JP2005102477A - Stator winding and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator winding and its manufacturing method capable of improving the occupying percentage of the stator winding. <P>SOLUTION: The stator winding 5 is provided with a plurality of eddy coil portions 5<SB>1</SB>, ..., 5<SB>n</SB>to be constituted. The eddy coil portions 5<SB>1</SB>, ..., 5<SB>n</SB>are formed by winding flat-type wires 5a in an eddy condition so as to form a plurality of layers in a thickness direction of teeth, and the plurality of eddy coils 5<SB>1</SB>, ..., 5<SB>n</SB>are laid so as to form a plurality of rows in a radial direction of the stator core using respective center axes as coaxis. In the adjacent eddy coils 5<SB>k</SB>, ..., 5<SB>(K+1)</SB>(1≤k≤n-1), inner periphery edges or outer periphery side edges of one or the other eddy coils 5<SB>k</SB>, 5<SB>(K+1)</SB>are connected with each other. The inner periphery side connection portion in which the inner periphery side edges are connected with each other for the eddy coils 5<SB>k</SB>, 5<SB>(K+1)</SB>, and the outer periphery side connection in which the outer periphery side edges are connected with each other are formed so as to be a row change portion so that the rows of the flat-type wires 5a may change. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a stator winding provided in a stator of a motor and a method for manufacturing the stator winding.

Conventionally, for example, when forming a stator winding by winding a so-called round wire having a circular cross section around a stator tooth in multiple rows and multiple layers, a gap is generated between the outer peripheral surfaces of adjacent round wires, There is a problem that the space factor (that is, the ratio of the area occupied by the cross section of the stator winding to the cross section of the slot formed between adjacent teeth) cannot be improved. In order to solve such a problem, for example, a stator is known in which a space factor of a stator winding is relatively improved by winding a so-called rectangular wire having a substantially rectangular cross section around a tooth (for example, Patent Documents). 1 or Patent Document 2).
Here, the rectangular wire having a substantially rectangular cross section is formed so that the thickness is smaller than the width, for example, the width direction of the flat wire is the row direction of the stator winding, and the thickness direction of the flat wire is the stator direction. It is set in the layer direction of the winding. That is, when winding a rectangular wire around a tooth, a plurality of rectangular wires are arranged by setting the width direction of the rectangular wire to the direction in which the teeth extend, that is, the radial direction of the stator, for each turn of the rectangular wire around the teeth. Thus, a plurality of rows are formed, and the thickness direction of the flat wire is set to the thickness direction of the teeth (for example, the radial direction in the case of a cylindrical tooth), and a plurality of flat wires are stacked to form a plurality of layers.
JP 2000-197294 A JP 2000-245092 A

By the way, in the stator winding manufacturing method according to the above-described prior art, when winding a rectangular wire around a tooth, a plurality of permutations are repeated for each of a plurality of layers. That is, first, the first layer of the stator winding is formed by repeating the replacement every time the rectangular wire circulates around the teeth and sequentially arranging the rectangular wires toward one side in the column direction (that is, the radial direction of the stator). (Step ST01). Then, in the circulation at one end in the column direction of the first layer, the rectangular wire is laminated by one layer in the layer direction (that is, the thickness direction of the teeth), and the layer is changed from the first layer to the second layer. Further, in the second layer, the rearrangement is repeated for each turn, and the rectangular wires are sequentially arranged toward the other side in the column direction (step ST02). Then, in the circulation at the other end in the column direction of the second layer, the layer is changed from the second layer to the third layer (step ST03). Hereinafter, in the third and subsequent layers, the above-described steps ST01 to ST01 are performed. The process of step ST03 is repeated. That is, for example, when a stator winding is formed by winding a rectangular wire in a plurality of rows L and a plurality of layers C (where L and C are arbitrary natural numbers), a total of (L-1) × C rows The change and the total (C-1) stratification will be executed. Then, when layering is performed on the rotating rectangular wire, for example, the rectangular wire is twisted and deformed by bending it in the thickness direction at an appropriate position, or the rectangular wire is wound around in a spiral shape, for example. In addition, when performing the rearrangement, for example, the rectangular wire is twisted and deformed by bending it in the width direction at an appropriate position, or, for example, the rectangular wire is gradually wound around in a spiral shape. Will be replaced.
However, according to the stator winding manufacturing method as described above, for example, since the flat wire is formed so as to have a width larger than the thickness, the number of times of replacement executed in the width direction is performed. When the length increases, for example, the winding length per unit turn increases excessively with the bending in the width direction of the rectangular wire or the spiral turn, causing a problem that the resistance value increases excessively. In addition, when the flat wire is bent in the width direction, for example, compared with the case where the flat wire is bent in the thickness direction, the amount of deformation of the flat wire around the bent portion accompanying bending is larger. On the other hand, when other rectangular wires are adjacent to each other in the column direction or the layer direction, a gap (so-called rectangular wire floating) may be generated between adjacent rectangular wires, and the width of the rectangular wire is aligned. When the number of executions of rearrangement increases, the amount of deformation of the rectangular wire is excessively accumulated, resulting in a problem that the space factor decreases. In addition, at the end in the row direction of the stator winding, for example, if layer change and row change are performed at the same position in the circumferential direction of the rotating rectangular wire, the amount of deformation of the rectangular wire around these positions is excessive. This causes a problem that the space factor is further reduced.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a stator winding and a method for manufacturing the stator winding that can improve the space factor of the stator winding.

In order to solve the above problems and achieve the object, the stator winding according to the first aspect of the present invention has a plurality of rectangular wires for each of a plurality of teeth arranged at predetermined intervals in the circumferential direction of the stator. Stator windings wound in a concentrated manner in a plurality of layers and in a plurality of layers, and each of the plurality of rows along the radial direction of the stator is spirally formed so that the rectangular wire forms the plurality of layers. A wound spiral coil portion (vortex coil portions 5 ₁ ,..., 5 _{n in} the embodiment described later) is provided, and a plurality of the spiral coil portions are arranged along the radial direction of the stator so as to form the plurality of rows. It is characterized by being arranged.

  According to the stator winding having the above-described configuration, for example, the rectangular wire can be replaced with the adjacent row only in the connecting portion that connects the spiral coil portions adjacent in the column direction. For example, the rectangular wire has a plurality of rows and a plurality of layers. It is possible to prevent the replacement portion from being formed in each layer of the stator winding wound around the wire. This prevents the cumulative amount of deformation of the rectangular wire that increases with the number of replacements of the rectangular wire and the winding length per unit turn from excessively increasing, and the stator winding space factor. And an increase in winding resistance per unit turn of the rectangular wire can be suppressed.

  Furthermore, in the stator winding according to the second aspect of the present invention, the spiral coil portions adjacent to each other in the radial direction of the stator are the inner peripheral side ends of one and the other spiral coil portions, or one of the spiral coil portions. And the outer peripheral side edge parts of the other said spiral coil part are connected, It is characterized by the above-mentioned.

  According to the stator winding having the above-described configuration, for example, when one and the other two spiral coils are arranged so as to sandwich the spiral coils in an appropriate row in the row direction along the radial direction of the stator from both sides in the row direction. The inner circumferential ends of the appropriate spiral coil and one spiral coil, the outer ends of the appropriate spiral coil and the other spiral coil, or the appropriate spiral coil The outer peripheral end portions of one spiral coil and the inner peripheral end portions of the appropriate spiral coil and the other spiral coil are connected to each other. Thereby, the length of the connection part of the spiral coil parts adjacent in the column direction, that is, the replacement part where the flat wire is replaced by the adjacent line can be shortened.

Furthermore, in the stator winding according to the third aspect of the present invention, the stator winding of a plurality of phases includes a plurality of phase windings connected in parallel for each phase (for example, in the embodiment described later). 1st to 3rd U-phase windings U ₁ , U ₂ , U ₃ , 1st to 3rd V-phase windings V ₁ , V ₂ , V ₃ , 1st to 3rd W-phase windings W ₁ , W ₂ , W 3 ₃ ), and each of the plurality of phase windings is provided with a plurality of teeth (for example, first to ninth salient pole portions T1,..., T9 in embodiments described later) For example, windings U _i (T1), U _i (T4), U _i (T7), and i are 1 ≦ i ≦ 3) are connected in series in the embodiments to be described later. The plurality of spiral coil portions are arranged along the radial direction of the stator so as to form the plurality of rows.

According to the stator winding configured as described above, a plurality of winding portions in parallel relation are provided for each of the plurality of teeth, and appropriate winding portions provided in each tooth are connected in series between the plurality of teeth. As a result, the current values of the energization currents in the plurality of tooth portions become equal to each other, for example, in a state where the total number of turns of the rectangular wire for each tooth is set to a predetermined value, a single value for each of the plurality of teeth. Compared to the case where concentrated winding coils with concentrated rectangular wires are connected in parallel for each phase, the temperature rise due to resistance heating of the rectangular wires for each tooth will vary excessively between multiple teeth. Can be prevented.
Moreover, for example, in the case where the total number of turns of the rectangular wire for each tooth is set to a predetermined value, concentrated winding coils in which a single rectangular wire is concentratedly wound for each of a plurality of teeth are connected in series for each phase. As compared with the above, the total resistance value of the stator winding can be reduced. As a result, the amount of energization required to generate the desired torque can be reduced, the motor can be operated efficiently, and the cross-sectional area of the rectangular wire can be reduced.

  Furthermore, in the stator winding of the present invention according to claim 4, the number of turns of the rectangular wire of each of the winding portions is equal to the impedance of the plurality of phase windings, and for each of the plurality of teeth. The combined impedance of the plurality of teeth is set to be equal to the combined impedance obtained by combining the impedances of the plurality of winding portions provided in each of the plurality of phase windings. The number of turns of each of the plurality of winding sections is set to a value different from each other.

  According to the stator winding having the above-described configuration, when the impedances of the plurality of phase windings are set to be equal, a return current that circulates between the plurality of phase windings of the same phase is generated. It is possible to prevent occurrence of excessive torque fluctuation by setting the combined impedances of the plurality of teeth to be equal to each other.

