JP2018038209A - Stator of rotary electric machine and rotary electric machine including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator for a rotary electric machine with a high space factor coil that improves a space factor inside a stator slot while reducing the number of components by reducing the types of arrangement of coils wound around a stator core, and a rotary electric machine including the same.SOLUTION: A stator 120 of a rotary electric machine 100 includes a stator coil 105 in an intensive winding method formed by winding a coil around one tooth 103 of a stator core 101. The stator coil 105 has a cross-sectional shape in which a coil is aligned and wound along a radius direction with a rotation axis of the rotary electric machine 100 as the center to form a plurality of stages, and the arrangement of one or more winding of a coil on a winding start side and that on a winding end side of a stage closest to the adjacent teeth 103 are arranged asymmetrically on the left and right sides at an interval.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a stator of a rotating electric machine such as a motor or a generator, and a rotating electric machine including the same.

  As a background art in this technical field, there is JP 2000-14066 A (Patent Document 1). According to this publication, “each coil has a shape that fills the gap between the teeth formed by the adjacent coils, so that the space factor of the coil wire can be increased, thereby improving the motor performance. Can be planned ”(see summary).

JP 2000-14066 A

  A motor of a rotating electrical machine or a stator of a generator has a structure in which a plurality of teeth of a cylindrical stator core are arranged and a coil is wound in a slot which is a space portion generated between the teeth. Conventionally, a position for preventing coil interference between adjacent slots while effectively using a winding cross-sectional area as shown in Patent Document 1 in order to improve a space factor, which is a ratio of a coil in a stator slot. The windings are arranged so as to be shifted. However, in this method, coil winding positions on the outermost layer wound around adjacent teeth are alternately arranged, and there are two types of magnetic teeth that are symmetrical coil winding positions when viewed from the cross-sectional shape of the winding. This is necessary and the number of parts increases.

  The present invention proposes a coil arrangement that replaces the conventional technique as described above, and provides a stator of a rotating electrical machine having a reduced number of parts and a high space factor winding, and a rotating electrical machine including the stator. And

  The present invention includes a plurality of means for solving the above-mentioned problems. For example, the present invention has a concentrated winding type stator coil formed by intensively winding one tooth of a stator core. A stator for a rotating electrical machine, wherein the stator coil has a cross-sectional shape in which a plurality of stages are formed by aligning and winding windings along a radial direction centered on a rotating shaft of the rotating electrical machine. And a coil arrangement of one or more turns on the winding start side and the winding end side of the step closest to the adjacent teeth is configured to be arranged asymmetrically spaced in the left-right direction. Stator. "

  According to the present invention, the rotation of the high space factor winding that improves the space factor in the stator slot while reducing the number of parts by reducing the type of coil arrangement wound around the stator core. An electric motor stator and a rotating electric machine including the same can be provided. Further features related to the present invention will become apparent from the description of the present specification and the accompanying drawings. Further, problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

The schematic diagram which shows the whole structure of the rotary electric machine which concerns on embodiment of this invention. Sectional drawing in the plane orthogonal to the axial direction of a stator. Sectional drawing which showed coil arrangement | positioning of Example 1. FIG. Sectional drawing which showed coil arrangement | positioning of Example 2. FIG. Sectional drawing which showed coil arrangement | positioning of Example 3. FIG. Sectional drawing which showed coil arrangement | positioning of Example 4. FIG. Sectional drawing which showed coil arrangement | positioning of the comparative example.

Examples of the present invention will be described below.
In the following description, a rotary electric machine for a hybrid electric vehicle is used as an example of the rotary electric machine. In the following description, “axial direction” refers to a direction along the rotation axis of the rotating electrical machine. The circumferential direction refers to the direction along the rotational direction of the rotating electrical machine. The “radial direction” refers to a radial direction (radial direction) when the rotational axis of the rotating electrical machine is the center. “Inner circumference side” refers to the radially inner side (inner diameter side), and “outer circumference side” refers to the opposite direction, that is, the radially outer side (outer diameter side).

[Example 1]
First, the outline | summary of Example 1 is demonstrated.
The first embodiment described here relates to a coil arrangement structure of a stator of a rotating electrical machine. The rotating electrical machine is roughly divided into a cylindrical stator and a rotor arranged at a predetermined gap on the inner peripheral side of the stator.

