on the opposite side (outer peripheral side) to the axial center P, and extends linearly along the circumferential direction. I have.

The second member 130 has a tooth part 140 and a connecting part 170.
The teeth portion 140 extends radially when viewed from a direction perpendicular to the axis center line. The teeth portion 140 is provided on the shaft center P side (inner peripheral side) of the teeth base portion 150 and extends in the circumferential direction. Is formed by a tooth tip portion 160 extending along.
The tooth base 150 has an end wall 151, a first side wall 152, and a second side wall 153. The first side wall 152 and the second side wall 153 are arranged on both sides in the circumferential direction with respect to the center line (circumferential center line) T of the tooth portion 140 passing through the axial center P, and extend linearly along the radial direction. Are there. In FIG. 3, the first side wall 152 is disposed on the clockwise (clockwise) side along the circumferential direction with respect to the center line T of the tooth portion 140, and on the counterclockwise (counterclockwise) side. A second side wall 153 is disposed. The end wall 151 is arranged between the ends of the first side wall 152 and the second side wall 153 on the opposite side (outer peripheral side) to the axial center P, and extends linearly along the circumferential direction.
In the present specification, the clockwise direction (clockwise direction) and the clockwise direction side (clockwise direction side) are referred to as “one direction” and “one side”, and the counterclockwise direction (counterclockwise direction) and the counterclockwise direction. The clockwise direction (counterclockwise direction) is referred to as “other direction” and “other side”.

The tooth tip 160 has a first outer wall 161, a second outer wall 162, and an inner wall 163. The first outer peripheral wall 161 extends linearly from the end of the first side wall 152 of the tooth base 150 on the axial center P side (inner peripheral side) to one side along the circumferential direction. . The second outer peripheral wall 162 extends linearly from the end of the second side wall 153 of the tooth base 150 on the axial center P side (inner peripheral side) to the other side along the circumferential direction. . The inner peripheral wall 163 is disposed closer to the axial center P than the first outer peripheral wall 161 and the second outer peripheral wall 162 in the radial direction, and extends in the circumferential direction.
The inner peripheral wall 163 of the tooth tip 160 forms the inner peripheral surface of the stator 110 facing the outer peripheral surface 181 of the rotor 180. Typically, the inner peripheral wall 163 has an arc shape centered on the axial center P.
An angle formed by the center line T of the tooth portion 140 passing through the axial center P and the extending direction (extended line) of the first outer peripheral wall 161 (second outer peripheral wall 162) is defined as θ.

The connecting section 170 has a first connecting wall 171 and a second connecting wall 172.
The first connecting wall 171 connects the first outer peripheral wall 161 and the second outer peripheral wall 162 of the adjacent tooth tip 160. In the present embodiment, the first connection wall 171 extends linearly along the circumferential direction. In FIG. 3, one end 171A of the first connection wall 171 along the circumferential direction is connected to the second outer peripheral wall 162 of the tooth tip 160 disposed on one side along the circumferential direction. The other end 171B on the other side in the circumferential direction is connected to the first outer peripheral wall 161 of the tooth tip 160 arranged on the other side in the circumferential direction.
The second connecting wall 172 connects the inner peripheral wall 163 of the adjacent tooth tip 160. In the present embodiment, the second connecting wall 172 has a bottom wall 172a, a first side wall 172b, and a second side wall 172c. The first side wall 172b and the second side wall 172c are arranged at locations separated along the circumferential direction, and extend linearly along the radial direction. The bottom wall 172a is arranged between ends of the first side wall 172b and the second side wall 172c on the opposite side (outer peripheral side) to the axial center P, and extends linearly along the circumferential direction. The second connection wall 172 forms a concave portion that is open on the side of the shaft center P, that is, is depressed on the opposite side (outer peripheral side) of the shaft center P.