According to a fifth aspect of the present invention, there is provided a stator winding manufacturing method in which rectangular wires are concentratedly wound in a plurality of rows and a plurality of layers for each of a plurality of teeth arranged at predetermined intervals in the circumferential direction of the stator. A method of manufacturing a stator winding to be rotated, wherein the rectangular wire is spirally wound so as to form the plurality of layers for each of the plurality of rows along the radial direction of the stator. spiral coil unit 5 ₁ in the embodiments to be described _later, ..., 5 _n) is formed, as characterized by sequence along a plurality of the spiral coil portion in a radial direction of the stator so as to form the plurality of rows Yes.

  According to the above-described stator winding manufacturing method, for example, a rectangular wire can be replaced by an adjacent row only at a connection portion where adjacent spiral coil portions are connected in the column direction. In addition, it is possible to prevent the need for replacement in each layer of the stator winding when winding on a plurality of layers. This prevents the cumulative amount of deformation of the rectangular wire that increases with the number of replacements of the rectangular wire and the winding length per unit turn from excessively increasing, and the stator winding space factor. And an increase in winding resistance per unit turn of the rectangular wire can be suppressed.

Furthermore, the control device according to the sixth aspect of the present invention is configured so that a single rectangular wire is wound around a single rectangular wire in an appropriate row of the plurality of rows to form a first spiral coil section (second embodiment in an embodiment described later). And the fourth and sixth spiral coil portions 5 ₂ , 5 ₄ , 5 ₆ ), and the single flat angle connected to the outermost layer of the first spiral coil portion in a row adjacent to the appropriate row. A wire is wound in the same direction as the first spiral coil portion to form a second spiral coil portion (third, fifth and seventh spiral coil portions 5 ₃ , 5 ₅ , 5 in the embodiments described later). ₇ ), the spiral coil portions adjacent in the radial direction of the stator are formed, or a single rectangular wire is internally wound in an appropriate row of the plurality of rows to form a first spiral shape. Coil portion (first, third and fifth in the embodiments described later) Spiral coil unit 5 _1, 5 3, _{5 5)} to form said single said flat wire to said first spiral leading to the innermost layer of said first spiral coil portion in the column adjacent to the appropriate column Forming a second spiral coil part (second, fourth and sixth spiral coil parts 5 ₂ , 5 ₄ , 5 _{6 in} the embodiments described later) by winding the coil part around the same direction as the coil part Thus, the spiral coil portions adjacent in the radial direction of the stator are formed.

According to the above stator winding manufacturing method, for example, an outer winding process, a replacement process in the outermost layer, and an inner winding process are sequentially performed on a single rectangular wire. Alternatively, by sequentially performing the inner winding process, the rearrangement process in the innermost layer, and the outer winding process, they are adjacent to each other in the column direction, and the outer peripheral side ends or the inner peripheral side ends. Two first and second spiral coil portions made of a single rectangular wire connected to each other can be formed.
Further, for a single rectangular wire, for example, a sequence of sequentially executing an outer winding process, an outermost layer replacement process, an inner winding process, and an innermost layer replacement process. By repeating this process, a plurality of layers and a plurality of rows of stator windings can be formed.
This prevents the cumulative amount of deformation of the rectangular wire that increases with the number of replacements of the rectangular wire and the winding length per unit turn from excessively increasing, and the stator winding space factor. And an increase in winding resistance per unit turn of the rectangular wire can be suppressed.
Moreover, by forming the two first and second spiral coil portions adjacent to each other by a single rectangular wire, for example, the two adjacent first and second spiral coil portions are connected by welding or the like. It is possible to prevent time and effort.

Furthermore, the control device of the present invention according to claim 7 is configured such that the first rectangular wire is externally wound in an appropriate row of the plurality of rows to form a first spiral coil portion (second embodiment in an embodiment described later). And fourth and sixth spiral coil portions 5 ₂ , 5 ₄ , 5 ₆ ), and the second rectangular wire is rotated in the direction opposite to the first spiral coil portion in a row adjacent to the appropriate row. A second spiral coil portion (third, fifth, and seventh spiral coil portions 5 ₃ , 5 ₅ , 5 _{7 in} the embodiments described later) is formed by external winding, and the first spiral coil portion And the end portions on the outer peripheral side of the second spiral coil portion (end portion 5a _1B and end portion 5a _2A , end portion 5a _2B and end portion 5a _3A , end portion 5a _3B and end portion 5a in the embodiments described later) by connecting _4A), the spiral coil unit adjacent in the radial direction of the stator A first spiral coil portion is formed by winding the first rectangular wire in an appropriate row of the plurality of rows to form a first spiral coil portion, and a second flat angle in a row adjacent to the appropriate row A wire is wound inwardly in the direction opposite to the first spiral coil portion to form a second spiral coil portion, and inner end portions of the first spiral coil portion and the second spiral coil portion are connected to each other. By connecting, the spiral coil portions adjacent in the radial direction of the stator are formed.

According to the above-described stator winding manufacturing method, for example, two rectangular wires are externally wound in different circumferential directions to form first and second spiral coil portions, and the outer peripheral side ends are welded to each other. Or by connecting two rectangular wires in the circumferential direction different from each other to form first and second spiral coil portions and connecting the inner peripheral side ends of each other by welding or the like, Two first and second spiral coil portions that are adjacent to each other in the column direction and are connected to each other between the outer peripheral side ends or the inner peripheral side ends can be formed.
This prevents the cumulative amount of deformation of the rectangular wire that increases with the number of replacements of the rectangular wire and the winding length per unit turn from excessively increasing, and the stator winding space factor. And an increase in winding resistance per unit turn of the rectangular wire can be suppressed.
In addition, when forming the two adjacent first and second spiral coil portions, it is only necessary to execute either one of the inner winding of the flat wire or the outer winding of the flat wire, for example, the inner winding and the outer winding. The manufacturing method of the stator winding can be simplified without requiring a complicated process such as alternately performing the above and the like.

According to the stator winding of the present invention as set forth in claim 1, the accumulated amount of deformation of the rectangular wire and the winding length per unit turn increase excessively according to the number of replacements of the flat wire. This can be prevented and the space factor of the stator winding can be improved.
Furthermore, according to the stator winding of the present invention as set forth in claim 2, the length of the connecting portion between the spiral coil portions adjacent in the column direction, that is, the replacement portion where the rectangular wire is replaced in the adjacent row is shortened. Thus, an increase in winding resistance per unit turn of the flat wire can be suppressed.
Further, according to the stator winding of the present invention described in claim 3, for example, a single rectangular wire is provided for each of the plurality of teeth in a state where the total number of turns of the rectangular wire for each tooth is set to a predetermined value. Compared to the case where concentrated winding coils with concentrated winding are connected in parallel for each phase, the temperature rise caused by the resistance heating of the rectangular wire for each tooth is prevented from being excessively distributed between multiple teeth. Can do. Moreover, for example, in the case where the total number of turns of the rectangular wire for each tooth is set to a predetermined value, concentrated winding coils in which a single rectangular wire is concentratedly wound for each of a plurality of teeth are connected in series for each phase. As compared with the above, it is possible to reduce the energization amount required to generate the desired torque, to operate the motor efficiently, and to reduce the cross-sectional area of the rectangular wire.
Furthermore, according to the stator winding of the present invention as set forth in claim 4, it is possible to prevent the occurrence of a reflux current that circulates between a plurality of phase windings of the same phase, and an excessive amount. It is possible to prevent torque fluctuations from occurring.

Furthermore, according to the stator winding manufacturing method of the present invention as set forth in claim 5, the accumulated amount of deformation of the rectangular wire that increases with the number of replacements of the rectangular wire and the winding length per unit turn are excessive. The space factor of the stator winding can be improved, and an increase in winding resistance per unit turn of the rectangular wire can be suppressed.
Furthermore, according to the stator winding manufacturing method of the present invention as set forth in claim 6, the accumulated amount of deformation of the rectangular wire that increases with the number of times of replacement of the rectangular wire and the winding length per unit turn are excessive. The space factor of the stator winding can be improved, and an increase in winding resistance per unit turn of the rectangular wire can be suppressed. Moreover, by forming the two first and second spiral coil portions adjacent to each other by a single rectangular wire, for example, the two adjacent first and second spiral coil portions are connected by welding or the like. It is possible to prevent time and effort.
Furthermore, according to the stator winding manufacturing method of the present invention as set forth in claim 7, the accumulated amount of deformation of the rectangular wire that increases with the number of replacements of the rectangular wire and the winding length per unit turn are excessive. The space factor of the stator winding can be improved, and an increase in winding resistance per unit turn of the rectangular wire can be suppressed. In addition, when forming the two adjacent first and second spiral coil portions, it is only necessary to execute either one of the inner winding of the flat wire or the outer winding of the flat wire, for example, the inner winding and the outer winding. The manufacturing method of the stator winding can be simplified without requiring a complicated process such as alternately performing the above and the like.

  Hereinafter, a stator winding according to an embodiment of the present invention will be described with reference to the accompanying drawings.

Hereinafter, a stator winding according to Embodiment 1 of the present invention will be described with reference to the accompanying drawings.
A stator 1 according to the first embodiment includes, for example, a substantially annular stator core 3 configured by including a plurality of stator pieces 2,..., 2 arranged in the circumferential direction of the stator 1, as shown in FIG. An insulating bobbin 4 and a stator winding 5 composed of a flat wire 5 a wound around the insulating bobbin 4 are provided.
The stator piece 2 is configured to include, for example, a substantially fan-shaped yoke portion 6 and, for example, a substantially rectangular plate-shaped tooth portion 7, and the yoke portions 6 of the stator pieces 2, 2 adjacent in the circumferential direction of the stator 1. 6 is connected, and the annular yoke 1a is formed.
The yoke part 6 includes an engaging convex part 6a protruding from one end face 6A in the circumferential direction of the stator 1 and an engaging concave part 6b provided on the other end face 6B. When the end surfaces 2A and 2B are in contact with each other, the engaging projections 6a are engaged with the engaging recesses 6b.
The teeth portion 7 extends, for example, from the central portion in the circumferential direction of the yoke portion 6 toward the radially inner side of the stator core 3, and extends outward in the circumferential direction at the inner peripheral side end portion of the teeth portion 7. Portions 8 and 8 are provided.
The stator piece 2 is formed by laminating magnetic steel sheets having directivity, such as silicon steel sheets. For example, the yoke portion 6 has an easy magnetization direction set in the circumferential direction of the stator core 3, and the teeth 7 have an easy magnetization direction in the stator core 3. Is set in the radial direction.