  The stator has a plurality of magnetic poles arranged so that the polarities are alternately different in the rotation direction, and has a cylindrical stator core and a plurality of stator coils wound around the stator core And have. The stator core has teeth around which a stator coil is wound. Between the adjacent teeth, a plurality of stator cores penetrating in the axial direction and arranged in the circumferential direction are accommodated. Slots are formed. Each stator coil is wound a plurality of times so that the teeth form a magnetic pole. One of the stator coils is electrically connected to a connection wire that forms a neutral wire and the other is a U, V, and W three-phase wire. It is configured by connecting them together.

  In this embodiment, the stator coil wound around one tooth is arranged to be asymmetrical so as to avoid interference between adjacent coils and to make a winding with a high space factor. I can do it.

Next, examples will be described in detail with reference to the drawings.
FIG. 1 is a schematic diagram showing an overall configuration of a rotating electrical machine according to an embodiment of the present invention. In FIG. 1, the inside of the rotating electrical machine 100 is shown by making a part of the rotating electrical machine 100 into a cross section. As shown in FIG. 1, the rotating electrical machine 100 is disposed inside a case 110, and is disposed rotatably within the housing 102, the stator 120 fixed to the housing 102, and the stator 120. And a rotor 130. The case 110 includes an engine case and a transmission case.

  The rotating electrical machine 100 is a three-phase synchronous motor with a built-in permanent magnet. The rotating electrical machine 100 operates as an electric motor that rotates the rotor 130 by supplying a three-phase alternating current to the stator coil 105 of the stator 120. Further, when the rotating electrical machine 100 is driven by an engine, it operates as a generator and outputs three-phase AC generated power. That is, the rotating electrical machine 100 has both a function as an electric motor that generates rotational torque based on electric energy and a function as a generator that generates electric power based on mechanical energy. Functions can be used selectively.

  The stator 120 is fixed to the housing 102. The stator 120 is fixedly held in the case 110 by fastening a flange 115 provided on the housing 102 to the case 110 with a bolt 113. The rotor 130 fixed to the shaft 131 is supported by bearings 111 and 112 of the case 110 and is rotatably held inside the stator 120. The rotor 130 has a known configuration, and a detailed description of the configuration is omitted.

FIG. 2 is a cross-sectional view taken along a plane orthogonal to the axial direction of the stator of the rotating electrical machine according to the present embodiment.
The stator 120 has a stator core 101 and a stator coil 105. The stator core 101 is divided into a plurality of parts in the circumferential direction, and the outer circumference in the radial direction is held by a substantially cylindrical housing 102 and is held in a substantially cylindrical shape. In this embodiment, the stator core 101 is divided. However, the stator core 101 may be integrated without being divided and held by the substantially cylindrical housing 102.

  Stator core 101 has teeth 103 arranged at regular intervals in a comb shape so as to protrude radially inward. A slot 104 is formed between adjacent teeth 103, and a stator coil 105 and an insulating member 106 are inserted therein. The stator coil 105 is a concentrated winding method in which a winding is wound around a single tooth 103 in a concentrated manner a plurality of times.

  FIG. 3 is a cross-sectional view showing a coil arrangement of Example 1, and FIG. 7 is a cross-sectional view showing a coil arrangement of a comparative example. The cross-sectional views shown in FIG. 3 and FIG. 7 are views showing a cross section in which two stator coils 105 wound around a stator core 101 are arranged adjacent to each other and cut along a plane orthogonal to the axial direction. And the number shown in the winding of the stator coil 105 in the figure indicates the number of coil turns (the number of turns of the winding).

  The stator coil 105 is formed by winding around the teeth 103 from the winding start side of the stator core 101 (one side in the circumferential direction of the stator 120). Stator coil 105 has a cross-sectional shape in which a plurality of stages are formed by aligning and winding windings along a radial direction when the rotation axis of rotating electrical machine 100 is the center.

  In order to prevent interference with the adjacent stator coil 105, the stator coil 105 is a coil winding position that is asymmetrical when viewed in the cross-sectional shape of the winding. That is, in the stator coil 105, the cross-sectional shape on one side and the cross-sectional shape on the other side of the rotating electrical machine 100 around the teeth 103 are asymmetric.

  In the present embodiment, the coil arrangement for two turns on the winding start side and the winding end side of the step closest to the adjacent teeth 103 is arranged with a left-right asymmetric spacing. Accordingly, the stator coil 105 is provided with an interference prevention space 109 by arranging the winding interval in two rows separated in the column direction at least on one side and the other side of the rotating electrical machine 100 in the rotational direction.