In the case where the stator 110 has a divided structure, if the stator 110 is divided for each tooth portion 140, assembling work or the like becomes difficult. Therefore, the teeth member 140 adjacent in the circumferential direction is connected by the connecting portion 170 to form the second member 130, thereby facilitating the assembling work and the like.
However, the magnetic flux flowing between the teeth tip portions 160 adjacent in the circumferential direction via the connecting portion 170 does not flow through the rotor 180, and does not contribute to driving the rotor 180. For this reason, it is necessary to suppress the amount of the magnetic flux flowing through the connecting portion 170 (the amount of the leakage magnetic flux). For example, by reducing (smaller) the thickness in the radial direction, the amount of magnetic flux flowing through the connecting portion 170 can be suppressed.
On the other hand, in order to suppress deformation of the connecting portion 170 due to stress generated by assembling the first member 120 and the second member 130, the connecting portion 170 needs to have strength. For example, by increasing (increase) the thickness in the radial direction, the strength of the connecting portion 170 can be increased.
Therefore, the shape (for example, the thickness along the radial direction and the length along the circumferential direction) of the connecting portion 170 depends on the strength against stress while suppressing the amount of magnetic flux (the amount of leakage magnetic flux) passing through the connecting portion 170. Is set to be able to be secured.
The connecting portion 170 is disposed so as to intersect the center line S of the slot passing through the axial center P, and preferably to be line-symmetric with respect to the center line S of the slot.

The first member 120 and the second member 130 are assembled with a stator winding (not shown) wound around the teeth 140 of the second member 130.
As a method of assembling the first member 120 and the second member 130, a portion (outer peripheral portion) of the tooth base 150 of the second member 130 opposite to the axis center P is a yoke portion of the first member 110. A method of tightening in a groove 124 formed in 121 is used. "Tight fit" refers to a method of inserting and fixing a member having an outer diameter slightly larger than the inner diameter of the hole into the hole. A press-fitting method or a shrink fitting method is used as a method of tightening the outer peripheral side portion of the tooth base 150 into the groove 124. For this reason, the distance (length) between the end wall 151 of the tooth base 150 and the shaft center P is set slightly longer than the distance (length) between the bottom wall 124a of the groove 124 and the shaft center P, The distance (width) between the first side wall 152 and the second side wall of the tooth base 150 is smaller than the distance (width) between the first side wall 124b and the second side wall 124c of the groove 124. It is set long.
When the first member 120 and the second member 130 are assembled, a slot into which the stator winding is inserted is formed by the teeth portion 140, the yoke portion 121, and the connecting portion 170 that are circumferentially adjacent to each other.
In the present embodiment, six teeth portions 140 (slots) are provided.
As the rotor 180, a rotor corresponding to the type of the rotating machine 100 is used. For example, in a permanent magnet embedded motor, a rotor having a magnet insertion hole and a permanent magnet inserted into the magnet insertion hole is used.

In addition, when the first member 120 and the second member 130 are assembled, stress is generated particularly by tightening the outer peripheral side portion of the tooth base 150 into the groove 124 of the yoke portion 121.
The length (width) of the connecting portion 170 in the radial direction is set short in order to suppress the flow of the magnetic flux through the connecting portion 170 (suppress the leakage magnetic flux).
For this reason, when the second connecting wall 172 of the connecting portion 170 extends linearly, when the stress generated in the second member 130 acts on the connecting portion 170, the second connecting wall 172 is There is a possibility that the teeth may protrude from the inner peripheral wall 163 of the tooth tip 160 to the axial center P side (inner peripheral side).
In the present embodiment, the second connecting wall 172 of the connecting portion 170 is recessed in the radial direction on the side opposite to the axial center P. Accordingly, even when the stress acts on the connecting portion 170, it is possible to prevent the bottom wall 172a of the second connecting wall 172 from protruding from the inner peripheral wall 163 of the tooth tip 160 toward the axial center P.
Further, since the second connecting wall 172 of the connecting portion 170 is depressed, the stress acting on the portion of the tooth tip 160 near the connecting portion 170 is absorbed by the second connecting wall 172 and reduced. Here, when a stress (particularly, a compressive stress) acts on the magnetic steel sheet constituting the second member 130, the magnetic resistance increases and the magnetic flux becomes difficult to flow.