The insulating bobbin 4 includes, for example, a substantially rectangular cylindrical tooth insulating portion 4a that covers the outer surface 7A of the tooth portion 7, and an axially outward direction of the tooth insulating portion 4a (that is, the radial direction of the stator core 3). Insulating extension portions 4b, 4c are provided, and the insulating extension portion 4b covers the surface of the inner peripheral surface 6C of the yoke portion 6 smoothly connected to the outer surface 7A of the tooth portion 7, The insulating extension 4c is arranged so as to cover the surface of the surface 8A of the extension 8 that is smoothly connected to the outer surface 7A of the tooth portion 7.
The teeth insulating portion 4a of the insulating bobbin 4 includes a plurality of rows of the rectangular wires 5a made of a conductive wire such as copper along the radial direction of the stator core 3 (that is, the direction in which the teeth portion 7 extends) and the teeth portions 7. The stator winding 5 is formed by being wound by concentrated winding on a plurality of layers along the thickness direction (that is, the direction orthogonal to the radial direction of the stator core 3).
The insulating extension 4c of the insulating bobbin 4 is provided with a guide groove 4d in which a flat wire 5a wound around the teeth insulating portion 4a is mounted, as shown in FIGS. 2 and 3, for example. The bottom surface of the groove 4d is formed so as to be smoothly connected to the outer peripheral surface of the tooth insulating portion 4a, and one end portion of the flat wire 5a wound on the outer peripheral surface of the tooth insulating portion 4a is connected to the outside via the guide groove 4d. To be guided to.

The stator winding 5 includes a plurality of spiral coil portions 5 ₁ ,..., 5 _n (n is an arbitrary natural number, for example, n = 7 in FIGS. 2 and 3).
Each of the spiral coil portions 5 ₁ ,..., 5 _n is formed by spirally winding a rectangular wire 5 a so as to form a plurality of layers in the thickness direction of the tooth portion 7, as will be described later. The portions 5 ₁ ,..., 5 _n are arranged so as to form a plurality of rows in the radial direction of the stator core 3 with the center axes of the portions 5 ₁ ,.
The spiral coil portions 5 _k and 5 _{(k + 1)} adjacent to each other in the radial direction of the stator core 3 _(where 1 ≦ k ≦ n−1) are included in one and the other spiral coil portions 5 _k and 5 _{(k + 1)} . The inner peripheral side ends or the outer peripheral side ends of one and the other spiral coil portions 5 _k , 5 _{(k + 1)} are connected to each other. That is, the inner peripheral side connection portion in which the inner peripheral side ends of the adjacent spiral coil portions 5 _k and 5 _{(k + 1)} are connected to each other and the outer peripheral side connection portion in which the outer peripheral side ends are connected to each other are rectangular wires. Reference numeral 5a denotes a column changing portion for changing columns. The inner peripheral side replacement portion 5c provided in the innermost layer of the multi-layer stator winding 5 and the outer peripheral side replacement portion 5b provided in the outermost layer of the multi-layer stator winding 5 are arranged in the column direction. Are provided alternately. For example, for a plurality of rows of vortex coil portions 5 _k and two vortex coil portions 5 _(k−1) and 5 _{(k + 1)} sandwiching the vortex coil portions 5 _k from both sides in the column direction, when the inner end portions of the appropriate spiral coil portion 5 _k and one of the spiral coil unit 5 _(k-1) is connected, a suitable spiral coil portion 5 _k and the other spiral coil unit 5 _When the outer peripheral side ends of _{(k + 1)} are connected to each other, and the outer peripheral side ends of the appropriate spiral coil portion _5k and one spiral coil portion 5 _(k-1) are connected to each other appropriately The inner peripheral side ends of the spiral coil portion 5 _k and the other spiral coil portion 5 _{(k + 1)} are connected to each other.
The flat wire 5a is formed, for example, to have a larger width than the thickness, and the thickness direction of the flat wire 5a is the same as the layer direction of the stator winding 5 and the width direction of the flat wire 5a is the same. The stator winding 5 is wound in the same direction as the row direction.
In the first embodiment, as will be described later, the stator winding 5 is formed of a single rectangular wire 5a. That is, the spiral coil portions 5 _k , 5 _{(k + 1)} (where 1 ≦ k ≦ n−1) adjacent in the column direction are formed by a single rectangular wire 5a, and the inner peripheral side connection portion and the outer peripheral side connection are formed. The part is an appropriate part of a single flat wire 5a.

The stator winding 5 according to the first embodiment has the above-described configuration. Next, a method for manufacturing the stator winding 5, that is, a method for winding the flat wire 5a around the teeth insulating portion 4a of the insulating bobbin 4 will be described. .
In the following, the direction from the radially outer side to the inner side of the stator core 3 is the column direction, and the thickness direction of the teeth insulating portion 4a of the insulating bobbin 4 (that is, the direction orthogonal to the radial direction of the stator core 3) The direction from one side to the other was defined as the layer direction.

First, in the first row 1L that is the start of winding of the flat wire 5a, for example, as shown in FIGS. 4 (a) to 4 (b), a position spaced apart from the outer peripheral surface 4A of the teeth insulating portion 4a by a predetermined distance in the layer direction. The rectangular wire 5a is spirally wound in a predetermined circumferential direction around the tooth insulating portion 4a (for example, counterclockwise when viewed along the row direction), and a plurality of times, for example, four times to fourth circumferential 1t, ..., a third layer 3C sequentially toward the inner layer from the fourth layer 4C as the outermost layer by 4t, the second layer 2C, a first spiral coil portion _{5 1} by laminating the first layer 1C Form. In the first spiral coil unit 5 _1, four laps 1t, ..., 3 times layers instead by 4t is executed.
Next, as shown in FIG. 4C, for example, the first layer 1C, which is the innermost layer of the _first spiral coil portion 51, is changed from the first row 1L to the second row 2L by the fifth turn 5t. In this second row 2L, for example, as shown in FIGS. 4D to 4E, in the same circumferential direction as the first row 1L (that is, counterclockwise when viewed along the row direction). The rectangular wire 5a is wound around in a spiral shape, and the second layer 2C, the third layer 2C, the third layer 2C, the third layer sequentially from the first layer 1C, which is the innermost layer, to the outer layer by a plurality of times, for example, the third to fifth turns 5t, 6t, 7t forming a second spiral coil unit 5 ₂ by laminating a layer 3C. In the second spiral coil unit 5 _2, three laps 5t, 6t, 1 single row instead of the a layer instead of two is performed by 7t.
Next, for example, as shown in FIG. 4 (e), the third layer 3C, which is the outermost layer of the _second spiral coil portion 52, is changed from the second row 2L to the third row 2L by the eighth turn 8t. In this third row 3L, for example, as shown in FIG. 4 (f), the rectangular wire 5a is placed in the same circumferential direction as the second row 2L (that is, counterclockwise when viewed along the row direction). The inner layer is spirally wound, and the second layer 2C and the first layer 1C are sequentially stacked from the third layer 3C, which is the outermost layer, to the inner layer by a plurality of times, for example, the eighth to tenth rounds 8t, 9t, and 10t. and forming a third spiral coil portion 5 _3. In the third spiral coil unit 5 _3, three laps 8t, 9t, once columns instead of the a layer instead of twice by 10t is executed.

Next, as shown in, for example, FIGS. 4F to 4G, the third row 3L to the fourth row 4L by the eleventh turn 11t from the first layer 1C serving as the innermost layer of the _third spiral coil portion 53. In this fourth row 4L, the rectangular wire 5a is spirally wound in the same circumferential direction as in the third row 3L, and a plurality of times, for example, two eleventh and twelfth rounds 11t, 12t by forming a fourth spiral coil unit 5 ₄ by laminating a second layer 2C toward the outer layer from the first layer 1C as a innermost layer.
Next, as shown in FIGS. 4G to 4H, for example, the fourth row 4L to the fifth row 5L are driven by the 12th turn 12t from the second layer 2C which is the outermost layer of the _fourth spiral coil portion 54. In this fifth row 5L, the rectangular wire 5a is spirally wound in the same circumferential direction as the fourth row 4L, and a plurality of times, for example, two thirteenth and fourteenth turns 13t, 14t by forming a spiral coil portion 5 ₅ 5 by laminating a first layer 1C toward the inner layer from the second layer 2C serving as the outermost layer.
Next, as shown in FIG. 4 (h) ~ (i) , the fifth spiral coil unit ₅ sixth column from the fifth column 5L from the first layer 1C as a innermost layer by the 15 circulation 15t of ₅ 6L In this sixth row 6L, the rectangular wire 5a is spirally wound in the same circumferential direction as the fifth row 5L in the sixth row 6L, and a plurality of times, for example, the fifteenth and sixteenth turns 15t, 16t by forming a fourth spiral coil unit 5 ₆ by laminating a second layer 2C toward the outer layer from the first layer 1C as a innermost layer.
Next, for example, as shown in FIG. 4 (i), the sixth row 6L is changed to the seventh row 7L by the 17th turn 17t from the second layer 2C which is the outermost layer of the _sixth spiral coil portion 56. In the seventh row 7L, the rectangular wire 5a is spirally wound in the same circumferential direction as the sixth row 6L, and the outermost layer is formed by a plurality of times, for example, two times of the 17th and 18th rounds 17t and 18t. The first layer 1C is laminated from the second layer 2C to the inner layer to form a _seventh spiral coil portion 57.