  The stator coil 105 is wound in a row aligned in a line from the radially outer side of the stator core 101 toward the radially inner side, and arranged in a line from the radially inner side of the stator core 101 to the radially outer side. And one or more B stages wound in alignment with each other. An interference prevention space 109 is formed in at least one of the A stage and the B stage. When there are a plurality of A stages and B stages, an interference prevention space 109 is formed in at least one of the plurality of A stages and B stages.

  In this embodiment, as indicated by a path F in FIG. 3, the stator coils 105 are wound so as to be aligned in a line at equal intervals from the radially outer side to the radially inner side of the stator core 101 ( A stage). And it goes up by the front-end | tip part of the teeth 103, and is wound in 1 row so that it may arrange at equal intervals toward the radial direction outer side from the radial direction inner side of the stator core 101 (B stage). The A stage and the B stage are wound so as to be repeated over a plurality of stages. In this embodiment, an example in which the number of stages is 5 and the number of coil turns is 43 turns (43 laps) is shown. An interference prevention space 109 is formed at the B stage.

Hereinafter, a more specific configuration of the stator coil 105 will be described.
First, the first stage of the stator coil 105 is wound up to the 11th turn so as to be arranged in a line at equal intervals from the radially outer side to the radially inner side. And at the 12th turn, it goes up to the second stage. The second stage is wound up to the 22nd turn so that the outer side of the first stage is arranged in a line at equal intervals from the radially inner side to the radially outer side. After winding the 22nd turn, which is the final turn of the 2nd stage, the stage goes up to the 3rd stage at the 23rd turn. The third stage is wound up to the 33rd turn so that the outer side of the second stage is arranged in a line at equal intervals from the radially outer side to the radially inner side.

  The 4th stage, which is the B stage, starts from the 34th turn, but the arrangement of the 34th turn is asymmetrical between the winding start side and the winding end side in order to prevent interference with the stator coil 105 wound around the adjacent teeth 103. And Specifically, the position of the winding start side of the 34th turn is set to the 3rd stage by the winding part 107 that winds from the winding end side of the 3rd turn of the 33rd turn to the winding start side of the 4th stage 34th turn. Place on the 32nd and 33rd turn of the eyes.

  Then, the position of the winding end side of the 34th turn is set above the 30th and 31st turns of the 34th turn by the winding part 108 that winds from the winding start side to the winding end side of the 34th turn of the 4th stage. To place. Thereby, the coil arrangement | positioning for two turns of the winding start side of the 4th step | paragraph nearest to the adjacent teeth 103, and a winding end side is arrange | positioned by providing the space | interval asymmetrically.

  The winding start side and winding end side of the 35th turn are both arranged on the 29th and 30th turns. Then, from the 36th turn to the 41st turn in the fourth stage, the wires are wound so as to be arranged in a line at equal intervals from the radially inner side to the radially outer side. The fifth stage rises at the 42nd turn, and is wound so that the 42nd turn and the 43rd turn are aligned from the radially outer side toward the radially inner side. Therefore, as shown in FIG. 3, the stator coil 105 has an asymmetric cross section on one side and a cross section on the other side of the rotating electrical machine 100 around the teeth 103.

  According to this embodiment, the arrangement of the 34th turn is asymmetrical between the winding start side and the winding end side, and on the 4th winding start side, between the 34th turn and the 35th turn, one turn or more. An interference prevention space 109 having an interval of is provided. In the present embodiment, the interference prevention space 109 has an interval of two turns between the 34th turn and the 35th turn. This interference prevention space 109 can prevent interference with the adjacent stator coil 105, and can be placed on the 35th turn and the 29th turn.

  For example, in FIG. 3, when the position of the winding start side of the 34th turn is arranged on the 30th turn and the 31st turn as in the case of the winding end side of the 34th turn, the adjacent stator coil 105 An appropriate gap cannot be ensured between the winding end side of the 34th turn and there is a possibility of interfering with each other. Therefore, the position on the winding start side of the 34th turn cannot be placed above the 30th and 31st turns. As a result, as in the comparative example shown in FIG. 7, the position of the 34th turn must be placed above the 29th and 30th turns, and the total number of turns of the stator coil 105 becomes 42 turns. The space factor cannot be improved.

  On the other hand, in the present embodiment, the arrangement of the 34th turn is asymmetrical between the winding start side and the winding end side, and on the 4th winding start side, there are 2 windings between the 34th turn and the 35th turn. Since the interference prevention space 109 having a minute interval is provided, interference with the adjacent stator coil 105 can be prevented, and the 35th turn can be arranged above the 29th and 30th turns, and the fixed The total number of turns of the child coil 105 is 43 turns, and the coil space factor can be improved.