In the present embodiment, the stress acting on the tooth tip 160 is reduced by the second connecting wall 172 that is recessed on the outer peripheral side, so that an increase in the magnetic resistance of the tooth tip 160 is suppressed. As a result, the magnetic flux flows to the portion near the connecting portion 170 at the tip end portion of the teeth, and it is possible to suppress a decrease in the output of the rotating machine.
In the present embodiment, the length (depth) D (mm) along the radial direction and the length (width) L (mm) along the circumferential direction of the concave portion formed by the second connecting wall 172 are [ D ≧ 0.5G] and [L ≧ 2G]. G (mm) is a gap (air gap) between the outer peripheral surface 181 of the rotor 180 and the inner peripheral surface of the stator 110 (the inner peripheral wall 163 of the tooth tip 160).
By setting the depth D and the width L of the concave portion formed by the second connecting wall 172 as described above, the compressive stress can be concentrated on the connecting portion 170. Thereby, the magnetic permeability of the connecting portion 170 formed of the electromagnetic steel sheet decreases and the magnetic resistance increases, so that the flow of magnetic flux (leakage magnetic flux) through the connecting portion 170 can be effectively suppressed. . Therefore, the current flowing through the stator winding can be reduced, and the efficiency of the rotating machine can be improved.
In addition, by concentrating the compressive stress on the connecting portion 170, the compressive stress hardly acts on the tooth tip 160, and an increase in the magnetic resistance of the tooth tip 160 can be effectively suppressed. Therefore, the magnetic flux can flow to the vicinity of the connecting portion 170 of the tooth tip 160, so that the magnetic flux flowing through the tooth tip 160 increases, and the output density per unit volume can be improved.
Further, the cogging torque is reduced by configuring the depth D and the length L of the concave portion formed by the second connecting wall so as to satisfy [D ≧ 0.5G] and [L ≧ 2G]. Therefore, noise and vibration due to cogging torque can be reduced.

A second embodiment 200 of the rotating machine of the present invention and a second embodiment 210 of the stator of the present invention are shown in FIG. Note that, in FIG. 4, components denoted by reference numerals that are the same as those denoted by the components illustrated in FIG. 1 except for the third digit indicate equivalents.
The rotating machine 200 according to the second embodiment (the stator 210 according to the second embodiment) is different from the rotating machine 100 according to the first embodiment in that nine teeth 240 (slots) are provided. This is different from the stator 110) of the embodiment.

A third embodiment 300 of the rotating machine of the present invention and a third embodiment 310 of the stator of the present invention are shown in FIG. Note that, in FIG. 5, components denoted by reference numerals that are the same as those denoted by the components illustrated in FIG. 1 except for the third digit are equivalent.
The rotating machine 300 of the third embodiment (the stator 310 of the second embodiment) is different from the rotating machine 100 of the first embodiment in that twelve teeth portions 340 (slots) are provided. This is different from the stator 110) of the embodiment.