  That is, in the first embodiment, for example, four processes using a single rectangular wire 5a, that is, an inner winding process, a replacement process in the innermost layer, an outer winding process, and a row in the outermost layer are arranged. A plurality of layers and a plurality of rows of stator windings 5 are formed by repeating a series of steps of sequentially executing the replacement steps.

As described above, according to the stator winding 5 according to the first embodiment, for example, the inner peripheral side connection portion or the outer peripheral side connection in which the spiral coil portions 5 _k and 5 _{(k + 1)} adjacent in the radial direction of the stator core 3 are connected to each other. The flat wire 5a is merely replaced by adjacent columns only in the portion, and for example, it is possible to prevent the replacement portion from being formed in each layer of the plurality of layers of the stator winding 5. Thereby, it is possible to prevent the cumulative amount of deformation of the rectangular wire 5a that increases in accordance with the number of replacements of the rectangular wire 5a and the winding length per unit turn from being excessively increased. The space factor can be improved and an increase in winding resistance per unit turn of the flat wire 5a can be suppressed.
Further, for example, the outermost layer among the first and second spiral coil unit 5 _1, 5 _2, as the outermost layer among the like of the third and fourth spiral coil unit 5 _3, 5 _4, for example, adjacent teeth When the number of stacked flat wires 5a is changed between adjacent rows in accordance with the shape of the slot formed between the portions 7, 7, etc., and a step is formed on the outer peripheral surface of the stator winding 5, When adjacent spiral coil portions 5 _k , 5 _{(k + 1)} are connected to each other at the inner peripheral side connection portion, layer change and rearrangement are executed at the same position in the circumferential direction of the rotating rectangular wire 5a. For example, the amount of deformation of the flat wire 5a or the gap generated between the adjacent flat wires 5a, 5a is excessively increased, thereby preventing the occurrence of problems such as a decrease in the space factor. Can do.
Further, according to the method for manufacturing the stator winding 5 according to the first embodiment, for example, the outer winding process, the replacement process in the outermost layer, and the inner winding are sequentially performed on the single rectangular wire 5a. By repeating a series of steps of executing the steps and the step of replacing the innermost layer, a plurality of layers and rows of stator windings 5 can be formed.
Thereby, it is possible to prevent the cumulative amount of deformation of the rectangular wire 5a that increases in accordance with the number of replacements of the rectangular wire 5a and the winding length per unit turn from being excessively increased. The space factor can be improved and an increase in winding resistance per unit turn of the flat wire 5a can be suppressed. In addition, by forming the adjacent spiral coil portions 5 _k , 5 _{(k + 1)} by a single flat wire 5a, for example, the troublesome labor of connecting the adjacent spiral coil portions 5 _k , 5 _{(k + 1)} by welding or the like. Can be prevented.

Hereinafter, a stator winding according to a second embodiment of the present invention will be described with reference to the accompanying drawings.
In this Example 2, different from the first embodiment the main points described above for construction of the stator winding, the stator windings 5 are several flat wire 5a _1, ..., 5a m _(although, m is 1 ≦ m ≦ ( n + 1) / natural number of 2) is constituted by these plural rectangular wire 5a _1, ..., 5a _m via the weld is a point are connected to each other, the method of manufacturing the stator winding, the above-described embodiments example 1 differs main point is, a plurality of flat wire 5a _1, ..., 5a every _m after performing the winding to the tooth insulating portion 4a of the insulating bobbin 4, flat wire 5a j adjacent in the column _direction, 5a _{( j + 1)} (where 1 ≦ j ≦ m−1). In the following, description of the same parts as those in the first embodiment will be omitted.
In this second embodiment, as described later, the stator windings 5 are a plurality of rectangular wire 5a _1, ..., it is formed by 5a _m. The spiral coil portion ₅ k adjacent in the column _{direction, 5 (k + 1) (however,} 1 ≦ k ≦ n-1 ) among the spiral coil unit ₅ k of each other inner edge portion is _{connected, 5 (k + 1 )} Is formed by a single flat wire 5a _j , and this inner peripheral side connection portion (that is, the inner peripheral side replacement portion 5c shown in FIG. 6) is an appropriate portion of the single flat wire 5a _j. ing. On the other hand, the spiral coil portions 5 _k , 5 _{(k + 1)} to which the outer peripheral side ends are connected are formed by different rectangular wires 5 a _j , 5 a _{(j + 1)} . The outer peripheral side replacement portion 5b) shown is a welded portion in which the ends of different rectangular wires 5a _j and 5a _{(j + 1)} are connected by welding.

The stator windings 5 of the second embodiment includes the above-described configuration, then, a method of manufacturing the stator winding 5, that is, multiple flat wire 5a _1, ..., a 5a _m insulating bobbin 4 tooth insulating portion 4a A method for winding and connecting by welding will be described.
In the following, the direction from the radially outer side to the inner side of the stator core 3 is the column direction, and the thickness direction of the teeth insulating portion 4a of the insulating bobbin 4 (that is, the direction orthogonal to the radial direction of the stator core 3) The direction from one side to the other was defined as the layer direction.

First, in the first row 1L and the second row 2L, which are the start of winding of the first flat wire 5a ₁ , for example, as shown in FIG. 7A, the first flat wire 5a _{1 is connected} to the teeth insulating portion 4a. while disposed on the outer peripheral surface 4A, so that one end portion of the first flat wire 5a ₁ is the start point of the first column 1L, and the other end of the first flat wire 5a ₁ The columns are rearranged so that the side portion is the starting point of the second column 2L.
Then, for example, as shown in FIGS. 7B to 7C, in the first row 1L, the first circumferential direction around the teeth insulating portion 4a (for example, clockwise when viewed along the row direction) The rectangular wire 5a ₁ is wound in a spiral shape, and the second layer 2C is sequentially turned from the first layer 1C which is the innermost layer to the outer layer by a plurality of times, for example, four first to fourth turns 1p,. third layer 3C, to form a first spiral coil portion 5 ₁ by laminating a fourth layer 4C, in the second column 2L, the first column 1L opposite circumferential direction (i.e., along the column direction The first flat wire 5a ₁ is wound in a spiral shape (counterclockwise when viewed), and the first layer becomes the innermost layer by a plurality of times, for example, three first to fourth turns 1q, 2q, 3q. second layer 2C toward the sequentially outer layer from 1C, to form a second spiral coil unit 5 ₂ by laminating a third layer 3C .
Next, as shown in FIG. 7 (d), in a state in which the second flat wire 5a ₂ placed on the outer peripheral surface 4A of the tooth insulating portion 4a, one end side of the second flat wire 5a ₂ as part becomes the starting point of the third row 3L, and the other end side portion of the second rectangular wire 5a ₃ causes the column instead so that the starting point of the fourth column 4L.
For example, as shown in FIGS. 7E to 7F, in the third row 3L, the second rotation direction is the same as the first row 1L (that is, clockwise when viewed along the row direction). The rectangular wire 5a ₂ is wound in a spiral shape, and the number of turns equal to that of the second row 2L, that is, the first to third turns 1p, 2p, and 3p, the first layer 1C that is the innermost layer is sequentially turned to the outer layer. facing second layer 2C, with by laminating a third layer 3C to form a third spiral coil unit 5 _3, in the fourth column 4L, opposite circumferential direction to the third column 3L (i.e., along the column direction The first flat layer 1C that is the innermost layer by winding the _second rectangular wire 5a2 in a spiral shape in a counterclockwise direction when viewed in a plurality of times, for example, two first to second turns 1q, 2q. A second layer 2C is laminated from the outer layer toward the outer layer to form a _fourth spiral coil portion 54.
Then, for example, as shown in FIG. 7 (f), the other end 5a _{1B of} the first flat wire 5a ₁ disposed in the third layer which is the outermost layer of the _second spiral coil 52, 3 of a second flat one end 5a _2A of the rectangular wire 5a ₂ arranged in the third layer 3C as the outermost layer of the spiral coil unit 5 ₃ are connected by welding. At this time, for example, the first rectangular wire 5a ₁ forming the _second spiral coil portion 52 is rearranged from the second row 2L to the third row 3L by the third turn 3q in the second row 2L. In the third row 3L, the other end 5a _1B of the _first flat wire 5a _{1 and} the one end 5a _{2A of} the second flat wire 5a ₂ are welded.

Next, as shown in FIG. 7 (g), in a state in which a third of the rectangular wire 5a ₃ disposed on the outer peripheral surface 4A of the tooth insulating portion 4a, one end side of the third rectangular wire 5a ₃ The parts are rearranged so that the portion becomes the starting point of the fifth row 5L and the other end portion of the _third flat wire 5a3 becomes the starting point of the sixth row 6L.
For example, as shown in FIGS. 7 (h) to (i), in the fifth column 5L, the third rotation direction is the same as the third column 3L (that is, clockwise when viewed along the column direction). the rectangular wire 5a ₃ outer coiling spirally fourth column 4L equivalent cycle number, i.e. the first and second circumferential 1p twice, the second toward the outer from the first layer 1C as a innermost layer by 2p to form the spiral coil unit 5 ₅ of 5 stacked layers 2C, in the sixth column 6L, opposite circumferential direction to the fifth column 5L (i.e., counterclockwise when viewed along the column direction ) a third rectangular wire 5a ₃ wound outside spirally several times, for example twice of the first and second circumferential 1q, second layer 2C directed from the first layer 1C as a innermost layer by 2q in the outer layer Are stacked to form a _sixth spiral coil portion 56.
For example, as shown in FIG. 7 (i), the other end 5a _{2B of} the second flat wire 5a ₂ arranged in the second layer which is the outermost layer of the _fourth spiral coil portion 54, 5 of the one end portion 5a _3A of the third rectangular wire 5a ₃ arranged in a second layer 2C to be the outermost layer of the spiral coil unit 5 ₅ are connected by welding. At this time, for example, the second rectangular wire 5a ₂ forming the _fourth spiral coil portion 54 is rearranged from the fourth row 4L to the fifth row 5L by the second turn 2q in the fourth row 4L. In the fifth row 5L, the other end 5a _2B of the _second flat wire 5a _{2 and} the one end 5a _{3A of} the third flat wire 5a ₃ are welded.