  According to the present embodiment, since the plurality of stator coils 105 all have the same shape, it is not necessary to provide teeth having different shapes as in Patent Document 1, and the number of parts does not increase.

  As in the present embodiment, the stator coil 105 wound around one tooth 103 is arranged to be asymmetrical in the left-right direction, thereby avoiding interference with the adjacent stator coil 105 and having a high space factor. The stator of the rotating electrical machine and the rotating electrical machine including the stator can be provided.

[Example 2]
Next, a second embodiment of the present invention will be described. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

FIG. 4 is a cross-sectional view showing the coil arrangement of the second embodiment.
What is characteristic in this embodiment is that an interference prevention space 109 having an interval of one turn is provided between the 34th turn and the 35th turn. As a result, the stator coil 105 has a coil arrangement for one turn on the winding start side and the winding end side in the fourth stage closest to the adjacent teeth 103 arranged in a laterally asymmetric manner.

  In the fourth stage, the position on the winding start side of the 34th turn is set to the third stage by the winding part 107 which winds from the winding end side of the third turn 33 of the third stage to the winding start side of the 34th turn of the fourth stage. Place on the 32nd and 33rd turn of the eyes. Then, the position of the winding end side of the 34th turn is set above the 31st turn and the 32nd turn of the 34th turn by the winding part 108 that winds from the winding start side to the winding end side of the 34th turn of the fourth stage. To place.

  The winding start side and winding end side of the 35th turn are both arranged on the 30th and 31st turns. From the 36th turn to the 42nd turn in the fourth stage, the wires are wound so as to be arranged in a line at equal intervals from the radially inner side to the radially outer side. The fifth stage rises at the 43rd turn and is wound so that the 43rd turn and the 44th turn are aligned from the radially outer side toward the radially inner side.

  In the present embodiment, the interference prevention space 109 has an interval of one turn between the 34th turn and the 35th turn. The interference prevention space 109 can prevent interference with the adjacent stator coil 105, and the 35th turn can be arranged above the 30th and 31st turns of the third stage. Therefore, the total number of turns of the stator coil 105 can be set to 44 turns, the number of turns can be increased as compared with the configuration of the first embodiment, and the coil space factor can be further improved. In addition, the configuration having an interval of one turn is easier to control when winding than the configuration having an interval of two turns in the first embodiment, and simplification of manufacturing can be achieved.

[Example 3]
Next, Embodiment 3 of the present invention will be described. The same components as those in the first and second embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

FIG. 5 is a cross-sectional view showing the coil arrangement of the third embodiment.
What is characteristic in this embodiment is that an interference prevention space 109 having an interval of one turn is provided between the 43rd turn and the 44th turn on the winding end side of the fifth stage, which is the A stage. It is.
Since the configuration up to the third level is the same as in the first and second embodiments, the description is omitted. In the fourth stage, 34 turns are arranged above the 30th and 31st turns of the third stage on both the winding start side and the winding end side. The fourth stage is wound up to the 41st turn so that the outer side of the third stage is arranged in a line at equal intervals from the radially inner side to the radially outer side. After winding the 41st turn, which is the final turn of the 4th stage, the stage goes up to the 5th stage at the 42nd turn. The fifth stage is wound up to the 44th turn so that the outer side of the fourth stage is arranged in a line from the radially outer side to the radially inner side.

  In the fifth stage, in order to prevent interference with the stator coil 105 wound around the adjacent teeth 103, the arrangement of the 44th turn is asymmetrical between the winding start side and the winding end side. Specifically, the position of the winding end side of the 44th turn is set to the 38th turn and 39th turn of the 44th turn by the winding part 108 that winds from the winding start side to the winding end side of the 44th turn of the fifth stage. Place on the eyes.

  According to the present embodiment, the arrangement of the 44th turn is asymmetrical on the winding start side and the winding end side, and on the fifth stage winding end side, between the 43rd turn and the 44th turn, one turn An interference prevention space 109 having an interval is provided. The interference prevention space 109 can prevent interference with the adjacent stator coil 105, and can provide the 44th turn.

  In this embodiment, the arrangement of the 44th turn is asymmetrical between the winding start side and the winding end side, and there is an interval of one turn between the 43rd turn and the 44th turn on the fifth stage winding end side. Since the interference prevention space 109 is provided, interference with the adjacent stator coil 105 can be prevented and the 44th turn can be provided, the total number of turns of the stator coil 105 is 44 turns, and the coil space factor is Further improvement can be achieved.