Next, when the number of teeth (slots) is 6, 9, or 12, the center line T of the teeth 140 and the first outer peripheral wall 161 (the second outer peripheral wall) of the tooth tip 160 are used. The relationship between the angle θ (hereinafter, simply referred to as “angle θ”) formed by the extending direction (extended line) of 162) and the efficiency of the rotating machine will be described with reference to FIGS.
6 to 8, the horizontal axis indicates the angle θ (degree), the left vertical axis indicates the efficiency (%) of the rotating machine, and the right vertical axis indicates the slot cross-sectional area (mm ² ). I have. The solid line is a graph showing the efficiency of the rotating machine, and the broken line is a graph showing the slot cross-sectional area.
Here, as described above, the thickness of the connecting portion along the radial direction and the length along the circumferential direction, etc., can reduce the strength of the stress while suppressing the amount of magnetic flux (the amount of leakage magnetic flux) passing through the connecting portion. It is set so that it can be secured. That is, the thickness, length, and the like of the connecting portion are determined in advance. Therefore, the graphs shown in FIGS. 6 to 8 show that the first outer peripheral wall 161 of the tooth tip portion 160 is connected to the other of the first connecting wall 171 of the connecting portion 170 as shown in FIG. By rotating around the end 171B of the side, or by rotating the second outer peripheral wall 162 of the tooth tip 160 around the end 171A on one side of the first connecting wall 171 of the connecting portion 170. This changes the angle θ.
For example, when the first outer peripheral wall 161 (the second outer peripheral wall 162) is disposed at the position shown by the solid line in FIG. 3, the angle θ is the first outer peripheral wall 161 (the second outer peripheral wall 162). ) Is greater than the angle θ when it is arranged at the position shown by the broken line in FIG. That is, the angle θ increases as the first outer peripheral wall 161 is rotated counterclockwise (the other direction) about the other end 171B of the first connection wall 171. The angle θ increases as the second outer peripheral wall 162 is rotated clockwise (one direction) about the end 171A on one side of the first connection wall 171.

FIG. 6 is a graph showing the relationship between the efficiency and the slot cross-sectional area with respect to the angle θ for a rotating machine having six teeth (or slots) (for example, the rotating machine 100 shown in FIG. 1). It is shown.
FIG. 7 is a graph showing the relationship between the efficiency and the slot cross-sectional area with respect to the angle θ for a rotating machine having nine teeth (or slots) (for example, the rotating machine 200 shown in FIG. 4). It is shown.
FIG. 8 is a graph showing the relationship between the efficiency and the slot cross-sectional area with respect to the angle θ for a rotating machine having 12 teeth (or slots) (for example, the rotating machine 300 shown in FIG. 5). It is shown.

It can be seen from the graphs shown in FIGS. 6 to 8 that the slot cross-sectional area increases as the angle θ increases.
Further, the efficiency increases as the angle θ increases in a region where the angle θ is small, and decreases as the angle θ increases in a region where the angle θ is large. It can be seen that does not vary significantly.
This is for the following reason.
When the angle θ is small and the cross-sectional area of the slot is small, it is necessary to use a stator winding having a small diameter in order to insert the stator winding having the set number of turns into the slot. The resistance of the smaller diameter stator winding is greater than the resistance of the larger diameter stator winding. Therefore, when a stator winding having a small diameter is used, the resistance of the stator winding increases, and the loss of the stator winding increases. Therefore, in a region where the angle θ is small, a stator winding having a large diameter can be used as the angle θ increases. Thereby, the resistance of the stator winding is reduced and the loss of the stator winding is reduced, so that the efficiency is improved.
When the angle θ reaches a predetermined value, a stator winding having a predetermined diameter can be inserted into the slot in a predetermined number of turns. Therefore, even if the angle θ increases, the efficiency does not change significantly.
When the angle θ further increases, the length (width) of the tooth tip along the radial direction decreases as the slot cross-sectional area increases. When the length (thickness) of the tooth tip along the radial direction is reduced, the magnetic flux does not flow to the end (near the connecting portion) of the tooth tip along the circumferential direction. For this reason, in a region where the angle θ is large, the efficiency decreases as the angle θ increases.

Therefore, from the graph shown in FIG. 6, when six teeth portions (slots) are provided, the center line of the tooth portion and the first outer peripheral wall (second outer peripheral wall) of the tooth tip portion are provided. It can be understood that the efficiency of the rotating machine can be increased by configuring so that the angle θ formed by the extending direction (extending line) satisfies [50 degrees ≦ θ ≦ 60 degrees].
Also, from the graph shown in FIG. 7, when nine teeth portions (slots) are provided, the center line of the tooth portion and the first outer peripheral wall (second outer peripheral wall) of the tooth tip end portion. It can be understood that the efficiency of the rotating machine can be increased by configuring the angle θ formed by the extending direction (extended line) of the rotating machine to satisfy [50 degrees ≦ θ ≦ 70 degrees].
Also, from the graph shown in FIG. 8, when twelve teeth (slots) are provided, the center line of the teeth and the first outer peripheral wall (second outer peripheral wall) of the tip of the teeth. It can be understood that the efficiency of the rotating machine can be increased by configuring so that the angle θ formed by the extending direction (extending line) satisfies [45 degrees ≦ θ ≦ 75 degrees].