Then, for example, the start point of the fourth state in which the flat wire 5a ₄ arranged on the outer peripheral surface 4A of the tooth insulating portion 4a, one end portion of the fourth flat wire 5a ₄ is seventh column 7L In this manner, the other end side portion of the _fourth rectangular wire 5a ₄ is rearranged so as to be mounted in the guide groove 4d provided in the insulating extension 4c of the insulating bobbin 4.
Then, in the seventh column 7L, wound outside the same circumferential direction as the fifth column 5L (i.e., clockwise when viewed along the column direction) a fourth rectangular wire 5a ₄ in a spiral shape, the sixth column 6L equivalent cycle number, i.e. the first and second circumferential 1p twice, the sixth spiral coil unit 5 ₆ by laminating a second layer 2C toward the outer layer from the first layer 1C as a innermost layer by 2p Form.
For example, as shown in FIG. 7 (i), the other end 5a _{3B of} the third flat wire 5a ₃ arranged in the second layer which is the outermost layer of the _sixth spiral coil portion 56, 6 and one end 5a _4A of the fourth flat wire 5a ₄ arranged in a second layer 2C to be the outermost layer of the spiral coil unit 5 ₆ are connected by welding. At this time, for example, the third rectangular wire 5a ₃ forming the _sixth spiral coil portion 56 is rearranged from the sixth row 6L to the seventh row 7L by the second turn 2q in the sixth row 6L. In the seventh row 7L, the other end 5a _3B of the _third flat wire 5a ₃ and one end 5a _{4A of} the fourth flat wire 5a ₄ are welded.

That is, in the second embodiment, the plurality of flat wire 5a _1, ..., each 5a _m, with one end portion and the other end portion to the column instead to belong to rows adjacent to each other Steps of externally winding one end side portion and the other end side portion in different circumferential directions, and the ends of different rectangular wires 5a _j , 5a _{(j + 1)} adjacent in the column direction in the outermost layer Are connected by welding to form a plurality of layers and a plurality of rows of stator windings 5.

As described above, according to the stator winding 5 according to the second embodiment, for example, the inner peripheral side connection portion or the outer peripheral side connection in which the spiral coil portions 5 _k and 5 _{(k + 1)} adjacent in the radial direction of the stator core 3 are connected to each other. The flat wire 5a is merely replaced by adjacent columns only in the portion, and for example, it is possible to prevent the replacement portion from being formed in each layer of the plurality of layers of the stator winding 5. Thereby, it is possible to prevent the cumulative amount of deformation of the rectangular wire 5a that increases in accordance with the number of replacements of the rectangular wire 5a and the winding length per unit turn from being excessively increased. The space factor can be improved and an increase in winding resistance per unit turn of the flat wire 5a can be suppressed.
Further, for example, the outermost layer among the first and second spiral coil unit 5 _1, 5 _2, as the outermost layer among the like of the third and fourth spiral coil unit 5 _3, 5 _4, for example, adjacent teeth When the number of stacked flat wires 5a is changed between adjacent rows in accordance with the shape of the slot formed between the portions 7, 7, etc., and a step is formed on the outer peripheral surface of the stator winding 5, Adjacent spiral coils 5 _k , 5 _{(k + 1)} are formed by a single flat wire 5 a (for example, the first flat wire 5 a ₁ or the second flat wire 5 a ₂ ), and the adjacent spiral coils 5 _k. , 5 _{(k + 1)} By omitting the welded portion connecting the end portions on the outer peripheral side, it is possible to prevent the layer change and the rearrangement from being executed at the same position in the circumferential direction of the rotating rectangular wire 5a. For example, the amount of deformation of the flat wire 5a is excessive. Much space factor can be prevented that occurs problems such as lowered.
Further, according to the method of manufacturing the stator winding 5 according to the second embodiment, the cumulative amount of deformation of the rectangular wire 5a that increases with the number of replacements of the rectangular wire 5a and the winding length per unit turn increase excessively. Thus, the space factor of the stator winding 5 can be improved, and an increase in winding resistance per unit turn of the flat wire 5a can be suppressed. In addition, when two adjacent spiral coil portions 5 _k , 5 _{(k + 1)} are formed by mutually different rectangular wires 5 a _j , 5 a _{(j + 1)} , only the outer winding of each rectangular wire 5 a _j , 5 a _{(j + 1)} is executed. For example, the manufacturing method of the stator winding 5 can be simplified without requiring a complicated process such as executing a mixture of an inner winding and an outer winding.

In the method of manufacturing the stator winding 5 according to the second embodiment described above, for example, the other end 5a _1B of the _first flat wire 5a ₁ and one end 5a _{2A of} the second flat wire 5a ₂ are connected. When welding, the other end 5a _1B of the _first flat wire 5a ₁ is replaced from the second row 2L to the third row 3L. However, the present invention is not limited to this. For example, the second flat wire one end _{5a 2A} of 5a ₂ to the third column 3L may be column instead to the second column 2L, for example, the first flat other corner lines 5a ₁ end _{5a 1B} and second flat wire and one end _{5a 2A} of 5a ₂ may be close to each other in the column direction.

In the first and second embodiments described above, all the rows of the stator winding 5 are constituted by the spiral coil portions 5 ₁ ,..., 5 _n , but some rows of the plurality of rows are the spiral coil portions 5 ₁ ,. _5n , and the other rows may be formed by repeating the replacement every round of the flat wire 5a and winding the flat wires 5a sequentially in the row direction in the same manner as the prior art. . Further, a part of the plurality of layers of the stator winding 5 is constituted by the spiral coil portion 5 _k (where 1 ≦ k ≦ n−1), and the other layers are formed in the same manner as in the above-described prior art, and the rectangular wire 5a. It may be formed by repeating the permutation and winding each layer in which the rectangular wires 5a are sequentially arranged in the column direction so as to be stacked by the permutation.

Hereinafter, a stator winding according to a third embodiment of the present invention will be described with reference to the accompanying drawings.
The stator 10 according to the third embodiment is provided in, for example, a three-phase motor of U phase, V phase, and W phase, and for example, as shown in FIG. A plurality of, for example, nine first to ninth salient pole portions T1,..., T9 projecting radially inward from the predetermined intervals, and the U, V, and W phase windings 12U, 12V, And a stator winding 13 made of 12 W.
For example, as shown in FIG. 9, the U-phase winding 12U includes a plurality of, for example, three first to third U-phase windings U ₁ , U ₂ , U ₃ connected in parallel to each other, and a V-phase winding 12V Includes a plurality of, for example, three first to third V-phase windings V ₁ , V ₂ , V ₃ connected in parallel to each other, and the W-phase winding 12W includes a plurality of, for example, three, connected in parallel to each other The first to third W-phase windings W ₁ , W ₂ and W ₃ are provided.

Then, the 1U-phase winding _{U 1} each salient pole portion T1, T4, T7 wound windings _U 1 that is wound _{(T1), U 1 (T4} ), U 1 (T7) is connected to the series arrangement is, the 2U-phase winding _{U 2} each salient pole portion T1, T4, T7 wound windings _U 2 which is wound _{(T1), U 2 (T4} ), U 2 (T7) is connected to the series arrangement is, the 3U phase winding _{U 3} each winding _U 3 to wound each salient pole portion T1, T4, T7 wound _{(T1), U 3 (T4} ), U 3 (T7) is connected to the series arrangement Has been.
Further, the 1V phase winding _{V 1} was each salient pole portion T2, T5, T8 wound winding _V 1 to be rotated _{(T2), V 1 (T5} ), V 1 (T8) is connected to the series arrangement is, the 2V phase winding _{V 2} are each salient pole portion T2, T5, T8 wound windings _V 2 to be rotated _{(T2), V 2 (T5} ), V 2 (T8) is connected to the series arrangement is, the 3V phase winding _{V 3} are each salient pole portion T2, T5, T8 wound windings _V 3 to be rotated _{(T2), V 3 (T5} ), V 3 (T8) is connected to the series arrangement Has been.
Further, the 1W phase winding _{W 1} each salient pole portion T3, T6, T9 wound windings _W 1 that is wound _{(T3), W 1 (T6} ), W 1 (T9) is connected to the series arrangement is, the 2W phase winding _{W 2} each salient pole portion T3, T6, T9 wound windings _W 2 that is rotated _{(T3), W 2 (T6} ), W 2 (T9) is connected to the series arrangement is, the 3W phase winding _{W 3} being each winding _W 3 that is rotated each salient pole portion T3, T6, T9 wound _{(T3), W 3 (T6} ), W 3 (T9) is connected to the series arrangement Has been.

The total number of turns for each salient pole portion T1,..., T9 is set to be equal.
For example, in the U-phase winding 12U, i is an arbitrary natural number of 1 ≦ i ≦ 3, and the number of turns of each winding U _i (T1), U _i (T4), U _i (T7) is N {U _i (T1). }, N {U _i (T4)}, N {U _i (T7)}, the first salient pole portion T1, the fourth salient pole portion T4, and the seventh salient portion as shown in the following formula (1). The total number of turns in the pole portion T7 is set to be equal.
Similarly, for example, in the V-phase winding 12V, j is an arbitrary natural number of 1 ≦ j ≦ 3, and the number of turns of each winding V _j (T2), V _j (T5), V _j (T8) is N {V _j (T2)}, N { _Vj (T5)}, N { _Vj (T8)}, the second salient pole portion T2 and the fifth salient pole portion T5 as shown in the following formula (2). And the eighth salient pole portion T8 are set to have the same total number of turns.
Similarly, in the W-phase winding 12W, for example, k is an arbitrary natural number of 1 ≦ k ≦ 3, and the number of turns of each winding W _k (T3), W _k (T6), W _k (T9) is N {W _k (T3)}, N {W _k (T6)}, N {W _k (T9)}, the third salient pole portion T3 and the sixth salient pole portion T6 as shown in the following formula (3). And the ninth salient pole portion T9 are set to have the same total number of turns.