[Example 4]
Next, a fourth embodiment of the present invention will be described. Note that the same components as those in the above-described embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

FIG. 6 is a cross-sectional view showing the coil arrangement of the third embodiment.
The present embodiment is a combination of the configuration of the second embodiment and the configuration of the third embodiment, and the interference prevention spaces 109A and 109B are provided in the fourth stage that is the B stage and the fifth stage that is the A stage.

  In the fourth stage, the position of the winding start side of the 34th turn is changed to the third stage by the winding part 107A that winds from the winding end side of the 33rd turn of the third stage to the winding start side of the 34th turn of the fourth stage. Place on the 32nd and 33rd turn of the eyes. Then, the position of the winding end side of the 34th turn is set above the 31st turn and the 32nd turn of the 34th turn by the winding part 108A which winds from the winding start side of the 34th turn of the 4th stage to the winding end side. To place.

  The winding start side and winding end side of the 35th turn are both arranged on the 30th and 31st turns. From the 36th turn to the 42nd turn in the fourth stage, the wires are wound so as to be arranged in a line at equal intervals from the radially inner side to the radially outer side.

  The fifth stage is wound up to the 45th turn so that the outer side of the fourth stage is arranged in a line from the radially outer side to the radially inner side. In the fifth stage, in order to prevent interference with the stator coil 105 wound around the adjacent teeth 103, the arrangement of the 45th turn is asymmetric between the winding start side and the winding end side. Specifically, the position of the winding end side of the 45th turn is set to the 39th turn and the 40th turn of the 45th turn by the winding part 107B that winds from the winding start side to the winding end side of the 45th turn of the fifth stage. Place on the eyes.

  According to the present embodiment, the arrangement of the 34th turn and the 44th turn is asymmetrical at the winding start side and the winding end side, and the fourth stage (B stage) winding start side and the fifth stage (A stage) winding. On the end side (both one side and the other side in the rotation direction of the rotating electrical machine 100), interference prevention spaces 109A and 109B each having an interval of one turn are provided. The interference prevention spaces 109A and 109B can prevent interference with the adjacent stator coil 105, and can provide a 45th turn.

  In the present embodiment, the arrangement of the 34th turn and the 44th turn is asymmetrical at the winding start side and the winding end side, and an interval of one turn is set at each of the fourth winding start side and the fifth winding end side. Since the interference prevention spaces 109A and 109B are provided, interference with the adjacent stator coil 105 can be prevented, the 45th turn can be provided, the total number of turns of the stator coil 105 is 45 turns, The product factor can be further improved.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. In addition, it is possible to add, delete, and replace other configurations for a part of the configuration of the embodiment.

DESCRIPTION OF SYMBOLS 100: Rotating electrical machine 101: Stator core 102: Housing 103: Teeth 104: Slot 105: Stator coil 106: Insulating member 107: Rolling part 108: Rolling part 109: Interference prevention space 120: Stator

Claims (6)

A stator of a rotating electric machine having a concentrated winding type stator coil configured by intensively winding around one tooth of a stator core,
The stator coil has a cross-sectional shape that forms a plurality of steps by aligning windings along a radial direction when the rotation axis of the rotating electrical machine is the center.
A stator for a rotating electrical machine, wherein a coil arrangement of one or more turns on the winding start side and the winding end side of the step closest to the adjacent teeth is arranged asymmetrically spaced from each other .   The stator coil is configured to dispose a coil arrangement of two windings on the winding start side and the winding end side of the step closest to the adjacent teeth with a left-right asymmetric spacing. The stator of the rotary electric machine according to claim 1.   The stator of a rotating electrical machine according to claim 2, wherein the stator coil has an asymmetric cross-sectional shape on one side and a cross-sectional shape on the other side in the rotational direction of the rotating electrical machine with the teeth as a center. .   The stator coil is arranged such that at least one of the rotating machine on one side and the other side of the rotating electric machine is disposed with a winding interval one or more turns away in the column direction to form an interference prevention space. The stator for a rotating electrical machine according to claim 3. The stator coils are A-stages wound in a line from the radially outer side to the radially inner side, and B-stages wound in a line from the radially inner side to the radially outer side. And having
The stator for a rotating electrical machine according to claim 4, wherein the interference prevention space is formed in at least one of the A stage and the B stage.   A rotating electrical machine comprising the stator according to any one of claims 1 to 5.

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