  In the rotating machines 100, 200, and 300 of the first, second, and third embodiments (the stators 110, 120, and 310 of the first, second, and third embodiments), a linear first connection is used. Although the connecting portion having the wall and the second connecting wall depressed on the outer peripheral side is used, a connecting portion having another configuration may be used.

FIG. 9 shows a partially enlarged view of the second member 430 constituting the stator of the rotating machine of the fourth embodiment (the stator of the fourth embodiment).
The second member 430 shown in FIG. 9 has a tooth portion 440 formed by the tooth base portion 450 and the tooth tip portion 460, and a connecting portion 470 for connecting the adjacent tooth portion 440 (the tooth tip portion 460). are doing.
The connecting portion 470 is a first connecting wall 471 connecting the first outer peripheral wall 461 and the second outer peripheral wall 462 of the adjacent tooth tip 460 and a second connecting wall 463 connecting the adjacent tooth distal end 460. It has two connecting walls 472.
The first connecting wall 471 extends in a curved shape that is depressed toward the shaft center P side (inner peripheral side). In the present embodiment, the first connection wall 471 has an arc shape.
The second connecting wall 472 has a linear bottom wall 472a, a first side wall 472b, and a second side wall 472c, like the second connecting wall 172 of the first embodiment, and has a concave on the outer peripheral side. Forming a concave portion.
In the present embodiment, the first connecting wall 471 has a curved shape (curved) depressed toward the axial center P. As a result, the portion of the connecting portion 470 at the center in the circumferential direction of the first connecting wall 471 (the portion intersecting with the slot center line S) is further compressed, so that the magnetic permeability is further reduced and the magnetic resistance is further increased. . On the other hand, in the portion of the connecting portion 470 on the tooth tip 460 side, a tensile stress acts, so that the magnetic permeability increases and the magnetic resistance decreases. Thereby, the magnetic resistance of the portion near the connecting portion 470 of the tooth tip 460 is further reduced, and the magnetic flux is more easily flowed to the portion of the tooth tip 460 near the connecting portion 470. Therefore, the output density per unit volume can be improved.
Even when the connecting portion 470 shown in FIG. 9 is used for the rotating machine (first to third stators) of the first to third embodiments, the rotating machine of the first to third embodiments ( This has the same effect as the first to third stators).

FIG. 10 is a partially enlarged view of a second member 530 constituting a stator of the rotating machine according to the fifth embodiment (a stator according to the fourth embodiment).
The connecting portion 570 of the second member 530 shown in FIG. 10 is connected to the first connecting wall 571 connecting the first outer peripheral wall 561 and the second outer peripheral wall 562 of the adjacent tooth tip 560 to the adjacent one. A second connection wall 572 that connects the inner peripheral wall 563 of the tooth tip 560 to be formed.
The first connecting wall 571 has a bottom wall 571a, a first side wall 571b, and a second side wall 571c extending linearly, and forms a concave portion that is depressed toward the axial center P.
The second connecting wall 572 has a bottom wall 572a, a first side wall 572b, and a second side wall 572c extending linearly, similarly to the second connecting wall 172 of the first embodiment. , Are formed on the outer peripheral side.
In the present embodiment, the first connection wall 571 forms a concave portion that is depressed on the shaft center P side (inner circumference side), and the second connection wall 572 forms the opposite side (outer circumference side) with respect to the shaft center P. Since the concave portion is formed in the tooth, the magnetic flux can be prevented from flowing to the vicinity of the connecting portion of the tooth tip 560, and cogging torque and torque pulsation can be reduced.
Also when the connecting portion 570 shown in FIG. 10 is used for the rotating machine (first to third stators) of the first to third embodiments, the rotating machine of the first to third embodiments ( This has the same effect as the first to third stators).