Further, the three first to third V-phases connected in parallel with each other so that the impedances of the _{three first} to third U-phase windings U ₁ , U ₂ , U ₃ connected in parallel are equal to each other. The impedances of the three first to third W-phase windings W ₁ , W ₂ , and W ₃ connected in parallel to each other are equal so that the impedances of the windings V ₁ , V ₂ , and V ₃ are equivalent. The first to third U-phase windings U ₁ , U ₂ , U ₃ and the first to third V-phase windings V ₁ , V ₂ , and the like at the salient pole portions T1,. The number of turns of V ₃ and each of the first to third W-phase windings W ₁ , W ₂ , W ₃ is set to a predetermined number.
For example, in the U-phase winding 12U, as shown in the following formula (4), the total number of turns of the _first to third U-phase windings U ₁ , U ₂ , U ₃ is set to be equal to each other. In the winding 12V, as shown in the following formula (5), the total number of turns of the _first to third V-phase windings V ₁ , V ₂ , V ₃ is set to be equal, for example, the W-phase winding 12W Then, as shown in the following mathematical formula (6), the total number of turns of the _first to third W-phase windings W ₁ , W ₂ , W ₃ is set to be equal.

As described above, in each of the U, V, and W phase windings 12U, 12V, and 12W, the first to third U phase windings U ₁ , U ₂ , U ₃ and the first to third V phase windings connected in parallel. V _{1, V} 2, _{V 3} and the first to 3W phase winding _{W 1,} W 2, _W each salient pole portion T1 of _3, ..., need not be limited to the same number of turns at T9, the butt The total number of turns for each of the pole portions T1,..., T9 can be set to a value other than a multiple of the number of divisions of the parallel connection (for example, “3” in the stator 10 shown in FIG. 9).
For example, in the U-phase winding 12U, the total number of turns of the first salient pole portion T1, the fourth salient pole portion T4, and the seventh salient pole portion T7 is set to 42, and each salient pole portion T1, T4, T7 The number of turns N {U _i (T1)}, N {U _i (T4)}, and N {U _i (T7)} of the _first to third U-phase windings U ₁ , U ₂ , U ₃ are set to different values. When set, the number of turns N {U _i (T1)}, N {U _i (T4)}, N {U _i (T7)} can be set as shown in the following formula (7), for example. it can.
Further, the total number of turns of the first salient pole portion T1, the fourth salient pole portion T4, and the seventh salient pole portion T7 is set to 50, which is a value other than a multiple of the number of divisions of the parallel connection (for example, 3). In this case, the number of turns N {U _i (T1)}, N {U _i (T4)}, and N {U _i (T7)} can be set, for example, as shown in the following formula (8).

For example, as shown in FIG. 10, in each salient pole portion T1,..., T9, the first to third U-phase windings U ₁ , U ₂ , U ₃ and the first to third V-phase windings V ₁ , V 3 ₂ , V ₃ and the first to third W-phase windings W ₁ , W ₂ , W ₃ are wound at predetermined positions in the column direction according to the number of turns, for example, the above formula (8) As shown in FIG. 5, when 50, which is the total number of turns for each salient pole part T1,..., T9, is divided into three parts of 20 turns, 17 turns, and 13 turns, the base end part of each salient pole part T1,. (That is, in the vicinity of the connection portion with the yoke 11 in the radial direction), 20 windings are wound, and 17 windings are wound in the central portion, and the tip (that is, radially inward) 13 ends of the number of windings are wound around the end.
Thus, in the U-phase winding 12U shown in FIG. 11, for example, the first salient pole portion T1, the 1U-phase winding _{U 1} is wound by 20 turns at the proximal end portion, the 2U phase central portion winding U ₂ is wound at 17 turns, the 3U phase winding U ₃ is wound by 13 turns to the tip. Then, in the fourth salient pole portion T4, the 2U-phase winding _{U 2} is wound at 20 turns on the proximal end portion, a 3U phase winding _{U 3} is wound by 17 turns to the central unit, the 1U phase winding U ₁ is wound by 13 turns to the tip. Then, in the seventh salient pole portion T7, the 3U phase winding _{U 3} is wound by 20 turns at the proximal end portion, the 1U-phase winding _{U 1} is wound by 17 turns to the central unit, The _2nd U-phase coil | winding U2 is wound by 13 turns at the front-end | tip part.

In each salient pole portion T1,..., T9, the first to third U-phase windings U ₁ , U ₂ , U ₃ and the first to third V-phase windings V ₁ , V ₂ , V ₃ and the first To the third W-phase windings W ₁ , W ₂ , W ₃ are each constituted by a single rectangular wire 5a, and a plurality of spiral coil portions 5 ₁ ,..., 5 _n (n is an arbitrary natural number, for example, The above equation (7) and n = 4 in FIG. 11 are provided. Each of the spiral coil portions 5 ₁ ,..., 5 _n is formed by being spirally wound so that the flat wire 5a forms a plurality of layers in the thickness direction of each salient pole portion T1,. The coil portions 5 ₁ ,..., 5 _n are arranged so as to form a plurality of rows in the radial direction of the salient pole portions T 1,.
Then, the spiral coil portions 5 _m , 5 _{(m + 1)} adjacent to each other in the radial direction of the salient pole portions T1,..., T9 (where 1 ≦ m ≦ n−1) are one and the other spiral coil portions 5 _m. , 5 _{(m + 1)} inner peripheral side ends or one and the other spiral coil portions 5 _m , 5 _{(m + 1)} outer peripheral side end portions are connected to each other, and these inner peripheral side connecting portion and outer peripheral side connection are connected to each other. The part is an appropriate part of a single flat wire 5a.
The first to third U-phase windings U ₁ , U ₂ , U _{3, the} first to third V-phase windings V ₁ , V ₂ , V ₃ and the first to third W-phase windings W ₁ , In W ₂ and W ₃ , both end portions of each single flat wire 5 a are arranged in the outermost layer and are configured to be outer end portions.

In the stator 10 according to the third embodiment, the rectangular wires 5a, 5a having the same phase between the salient pole portions T1,..., T9 are located on the outer peripheral portion and the inner peripheral portion at both ends along the axial direction of the stator 10. They are connected via a connecting rectangular wire 5a.
For example, as shown in FIGS. 11 to 13, when one of the both end portions along the axial direction of the stator 10 is the front end portion and the other is the back end portion, the U-phase winding 12U The rectangular wire 5a for connection to the _first U-phase winding U1 is disposed on the outer peripheral portion of the front end portion of the stator 10, and the rectangular wire 5a for connection to the _second U-phase winding U2 is the back side of the stator 10. The rectangular wire 5a for connection to the _third U-phase winding U3 is disposed on the inner peripheral portion of the front end portion of the stator 10.
The flat wire 5a for connection between each of these salient pole portions T1,..., T9 is, for example, the salient pole portions around which the same phase rectangular wires 5a, 5a connected in series are wound. The flat wire 5a wound around one salient pole part is, so to speak, drawn to the other salient pole part, and reaches the other salient pole part after being wound around one salient pole part. The end of the flat wire 5a disposed up to and the end of the flat wire 5a wound around the other salient pole are connected by, for example, welding.

For example, FIG. 12 and the U-phase winding 12U shown in FIG. 13, current applying apparatus flat wire _5a for current energizing the first 1U phase current _{I U1} to the 1U-phase winding _{U 1} is connected to a (not shown) _{U1 ( E)} is arranged on the outer peripheral portion 10a on the front side of the stator 10, and is arranged so that the end of this conducting rectangular wire 5a _{U1 (E)} reaches the base end of the first salient pole portion T1. Yes. In the first salient pole portion T1, one end portion of the single flat wire 5a _{U1 (T1)} forming the _first U-phase winding U ₁ (T1) wound around the base end portion is the base end portion. In the nearby joining part 21a, it is joined to the end part of the conducting rectangular wire 5a _{U1 (E)} . Further, the flat wire 5a _{U1 (T1)} is disposed on the outer peripheral portion 10a on the front side of the stator 10 so that the other end portion reaches the base end portion of the fourth salient pole portion T4.
Further, the energization device flat wire _5a for current energizing the first 2U phase current _{I U2} to the 2U phase winding _{U 2} is connected to a (not shown) _{U2 (E)} is an outer peripheral portion 10b of the rear side of the stator 10 It is arrange | positioned and it arrange | positions so that the edge part of this rectangular wire 5a _{U2 (E)} for electricity supply may reach | attain the base end part of 1st salient pole part T1. In the first salient pole portion T1, one end portion of the single rectangular wire 5a _{U2 (T1)} forming the _second U-phase winding U ₂ (T1) wound around the central portion is in the vicinity of the base end portion. Is joined to the end of the conducting rectangular wire 5a _{U2 (E)} . Further, the flat wire 5a _{U2 (T1)} is disposed on the outer peripheral portion 10b on the back side of the stator 10 so that the other end portion reaches the base end portion of the fourth salient pole portion T4.
Further, a rectangular wire 5a _{U3 (E)} for energization that is connected to an energization device (not shown) and energizes the _third U-phase winding _U3 with the third U-phase current _IU3 is an inner peripheral portion 10c on the front side of the stator 10. The end portion of the rectangular wire 5a _{U3 (E)} for energization is disposed so as to reach the tip end portion of the first salient pole portion T1. In the first salient pole portion T1, one end portion of the single rectangular wire 5a _{U3 (T1)} forming the _third U-phase winding U ₃ (T1) wound around the tip portion is in the vicinity of the tip portion. In the joining part 21c, it joins to the edge part of the rectangular wire 5a _{U3 (E)} for electricity supply. Further, the flat wire 5a _{U3 (T1)} is disposed on the inner peripheral portion 10c on the front side of the stator 10 so that the other end portion reaches the tip end portion of the fourth salient pole portion T4.