FIG. 11 is a partially enlarged view of the second member 630 that constitutes the stator of the rotating machine of the sixth embodiment (the stator of the fourth embodiment).
The connecting portion 670 of the second member 630 shown in FIG. 11 is connected to the first connecting wall 671 connecting the first outer peripheral wall 661 and the second outer peripheral wall 662 of the adjacent tooth tip 660 to the adjacent one. A second connection wall 672 that connects the inner peripheral wall 663 of the tooth tip 660 to be formed.
The first connecting wall 671 extends in a curved shape that is depressed toward the shaft center P side (inner peripheral side). In the present embodiment, the first connection wall 671 has an arc shape.
The second connection wall 672 has a bottom wall 672a extending in a curved shape, a first side wall 672b and a second side wall 672c extending in a straight line, and is opposite to the axis center P ( A concave portion is formed on the outer peripheral side). The bottom wall 672a forming the second connecting wall 672 has a curved shape protruding toward the shaft center P (inner side). In the present embodiment, the bottom wall 672a of the second connection wall 672 has an arc shape having the same curvature as the arc shape of the first connection wall 671.
In the present embodiment, the length (depth) D along the radial direction of the concave portion formed by the second connection wall 672 is determined by the virtual extension line of the inner peripheral wall 663 of the tooth tip 660 and the bottom wall 672a. Is the minimum interval between
In the present embodiment, the first connecting wall 671 has a curved shape depressed toward the shaft center P, and the bottom wall 672a of the second connecting wall 672 projects toward the shaft center P. It has a shape. As a result, the portion at the center in the circumferential direction of the connecting portion 670 (the portion intersecting with the slot center line S) is further compressed, so that the magnetic permeability is further reduced and the magnetic resistance is further increased. On the other hand, since the tensile stress acting on the portion near the connecting portion 670 of the tooth tip 660 is further reduced, the magnetic resistance of the portion near the connecting portion 670 of the tooth tip 660 is further reduced, and the magnetic flux is reduced. 660, it is easy to flow to a portion near the connecting portion 670. Therefore, the output density per unit volume can be further improved.
Even when the connecting portion 670 shown in FIG. 11 is used for the rotating machine (first to third stators) of the first to third embodiments, the rotating machine of the first to third embodiments ( This has the same effect as the first to third stators).

The present invention is not limited to the configuration described in the detailed description, and various changes, additions, and deletions are possible.
The method of assembling the first member and the second member is not limited to the interference fit, and various assembling methods can be used.
The shapes of the first member and the second member can be variously changed.
The configuration of the connecting portion can be variously changed. For example, a connecting portion having a straight first connecting wall and a straight second connecting wall may be used.
The configurations described in the embodiments can be used alone or in combination with a plurality of appropriately selected configurations.
The rotating machine of the present invention can be configured as various types of rotating machines.
The stator of the present invention can be used for various rotating machines.

100, 200, 300 Rotating machines 110, 210, 310 Stator
120, 220, 320 First member 121, 221, 321 Yoke part 122 Outer peripheral surface 123 Inner peripheral surface 124 Groove 124a Bottom wall 124b, 124c Side wall 130, 230, 330, 430, 530, 630 Second member 140, 240 340, 440, 540, 640 tooth portions 150, 250, 350, 450, 550, 650 tooth base portions 151, 451, 551, 651 end walls 152, 153, 452, 453, 552, 553, 652, 653 side walls 160, 260, 360, 460, 560, 660 Teeth tip 161, 162, 461, 462, 561, 562, 661, 662 Outer wall 163, 463, 563, 663 Inner wall 170, 270, 370, 470, 570, 670 Connection Part 171, 471, 571, 671 First connection 172, 472, 572, 672 Second connection wall 172a, 472a, 571a, 572a, 672a Bottom wall 172b, 172c, 472b, 472c, 571b, 571c, 572b, 572c, 672b, 672c Side wall 180, 280, 380 190, 290, 390 Rotary axis

Claims (5)

A stator of a rotating machine configured by assembling a first member and a second member,
The first member has a yoke portion extending along a circumferential direction when viewed from a direction orthogonal to an axis center line passing through the axis center,
The second member is, when viewed from a direction perpendicular to the axis center line, connected to a tooth base extending along the radial direction and the shaft center side of the tooth base, and extending along the circumferential direction. A plurality of teeth formed by the teeth tips to be connected, and a plurality of connecting parts for connecting the teeth tips of the teeth adjacent to each other in the circumferential direction,
A first side wall and a second side wall that are arranged on one side and the other side along a circumferential direction with a center line of the tooth part passing through the axis center interposed therebetween and extend in a radial direction; An end wall disposed between ends of the first side wall and the second side wall opposite to the axis center and extending along a circumferential direction;
A first outer peripheral wall of the first side wall of the tooth base extending to the one side along a circumferential direction from an end on the axis center side, and a first outer peripheral wall of the tooth base; A second outer peripheral wall of the second side wall extending from the end on the axis center side to the other side along the circumferential direction; and a radial direction more than the first outer peripheral wall and the second outer peripheral wall. Having an inner peripheral wall that is arranged on the shaft center side and extends along a circumferential direction,
The connecting portion is disposed on the other side along the circumferential direction from the second outer peripheral wall of the tip end portion of the teeth disposed on the one side along the circumferential direction from the connecting portion and the connecting portion. A first connecting wall connecting the first outer peripheral wall of the tooth tip, and the inner peripheral wall of the tooth tip disposed on the one side along the circumferential direction from the connecting portion; A second connecting wall that connects the inner peripheral wall of the tooth tip portion disposed on the other side along the circumferential direction from the portion,
The first connecting wall extends in an arc shape that is recessed toward the axis center side along a radial direction,
The second connecting wall has the same curvature as the first connecting wall, and has an arc-shaped bottom wall that is recessed toward the axis center along the radial direction, and linearly extends. Forming a concave portion having a first side wall and a second side wall that are recessed in a direction opposite to the axial center along a radial direction;
A part of the tooth base opposite to the axis center is assembled to the yoke part,
Six teeth parts are provided,
The angle θ formed by the center line of the teeth portion and the extension direction of the first outer peripheral wall and the angle θ formed by the center line of the teeth portion and the extension direction of the second outer peripheral wall are [ 50 ° ≦ θ ≦ 60 °]. A stator of a rotating machine configured by assembling a first member and a second member,
The first member has a yoke portion extending along a circumferential direction when viewed from a direction orthogonal to an axis center line passing through the axis center,
The second member is, when viewed from a direction perpendicular to the axis center line, connected to a tooth base extending along the radial direction and the shaft center side of the tooth base, and extending along the circumferential direction. A plurality of teeth formed by the teeth tips to be connected, and a plurality of connecting parts for connecting the teeth tips of the teeth adjacent to each other in the circumferential direction,
A first side wall and a second side wall that are arranged on one side and the other side along a circumferential direction with a center line of the tooth part passing through the axis center interposed therebetween and extend in a radial direction; An end wall disposed between ends of the first side wall and the second side wall opposite to the axis center and extending along a circumferential direction;
A first outer peripheral wall of the first side wall of the tooth base extending to the one side along a circumferential direction from an end on the axis center side, and a first outer peripheral wall of the tooth base; A second outer peripheral wall of the second side wall extending from the end on the axis center side to the other side along the circumferential direction; and a radial direction more than the first outer peripheral wall and the second outer peripheral wall. Having an inner peripheral wall that is arranged on the shaft center side and extends along a circumferential direction,