In the fourth salient pole portion T4, one end portion of the single rectangular wire 5a _{U1 (T4)} forming the _first U-phase winding U ₁ (T4) wound around the distal end portion is in the vicinity of the proximal end portion. Are joined to the ends of the flat wire 5a _{U1 (T1)} extending from the first salient pole portion T1. Further, the flat wire 5a _{U1 (T4)} is disposed on the outer peripheral portion 10a on the front side of the stator 10 so that the other end portion reaches the base end portion of the seventh salient pole portion T7.
Further, in the fourth salient pole portion T4, one end portion of the single flat wire 5a _{U2 (T4)} forming the _second U-phase winding U ₂ (T4) wound around the base end portion is the base end portion. In the adjacent joint 24b, the joint is joined to the end of the flat wire 5a _{U2 (T1)} extending from the first salient pole T1. Further, the flat wire 5a _{U2 (T4)} is disposed on the outer peripheral portion 10b on the back side of the stator 10 so that the other end portion reaches the base end portion of the seventh salient pole portion T7.
In addition, in the fourth salient pole portion T4, one end portion of the single rectangular wire 5a _{U3 (T4)} forming the _third U-phase winding U ₃ (T4) wound in the central portion is near the tip portion. The joint 24c is joined to the end of the flat wire 5a _{U3 (T1)} extending from the first salient pole T1. Further, the flat wire 5a _{U3 (T4)} is arranged on the inner peripheral portion 10c on the front side of the stator 10 so that the other end portion reaches the tip end portion of the seventh salient pole portion T7.

In the seventh salient pole portion T7, for example, as shown in FIG. 14, _{one of the} single rectangular wires 5a _{U1 (T7)} forming the _first U-phase winding U ₁ (T7) wound around the central portion. The end portion is joined to the end portion of the flat wire 5a _{U1 (T4)} extending from the fourth salient pole portion T4 at the joint portion 27a in the vicinity of the base end portion. Further, the rectangular wire 5a _{U1 (T7)} is disposed on the outer peripheral portion 10a on the front side of the stator 10 so that the other end portion is connected to the midpoint.
In addition, in the seventh salient pole portion T7, one end portion of the single rectangular wire 5a _{U2 (T7)} forming the _second U-phase winding U ₂ (T7) wound around the distal end portion is in the vicinity of the proximal end portion. Are joined to the ends of the flat wire 5a _{U2 (T4)} extending from the fourth salient pole part T4. Further, the flat wire 5a _{U2 (T7)} is disposed on the outer peripheral portion 10b on the back side of the stator 10 so that the other end is connected to the midpoint.
In addition, in the seventh salient pole portion T7, one end portion of the single rectangular wire 5a _{U3 (T7)} forming the _third U-phase winding U ₃ (T7) wound around the base end portion is in the vicinity of the distal end portion. Are joined to the ends of the flat wire 5a _{U3 (T4)} extending from the fourth salient pole portion T4. Further, the rectangular wire 5a _{U3 (T7)} is disposed on the inner peripheral portion 10c on the front side of the stator 10 so that the other end is connected to the midpoint.

As described above, according to the stator winding 13 according to the third embodiment, each winding (for example, each winding U _i (T1)) in parallel with each other for each of the first to ninth salient pole portions T1,. 1 ≦ i ≦ 3, etc.), and appropriate windings provided in the first to ninth salient pole portions T1,..., T9 between the first to ninth salient pole portions T1,. For example, the windings U _i (T1), U _i (T4), U _i (T7), etc.) are connected in series so that the plurality of first to ninth salient pole portions T1,. As shown in FIG. 21, for example, the current values of the currents are equal to each other, and the total number of turns of the rectangular wire 5a for each of the first to ninth salient pole portions T1,. Compared to a case where concentrated winding coils of independent winding are provided for each salient pole portion T1,. It is possible to prevent the temperature rise caused by the resistance heating of the flat wire 5a for each of the ninth salient pole portions T1,..., T9 from excessively varying between the first to ninth salient pole portions T1,. .
Moreover, for example, in a state where the total number of turns of the flat wire 5a for each of the first to ninth salient pole portions T1,..., T9 is set to a predetermined value, a single value is provided for each salient pole portion T1,. The total resistance value of the stator winding 13 can be reduced as compared with the case where the concentrated winding coils around which the rectangular wires 5a are concentrated are connected in series for each same phase. Thereby, the energization amount required for generating a desired torque can be reduced, the motor can be operated efficiently, and the cross-sectional area of the flat wire 5a can be reduced.
In addition, the plurality of phase windings U ₁ , U ₂ , U ₃ , V ₁ , V ₂ , V ₃ , W ₁ , W ₂ , W ₃ are set to have the same impedance so that they are the same. Prevents a return current from circulating between the phase windings U ₁ , U ₂ , U ₃ , V ₁ , V ₂ , V ₃ , W ₁ , W ₂ , W ₃ of the phase. it can, each salient pole portion T1, ..., such that the total number of turns of each T9 is equal, i.e. each salient pole portion T1, ..., windings provided for each T9 (for example, each winding U _{i (T1} ) Excessive torque fluctuation by setting the combined impedance of salient pole portions T1,..., T9 to be equal to the combined impedance obtained by combining the impedances of 1 ≦ i ≦ 3) Can be prevented from occurring.

In the third embodiment, each U, V, W phase winding 12U, 12V, 12W is connected to three first to third U phase windings U ₁ , U ₂ , U ₃ connected in parallel with each other, The first to third V-phase windings V ₁ , V ₂ , and V ₃ and the first to third W-phase windings W ₁ , W ₂ , and W ₃ are configured, but not limited thereto, for example, FIG. as in the first modification of the third embodiment shown, each U, V, W-phase winding 12U, 12V, and 12W, 2 two first connected in parallel with each other, the 2U-phase winding _U 1, _{U 2} And the first and second V-phase windings V ₁ and V ₂ and the first and second W-phase windings W ₁ and W ₂ , or for example, four or more connected in parallel Arbitrary natural number m of first to m-th U-phase windings U ₁ ,..., U _m , first to _m- th V-phase windings V _{1 to} V _m , and first to _m- th W-phase windings W _1. , ..., and a _{W m} It may form.
In the third embodiment, the stator 10 includes nine first to ninth salient pole portions T1,..., T9. However, the present invention is not limited to this, and for example, the third embodiment shown in FIGS. For example, the stator 10 may include twelve first to twelfth salient pole portions T1,..., T12, as shown in FIGS. As in the fifth modification of the third embodiment, for example, the stator 10 may include 18 first to 18th salient pole portions T1,..., T18, or any other natural number m. You may comprise including the 1st-m-th salient pole part T1, ..., Tm.
Further, in the third embodiment, for example, as shown in FIG. 11, each of the first to third U-phase windings U ₁ , U ₂ , U ₃ and each of the first to third V-phase windings V ₁ , V 3 ₂ , V ₃ , and for each of the first to third W-phase windings W ₁ , W ₂ , W ₃ , an equivalent number n of spiral coil portions 5 ₁ ,..., 5 _n (n is an arbitrary natural number) , For example, n = 4), but is not limited thereto. For each of the first to third U-phase windings U ₁ , U ₂ , U ₃ and each of the first to third V-phase windings V ₁ , V ₂ , V ₃ , and the first to third W-phase windings W ₁ , W ₂ , W ₃ may have different numbers of spiral coils. For example, each relative to the first to 3U phase winding _{U 1,} U 2, _{U 3,} spiral coil unit ₅ 1 of the first 1U phase winding _{U 1} more p, ..., a _{5 p} (p is an arbitrary , 5 _q (q is an arbitrary natural number), and the _second U-phase winding U ₂ is configured with a plurality of q spiral coil portions 5 ₁ ,. ₃ is composed of a plurality of r spiral coil portions 5 ₁ ,..., 5 _r (where r is an arbitrary natural number).

Here, for example, in the second modification shown in FIG. 16, the U, V, W-phase winding 12U, 12V, and 12W, 2 two first connected in parallel with each other, the 2U-phase winding _U 1, U ₂ , first and second V-phase windings V ₁ and V _2, and first and second W-phase windings W ₁ and W _2, and each first and second U-phase winding U ₁ , U ₂ is wound around each of the first salient pole portion T1, the fourth salient pole portion T4, the seventh salient pole portion T7, and the tenth salient pole portion T10 with a predetermined number of turns, and each of the first and second V-phase windings V ₁ and V ₂ are wound around each of the second salient pole portion T2, the fifth salient pole portion T5, the eighth salient pole portion T8, and the eleventh salient pole portion T11 with a predetermined number of turns. The phase windings W ₁ and W ₂ are wound around the third salient pole portion T3, the sixth salient pole portion T6, the ninth salient pole portion T9, and the twelfth salient pole portion T12 with a predetermined number of turns, so to speak, 4 series. Configure to be connected in parallel That.
For example, in the third modification shown in FIG. 17, each of the U, V, and W phase windings 12U, 12V, and 12W is connected to four first to fourth U phase windings U ₁ ,. and U _4, first to 4V phase winding _V 1, ..., and _{V 4,} first to 4W phase winding _W 1, ..., constituted by a _{W 4,} first to 4U phase winding The wires U ₁ ,..., U ₄ are wound around the first salient pole portion T1, the fourth salient pole portion T4, the seventh salient pole portion T7, and the tenth salient pole portion T10 with a predetermined number of turns. ˜V4 windings V ₁ ,..., V ₄ are wound around each second salient pole portion T2, fifth salient pole portion T5, eighth salient pole portion T8, and eleventh salient pole portion T11 with a predetermined number of turns. Turn, each first to 4W phase winding _W 1, ..., a _{W 4,} in each third salient pole portion T3 and sixth salient pole portion T6 and ninth salient pole portion T9 and the 12 salient pole T12 Winding with a predetermined number of turns, so to speak, 4 series 4 parallel connection state It is configured to be.
For example, in the fourth modified example shown in FIG. 18, each U, V, W phase winding 12U, 12V, 12W is connected to each of the first, second U phase windings U ₁ , two windings connected in parallel. U ₂ , _third and _fourth U-phase windings U ₃ and U ₄ , _first and _second V-phase windings V ₁ and V ₂ , _third and _fourth V-phase windings V ₃ and V _4, and first and second W The phase windings W ₁ and W ₂ and the _third and _fourth W-phase windings W ₃ and W ₄ are further connected in parallel for each same phase, and the first and second U-phase windings U ₁ and U ₂ is wound around each of the first salient pole portions T1 and the seventh salient pole portions T7 with a predetermined number of turns, and the third and fourth U-phase windings U ₃ and U ₄ are respectively wound on the fourth salient pole portions T4 and the tenth salient pole. The first and second V-phase windings V ₁ and V ₂ are wound around the second salient pole portion T2 and the eighth salient pole portion T8 at a predetermined number of turns, respectively. 3, the 4V phase winding _V 3, _{V 4} each fifth salient pole portion T5 Wound at a predetermined number of turns and the 11 salient pole portion T11, first, winding at the 2W phase winding _W 1, _{W 2} and each third salient pole portion T3 predetermined number of turns in the ninth salient pole T9 The third and fourth W-phase windings W ₃ and W ₄ are wound around the sixth salient pole portion T6 and the twelfth salient pole portion T12 with a predetermined number of turns.