The connecting portion is disposed on the other side along the circumferential direction from the second outer peripheral wall of the tip end portion of the teeth disposed on the one side along the circumferential direction from the connecting portion and the connecting portion. A first connecting wall connecting the first outer peripheral wall of the tooth tip, and the inner peripheral wall of the tooth tip disposed on the one side along the circumferential direction from the connecting portion; A second connecting wall that connects the inner peripheral wall of the tooth tip portion disposed on the other side along the circumferential direction from the portion,
The first connecting wall extends in an arc shape that is recessed toward the axis center side along a radial direction,
The second connecting wall has the same curvature as the first connecting wall, and has an arc-shaped bottom wall that is recessed toward the axis center along the radial direction, and linearly extends. Forming a concave portion having a first side wall and a second side wall that are recessed in a direction opposite to the axial center along a radial direction;
A part of the tooth base opposite to the axis center is assembled to the yoke part,
9 teeth parts are provided,
The angle θ formed by the center line of the teeth portion and the extension direction of the first outer peripheral wall and the angle θ formed by the center line of the teeth portion and the extension direction of the second outer peripheral wall are [ 50 ° ≦ θ ≦ 70 °]. A stator of a rotating machine configured by assembling a first member and a second member,
The first member has a yoke portion extending along a circumferential direction when viewed from a direction orthogonal to an axis center line passing through the axis center,
The second member is, when viewed from a direction perpendicular to the axis center line, connected to a tooth base extending along the radial direction and the shaft center side of the tooth base, and extending along the circumferential direction. A plurality of teeth formed by the teeth tips to be connected, and a plurality of connecting parts for connecting the teeth tips of the teeth adjacent to each other in the circumferential direction,
A first side wall and a second side wall that are arranged on one side and the other side along a circumferential direction with a center line of the tooth part passing through the axis center interposed therebetween and extend in a radial direction; An end wall disposed between ends of the first side wall and the second side wall opposite to the axis center and extending along a circumferential direction;
A first outer peripheral wall of the first side wall of the tooth base extending to the one side along a circumferential direction from an end on the axis center side, and a first outer peripheral wall of the tooth base; A second outer peripheral wall of the second side wall extending from the end on the axis center side to the other side along the circumferential direction; and a radial direction more than the first outer peripheral wall and the second outer peripheral wall. Having an inner peripheral wall that is arranged on the shaft center side and extends along a circumferential direction,
The connecting portion is disposed on the other side along the circumferential direction from the second outer peripheral wall of the tip end portion of the teeth disposed on the one side along the circumferential direction from the connecting portion and the connecting portion. A first connecting wall connecting the first outer peripheral wall of the tooth tip, and the inner peripheral wall of the tooth tip disposed on the one side along the circumferential direction from the connecting portion; A second connecting wall that connects the inner peripheral wall of the tooth tip portion disposed on the other side along the circumferential direction from the portion,
The first connecting wall extends in an arc shape that is recessed toward the axis center side along a radial direction,
The second connecting wall has the same curvature as the first connecting wall, and has an arc-shaped bottom wall that is recessed toward the axis center along the radial direction, and linearly extends. Forming a concave portion having a first side wall and a second side wall that are recessed in a direction opposite to the axial center along a radial direction;
A part of the tooth base opposite to the axis center is assembled to the yoke part,
Twelve teeth parts are provided,
The angle θ formed by the center line of the teeth portion and the extension direction of the first outer peripheral wall and the angle θ formed by the center line of the teeth portion and the extension direction of the second outer peripheral wall are [ 45 ° ≦ θ ≦ 75 °]. A rotating machine including a stator and a rotor rotatably arranged with respect to the stator, wherein the stator according to any one of claims 1 to 3 is used as the stator. A rotating machine characterized by the following. The rotating machine according to claim 4 , wherein
When the gap between the stator and the rotor is G,
The depth D along the radial direction of the second connecting wall satisfies [D ≧ 0.5G], and the length L along the circumferential direction of the second connecting wall is [L ≧ 2G]. A rotating machine characterized by satisfying the following.

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