For example, in the fifth modified example shown in FIGS. 19 and 20, each U, V, W phase winding 12U, 12V, 12W is connected to each of the first, second, 3U phases in which three windings are connected in parallel. Windings U ₁ , U ₂ , U ₃ , _fourth , _fifth , and _sixth U-phase windings U ₄ , U ₅ , U ₆ , _first , _second , and _third V-phase windings V ₁ , V ₂ , V ₃ , _Fourth , _fifth , and _sixth V-phase windings V ₄ , V ₅ , and V ₆ , _first , _second , and _third W-phase windings W ₁ , W ₂ , and W _3, and _fourth , _fifth , and _sixth W-phase windings W ₄ , W ₅ and W ₆ are further connected in parallel for each same phase. Then, the _first , _second , and _third U-phase windings U ₁ , U ₂ , and U ₃ are wound around the first salient pole portion T1, the seventh salient pole portion T7, and the thirteenth salient pole portion T13 with a predetermined number of turns, The _fourth , _fifth , and _sixth U-phase windings U ₄ , U ₅ , and U ₆ are wound around the fourth salient pole portion T4, the tenth salient pole portion T10, and the sixteenth salient pole portion T16 with a predetermined number of turns. , ₂ and ₃ V-phase windings V ₁ , V ₂ and V ₃ are wound around the second salient pole part T 2, the eighth salient pole part T 8 and the 14th salient pole part T 14 with a predetermined number of turns. , 6 V-phase windings V ₄ , V ₅ , V ₆ are wound around the fifth salient pole portion T5, the eleventh salient pole portion T11, and the seventeenth salient pole portion T17 with a predetermined number of turns, respectively. The phase windings W ₁ , W ₂ , and W ₃ are wound around the third salient pole portion T3, the ninth salient pole portion T9, and the fifteenth salient pole portion T15 with a predetermined number of turns, and the fourth, fifth, and sixth W phase windings. line _{W 4, W 5, W 6} and between the sixth salient pole portion T6 first And wound at a predetermined number of turns to a salient pole portion T12 and the 18 salient pole portion T18.
For example, as shown in FIG. 20, the first to 6U phase winding _U 1, ..., a 6V phase winding _V 1 first to the _{U 6,} ..., _{V 6} and first to 6W phase winding One end of each of the wires W ₁ ,..., W ₆ is connected to a current-carrying device (not shown) via the connection terminals 15U, 15V, 15W of the same phase of the terminal portion 14, and the other end. Is connected to the midpoint 16.

It is a sectional side view of the stator which concerns on embodiment of this invention. 3 is a side view showing an outermost layer of the stator winding according to Embodiment 1. FIG. FIG. 3 is a diagram illustrating an innermost layer of the stator winding according to the first embodiment and a main part of the stator winding broken away. 4 (a) to 4 (i) are diagrams showing the respective steps of forming the stator winding shown in FIG. 2 by winding a rectangular wire around the teeth insulating portion of the insulating bobbin. It is a figure which fractures | ruptures and shows the principal part of a stator coil | winding while showing an outer layer. 6 is a side view showing an outermost layer of a stator winding according to Embodiment 2. FIG. It is a figure which fractures | ruptures and shows the principal part of a stator winding while showing the innermost layer of the stator winding concerning Example 2. FIG. FIGS. 7A to 7I are views showing the respective steps of forming the stator winding shown in FIG. 5 by winding a rectangular wire around the teeth insulating portion of the insulating bobbin. It is a figure which fractures | ruptures and shows the principal part of a stator coil | winding while showing an outer layer. 6 is a diagram schematically showing a stator according to Embodiment 3. FIG. It is a figure which shows the connection state of the stator coil | winding which concerns on Example 3. FIG. It is a figure which shows the winding state in each salient pole part of the stator coil | winding which concerns on Example 3. FIG. It is a figure which fractures | ruptures and shows the principal part of a stator winding while showing an innermost layer with respect to the U-phase winding in each salient pole part of the stator winding concerning Example 3. FIG. It is the side view which looked at the outermost layer of the stator winding concerning Example 3 from one side to the other along the axial direction. It is the side view which looked at the outermost layer of the stator winding concerning Example 3 from one side to the other along the axial direction. It is a figure which expands and shows the junction part in the salient pole part of the stator winding | winding shown in FIG. FIG. 10 is a diagram showing a connection state of a stator winding according to a first modification of Example 3. FIG. 10 is a diagram illustrating a connection state of stator windings according to a second modification of the third embodiment. FIG. 10 is a diagram illustrating a connection state of stator windings according to a third modification of the third embodiment. FIG. 10 is a diagram illustrating a connection state of stator windings according to a fourth modification of the third embodiment. FIG. 10 is a diagram illustrating a connection state of stator windings according to a fifth modification of the third embodiment. FIG. 10 is a side view of a stator according to a fifth modification example of Embodiment 3. It is a figure which shows the connection state of the stator winding concerning an example of a prior art.

Explanation of symbols

1 stator 4 insulating bobbin 5 and 13 stator windings _{5 1,} ..., 5 _n spiral coil unit

Claims (7)

A stator winding in which rectangular wires are intensively wound in a plurality of rows and a plurality of layers for each of a plurality of teeth arranged at predetermined intervals in the circumferential direction of the stator,
For each of the plurality of rows along the radial direction of the stator, a spiral coil portion wound in a spiral shape so that the flat wire forms the plurality of layers,
A stator winding, wherein the plurality of spiral coil portions are arranged along the radial direction of the stator so as to form the plurality of rows. The spiral coil portions adjacent to each other in the radial direction of the stator are connected to the inner peripheral side ends of one and the other spiral coil portions, or the outer peripheral side ends of the one and the other spiral coil portions. The stator winding according to claim 1, wherein: The stator winding of a plurality of phases comprises a plurality of phase windings connected in parallel to each other for each phase,
In each of the plurality of phase windings, winding portions provided for each of a plurality of teeth are connected in series,
2. The stator winding according to claim 1, wherein each of the winding portions is arranged along a radial direction of the stator such that a plurality of the spiral coil portions form the plurality of rows. The number of turns of the rectangular wire of each winding part is:
The mutual impedances of the plurality of teeth are equal to each other and the combined impedances obtained by synthesizing the impedances of the plurality of winding portions provided for each of the plurality of teeth are equal to each other. The combined impedance is set to be equal,
The stator winding according to claim 3, wherein the number of turns of the plurality of winding portions provided for each of the plurality of phase windings is set to a value different from each other. A stator winding manufacturing method for intensively winding a plurality of rectangular wires in a plurality of rows and a plurality of layers for each of a plurality of teeth arranged at predetermined intervals in the circumferential direction of the stator,
For each of the plurality of rows along the radial direction of the stator, a spiral coil portion is formed by winding the rectangular wire spirally so as to form the plurality of layers,
A method of manufacturing a stator winding, wherein the plurality of spiral coil portions are arranged along the radial direction of the stator so as to form the plurality of rows. A single spiral wire is wound around the plurality of appropriate rows to form a first spiral coil portion, and is connected to the outermost layer of the first spiral coil portion in a row adjacent to the appropriate row. Forming the single rectangular wire inwardly around the first spiral coil portion to form a second spiral coil portion, thereby forming the spiral coil portions adjacent in the radial direction of the stator. To
Or
A single spiral wire is formed by winding a single rectangular wire in an appropriate row of the plurality of rows, and is connected to the innermost layer of the first spiral coil portion in a row adjacent to the appropriate row. By winding the single rectangular wire around the same direction as the first spiral coil part to form a second spiral coil part, the spiral coil parts adjacent in the radial direction of the stator are The stator winding manufacturing method according to claim 5, wherein the stator winding is formed. A first spiral coil portion is formed by winding the first rectangular wire in an appropriate row of the plurality of rows, and a second rectangular wire is connected to the first spiral shape in a row adjacent to the appropriate row. The second spiral coil part is formed by external winding in the reverse direction of the coil part,
By connecting the outer peripheral side ends of the first spiral coil portion and the second spiral coil portion, the spiral coil portions adjacent in the radial direction of the stator are formed.
Or
A first spiral coil portion is formed by winding the first rectangular wire in an appropriate row of the plurality of rows, and a second rectangular wire is connected to the first spiral shape in a row adjacent to the appropriate row. A second spiral coil portion is formed by winding inwardly in the direction opposite to the coil portion,
The vortex coil portions adjacent in the radial direction of the stator are formed by connecting inner peripheral side ends of the first vortex coil portion and the second vortex coil portion. Item 6. A method for manufacturing a stator winding according to Item 5.

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